swapspace-1.14/0000755000175000017500000000000013317201567010433 500000000000000swapspace-1.14/INSTALL0000644000175000017500000003661013043256437011414 00000000000000Installation Instructions ************************* Copyright (C) 1994-1996, 1999-2002, 2004-2013 Free Software Foundation, Inc. Copying and distribution of this file, with or without modification, are permitted in any medium without royalty provided the copyright notice and this notice are preserved. This file is offered as-is, without warranty of any kind. Basic Installation ================== Briefly, the shell command `./configure && make && make install' should configure, build, and install this package. The following more-detailed instructions are generic; see the `README' file for instructions specific to this package. Some packages provide this `INSTALL' file but do not implement all of the features documented below. The lack of an optional feature in a given package is not necessarily a bug. More recommendations for GNU packages can be found in *note Makefile Conventions: (standards)Makefile Conventions. The `configure' shell script attempts to guess correct values for various system-dependent variables used during compilation. It uses those values to create a `Makefile' in each directory of the package. It may also create one or more `.h' files containing system-dependent definitions. Finally, it creates a shell script `config.status' that you can run in the future to recreate the current configuration, and a file `config.log' containing compiler output (useful mainly for debugging `configure'). It can also use an optional file (typically called `config.cache' and enabled with `--cache-file=config.cache' or simply `-C') that saves the results of its tests to speed up reconfiguring. Caching is disabled by default to prevent problems with accidental use of stale cache files. If you need to do unusual things to compile the package, please try to figure out how `configure' could check whether to do them, and mail diffs or instructions to the address given in the `README' so they can be considered for the next release. If you are using the cache, and at some point `config.cache' contains results you don't want to keep, you may remove or edit it. The file `configure.ac' (or `configure.in') is used to create `configure' by a program called `autoconf'. You need `configure.ac' if you want to change it or regenerate `configure' using a newer version of `autoconf'. The simplest way to compile this package is: 1. `cd' to the directory containing the package's source code and type `./configure' to configure the package for your system. Running `configure' might take a while. While running, it prints some messages telling which features it is checking for. 2. Type `make' to compile the package. 3. Optionally, type `make check' to run any self-tests that come with the package, generally using the just-built uninstalled binaries. 4. Type `make install' to install the programs and any data files and documentation. When installing into a prefix owned by root, it is recommended that the package be configured and built as a regular user, and only the `make install' phase executed with root privileges. 5. Optionally, type `make installcheck' to repeat any self-tests, but this time using the binaries in their final installed location. This target does not install anything. Running this target as a regular user, particularly if the prior `make install' required root privileges, verifies that the installation completed correctly. 6. You can remove the program binaries and object files from the source code directory by typing `make clean'. To also remove the files that `configure' created (so you can compile the package for a different kind of computer), type `make distclean'. There is also a `make maintainer-clean' target, but that is intended mainly for the package's developers. If you use it, you may have to get all sorts of other programs in order to regenerate files that came with the distribution. 7. Often, you can also type `make uninstall' to remove the installed files again. In practice, not all packages have tested that uninstallation works correctly, even though it is required by the GNU Coding Standards. 8. Some packages, particularly those that use Automake, provide `make distcheck', which can by used by developers to test that all other targets like `make install' and `make uninstall' work correctly. This target is generally not run by end users. Compilers and Options ===================== Some systems require unusual options for compilation or linking that the `configure' script does not know about. Run `./configure --help' for details on some of the pertinent environment variables. You can give `configure' initial values for configuration parameters by setting variables in the command line or in the environment. Here is an example: ./configure CC=c99 CFLAGS=-g LIBS=-lposix *Note Defining Variables::, for more details. Compiling For Multiple Architectures ==================================== You can compile the package for more than one kind of computer at the same time, by placing the object files for each architecture in their own directory. To do this, you can use GNU `make'. `cd' to the directory where you want the object files and executables to go and run the `configure' script. `configure' automatically checks for the source code in the directory that `configure' is in and in `..'. This is known as a "VPATH" build. With a non-GNU `make', it is safer to compile the package for one architecture at a time in the source code directory. After you have installed the package for one architecture, use `make distclean' before reconfiguring for another architecture. On MacOS X 10.5 and later systems, you can create libraries and executables that work on multiple system types--known as "fat" or "universal" binaries--by specifying multiple `-arch' options to the compiler but only a single `-arch' option to the preprocessor. Like this: ./configure CC="gcc -arch i386 -arch x86_64 -arch ppc -arch ppc64" \ CXX="g++ -arch i386 -arch x86_64 -arch ppc -arch ppc64" \ CPP="gcc -E" CXXCPP="g++ -E" This is not guaranteed to produce working output in all cases, you may have to build one architecture at a time and combine the results using the `lipo' tool if you have problems. Installation Names ================== By default, `make install' installs the package's commands under `/usr/local/bin', include files under `/usr/local/include', etc. You can specify an installation prefix other than `/usr/local' by giving `configure' the option `--prefix=PREFIX', where PREFIX must be an absolute file name. You can specify separate installation prefixes for architecture-specific files and architecture-independent files. If you pass the option `--exec-prefix=PREFIX' to `configure', the package uses PREFIX as the prefix for installing programs and libraries. Documentation and other data files still use the regular prefix. In addition, if you use an unusual directory layout you can give options like `--bindir=DIR' to specify different values for particular kinds of files. Run `configure --help' for a list of the directories you can set and what kinds of files go in them. In general, the default for these options is expressed in terms of `${prefix}', so that specifying just `--prefix' will affect all of the other directory specifications that were not explicitly provided. The most portable way to affect installation locations is to pass the correct locations to `configure'; however, many packages provide one or both of the following shortcuts of passing variable assignments to the `make install' command line to change installation locations without having to reconfigure or recompile. The first method involves providing an override variable for each affected directory. For example, `make install prefix=/alternate/directory' will choose an alternate location for all directory configuration variables that were expressed in terms of `${prefix}'. Any directories that were specified during `configure', but not in terms of `${prefix}', must each be overridden at install time for the entire installation to be relocated. The approach of makefile variable overrides for each directory variable is required by the GNU Coding Standards, and ideally causes no recompilation. However, some platforms have known limitations with the semantics of shared libraries that end up requiring recompilation when using this method, particularly noticeable in packages that use GNU Libtool. The second method involves providing the `DESTDIR' variable. For example, `make install DESTDIR=/alternate/directory' will prepend `/alternate/directory' before all installation names. The approach of `DESTDIR' overrides is not required by the GNU Coding Standards, and does not work on platforms that have drive letters. On the other hand, it does better at avoiding recompilation issues, and works well even when some directory options were not specified in terms of `${prefix}' at `configure' time. Optional Features ================= If the package supports it, you can cause programs to be installed with an extra prefix or suffix on their names by giving `configure' the option `--program-prefix=PREFIX' or `--program-suffix=SUFFIX'. Some packages pay attention to `--enable-FEATURE' options to `configure', where FEATURE indicates an optional part of the package. They may also pay attention to `--with-PACKAGE' options, where PACKAGE is something like `gnu-as' or `x' (for the X Window System). The `README' should mention any `--enable-' and `--with-' options that the package recognizes. For packages that use the X Window System, `configure' can usually find the X include and library files automatically, but if it doesn't, you can use the `configure' options `--x-includes=DIR' and `--x-libraries=DIR' to specify their locations. Some packages offer the ability to configure how verbose the execution of `make' will be. For these packages, running `./configure --enable-silent-rules' sets the default to minimal output, which can be overridden with `make V=1'; while running `./configure --disable-silent-rules' sets the default to verbose, which can be overridden with `make V=0'. Particular systems ================== On HP-UX, the default C compiler is not ANSI C compatible. If GNU CC is not installed, it is recommended to use the following options in order to use an ANSI C compiler: ./configure CC="cc -Ae -D_XOPEN_SOURCE=500" and if that doesn't work, install pre-built binaries of GCC for HP-UX. HP-UX `make' updates targets which have the same time stamps as their prerequisites, which makes it generally unusable when shipped generated files such as `configure' are involved. Use GNU `make' instead. On OSF/1 a.k.a. Tru64, some versions of the default C compiler cannot parse its `' header file. The option `-nodtk' can be used as a workaround. If GNU CC is not installed, it is therefore recommended to try ./configure CC="cc" and if that doesn't work, try ./configure CC="cc -nodtk" On Solaris, don't put `/usr/ucb' early in your `PATH'. This directory contains several dysfunctional programs; working variants of these programs are available in `/usr/bin'. So, if you need `/usr/ucb' in your `PATH', put it _after_ `/usr/bin'. On Haiku, software installed for all users goes in `/boot/common', not `/usr/local'. It is recommended to use the following options: ./configure --prefix=/boot/common Specifying the System Type ========================== There may be some features `configure' cannot figure out automatically, but needs to determine by the type of machine the package will run on. Usually, assuming the package is built to be run on the _same_ architectures, `configure' can figure that out, but if it prints a message saying it cannot guess the machine type, give it the `--build=TYPE' option. TYPE can either be a short name for the system type, such as `sun4', or a canonical name which has the form: CPU-COMPANY-SYSTEM where SYSTEM can have one of these forms: OS KERNEL-OS See the file `config.sub' for the possible values of each field. If `config.sub' isn't included in this package, then this package doesn't need to know the machine type. If you are _building_ compiler tools for cross-compiling, you should use the option `--target=TYPE' to select the type of system they will produce code for. If you want to _use_ a cross compiler, that generates code for a platform different from the build platform, you should specify the "host" platform (i.e., that on which the generated programs will eventually be run) with `--host=TYPE'. Sharing Defaults ================ If you want to set default values for `configure' scripts to share, you can create a site shell script called `config.site' that gives default values for variables like `CC', `cache_file', and `prefix'. `configure' looks for `PREFIX/share/config.site' if it exists, then `PREFIX/etc/config.site' if it exists. Or, you can set the `CONFIG_SITE' environment variable to the location of the site script. A warning: not all `configure' scripts look for a site script. Defining Variables ================== Variables not defined in a site shell script can be set in the environment passed to `configure'. However, some packages may run configure again during the build, and the customized values of these variables may be lost. In order to avoid this problem, you should set them in the `configure' command line, using `VAR=value'. For example: ./configure CC=/usr/local2/bin/gcc causes the specified `gcc' to be used as the C compiler (unless it is overridden in the site shell script). Unfortunately, this technique does not work for `CONFIG_SHELL' due to an Autoconf limitation. Until the limitation is lifted, you can use this workaround: CONFIG_SHELL=/bin/bash ./configure CONFIG_SHELL=/bin/bash `configure' Invocation ====================== `configure' recognizes the following options to control how it operates. `--help' `-h' Print a summary of all of the options to `configure', and exit. `--help=short' `--help=recursive' Print a summary of the options unique to this package's `configure', and exit. The `short' variant lists options used only in the top level, while the `recursive' variant lists options also present in any nested packages. `--version' `-V' Print the version of Autoconf used to generate the `configure' script, and exit. `--cache-file=FILE' Enable the cache: use and save the results of the tests in FILE, traditionally `config.cache'. FILE defaults to `/dev/null' to disable caching. `--config-cache' `-C' Alias for `--cache-file=config.cache'. `--quiet' `--silent' `-q' Do not print messages saying which checks are being made. To suppress all normal output, redirect it to `/dev/null' (any error messages will still be shown). `--srcdir=DIR' Look for the package's source code in directory DIR. Usually `configure' can determine that directory automatically. `--prefix=DIR' Use DIR as the installation prefix. *note Installation Names:: for more details, including other options available for fine-tuning the installation locations. `--no-create' `-n' Run the configure checks, but stop before creating any output files. `configure' also accepts some other, not widely useful, options. Run `configure --help' for more details. swapspace-1.14/COPYING0000644000175000017500000004314013043256437011412 00000000000000 GNU GENERAL PUBLIC LICENSE Version 2, June 1991 Copyright (C) 1989, 1991 Free Software Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed. Preamble The licenses for most software are designed to take away your freedom to share and change it. By contrast, the GNU General Public License is intended to guarantee your freedom to share and change free software--to make sure the software is free for all its users. This General Public License applies to most of the Free Software Foundation's software and to any other program whose authors commit to using it. (Some other Free Software Foundation software is covered by the GNU Library General Public License instead.) You can apply it to your programs, too. When we speak of free software, we are referring to freedom, not price. Our General Public Licenses are designed to make sure that you have the freedom to distribute copies of free software (and charge for this service if you wish), that you receive source code or can get it if you want it, that you can change the software or use pieces of it in new free programs; and that you know you can do these things. To protect your rights, we need to make restrictions that forbid anyone to deny you these rights or to ask you to surrender the rights. These restrictions translate to certain responsibilities for you if you distribute copies of the software, or if you modify it. For example, if you distribute copies of such a program, whether gratis or for a fee, you must give the recipients all the rights that you have. You must make sure that they, too, receive or can get the source code. And you must show them these terms so they know their rights. We protect your rights with two steps: (1) copyright the software, and (2) offer you this license which gives you legal permission to copy, distribute and/or modify the software. Also, for each author's protection and ours, we want to make certain that everyone understands that there is no warranty for this free software. If the software is modified by someone else and passed on, we want its recipients to know that what they have is not the original, so that any problems introduced by others will not reflect on the original authors' reputations. Finally, any free program is threatened constantly by software patents. We wish to avoid the danger that redistributors of a free program will individually obtain patent licenses, in effect making the program proprietary. To prevent this, we have made it clear that any patent must be licensed for everyone's free use or not licensed at all. The precise terms and conditions for copying, distribution and modification follow. GNU GENERAL PUBLIC LICENSE TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION 0. This License applies to any program or other work which contains a notice placed by the copyright holder saying it may be distributed under the terms of this General Public License. The "Program", below, refers to any such program or work, and a "work based on the Program" means either the Program or any derivative work under copyright law: that is to say, a work containing the Program or a portion of it, either verbatim or with modifications and/or translated into another language. (Hereinafter, translation is included without limitation in the term "modification".) Each licensee is addressed as "you". Activities other than copying, distribution and modification are not covered by this License; they are outside its scope. The act of running the Program is not restricted, and the output from the Program is covered only if its contents constitute a work based on the Program (independent of having been made by running the Program). Whether that is true depends on what the Program does. 1. You may copy and distribute verbatim copies of the Program's source code as you receive it, in any medium, provided that you conspicuously and appropriately publish on each copy an appropriate copyright notice and disclaimer of warranty; keep intact all the notices that refer to this License and to the absence of any warranty; and give any other recipients of the Program a copy of this License along with the Program. You may charge a fee for the physical act of transferring a copy, and you may at your option offer warranty protection in exchange for a fee. 2. You may modify your copy or copies of the Program or any portion of it, thus forming a work based on the Program, and copy and distribute such modifications or work under the terms of Section 1 above, provided that you also meet all of these conditions: a) You must cause the modified files to carry prominent notices stating that you changed the files and the date of any change. b) You must cause any work that you distribute or publish, that in whole or in part contains or is derived from the Program or any part thereof, to be licensed as a whole at no charge to all third parties under the terms of this License. c) If the modified program normally reads commands interactively when run, you must cause it, when started running for such interactive use in the most ordinary way, to print or display an announcement including an appropriate copyright notice and a notice that there is no warranty (or else, saying that you provide a warranty) and that users may redistribute the program under these conditions, and telling the user how to view a copy of this License. (Exception: if the Program itself is interactive but does not normally print such an announcement, your work based on the Program is not required to print an announcement.) These requirements apply to the modified work as a whole. If identifiable sections of that work are not derived from the Program, and can be reasonably considered independent and separate works in themselves, then this License, and its terms, do not apply to those sections when you distribute them as separate works. But when you distribute the same sections as part of a whole which is a work based on the Program, the distribution of the whole must be on the terms of this License, whose permissions for other licensees extend to the entire whole, and thus to each and every part regardless of who wrote it. Thus, it is not the intent of this section to claim rights or contest your rights to work written entirely by you; rather, the intent is to exercise the right to control the distribution of derivative or collective works based on the Program. In addition, mere aggregation of another work not based on the Program with the Program (or with a work based on the Program) on a volume of a storage or distribution medium does not bring the other work under the scope of this License. 3. You may copy and distribute the Program (or a work based on it, under Section 2) in object code or executable form under the terms of Sections 1 and 2 above provided that you also do one of the following: a) Accompany it with the complete corresponding machine-readable source code, which must be distributed under the terms of Sections 1 and 2 above on a medium customarily used for software interchange; or, b) Accompany it with a written offer, valid for at least three years, to give any third party, for a charge no more than your cost of physically performing source distribution, a complete machine-readable copy of the corresponding source code, to be distributed under the terms of Sections 1 and 2 above on a medium customarily used for software interchange; or, c) Accompany it with the information you received as to the offer to distribute corresponding source code. (This alternative is allowed only for noncommercial distribution and only if you received the program in object code or executable form with such an offer, in accord with Subsection b above.) The source code for a work means the preferred form of the work for making modifications to it. For an executable work, complete source code means all the source code for all modules it contains, plus any associated interface definition files, plus the scripts used to control compilation and installation of the executable. However, as a special exception, the source code distributed need not include anything that is normally distributed (in either source or binary form) with the major components (compiler, kernel, and so on) of the operating system on which the executable runs, unless that component itself accompanies the executable. If distribution of executable or object code is made by offering access to copy from a designated place, then offering equivalent access to copy the source code from the same place counts as distribution of the source code, even though third parties are not compelled to copy the source along with the object code. 4. You may not copy, modify, sublicense, or distribute the Program except as expressly provided under this License. Any attempt otherwise to copy, modify, sublicense or distribute the Program is void, and will automatically terminate your rights under this License. However, parties who have received copies, or rights, from you under this License will not have their licenses terminated so long as such parties remain in full compliance. 5. You are not required to accept this License, since you have not signed it. However, nothing else grants you permission to modify or distribute the Program or its derivative works. These actions are prohibited by law if you do not accept this License. Therefore, by modifying or distributing the Program (or any work based on the Program), you indicate your acceptance of this License to do so, and all its terms and conditions for copying, distributing or modifying the Program or works based on it. 6. Each time you redistribute the Program (or any work based on the Program), the recipient automatically receives a license from the original licensor to copy, distribute or modify the Program subject to these terms and conditions. You may not impose any further restrictions on the recipients' exercise of the rights granted herein. You are not responsible for enforcing compliance by third parties to this License. 7. If, as a consequence of a court judgment or allegation of patent infringement or for any other reason (not limited to patent issues), conditions are imposed on you (whether by court order, agreement or otherwise) that contradict the conditions of this License, they do not excuse you from the conditions of this License. If you cannot distribute so as to satisfy simultaneously your obligations under this License and any other pertinent obligations, then as a consequence you may not distribute the Program at all. For example, if a patent license would not permit royalty-free redistribution of the Program by all those who receive copies directly or indirectly through you, then the only way you could satisfy both it and this License would be to refrain entirely from distribution of the Program. If any portion of this section is held invalid or unenforceable under any particular circumstance, the balance of the section is intended to apply and the section as a whole is intended to apply in other circumstances. It is not the purpose of this section to induce you to infringe any patents or other property right claims or to contest validity of any such claims; this section has the sole purpose of protecting the integrity of the free software distribution system, which is implemented by public license practices. Many people have made generous contributions to the wide range of software distributed through that system in reliance on consistent application of that system; it is up to the author/donor to decide if he or she is willing to distribute software through any other system and a licensee cannot impose that choice. This section is intended to make thoroughly clear what is believed to be a consequence of the rest of this License. 8. If the distribution and/or use of the Program is restricted in certain countries either by patents or by copyrighted interfaces, the original copyright holder who places the Program under this License may add an explicit geographical distribution limitation excluding those countries, so that distribution is permitted only in or among countries not thus excluded. In such case, this License incorporates the limitation as if written in the body of this License. 9. The Free Software Foundation may publish revised and/or new versions of the General Public License from time to time. Such new versions will be similar in spirit to the present version, but may differ in detail to address new problems or concerns. Each version is given a distinguishing version number. If the Program specifies a version number of this License which applies to it and "any later version", you have the option of following the terms and conditions either of that version or of any later version published by the Free Software Foundation. If the Program does not specify a version number of this License, you may choose any version ever published by the Free Software Foundation. 10. If you wish to incorporate parts of the Program into other free programs whose distribution conditions are different, write to the author to ask for permission. For software which is copyrighted by the Free Software Foundation, write to the Free Software Foundation; we sometimes make exceptions for this. Our decision will be guided by the two goals of preserving the free status of all derivatives of our free software and of promoting the sharing and reuse of software generally. NO WARRANTY 11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. END OF TERMS AND CONDITIONS How to Apply These Terms to Your New Programs If you develop a new program, and you want it to be of the greatest possible use to the public, the best way to achieve this is to make it free software which everyone can redistribute and change under these terms. To do so, attach the following notices to the program. It is safest to attach them to the start of each source file to most effectively convey the exclusion of warranty; and each file should have at least the "copyright" line and a pointer to where the full notice is found. Copyright (C) This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA Also add information on how to contact you by electronic and paper mail. If the program is interactive, make it output a short notice like this when it starts in an interactive mode: Gnomovision version 69, Copyright (C) year name of author Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. This is free software, and you are welcome to redistribute it under certain conditions; type `show c' for details. The hypothetical commands `show w' and `show c' should show the appropriate parts of the General Public License. Of course, the commands you use may be called something other than `show w' and `show c'; they could even be mouse-clicks or menu items--whatever suits your program. You should also get your employer (if you work as a programmer) or your school, if any, to sign a "copyright disclaimer" for the program, if necessary. Here is a sample; alter the names: Yoyodyne, Inc., hereby disclaims all copyright interest in the program `Gnomovision' (which makes passes at compilers) written by James Hacker. , 1 April 1989 Ty Coon, President of Vice This General Public License does not permit incorporating your program into proprietary programs. If your program is a subroutine library, you may consider it more useful to permit linking proprietary applications with the library. 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# UTC # This originates from X11R5 (mit/util/scripts/install.sh), which was # later released in X11R6 (xc/config/util/install.sh) with the # following copyright and license. # # Copyright (C) 1994 X Consortium # # Permission is hereby granted, free of charge, to any person obtaining a copy # of this software and associated documentation files (the "Software"), to # deal in the Software without restriction, including without limitation the # rights to use, copy, modify, merge, publish, distribute, sublicense, and/or # sell copies of the Software, and to permit persons to whom the Software is # furnished to do so, subject to the following conditions: # # The above copyright notice and this permission notice shall be included in # all copies or substantial portions of the Software. # # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 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Vermeulen Forked by Jacob Adams swapspace-1.14/swapspace.conf0000644000175000017500000000345713316770774013233 00000000000000# This file is part of Swapspace. # # Swapspace is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 2 of the License, or # (at your option) any later version. # # Swapspace is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with swapspace; if not, write to the Free Software # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA # Swap path: location where swapspace may create and delete swapfiles. For # security reasons this directory must be accessible to root and to root only. #swappath="/usr/local/var/lib/swapspace" # Lower free-space threshold: if the percentage of free space drops below this # number, additional swapspace is allocated #lower_freelimit=20 # Upper free-space threshold: if the percentage of free space exceeds this # number, swapspace will attempt to free up swapspace #upper_freelimit=60 # Percentage of free space swapspace should aim for when adding swapspace. This # should fall somewhere between lower_freelimit and upper_freelimit. #freetarget=30 # Smallest allowed size for individual swapfiles #min_swapsize=4m # Greatest allowed size for individual swapfiles #max_swapsize=2t # Duration (roughly in seconds) of the moratorium on swap allocation that is # instated if disk space runs out, or the cooldown time after a new swapfile is # successfully allocated before swapspace will consider deallocating swap space # again. 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Copyright (C) 2005,2006, Software Industry Industry Promotion Agency (SIPA) Copyright (C) 2010, Jeroen T. Vermeulen Written by Jeroen T. Vermeulen. Swapspace is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. Swapspace is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with swapspace; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA */ #include "env.h" #include #include #include #include #include #include #include "log.h" #include "memory.h" #include "opts.h" #include "support.h" /// Lower bound to percentage of memory/swap space kept available static int lower_freelimit=20; /// Upper bound to percentage of memory/swap space kept available static int upper_freelimit=60; /// Configuration item: target percentage of available space after adding swap static int freetarget=30; /// Configuration item: what percentage of buffer space do we consider "free"? static int buffer_elasticity=30; // TODO: Make this adaptive based on actual cache usage, to avoid thrashing? // TODO: Any way of detecting actual cache flexibility or minimum size? /// Configuration item: what percentage of cache space do we consider "free"? static int cache_elasticity=80; #ifndef NO_CONFIG char *set_freetarget(long long pct) { freetarget = (int)pct; return NULL; } char *set_lower_freelimit(long long pct) { lower_freelimit = (int)pct; return NULL; } char *set_upper_freelimit(long long pct) { upper_freelimit = (int)pct; return NULL; } char *set_buffer_elasticity(long long pct) { buffer_elasticity = (int)pct; return NULL; } char *set_cache_elasticity(long long pct) { cache_elasticity = (int)pct; return NULL; } bool memory_check_config(void) { CHECK_CONFIG_ERR(lower_freelimit > upper_freelimit); CHECK_CONFIG_ERR(freetarget < lower_freelimit); CHECK_CONFIG_ERR(freetarget > upper_freelimit); return true; } #endif struct meminfo_item { char entry[200]; memsize_t value; }; /// Read and parse next line from /proc/meminfo. Clobbers localbuf. /** Attempt to read a line from /proc/meminfo into result. If an error occurs, * result will hold errno (which may be zero, e.g. in the case of a parse error) * and a generic error string. If end-of-file has been reached or a meaningless * line has been read, result will contain zero and the empty string. * * @return success (not EOF and not error) */ static bool read_meminfo_item(FILE *fp, struct meminfo_item *result) { result->entry[0] = '\0'; result->value = 0; if (unlikely(!fgets(localbuf, sizeof(localbuf), fp))) { if (unlikely(ferror(fp))) result->value = (memsize_t)errno; if (unlikely(result->value)) strcpy(result->entry, "Error reading /proc/meminfo"); return false; } char fact[20]; const int x = sscanf(localbuf, "%[^:]: %lld %19s", result->entry, &result->value, fact); if (unlikely(x == 2)) { // Since Linux 2.6.18-mm4 or so, /proc/meminfo may contain lines without a // unit or "factor" attached. fact[0] = '\0'; } else if (unlikely(x < 2)) { result->value = 0; // In Linux 2.4, /proc/meminfo starts with a header line with leading // whitespace. We accept that as a special case. if (likely(isspace(localbuf[0]))) { result->entry[0] = '\0'; return true; } // All other parse failures are fatal. snprintf(result->entry, sizeof(result->entry), "Parse error in /proc/meminfo: '%150s'", localbuf); return false; } // Another special case for Linux 2.4: two extra lines summarize the various // pools of physical memory and swap space. We'd fail to parse these lines // (which we're not interested in anyway) because there's a number where we // expect a scale factor. Detect this and skip those lines. if (isdigit(fact[0])) { result->entry[0] = '\0'; result->value = 0; return true; } // Parse scale factor at end of line. I've never seen it be anything other // than "kB", but who knows what can happen... memsize_t scale = 0; const size_t factlen = strlen(fact); switch (factlen) { case 0: scale = 1; break; case 3: if (fact[1] != 'i') break; // FALL-THROUGH case 2: if (fact[factlen-1] != 'B') break; // FALL-THROUGH case 1: switch (tolower(fact[0])) { case 'b': scale = 1; break; case 'k': scale = KILO; break; case 'm': scale = MEGA; break; case 'g': scale = GIGA; break; } break; } if (unlikely(!scale)) { result->value = 0; snprintf(result->entry, sizeof(result->entry), "Unknown scale factor in /proc/meminfo: %s", fact); return false; } result->value *= scale; return true; } struct memstate { memsize_t MemTotal, MemFree, Buffers, Cached, Dirty, Writeback, SwapCached, SwapTotal, SwapFree, Shmem; }; void imbibe_meminfo_entry(const struct meminfo_item *inf, struct memstate *st) { switch (inf->entry[0]) { case 'B': if (strcmp(inf->entry, "Buffers")==0) st->Buffers = inf->value; break; case 'C': if (strcmp(inf->entry, "Cached")==0) st->Cached = inf->value; break; case 'D': if (strcmp(inf->entry, "Dirty")==0) st->Dirty = inf->value; break; case 'M': if (strncmp(inf->entry,"Mem",3) == 0) { if (strcmp(inf->entry+3, "Total")==0) st->MemTotal = inf->value; else if (strcmp(inf->entry+3, "Free")==0) st->MemFree = inf->value; } break; case 'S': if (strncmp(inf->entry,"Swap",4) == 0) { if (strcmp(inf->entry+4, "Total")==0) st->SwapTotal = inf->value; else if (strcmp(inf->entry+4, "Free")==0) st->SwapFree = inf->value; else if (strcmp(inf->entry+4, "Cached")==0) st->SwapCached = inf->value; } if (strcmp(inf->entry,"Shmem")==0) st->Shmem = inf->value; break; case 'W': if (strcmp(inf->entry,"Writeback")==0) st->Writeback = inf->value; break; } } static bool read_proc_meminfo(struct memstate *s) { FILE *fp = fopen("/proc/meminfo", "r"); if (unlikely(!fp)) { log_perr(LOG_ERR, "Could not open /proc/meminfo for reading", errno); return false; } struct meminfo_item inf; while (read_meminfo_item(fp, &inf)) imbibe_meminfo_entry(&inf, s); fclose(fp); if (unlikely(inf.entry[0])) { log_perr(LOG_ERR, inf.entry, inf.value); return false; } if (unlikely(!s->MemTotal)) { logm(LOG_ERR, "No memory detected! Perhaps /proc/meminfo is in an unexpected format"); return false; } if (unlikely(s->MemTotal < s->MemFree+s->Buffers+s->Cached+s->SwapCached)) { logm(LOG_ERR, "Memory statistics read from /proc/meminfo don't add up"); return false; } return true; } bool check_memory_status(void) { const memsize_t init_req = memory_target(); if (unlikely(init_req == MEMSIZE_ERROR)) return false; #ifndef NO_CONFIG if (init_req && !quiet) { printf("Initial memory status: "); if (init_req > 0) logm(LOG_INFO, "would prefer %lld extra bytes", init_req); else logm(LOG_INFO, "%lld bytes to spare", -init_req); } #endif return true; } /// How much buffer space can we expect the system to free up? static inline memsize_t buffers_free(const struct memstate *st) { return (st->Buffers/100) * buffer_elasticity; } /// How much cache space can we expect the system to free up? static inline memsize_t cache_free(const struct memstate *st) { const memsize_t cache = st->Cached - (st->Dirty + st->Writeback + st->Shmem); return (cache > 0) ? (cache/100)*cache_elasticity : 0; } static inline memsize_t space_free(const struct memstate *st) { /* Estimating "free" memory is not only hard, but subjective as well. Ideally * we'd want some measure of "pressure"--which we don't seem to have. * * The big question is what to do about Cached. This is where most bytes tend * to go, and it grows unless and until memory requirements get really, really * urgent. In other words, it doesn't behave as if it's something very * flexible that we could treat as essentially "free" space. * * What if we subtracted Dirty and Writeback from this number? Writeback * appears to be a very rare state, but Dirty can get quite large when the * system is pressed for memory. Would the remainder be more or less * flexible? For some reason I get more flexibility now, even without having * a noticeable number of dirty pages, on a 2.6.10 kernel than I observed in * the past. Has something changed here? * * I managed to push back Cached all the way to about half a percent of total * physical memory before the system started to thrash. And that was with a * large number of applications loaded and large amounts of memory allocated * and committed by applications. * * Under these circumstances, best thing to do is subtract Dirty/Writeback * from Cached and "discount" the remainder against a new parameter ("Cache * Pressure") which says how much of the non-dirty part of Cache should be * considered in-use. */ return st->MemFree + st->SwapFree + st->SwapCached + buffers_free(st) + cache_free(st); } static inline memsize_t space_total(const struct memstate *st) { return st->MemTotal + st->SwapTotal; } static inline int pct_free(const struct memstate *st) { // Phrased oddly to avoid integer overflows return space_free(st)/(space_total(st)/100); } static memsize_t ideal_swapsize(memsize_t totalspace, memsize_t freespace) { /* This is phrased rather oddly, and a fairly high rounding error is * introduced. * * The reason is to avoid overflows in the computation: we effectively compute * at a granularity of 100 bytes to avoid overflows, then multiply by 100 * again to get back to an approximation of our original number. * * This might conceivably be a problem if freetarget is ridiculously close to * either freespace threshold. * * We try to find the ideal allocation size x>0 such that if we add x free * bytes (i.e. we add it to both freespace and totalspace), we end up at * exactly our freetarget. In mathematical terms, i.e. without caring about * rounding or overflows: * * (freespace+x)/(totalspace+x) = freetarget/100 <=> * freespace+x = freetarget*(totalspace+x)/100 <=> * 100*(freespace+x)/freetarget = totalspace+x <=> * 100*freespace/freetarget+100*x/freetarget = totalspace+x <=> * 100*freespace/freetarget-totalspace = x - 100*x/freetarget <=> * x-100*x/freetarget = 100*freespace/freetarget - totalspace <=> * x*(1-100/freetarget) = 100*freespace/freetarget - totalspace <=> * * x = (100*freespace/freetarget - totalspace) / (1 - 100/freetarget) * = (100*freespace - freetarget*totalspace) / (freetarget - 100) * * This latter expression we convert to an overflow-free form by dividing both * freespace and totalspace by some constant p, and multiplying by this same p * afterwards: * * x/p = (100*freespace/p - freetarget*totalspace/p) / (freetarget-100) * * The natural choice for p is 100, since it gives up the exact minimum * precision while ensuring that both 100*freespace/p and (given that * freetarget<100) freetarget*totalspace/p remain within the range of * representable numbers, assuming that freespace and totalspace were * themselves representable to begin with. * * For p==100 we get: * * x/100 = (100*freespace/100-freetarget*totalspace/100) / (freetarget-100) * = (freespace - freetarget*totalspace/100) / (freetarget-100) * * Note that one of the two divisions by p has disappeared. To recover as * much of that lost precision of the remaining division-by-p, we round to the * nearest integer, not downwards: */ return 100 * ((freespace-freetarget*((totalspace+50)/100))/(freetarget-100)); } memsize_t memory_target(void) { /* Determining how much memory we need is a pretty difficult job. One reason * is that if no swap space is available under Linux 2.6, lots of pages stay * marked as "cached." So when /proc/meminfo says that a large portion of * physical memory is in use as cache, that doesn't mean that memory can be * made available for other uses! */ assert(upper_freelimit > lower_freelimit); struct memstate st = { 0, 0, 0, 0, 0, 0, 0, 0 }; if (unlikely(!read_proc_meminfo(&st))) return MEMSIZE_ERROR; const int freepct = pct_free(&st); memsize_t request = 0; // Policy: once we hit either freelimit, steer for "freetarget"% free space // TODO: Use /proc/sys/vm/min_free_kbytes when no swap yet allocated? if (freepct < lower_freelimit || freepct > upper_freelimit) request = ideal_swapsize(space_total(&st), space_free(&st)); return request; } memsize_t minimal_swapfile(void) { struct memstate st = { 0, 0, 0, 0, 0, 0, 0, 0 }; if (unlikely(!read_proc_meminfo(&st))) return MEMSIZE_ERROR; const memsize_t total = space_total(&st); // Compute desired swapfile size if we're exactly at lower_freelimit return ideal_swapsize(total, (total/100)*lower_freelimit); } static void dump_memline(const char category[], long long total, long long free, long long cached) { logm(LOG_INFO, "%s: %lld total, %lld free (%lld used); %lld cached", category, total, free, (total - free), cached); } void dump_memory(void) { struct memstate st = { 0, 0, 0, 0, 0, 0, 0, 0 }; if (unlikely(!read_proc_meminfo(&st))) return; check_memory_status(); dump_memline("core", st.MemTotal, st.MemFree, st.Cached); dump_memline("swap", st.SwapTotal, st.SwapFree, st.SwapCached); dump_memline("total", space_total(&st), st.MemFree + st.SwapFree, st.Cached + st.SwapCached); logm(LOG_INFO, "bufs: %lld, dirty: %lld, writeback: %lld", st.Buffers, st.Dirty, st.Writeback); const int pf = pct_free(&st); logm(LOG_INFO, "estimate free: %lld cache, %lld bufs, %lld total (%d%%)", cache_free(&st), buffers_free(&st), space_free(&st), pf); logm(LOG_INFO, "thresholds: %d%% < %d%% < %d%%", lower_freelimit, pf, upper_freelimit); } swapspace-1.14/src/Makefile.in0000644000175000017500000004470413317201565013216 00000000000000# Makefile.in generated by automake 1.15.1 from Makefile.am. # @configure_input@ # Copyright (C) 1994-2017 Free Software Foundation, Inc. # This Makefile.in is free software; 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Copyright (C) 2005,2006, Software Industry Industry Promotion Agency (SIPA) Written by Jeroen T. Vermeulen . Swapspace is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. Swapspace is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with swapspace; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA */ #ifndef SWAPSPACE_MAIN_H #define SWAPSPACE_MAIN_H #include /// I thought C99 had this built in... Maybe I'm doing something wrong. typedef int bool; enum { false=0, true=1 }; #define KILO (1024LL) #define MEGA (KILO*KILO) #define GIGA (KILO*MEGA) #define TERA (KILO*GIGA) /// Reusable local buffer space /** Can be used for composing command lines or error messages, and other * function-local temporary storage. This is not pretty, but the program must * get its work done under low-memory conditions. Avoiding dynamic memory * allocation (and even wild fluctuations in stack use) may really matter here. * * Size is best kept to an even multiple of page size, and is guaranteed to be * no less than one page in size. */ extern char localbuf[16384]; /// Timestamp counter extern time_t runclock; /// Is the swapdir on a filesystem large enough for useful swap files? /** Also prints a warning if the filesystem is large enough, but does not have * sufficient free space (but does not fail in that case). */ bool swapfs_large_enough(void); #ifndef NO_CONFIG /// Suppress informational output and warnings? extern bool quiet; /// Print debug output when changing state and such? extern bool verbose; /// Use file zeroing or posix_fallocate? extern bool zero; char *set_quiet(long long dummy); char *set_verbose(long long dummy); bool main_check_config(void); #endif char *set_daemon(long long dummy); char *set_pidfile(long long dummy); char *set_erase(long long dummy); #endif swapspace-1.14/src/state.h0000644000175000017500000000232113043256437012433 00000000000000/* This file is part of Swapspace. Copyright (C) 2005,2006, Software Industry Industry Promotion Agency (SIPA) Copyright (C) 2010, Jeroen T. Vermeulen Written by Jeroen T. Vermeulen. Swapspace is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. Swapspace is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with swapspace; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA */ #ifndef SWAPSPACE_STATE_H #define SWAPSPACE_STATE_H /// Perform one iteration of the allocation algorithm. Clobbers localbuf. void handle_requirements(void); /// Log state information. Clubbers localbuf. void dump_state(void); /// Request a transition to "diet" state void request_diet(void); #ifndef NO_CONFIG char *set_cooldown(long long duration); #endif #endif swapspace-1.14/src/log.c0000644000175000017500000000531513043256437012075 00000000000000/* This file is part of Swapspace. Copyright (C) 2005,2006, Software Industry Industry Promotion Agency (SIPA) Written by Jeroen T. Vermeulen . Swapspace is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. Swapspace is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with swapspace; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA */ #include #include #include #include #include "log.h" static bool logging = false; #ifndef LOG_PERROR /// If available (and nonzero), causes log output to be echoed to stderr #define LOG_PERROR 0 #endif void log_start(const char myname[]) { if (!logging) { openlog(myname, LOG_PERROR, LOG_DAEMON); logging = true; } } /// Stop logging, e.g. because storage containing log name goes out of scope void log_close() { closelog(); logging = false; } static const char *prefix(int priority) { switch (priority) { case LOG_ERR: return "Error: "; case LOG_WARNING: return "Warning: "; case LOG_NOTICE: return "Notice: "; } return ""; } static FILE *stream(int priority) { switch (priority) { case LOG_ERR: case LOG_WARNING: return stderr; } return stdout; } static void vlog(int priority, const char fmt[], va_list ap) { if (logging) { vsyslog(priority, fmt, ap); } else { FILE *const out = stream(priority); fprintf(out, "%s", prefix(priority)); vfprintf(out, fmt, ap); fprintf(out, "\n"); } } void logm(int priority, const char fmt[], ...) { va_list ap; va_start(ap, fmt); vlog(priority, fmt, ap); va_end(ap); } void log_perr(int priority, const char msg[], int fault_errno) { if (!fault_errno) logm(priority, "%s", msg); else logm(priority, "%s: %s", msg, strerror(fault_errno)); } void log_perr_str(int priority, const char msg[], const char arg[], int err) { if (!err) logm(priority, "%s '%s'", msg, arg); else logm(priority, "%s '%s': %s", msg, arg, strerror(err)); } #ifndef NO_CONFIG void log_discrep(int priority, const char msg[], int swapfile, memsize_t expected, memsize_t found) { logm(priority, "Discrepancy in swapfile %d: %s (%lld bytes vs. %lld)", swapfile, msg, (long long)expected, (long long)found); } #endif swapspace-1.14/src/support.c0000644000175000017500000000304613043256437013027 00000000000000/* This file is part of Swapspace. Copyright (C) 2005,2006, Software Industry Industry Promotion Agency (SIPA) Copyright (C) 2010, Jeroen T. Vermeulen Written by Jeroen T. Vermeulen. Swapspace is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. Swapspace is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with swapspace; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA */ #include "env.h" #include #include #include #include "main.h" #include "support.h" #ifndef HAVE_SWAPON /// Replacement function for system function. Clobbers localbuf. int swapon(const char path[], int flags) { return runcommand("/sbin/swapon", path); } #endif #ifndef HAVE_SWAPOFF /// Replacement function for system function. Clobbers localbuf. int swapoff(const char path[]) { return runcommand("/sbin/swapoff", path); } #endif int runcommand(const char cmd[], const char arg[]) { const size_t bufsz = sizeof(localbuf); if (unlikely(snprintf(localbuf, bufsz, "%s '%s'", cmd, arg) >= bufsz)) { errno = E2BIG; return -1; } return system(localbuf); } swapspace-1.14/src/swaps.h0000644000175000017500000000534613043256437012462 00000000000000/* This file is part of Swapspace. Copyright (C) 2005,2006, Software Industry Industry Promotion Agency (SIPA) Copyright (C) 2010, Jeroen T. Vermeulen Written by Jeroen T. Vermeulen. Swapspace is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. Swapspace is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with swapspace; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA */ #ifndef SWAPSPACE_SWAPS_H #define SWAPSPACE_SWAPS_H #include "memory.h" /// Dump statistics to stdout void dump_stats(void); /// Read /proc/swaps and set up swapfiles[] accordingly. Clobbers localbuf. /** * @return whether this succeeded */ bool read_proc_swaps(void); /// Was /proc/swaps in the expected format? /** This assumes that read_proc_swaps() has been called successfully at least * once. If no swaps were active during any of those calls, /proc/swaps may * have been completely empty so we cannot verify that the header line conforms * to the expected format. */ bool proc_swaps_parsed(void); /// Scan for pre-existing swapfiles in the current directory, and activate them /** Read /proc/swaps once before doing this, to ensure that we don't attempt to * re-enable any swapfiles that are already active (which shouldn't normally be * possible, but abnormal situations do occur sometimes). * * @return true unless a fatal error occurred */ bool activate_old_swaps(void); /// Create a new swapfile. Clobbers localbuf. /** * @param size number of bytes to allocate * @return success */ bool alloc_swapfile(memsize_t size); /// Free swap space /** * @param maxsize maximum amount of memory that may be freed */ void free_swapfile(memsize_t maxsize); /// Attempt to get rid of all our swapfiles right now bool retire_all(void); /// Total space on swap directory's filesystem memsize_t swapfs_size(void); /// Amount of free space on swap directory's filesystem memsize_t swapfs_free(void); #ifndef NO_CONFIG /// Try to guard against attacker getting unguarded access to the disk? extern bool paranoid; char *set_min_swapsize(long long size); char *set_max_swapsize(long long size); char *set_swappath(long long dummy); char *set_paranoid(long long dummy); /// Verify configuration for swaps module; cd into swappath bool swaps_check_config(void); #endif bool to_swapdir(void); #endif swapspace-1.14/src/main.c0000644000175000017500000004014713043256437012242 00000000000000/* This file is part of Swapspace. Copyright (C) 2005,2006, Software Industry Industry Promotion Agency (SIPA) Copyright (C) 2010, Jeroen T. Vermeulen Written by Jeroen T. Vermeulen. Swapspace is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. Swapspace is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with swapspace; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA */ #include "env.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include "config.h" #include "log.h" #include "main.h" #include "memory.h" #include "opts.h" #include "state.h" #include "support.h" #include "swaps.h" char localbuf[16384]; time_t runclock = 0; /// Have we received a kill/HUP/power signal? static volatile bool stop = false; static char pidfile[PATH_MAX] = "/var/run/swapspace.pid"; static bool make_pidfile = false; static bool have_pidfile = false; static int pidfd = -1; char *set_pidfile(long long dummy) { make_pidfile = true; return pidfile; } #ifndef NO_CONFIG static bool godaemon = false; char *set_daemon(long long dummy) { godaemon = true; return NULL; } bool quiet = false; bool verbose = false; char *set_quiet(long long dummy) { quiet = true; return NULL; } char *set_verbose(long long dummy) { verbose = true; return NULL; } bool main_check_config(void) { CHECK_CONFIG_ERR(quiet & verbose); return true; } #else #define godaemon true #endif static bool erase = false; char *set_erase(long long dummy) { erase = true; return NULL; } static void rmpidfile(void) { if (have_pidfile) { unlink(pidfile); have_pidfile = false; } } /// Write our process identifier to pid file. Clobbers localbuf. static bool writepid(pid_t pid) { snprintf(localbuf, sizeof(localbuf), "%d\n", pid); const size_t len = strlen(localbuf); if (unlikely(write(pidfd, localbuf, len) < len)) { log_perr_str(LOG_ERR, "Could not write pidfile", pidfile, errno); return false; } return true; } /// Create pidfile, if requested /** This is implemented separately from finishpidfile() to allow errors to be * reported to stderr before we fork off a daemon process. * * @return Success (which is trivially achieved if no pidfile is requested) */ static bool startpidfile(void) { assert(pidfd == -1); if (!make_pidfile) return true; pidfd = open(pidfile, O_WRONLY|O_CREAT|O_EXCL, O_WRONLY); if (unlikely(pidfd == -1)) { if (errno == EEXIST) logm(LOG_ERR, "Daemon already running, or leftover pidfile: '%s'", pidfile); else log_perr_str(LOG_ERR, "Could not create pidfile", pidfile, errno); return false; } have_pidfile = true; // Write temporary process id to pidfile; have to do this again if we fork() return writepid(getpid()); } /// Signal handler that requests clean exit /** Unix IPC sucks. * * It's all very powerful and flexible, but the primitives are too many and * vastly overweight. One-size-fits-all can be very useful, but in the case of * signals it also causes a lot of problems. We can be interrupted at any * moment, so we really can't assume anything about the current state of the * program--yet the compiler has to optimize with one hand tied behind its back * because it must respect sequence points no matter when the signal comes in. * Our programs could be running much faster than they are, if only the compiler * weren't obliged to assume that signal handlers may interact with the program * and keep even non-volatile variables synchronized for this purpose. * * This helped kill the Alpha architecture, by the way. The Alpha AXP was a * beautiful, clean 64-bit RISC processor family designed by DEC (the Digital * Equipment Corporation, later acquired by Compaq, which in turn was later * acquired by HP) that was almost endian-neutral because it simply didn't have * single-byte or 16-bit memory accesses. Everything went to and from memory in * larger chunks, so ECC checking could be moved off the motherboard and into * the processor itself; loops over text and such could be vectorized to read * and write entire 64-bit registers, i.e. 8 bytes at a time. Both of these * ideas were expected to make a huge difference, since memory traffic is the * most stringent system performance bottleneck today. But it didn't work out, * and the 8-bit and 16-bit load/store instructions were eventually added to the * architecture, increasing performance on the order of 20%. * * One reason for the change was that device drivers sometimes needed 8-bit or * 16-bit memory-mapped hardware accesses. Windows NT introduced wrapper macros * for such accesses that enabled an MMU-based workaround on Alpha systems. But * since these macros were no-ops on Intel x86-compatible processors, device * driver writers often failed to use them. If Linux had hit the big time a bit * earlier, DEC might have survived. * * The other reason why these instructions were added were signal handlers. The * idea of vectorizing common loops was great; it was a precursor to today's * generation of vector instruction set extensions (first SPARC's VIS, later * Intel's MMX and PowerPC's Altivec/VMX). It got such great performance that * compiler engineers at Intel wouldn't stop programming until they could do the * same trick. Alpha was so fast at the time that it outran the top-of-the-line * Pentium Pro on the still-popular SPECint92 benchmarks... even while emulating * the x86 version of the code! Intel finally thought they nailed the problem, * until Motorola engineers discovered a bug in the generated code: a vital loop * was vectorized so it did multiple iterations at a time, but it no longer * looped. The affected benchmark was giving the correct answers through sheer * coincidence. It turned out this mistake had inflated their compound * performance rating for the entire SPECint suite by an embarassing 15%. * * Unfortunately, DEC's compiler engineers found that they could not use their * aggressive optimizations in real life. The compiler never knows when a * signal is going to arrive, and yet it must synchronize the in-memory state of * most variables when it happens. Which means practically all of the time! * This perhaps goes some way towards explaining that 20% performance benefit of * adding the extra load/store instructions: the optimizations that would have * made them unnecessary could be stunningly effective--but they could almost * never be used because they might break signal handling! * * Yet despite all the conservative compiler care in the world it remains * terribly hard and complex to avoid serious bugs in signal handlers: you may * be logging to an output sink that isn't quite ready for use yet, or has just * been closed, or was just doing something else. You may want to change a * variable that the main process was changing at the same time. It's got all * the problems of multithreading, but without the aid of synchronization * primitives (okay, so you get race conditions in place of deadlocks). * * Now that we're here, feel free to build your own lightweight mechanism on top * of this that does something actually useful! * * All we really want is to set a flag saying "an exit was requested." We don't * even need to know when, how many times, or by whom. A modern kernel would * provide a primitive for just that, and build signal functionality on top of * it--not to mention select() and poll() and such. * * Look at the Amiga OS for a shining example: * - A "signal" is just a bit in the process descriptor that can be set * atomically by another process, the process itself, or even an interrupt * handler. As with Unix select(), a process can atomically retrieve and * clear any set of incoming signals, optionally sleeping first if nothing in * the set has arrived yet. Delivery is asynchronous. * - All interrupt handling is done in the "bottom half;" signals are efficient * enough to guarantee that the handler is woken up in time. The decision to * reschedule the signaled process is a simple matter of comparing the signal * to a sleep mask. * - Other forms of IPC build on top of the signal interface, using it to flag * message arrival and such. But many basic forms of event notification, * such as a timer going off, or modification of a watched file, require only * that simple single-bit signal. * - Unix-style signal handlers can be registered as "exceptions." These are * all managed in terms of signal masks. As it turned out this was not what * anybody actually wanted; it was documented in the late 1980's but not * properly implemented until 1992 because nobody ever tried to use it for * anything anyway. Or nobody apart from a Unix emulation library, perhaps. * Everybody else just uses the single bit for communication and does the * rest of the work in the event loop. * - The graphical subsystem communicates with applications through these * lightweight mechanisms, allowing a single process to provide effectively * hard-realtime GUI responsiveness even while the application is busy. You * want to resize a window? If the owner doesn't signal its willingness to * repaint within 15 milliseconds, the system lets you know it's not going to * happen. You click a button while the application doesn't have time for * you? Either it's set up to send a signal, which will happen on cue, or it * will "feel dead" from the start and it won't suddenly wake up and "become * clicked" later. You select a different radio button or move the mouse * into a sensitive region? The application isn't even woken up unless it * registered an interest. It's all stunningly efficient. * * Instead, we need the system to schedule and/or interrupt our process, mask * the signal and jump through hoops to deal with various types of other * signals that may come in before we're finished handling this one, interrupt * any system call that we may be in (which must of course be able to deal with * this correctly), save execution context on the stack, invoke our handler * function (making the signal number available to us just in case we're * interested, which we're not), note completion of the handler, check for and * deal with any other incoming signals, unmask our signal and restore normal * running state, and return our process to where it was when it all happened. * The program pays the cost of expecting that any system call may return * unexpectedly with an error code of "oops, a signal arrived." * * And all this just so we can write one lousy Boolean to memory. One single * stinking bit. */ static void sighand_exit(int sig) { stop = true; } /// Write process id to pidfile if requested, and close it. Clobbers localbuf. /** * @return Success (which is trivially achieved if no pidfile is requested) */ static void finishpidfile(void) { if (likely(make_pidfile)) { atexit(rmpidfile); close(pidfd); } } static pid_t daemonize(void) { const pid_t result = fork(); if (unlikely(result < 0)) perror("Could not fork off daemon process"); else if (result == 0) setsid(); return result; } /// Was a dump of statistics requested? static volatile bool print_status=false; /// Was an immediate adjustment requested? static volatile bool adjust_swap=false; /// Signal handler that requests generation of a status report to stdout static void sighand_status(int sig) { print_status = true; } /// Signal handler that initiates immediate swapspace adjustment static void sighand_diet(int sig) { adjust_swap = true; } static void install_sighandler(int signum, void (*handler)(int)) { struct sigaction sa; memset(&sa, 0, sizeof(sa)); sa.sa_handler = handler; sigaction(signum, &sa, NULL); } /// Install signal handlers static void install_sigs(void) { #ifdef SIGXFSZ // Some systems may send signal if our swapfiles get too large, but we have // our own ways of dealing with that eventuality. Ignore the signal. signal(SIGXFSZ, SIG_IGN); #endif // Install exit handler. These may not be repeatable, i.e. if the same signal // comes in again, we will probably just be terminated. But that's not // unreasonable, come to think of it. signal(SIGTERM, sighand_exit); signal(SIGHUP, sighand_exit); #ifdef SIGPWR signal(SIGPWR, sighand_exit); #endif // These handlers must be repeatable. install_sighandler(SIGUSR1, sighand_status); install_sighandler(SIGUSR2, sighand_diet); } bool swapfs_large_enough(void) { const memsize_t minswapfile = minimal_swapfile(); if (minswapfile == MEMSIZE_ERROR) return false; if (swapfs_size() < minswapfile) { logm(LOG_CRIT, "The filesystem holding swapspace's swap directory isn't big enough " "to hold useful swapfiles."); logm(LOG_CRIT, "Please try to expand this partition or relocate it to a larger one, " "if possible; or if all else fails, choose a different swap directory " "in your swapspace configuration."); return false; } if (swapfs_free() < minswapfile) logm(LOG_WARNING, "Not enough free space on swap directory. As things stand now, " "swapspace will not be able to create swap files."); return true; } int main(int argc, char *argv[]) { assert(sizeof(localbuf) >= getpagesize()); close(STDIN_FILENO); setlocale(LC_ALL, "C"); if (!configure(argc, argv)) return EXIT_FAILURE; if (unlikely(!read_proc_swaps()) || unlikely(!activate_old_swaps()) || unlikely(!check_memory_status())) return EXIT_FAILURE; if (erase) return retire_all() ? EXIT_SUCCESS : EXIT_FAILURE; install_sigs(); if (unlikely(!startpidfile())) return EXIT_FAILURE; /* Do a first iteration here so we can report any startup errors, and if we're * going to run as a daemon, we can do so in a steady state. */ handle_requirements(); /* If we're going to fork(), this is the last chance to read /proc/swaps in a * nonempty state before we do so. Make one last attempt to check its format. */ if (!proc_swaps_parsed()) { if (!read_proc_swaps()) return EXIT_FAILURE; #ifndef NO_CONFIG if (!quiet && !proc_swaps_parsed()) fputs("[/proc/swaps is empty, so cannot check its format]\n", stderr); #endif } if (godaemon) { #ifndef NO_CONFIG if (verbose) logm(LOG_DEBUG, "daemonizing..."); #endif const pid_t pid = daemonize(); if (unlikely(pid < 0)) { rmpidfile(); return EXIT_FAILURE; } if (pid > 0) { /* New process, so new pid. Parent process rewrites pidfile. We do this * from the parent, not the child process so that we're sure that the * pidfile is in a stable state when the parent exits. */ lseek(pidfd, 0, SEEK_SET); #ifndef NO_CONFIG if (verbose) logm(LOG_DEBUG, "got process id %d", pid); #endif return writepid(pid) ? EXIT_SUCCESS : EXIT_FAILURE; } } finishpidfile(); if (godaemon) { close(STDERR_FILENO); close(STDOUT_FILENO); // From here on std output is pointless in daemon mode. Use syslog instead. log_start(argv[0]); } // Central loop for (++runclock; !stop; ++runclock) { if (unlikely(print_status)) print_status = false, dump_stats(); else if (unlikely(adjust_swap)) adjust_swap = false, request_diet(); else handle_requirements(); sleep(1); } int result = EXIT_SUCCESS; #ifndef NO_CONFIG /* If we're worried about attackers getting unguarded access to the disk, we * need to retire and erase all swap files to keep them secret. */ if (paranoid && !retire_all()) result = EXIT_FAILURE; #endif rmpidfile(); log_close(); return result; } swapspace-1.14/src/hog.c0000644000175000017500000000441413043256437012070 00000000000000/* This file is part of Swapspace. Copyright (C) 2005,2006, Software Industry Industry Promotion Agency (SIPA) Written by Jeroen T. Vermeulen . Swapspace is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. Swapspace is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with swapspace; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA */ #include #include #include #include // Memory hog program. Allocates amount requested on the command line (in // megabytes) and keeps it, or if no argument is given, reads standard input and // tries to follow the amounts requested there. static void usage(const char name[]) { fprintf(stderr, "Usage: %s [megabytes]\n", name); } void gimme(unsigned long megs) { static char *ptr = NULL; static size_t oldsize = 0; const size_t bytes = megs*1024*1024; printf("Allocating %lu MB: ", megs); fflush(NULL); ptr = realloc(ptr, bytes); if (!ptr) { printf("Failed!\n"); exit(EXIT_FAILURE); } if (bytes > oldsize) memset(ptr+oldsize, '#', bytes-oldsize); oldsize = bytes; printf("0x%lx bytes\n", (unsigned long)bytes); } static int loop(void) { char buf[1000]; while (fgets(buf, sizeof(buf), stdin)) { const size_t target = strtoul(buf, NULL, 0); if (target) gimme(target); } return EXIT_SUCCESS; } int main(int argc, char *argv[]) { unsigned long target; switch (argc) { case 1: puts("Just keep entering how much memory you'd like, in megabytes:"); return loop(); case 2: target = strtoul(argv[1], NULL, 0); if (!target) { usage(argv[0]); return EXIT_FAILURE; } gimme(target); sleep(3600); puts("Timing out"); return EXIT_SUCCESS; default: usage(argv[0]); return EXIT_FAILURE; } return EXIT_SUCCESS; } swapspace-1.14/src/opts.c0000644000175000017500000003305213317171577012305 00000000000000/* This file is part of Swapspace. Copyright (C) 2005,2006, Software Industry Industry Promotion Agency (SIPA) Copyright (C) 2010, Jeroen T. Vermeulen Written by Jeroen T. Vermeulen. Swapspace is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. Swapspace is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with swapspace; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA */ #include "env.h" #include #include #include #include #include #include #include #include #include "memory.h" #include "opts.h" #include "support.h" #include "state.h" #include "swaps.h" static const char copyright[] = "\n" "Copyright (c) 2004-2006 Software Industry Promotion Agency of Thailand\n" "Copyright (c) 2010 Jeroen T. Vermeulen\n" "Written by Jeroen T. Vermeulen\n" "This program is free software, and is available for use under the GNU\n" "General Public License (GPL).\n" "See http://pqxx.org/development/swapspace\n" "This is a fork of the original project by Jacob Adams hosted at:\n" "https://github.com/Tookmund/swapspace\n"; #ifndef NO_CONFIG static char configfile[PATH_MAX] = ETCPREFIX"/etc/swapspace.conf"; static char *set_configfile(long long dummy) { return configfile; } static char *set_help(long long dummy); static char *set_version(long long dummy); static bool inspect = false; static char *set_inspect(long long dummy) { inspect = true; return NULL; } bool zero = false; static char *set_zero(long long dummy) { zero = true; return NULL; } enum argtype { at_none, at_num, at_str }; struct option { const char *name; char shortopt; enum argtype argtype; /// Minimum value for integer option, or for string, whether arg is required long long min; /// Maximum value for integer option, or for string, maximum length long long max; char *(*setter)(long long value); const char *desc; }; /// Available options, sorted alphabetically by long option name static const struct option options[] = { { "buffer_elasticity",'B', at_num, 0, 100, set_buffer_elasticity, "Consider n% of buffer memory to be \"available\"" }, { "cache_elasticity", 'C', at_num, 0, 100, set_cache_elasticity, "Consider n% of cache memory to be \"available\"" }, { "configfile", 'c', at_str, 1, PATH_MAX, set_configfile, "Use configuration file s" }, { "cooldown", 'a', at_num, 0, LONG_MAX, set_cooldown, "Give allocation attempts n seconds to settle" }, { "daemon", 'd', at_none, 0, 0, set_daemon, "Run quietly in background" }, { "erase", 'e', at_none, 0, 0, set_erase, "Try to free up all swapfiles, then exit" }, { "freetarget", 'f', at_num, 2, 99, set_freetarget, "Aim for n% of available space" }, { "help", 'h', at_none, 0, 0, set_help, "Display usage information" }, { "inspect", 'i', at_none, 0, 0, set_inspect, "Verify that configuration is okay, then exit" }, { "lower_freelimit", 'l', at_num, 0, 99, set_lower_freelimit, "Try to keep at least n% of memory/swap available" }, { "max_swapsize", 'M', at_num, 8192, LLONG_MAX, set_max_swapsize, "Restrict swapfiles to n bytes" }, { "min_swapsize", 'm', at_num, 8192, LLONG_MAX, set_min_swapsize, "Don't create swapfiles smaller than n bytes" }, { "paranoid", 'P', at_none, 0, 0, set_paranoid, "Wipe disk space occupied swapfiles after use" }, { "pidfile", 'p', at_str, 0, PATH_MAX, set_pidfile, "Write process identifier to file s" }, { "quiet", 'q', at_none, 0, 0, set_quiet, "Suppress informational output" }, { "swappath", 's', at_str, 1, PATH_MAX, set_swappath, "Create swapfiles in secure directory s" }, { "upper_freelimit", 'u', at_num, 0, 100, set_upper_freelimit, "Reduce swapspace if more than n% is free" }, { "verbose", 'v', at_none, 0, 0, set_verbose, "Print lots of debug information" }, { "version", 'V', at_none, 0, 0, set_version, "Print version number and exit" }, { "zero", 'z', at_none, 0, 0, set_zero, "Force swapfile allocation by manually filling with zeros" } }; static int optcmp(const void *o1, const void *o2) { return strcmp(((const struct option *)o1)->name, ((const struct option *)o2)->name); } #ifndef NO_DEBUG static bool options_okay(void) { static const int num_opts = sizeof(options)/sizeof(*options); for (int i=0; i= 127) { fprintf(stderr, "Shortopt for option %d out of range\n", i); return false; } if (options[i].min > options[i].max) { fprintf(stderr,"Minimum for %s exceeds maximum\n", options[i].name); return false; } if (!options[i].setter) { fprintf(stderr,"No setter defined for option %s\n",options[i].name); return false; } } localbuf[(unsigned char)options[0].shortopt] = true; for (int i=1; i= 0) { fprintf(stderr, "Options array not sorted (%s >= %s)\n", options[i-1].name, options[i].name); return false; } if (localbuf[(unsigned char)options[i].shortopt]) { fprintf(stderr, "Option %s re-uses shortopt '%c'\n", options[i].name, options[i].shortopt); return false; } } return true; } #endif // NO_DEBUG static const char *argproto(int opt, bool shortopt) { const char *result = ""; switch (options[opt].argtype) { case at_none: break; case at_num: result = (shortopt ? " n" : "=n"); break; case at_str: result = (shortopt ? " s" : "=s"); break; } return result; } static char *set_help(long long dummy) { puts("Usage: swapspace [options]\n" "Dynamic swap space manager for GNU/Linux.\n\n" "Options are:"); size_t longestopt = 1; for (int i=0; i < sizeof(options)/sizeof(*options); ++i) { size_t len = strlen(options[i].name); if (len > longestopt) longestopt = len; } for (int i=0; i < sizeof(options)/sizeof(*options); ++i) { static const char pad[] = " "; const char *const pt = argproto(i, true); size_t ptlen; ptlen = strlen(pt); assert(ptlen < strlen(pad)); printf(" -%c%s,%s--%s%s%*s\t%s\n", options[i].shortopt, pt, pad+ptlen, options[i].name, argproto(i, false), (int)(longestopt+2-strlen(options[i].name)-2*strlen(pt)), "", options[i].desc); } puts(copyright); exit(EXIT_SUCCESS); } #else static void short_usage(void) { puts("This is the unconfigurable version of swapspace.\n" "\n" "Usage: swapspace [-d] [-h] [-p] [-V]\n" "\t-d run as daemon" "\t-h display this overview and exit\n" "\t-p create pidfile\n" "\t-q (ignored)\n" "\t-v (ignored)\n" "\t-V display version information and exit\n" "\n" "Use zero-argument version for normal operation."); puts(copyright); exit(EXIT_SUCCESS); } #endif // NO_CONFIG char *set_version(long long dummy) { if (PACKAGE_VERSION) puts(PACKAGE_STRING); else puts("swapspace unknown"); puts(copyright); exit(EXIT_SUCCESS); } #ifndef NO_CONFIG /// Emit error message about configuration. Returns false. static bool config_error(const char msg[]) { fprintf(stderr, "%s: %s\n", configfile, msg); return false; } static bool value_error(const char keyword[], const char msg[]) { fprintf(stderr, "Configuration error: '%s': %s\n", keyword, msg); return false; } static bool handle_configitem(const char keyword[], const char *value) { const struct option keyopt = { keyword, 0, 0, 0, 0 }; const struct option *const opt = bsearch(&keyopt, options, sizeof(options)/sizeof(*options), sizeof(*options), optcmp); if (!opt) return value_error(keyword, "unknown configuration item"); long long numarg = 0; size_t arglen = 0; if (value) arglen = strlen(value); const char *err = NULL; if (value) switch (opt->argtype) { case at_none: err = "does not take an argument"; break; case at_num: if (!*value) err = "requires a numeric argument"; else { char *endptr; numarg = strtoll(value, &endptr, 0); if (*endptr) switch (tolower(*endptr++)) { case 'k': numarg *= KILO; break; case 'm': numarg *= MEGA; break; case 'g': numarg *= GIGA; break; case 't': numarg *= TERA; break; default: err = "invalid unit letter"; } if (*endptr) err = "invalid numeric argument"; else if (numarg < opt->min) switch (opt->min) { case 0: err = "argument may not be negative"; break; case 1: err = "argument must be greater than zero"; break; default: err = "given value too small"; break; } else if (numarg > opt->max) err = "given value too large"; } break; case at_str: if (arglen > opt->max) err = "string too long"; break; } else if (opt->argtype == at_num || (opt->argtype == at_str && opt->min)) { err = "requires an argument"; } if (err) return value_error(keyword, err); char *const strdest = opt->setter(numarg); if (strdest && value) strcpy(strdest, value); return true; } static bool read_config(void) { FILE *fp = fopen(configfile, "r"); if (!fp) { const int err = errno; const bool nofile = (err == ENOENT); // TODO: It's also an error if nofile and -c option used if (!nofile) perror("Could not open configuration file"); else if (!quiet) fputs("Using default configuration\n",stderr); return nofile; } while (fgets(localbuf, sizeof(localbuf), fp)) { // Cut line short at hash character, if any int j; for (j=0; localbuf[j] && localbuf[j] != '#'; ++j); localbuf[j] = '\0'; char key[100], val[PATH_MAX], dummy[2]; // TODO: Check that quotes are closed properly if (sscanf(localbuf," %100[a-z_] = \"%"PMS"[^\"]\" %1s",key,val,dummy)==2 || sscanf(localbuf," %100[a-z_] = %"PMS"s %1s",key,val,dummy) == 2) { if (!handle_configitem(key, val)) return false; } else if (sscanf(localbuf," %100[a-z_] %1s",key,dummy) == 1) { if (!handle_configitem(key, NULL)) return false; } else if (sscanf(localbuf," %1s",dummy) > 0) { return config_error("syntax error"); } } if (ferror(fp)) { perror("Error reading configuration file"); return false; } return true; } /// Parse command line. Clobbers localbuf. static bool read_cmdline(int argc, char *argv[]) { assert(argv[argc-1]); assert(!argv[argc]); for (int i=1; i= sizeof(localbuf)) { fprintf(stderr, "Option name too long\n"); return false; } strncpy(localbuf, optname, optnamelen); localbuf[optnamelen] = '\0'; optname = localbuf; nextarg = eqsign + 1; } } else { // Short option name (starting with single dash) int j; for (j=0; j