liblockfile-1.17/0000755310016000000620000000000014004565461013102 5ustar mikevsstaffliblockfile-1.17/COPYRIGHT0000644310016000000620000000220313013622604014362 0ustar mikevsstaff Liblockfile is (c) Copyright 1999-2016 Miquel van Smoorenburg. Changes submitted by other people in the form of patches remain under their copyright but are licensed under the same conditions as liblockfile. See the ChangeLog file for details. This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. The complete GPL-2 license is included in the licenses/ directory. Dotlockfile is (c) Copyright 1999-2016 Miquel van Smoorenburg. Changes submitted by other people in the form of patches remain under their copyright but are licensed under the same conditions as dotlockfile. See the ChangeLog file for details. 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. The complete LGPL-2 license is included in the licenses/ directory. liblockfile-1.17/Changelog0000644310016000000620000003021014004550764014710 0ustar mikevsstaffliblockfile (1.17) * dotlockfile: '-P' option: allow passing through the child exit code * dotlockfile: '-i interval' option. * dotlockfile: document -q * add L_RMSTALE return status (failed to remove stale lock) * remove cistron.nl email address -- Miquel van Smoorenburg Wed, 27 Jan 2021 00:33:10 +0100 v1.16 liblockfile (1.16) * lockfile.c: remove all the permission checking in the normal case. Only if creating the tempfile / removing the lockfile returns EACCESS, check to see if this is a mail-lockfile, if so launch helper. * dotlockfile.c: use same mail-lockfile check as lockfile.c, but a bit more strict. * dotlockfile: actually honor -q flag (quiet) everywhere -- Miquel van Smoorenburg Mon, 29 Jul 2019 19:31:09 +0200 liblockfile (1.15) * dotlockfile.1: Fix groff syntax (from 1.14-1.1 debian NMU by Mattia Rizzolo ) * dotlockfile.1: Some minor fixes in the manual (from https://bugs.debian.org/899344) * fix getgroups() check in lockfile.c (Thomas Finke), add some cleanups * fix gcc warning about snprintf in lockfile_create_save_tmplock() (not an actual bug) * fix gcc warning about strncpy in ismaillock() (not an actual bug) * add support for systems that do not have PATH_MAX (fixes https://github.com/miquels/liblockfile/issues/1) * rename configure.in to configure.ac and run autoconf (fixes https://github.com/miquels/liblockfile/issues/2) -- Miquel van Smoorenburg Tue, 23 Jul 2019 23:25:53 +0200 liblockfile (1.14) * allow '-m' option again when executing command (why disallow it) * drop privs just after fork (and before execv) instead of earlier * before executing command, chdir back to original working directory. -- Miquel van Smoorenburg Tue, 17 Jan 2017 13:58:25 +0100 liblockfile (1.13) * remove '-t' as option when running a command- do touchlock automatically if -p was not given. * drop effective gid asap, retain as saved gid. only restore egid if nessecary. * if stat() fails, drop saved gid as well, and retry (sshfs is strict) * don't allow executing a command with the -m option, not nessecary. should really add a minimal setgid util for maillock(), remove setgid from dotlockfile, and let it use the library maillock(). -- Miquel van Smoorenburg Thu, 05 Jan 2017 23:10:35 +0100 liblockfile (1.12) * update lockfile_create.3 manpage, document L_PPID -- Miquel van Smoorenburg Thu, 05 Jan 2017 11:37:22 +0100 liblockfile (1.11) * fix dotlockfile -r -1 functionality * add dotlockfile cmd args... functionality * dotlockfile: use geteuid() instead of getuid() to find out mailboxname. * before forking an external program, first check geteuid() != 0, then do setuid(geteuid()) -- Miquel van Smoorenburg Tue, 03 Jan 2017 20:45:15 +0100 liblockfile (1.10) * add complete GPL/LGPL licenses to source code * Merge all debian patches into upstream * fail to lock if parent is PID 1 - makes no sense to write PID 1 as owning process into the lockfile (Per Cederqvist ) -- Miquel van Smoorenburg Fri, 18 Nov 2016 14:14:28 +0100 liblockfile (1.09) * Update path to full license in the COPYRIGHT file (Anibal Monsalve Salazar) * Remove debug code from lockfile_create(): The lockfile_create-function still contains some debug code, which considers a lock stale after 10 seconds instead of 5 minutes. As the documentation suggests refreshing the lock every 60 seconds, programs might lose the lock unexpectedly. Found while researching debian bug #505278. (Wolfram Sang ) * Updated dotlockfile manpage and updated dotlockfile usage message. Fixes debian bug 493462 (Roland Eggner ) * Change 'ar' in Makefile.in to '$(AR)' (for cross builds). Fixes debian bug 562937 (Wolfram Sang ) * Clean up temporary lockfile if lockfile(1) was interrupted. * dotlockfile now also allows you to create a lockfile in a group-writable-by-one-of-your-auxilary-groups directory * dotlockfile: -r-1 now retries indefinitely (well, 4000 years) * remove ppsh macro in dotlockfile.1, replace with standard .SH (Iain Calder ) -- Miquel van Smoorenburg Wed, 20 Jul 2011 15:54:58 +0200 liblockfile (1.08) * When not writing a pid into the lockfile, write "0\n" as placeholder instead of "0\0" (bug reported by Rob Browning ) * lockfile_check() did the following: - open lockfile - read from it - stat file and get atime as 'now' this gets the 'now' time from the filesystem so comparisations to mtime work even if the clock of the remote file server is off. However this doesn't work with noatime / relatime, so now we stat the lockfile both before and after the read and use atime only if it differs before and after. * Copy Changelog from debian/changelog now that the package isn't native anymore since 1.07 -- Miquel van Smoorenburg Thu, 24 Jul 2008 22:40:34 +0200 liblockfile (1.07-1) unstable; urgency=low * Fixed "liblockfile1: option -u is duplicated". Closes: #416271 -- Anibal Monsalve Salazar Sat, 05 Apr 2008 12:14:10 +1000 liblockfile (1.06.2) unstable; urgency=low * Non-maintainer upload. * Rename eaccess() to eaccess_write() as eaccess is now a glibc function. Patch by Colin Watson. Closes: #392779. -- Aurelien Jarno Sun, 03 Jun 2007 19:28:33 +0200 liblockfile (1.06.1) unstable; urgency=low * Non-maintainer upload. * Remove postinst and prerm scripts, completing the /usr/doc tarnsition. Closes: #322790 -- Joey Hess Tue, 10 Jan 2006 01:21:31 -0500 liblockfile (1.06) unstable; urgency=low * Fix manpage - fd = open("/var/mail/USER.lock") should be fd = open("/var/mail/USER"); * Remove extraneous free() from lockfile.c (closes: #217740) * If the existing lockfile is not valid, the first try isn't really valid either - in that case, even if we want to try locking just once, try once more. (closes: #217741) -- Miquel van Smoorenburg Fri, 4 Jun 2004 17:16:04 +0200 liblockfile (1.05) unstable; urgency=low * Fix "does not give a valid preprocessing token" cpp problem (closes: #194823) -- Miquel van Smoorenburg Mon, 2 Jun 2003 14:27:58 +0200 liblockfile (1.04) unstable; urgency=low * Dynamically allocate filename memory, do not use MAXPATHLEN sized static buffers (closes: #144129, #105973) * Make the '-c' option of dotlockfile(1) actually work (closes: #103998) * Dotlockfile '-r' arg error checking * Note in manpages that unlocking a non-existant file is not an error. * Note in dotlockfile manpage that the lockfile_create manpage is in the liblockfile-dev package. * Update COPYRIGHT file (closes: #178200) * Don't sleep for 5 seconds when we removed an invalid lockfile (closes: #131316) * This upload will force a rebuild with current binutils (closes: #176340) * Add symlinks for manpages (closes: #99546) * Add static library liblockfile.a to liblockfile-dev (closes: #183817) * Actually handle 'retries' as number of *re*tries everywhere, not the number of tries. * Document that the default number of retries in dotlockfile is 5. * Add a '-t' (touchlock) option to dotlockfile (closes: #41791) -- Miquel van Smoorenburg Thu, 15 May 2003 16:29:32 +0200 liblockfile (1.03) unstable; urgency=low * Some more manpage updates * Set priority for liblockfile1 to "important" (closes: #92551) -- Miquel van Smoorenburg Fri, 6 Apr 2001 09:53:32 +0200 liblockfile (1.02) unstable; urgency=low * Maintainer upload (closes: #87488, #80753, #87670, #48886, #50564, #57890, #80601) * Added section to manpages that explains that you need to flush the actual file being locked after locking (closes: #43491) -- Miquel van Smoorenburg Thu, 29 Mar 2001 00:55:55 +0200 liblockfile (1.01.2) unstable; urgency=low * Non-Maintainer Upload for Bug Squashing Party. * Fix typo in postrm, closes: #87670. * Removed *~ from sources. -- Jordi Mallach Sat, 17 Mar 2001 05:09:54 +0100 liblockfile (1.01.1) unstable; urgency=low * NMU for bugsquashing day. * Updated man pages and usr/doc dir to FHS, Closes: #80753 (serious) * Only run ldconfig in postinst if the package is being configured. * Run ldconfig in the postrm on removal. * Fixed shlibs file perms, Closes: #50564, #57890 * Fixed descriptions, Closes: #80601 * Fixed man page typo, Closes: #48886 * Lintian clean except the warning about the setgid binary. -- Joey Hess Sat, 24 Feb 2001 13:55:27 -0800 liblockfile (1.01) unstable; urgency=low * Fix "clean" target in debian/rules * Fixes bugs: #39813: Liblockfile failes to build because of missing Makefile #39864: liblockfile_1.0(unstable): can't clean already empty tree -- Miquel van Smoorenburg Mon, 21 Jun 1999 19:47:17 +0200 liblockfile (1.0) unstable; urgency=low * Added autoconf to the distribution so that this package might be used outside Debian and even outside Linux. * New soname for liblockfile; API change. * Included command-line utility "dotlockfile" (setgid mail) and manpage * library can call "dotlockfile" to do the actual locking - mailprograms do not need to be setgid mail anymore! * Doesn't include libnfslock anymore * Fixes: #29572: liblockfile0 bad packaging -- Miquel van Smoorenburg Sat, 5 Jun 1999 17:19:30 +0200 liblockfile (0.1-6) frozen unstable; urgency=high * Fixed libnfslock to work together with mutt's mutt_dotlock. This has high urgency because otherwise mutt won't be able to lock your mailbox 95% of the time. -- Miquel van Smoorenburg Wed, 2 Dec 1998 17:39:54 +0100 liblockfile (0.1-5) unstable; urgency=low * Added L_MANLOCK define for compatibility , it's not actually used. * Fixes bugs: #21925 liblockfile man page is inaccurate #27275 liblockfile0: wishlist "user" argument for mailunlock and touchlock. -- Miquel van Smoorenburg Mon, 5 Oct 1998 12:35:42 +0200 liblockfile (0.1-4) unstable; urgency=low * Fixes: #13974: liblockfile-dev: maillock(3) mentions other manpages, that are not #18521: liblockfile-dev should not include /usr/lib/liblockfile.so #19042: liblockfile-dev: Overlap with liblockfile0 #18527: liblockfile0: liblockfile0 include .so link in liblockfile-dev #19041: liblockfile0: Overlap with liblockfle-dev and no conflict #19108: liblockfile0 has incorrect shlibs listed #18607: libnfslock: postinst and prerm scripts fail if ld.so.preload only #18913: libnfslock: package description -- Miquel van Smoorenburg Sun, 8 Mar 1998 22:41:49 +0100 liblockfile (0.1-3) unstable; urgency=low * Added version in name for nfslock.so (now nfslock.so.0.1) * Added shlibs file for nfslock * Add missing symlinks Fixes: #14413: /usr/doc/$(PACKAGE)/copyright should not be compressed #17693: liblockfile0 has executabnle changelog.gz #16489: liblockfile0 lacks dependency information #14155: lockfile_create could ignore some errors #14423: /usr/doc/$(PACKAGE)/copyright should not be compressed #15220: liblockfile-dev changelog is executable #14412: /usr/doc/$(PACKAGE)/copyright should not be compressed -- Miquel van Smoorenburg Thu, 19 Feb 1998 23:15:01 +0100 liblockfile (0.1-2) unstable; urgency=low * Compiled with libc6 and with -lc * Compile with -D_REENTRANT and -D_GNU_SOURCE * Apart from returning the L_XXX values, also set errno to something resonable. * Reckognize common NFS lockfiles from mailx -- Miquel van Smoorenburg Wed, 24 Sep 1997 12:52:44 +0200 liblockfile (0.1-1) unstable; urgency=low * First Debian release. -- Miquel van Smoorenburg Sun, 6 Jul 1997 16:04:55 +0200 liblockfile-1.17/Makefile.in0000644310016000000620000000624014004536727015154 0ustar mikevsstaff# # Makefile.in Makefile for the liblockfile package # MAJOR = 1 SOVER = 1.0 NFSVER = 0.1 CFLAGS = @CFLAGS@ -I. LDFLAGS = @LDFLAGS@ CC = @CC@ prefix = $(DESTDIR)@prefix@ exec_prefix = @exec_prefix@ bindir = @bindir@ libdir = @libdir@ mandir = @mandir@ nfslockdir = @nfslockdir@ includedir = @includedir@ datarootdir = @datarootdir@ MAILGROUP = @MAILGROUP@ VERSION = $(shell sed -ne "1s/^liblockfile (\(.*\))/\1/p" < Changelog) all: @TARGETS@ install: @INSTALL_TARGETS@ static: liblockfile.a dotlockfile shared: liblockfile.so liblockfile.a dotlockfile nfslib: nfslock.so.$(NFSVER) liblockfile.a: lockfile.o $(AR) rv liblockfile.a lockfile.o liblockfile.so: solockfile.o $(CC) $(LDFLAGS) -fPIC -shared -Wl,-soname,liblockfile.so.1 \ -o liblockfile.so solockfile.o -lc nfslock.so.$(NFSVER): nfslock.o $(CC) $(LDFLAGS) -fPIC -shared -Wl,-soname,nfslock.so.0 \ -o nfslock.so.$(NFSVER) nfslock.o dotlockfile: dotlockfile.o dlockfile.o $(CC) $(LDFLAGS) -o dotlockfile dotlockfile.o dlockfile.o dotlockfile.o: dotlockfile.c $(CC) $(CFLAGS) -DLOCKPROG=\"$(bindir)/dotlockfile\" \ -c dotlockfile.c lockfile.o: lockfile.c $(CC) $(CFLAGS) -DLIB -DLOCKPROG=\"$(bindir)/dotlockfile\" \ -DSTATIC -c lockfile.c solockfile.o: lockfile.c $(CC) $(CFLAGS) -DLIB -DLOCKPROG=\"$(bindir)/dotlockfile\" \ -c lockfile.c -o solockfile.o dlockfile.o: lockfile.c $(CC) $(CFLAGS) -DLOCKPROG=\"$(bindir)/dotlockfile\" \ -c lockfile.c -o dlockfile.o install_static: static install_common install -d -m 755 -g root -p $(libdir) install -m 644 liblockfile.a $(libdir) install_shared: shared install_static install_common install -d -m 755 -g root -p $(libdir) install -m 755 liblockfile.so \ $(libdir)/liblockfile.so.$(SOVER) ln -s liblockfile.so.$(SOVER) $(libdir)/liblockfile.so.$(MAJOR) ln -s liblockfile.so.$(SOVER) $(libdir)/liblockfile.so if test "$(DESTDIR)" = ""; then @LDCONFIG@; fi install_common: install -d -m 755 -g root -p $(includedir) install -d -m 755 -g root -p $(bindir) install -d -m 755 -g root -p $(mandir)/man1 install -d -m 755 -g root -p $(mandir)/man3 install -m 644 lockfile.h maillock.h $(includedir) if [ "$(MAILGROUP)" != "" ]; then\ install -g $(MAILGROUP) -m 2755 dotlockfile $(bindir);\ else \ install -g root -m 755 dotlockfile $(bindir); \ fi install -m 644 *.1 $(mandir)/man1 install -m 644 *.3 $(mandir)/man3 install_nfslib: nfslib install -d -m 755 -g root -p $(nfslockdir) install -m 755 nfslock.so.$(NFSVER) $(nfslockdir) if test "$(DESTDIR)" = ""; then @LDCONFIG@; fi test: test-stamp @: test-stamp: dotlockfile ./run-tests.sh touch test-stamp tar: tarball @: tarball: clean (tar --xform "s/^liblockfile/liblockfile-$(VERSION)/" \ --exclude Makefile --exclude autoconf.h --exclude maillock.h \ --exclude config.cache --exclude config.log --exclude config.status \ --exclude autom4te.cache \ --exclude-vcs --exclude-vcs-ignores \ -C .. -czf ../liblockfile-$(VERSION).tar.gz liblockfile ) clean: rm -f *.a *.o *.so *.so.* dotlockfile test-stamp distclean: clean rm -f Makefile autoconf.h maillock.h \ config.cache config.log config.status; \ rm -rf autom4te.cache liblockfile-1.17/README0000644310016000000620000000241114004122622013744 0ustar mikevsstaff README for liblockfile This library implements a number of functions found in -lmail on SysV systems. These functions are designed to lock the standard mailboxes in /var/mail (or wherever the system puts them). In additions, this library adds a number of functions to create, manage and remove generic lockfiles. The lockfiles are created by this library in an NFS-safe manner, that is by using a tempfile and using link(2) to create the lockfile. It works around several defects in NFS servers to make sure the lockfile is created atomically. The locking strategy is compatible with other well-written NFS-safe programs that create lockfiles - such as procmail, exim and mutt. If you are trying to lock a mailbox in a directory writable for group mail, the locking functions will call a helper application which runs setgid to do the actual locking. The helper application "dotlockfile" can also be used directly, for example for use in shellscripts. This means a program such as a MUA doesn't need to be setgid mail anymore to be able to lock the mailbox. See the included manualpages for more info: Function Manpage ======== ======= maillock, mailunlock, touchlock - maillock.3 lockfile_create, lockfile_remove, lockfile_touch, lockfile_check - lockfile_create.3 liblockfile-1.17/acconfig.h0000644310016000000620000000040007254561501015016 0ustar mikevsstaff/* acconfig.h - template used by autoheader to create config.h.in config.h.in - used by autoconf to create config.h config.h - created by autoconf; contains defines generated by autoconf */ @TOP@ /* Is the mailspool group writable */ #undef MAILGROUP liblockfile-1.17/autoconf.h.in0000644310016000000620000000137507254561501015504 0ustar mikevsstaff/* autoconf.h.in. Generated automatically from configure.in by autoheader. */ /* acconfig.h - template used by autoheader to create config.h.in config.h.in - used by autoconf to create config.h config.h - created by autoconf; contains defines generated by autoconf */ /* Define if you have the ANSI C header files. */ #undef STDC_HEADERS /* Is the mailspool group writable */ #undef MAILGROUP /* Define if you have the utime function. */ #undef HAVE_UTIME /* Define if you have the utimes function. */ #undef HAVE_UTIMES /* Define if you have the header file. */ #undef HAVE_GETOPT_H /* Define if you have the header file. */ #undef HAVE_PATHS_H /* Define if you have the header file. */ #undef HAVE_SYS_PARAM_H liblockfile-1.17/configure0000755310016000000620000041611413515353440015016 0ustar mikevsstaff#! /bin/sh # From configure.ac Revision: 1.0 . # Guess values for system-dependent variables and create Makefiles. # Generated by GNU Autoconf 2.69. # # # Copyright (C) 1992-1996, 1998-2012 Free Software Foundation, Inc. # # # This configure script is free software; the Free Software Foundation # gives unlimited permission to copy, distribute and modify it. ## -------------------- ## ## M4sh Initialization. ## ## -------------------- ## # Be more Bourne compatible DUALCASE=1; export DUALCASE # for MKS sh if test -n "${ZSH_VERSION+set}" && (emulate sh) >/dev/null 2>&1; then : emulate sh NULLCMD=: # Pre-4.2 versions of Zsh do word splitting on ${1+"$@"}, which # is contrary to our usage. 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It creates lockfiles .I reliably on local and NFS filesystems, because the crucial steps of testing for a preexisting lockfile and creating it are performed .I atomically by a .I single call to .IR link (2). Manpage .IR lockfile_create (3) describes the used algorithm. .PP .B dotlockfile is installed with attribute .BI SETGID \ mail and thus can also be used to lock and unlock mailboxes .I even if the mailspool directory is only writable by group mail. .PP The name .B dotlockfile comes from the way mailboxes are locked for updates on a lot of UNIX systems. A lockfile is created with the same filename as the mailbox but with the string "\fI.lock\fR" appended. .PP The names .B dotlock and .B lockfile were already taken \(en hence the name \fBdotlockfile\fR \fI:)\fR. .SH OPTIONS .IP "\fB\-l\fR" Create a lockfile if no preexisting valid lockfile is found, else wait and retry according to option \fB\-r\fR. Retry interval can be explicitly set with option \fB\-i\fR. This option (\fB-l\fR) is the default, so it can be left off. A lockfile is treated as valid, .br \[bu]\ \ if it holds the .I process\-id of a running process, .br \[bu]\ \ or if it does not hold any .I process\-id and has been touched less than 5\ minutes ago (timestamp is younger than 5\ minutes). .IP "\fB\-r retries\fR" The number of times .B dotlockfile retries to acquire the lock if it failed the first time before giving up. The initial sleep after failing to acquire the lock is 5\ seconds. After each retry the sleep interval is increased incrementally by 5\ seconds up to a maximum sleep of 60\ seconds between tries unless overridden by \fB\-i\fR. The default number of retries is 5. To try only once, use "\fB\-r 0\fR". To try indefinitely, use "\fB\-r \-1\fR". .IP "\fB\-i interval\fR" Sets a consistent retry interval. .IP "\fB\-u\fR" Remove a lockfile. .IP "\fB\-t\fR" Touch an existing lockfile (update the timestamp). Useful for lockfiles on NFS filesystems. For lockfiles on local filesystems the .B \-p option is preferable. .IP "\fB\-p\fR" Write the .I process\-id of the calling process (or dotlockfile itself if a command is executed) into the lockfile. Also when testing for an existing lockfile, check the contents for the .I process\-id of a running process to verify if the lockfile is still valid. Obviously useful only for lockfiles on local filesystems. .IP "\fB\-m\fR" Lock or unlock the current users mailbox. The path to the mailbox is the default system mailspool directory (usually .IR /var/mail ) with the username as gotten from .IR getpwuid () appended. If the environment variable .I $MAIL is set, that is used instead. Then the string "\fI.lock\fR" is appended to get the name of the actual lockfile. .IP "\fB\-q\fR" Don't print warnings or errors to the standard error output. Used internally by liblockfile when it spawns .B dotlockfile as a helper program. .IP "\fB\-P\fR" On successful "lock and spawn command", don't exit with status zero, but pass through the exit value of the spawned command. .IP lockfile The lockfile to be created or removed. Must not be specified if the \fB\-m\fR option is given. .IP "\fIcommand\fR argument \&...\&" Create lockfile, run the .I command , wait for it to exit, and remove lockfile. .SH RETURN\ VALUE Zero on success, and non\-zero on failure. When locking (the default, or with the \fB\-l\fR option) .B dotlockfile returns the same values as the library function .IR lockfile_create (3). Unlocking a non\-existent lockfile is not an error. .PP Unless the .B \-P option was supplied, when a command is executed, the return value does not correspond with that of the command that was run. If locking and unlocking was successful, the exit status is zero. .SH NOTES The lockfile is created exactly as named on the command line. The extension "\fI.lock\fR" is \fInot\fR automatically appended. .PP This utility is a lot like the .IR lockfile (1) utility included with .IR procmail , and the .IR mutt_dotlock (1) utility included with .IR mutt . However the command\-line arguments differ, and so does the return status. It is believed, that .I dotlockfile is the most flexible implementation, since it automatically detects when it needs to use privileges to lock a mailbox, and does it safely. .PP The above mentioned .IR lockfile_create (3) manpage is present in the .I liblockfile\-dev package. .SH BUGS None known. .SH SEE\ ALSO .IR lockfile_create (3), .IR maillock (3) .SH AUTHOR Miquel van Smoorenburg liblockfile-1.17/dotlockfile.c0000644310016000000620000002120414004537355015545 0ustar mikevsstaff/* * dotlockfile.c Command line version of liblockfile. * Runs setgid mail so is able to lock mailboxes * as well. Liblockfile can call this command. * * Copyright (C) Miquel van Smoorenburg and contributors 1999-2021 * * 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. */ #include "autoconf.h" #include #if HAVE_SYS_PARAM_H #include #endif #include #include #include #include #include #include #include #include #include #include #include #include #ifdef HAVE_GETOPT_H #include #endif #ifndef HAVE_GETOPT_H extern int getopt(); extern char *optarg; extern int optind; #endif extern int is_maillock(const char *lockfile); extern int lockfile_create_set_tmplock(const char *lockfile, volatile char **tmplock, int retries, int flags, struct __lockargs *); static volatile char *tmplock; static int quiet; /* * If we got SIGINT, SIGQUIT, SIGHUP, remove the * tempfile and re-raise the signal. */ void got_signal(int sig) { if (tmplock && tmplock[0]) unlink((char *)tmplock); signal(sig, SIG_DFL); raise(sig); } void ignore_signal(int sig) { } /* * Install signal handler only if the signal was * not ignored already. */ int set_signal(int sig, void (*handler)(int)) { struct sigaction sa; if (sigaction(sig, NULL, &sa) < 0) return -1; if (sa.sa_handler == SIG_IGN) return 0; memset(&sa, 0, sizeof(sa)); sa.sa_handler = handler; return sigaction(sig, &sa, NULL); } /* * Sleep for an amount of time while regulary checking if * our parent is still alive. */ int check_sleep(int sleeptime, int flags) { int i; int interval = 5; static int ppid = 0; if (ppid == 0) ppid = getppid(); if (flags & __L_INTERVAL) interval = 1; for (i = 0; i < sleeptime; i += interval) { sleep(interval); if (kill(ppid, 0) < 0 && errno == ESRCH) return L_ERROR; } return 0; } /* * Split a filename up in file and directory. */ int fn_split(char *fn, char **fn_p, char **dir_p) { static char *buf = NULL; char *p; if (buf) free (buf); buf = (char *) malloc (strlen (fn) + 1); if (! buf) return L_ERROR; strcpy(buf, fn); if ((p = strrchr(buf, '/')) != NULL) { *p++ = 0; *fn_p = p; *dir_p = buf; } else { *fn_p = fn; *dir_p = "."; } return L_SUCCESS; } /* * Return name of lockfile for mail. */ char *mlockname(char *user) { static char *buf = NULL; char *e; if (buf) free(buf); e = getenv("MAIL"); if (e) { buf = (char *)malloc(strlen(e)+6); if (!buf) return NULL; sprintf(buf, "%s.lock", e); } else { buf = (char *)malloc(strlen(MAILDIR)+strlen(user)+6); if (!buf) return NULL; sprintf(buf, "%s%s.lock", MAILDIR, user); } return buf; } void perror_exit(const char *why) { if (!quiet) { fprintf(stderr, "dotlockfile: "); perror(why); } exit(L_ERROR); } /* * Print usage mesage and exit. */ void usage(void) { fprintf(stderr, "Usage: dotlockfile -l [-r retries] [-i interval] [-p] [-q] <-m|lockfile>\n"); fprintf(stderr, " dotlockfile -l [-r retries] [-i interval] [-p] [-q] <-m|lockfile> [-P] command args...\n"); fprintf(stderr, " dotlockfile -u|-t\n"); exit(1); } int main(int argc, char **argv) { struct passwd *pwd; struct __lockargs args = { 0 }; gid_t gid, egid; char *lockfile = NULL; char **cmd = NULL; int c, r; int retries = 5; int interval = 0; int flags = 0; int lock = 0; int unlock = 0; int check = 0; int touch = 0; int writepid = 0; int passthrough = 0; /* * Remember real and effective gid, and * drop privs for now. */ if ((gid = getgid()) < 0) perror_exit("getgid"); if ((egid = getegid()) < 0) perror_exit("getegid"); if (gid != egid) { if (setregid(-1, gid) < 0) perror_exit("setregid(-1, gid)"); } set_signal(SIGINT, got_signal); set_signal(SIGQUIT, got_signal); set_signal(SIGHUP, got_signal); set_signal(SIGTERM, got_signal); set_signal(SIGPIPE, got_signal); /* * Process the options. */ while ((c = getopt(argc, argv, "+qpNr:mluci:tP")) != EOF) switch(c) { case 'q': quiet = 1; break; case 'p': writepid = 1; break; case 'N': /* NOP */ break; case 'r': retries = atoi(optarg); if (retries <= 0 && retries != -1 && strcmp(optarg, "0") != 0) { if (!quiet) fprintf(stderr, "dotlockfile: " "-r %s: invalid argument\n", optarg); return L_ERROR; } if (retries == -1) { /* 4000 years */ retries = 0x7ffffff0; } break; case 'm': if ((pwd = getpwuid(geteuid())) == NULL) { if (!quiet) fprintf(stderr, "dotlockfile: You don't exist. Go away.\n"); return L_ERROR; } lockfile = mlockname(pwd->pw_name); if (!lockfile) { if (!quiet) perror("dotlockfile"); return L_ERROR; } break; case 'l': lock = 1; break; case 'u': unlock = 1; break; case 'c': check = 1; break; case 'i': interval = atoi(optarg); if (interval <= 0 && strcmp(optarg, "0") != 0) { fprintf(stderr, "dotlockfile: -i needs argument >= 0\n"); return L_ERROR; } flags |= __L_INTERVAL; args.interval = interval; break; case 't': touch = 1; break; case 'P': passthrough = 1; break; default: usage(); break; } /* * next argument may be lockfile name */ if (!lockfile) { if (optind == argc) usage(); lockfile = argv[optind++]; } /* * next arguments may be command [args...] */ if (optind < argc) cmd = argv + optind; /* * Options sanity check */ if ((cmd || lock) && (touch || check || unlock)) usage(); if (writepid) flags |= (cmd ? L_PID : L_PPID); #ifdef MAXPATHLEN if (strlen(lockfile) >= MAXPATHLEN) { if (!quiet) fprintf(stderr, "dotlockfile: %s: name too long\n", lockfile); return L_NAMELEN; } #endif /* * Check if we run setgid. */ int cwd_fd = -1; int need_privs = 0; #ifdef MAILGROUP if (gid != egid) { /* * See if the requested lock is for a mailbox. * First, remember currect working directory. */ #ifdef O_PATH cwd_fd = open(".", O_PATH|O_CLOEXEC); #else cwd_fd = open(".", O_RDONLY|O_CLOEXEC); #endif if (cwd_fd < 0) { if (!quiet) fprintf(stderr, "dotlockfile: opening \".\": %s\n", strerror(errno)); return L_ERROR; } /* * Now change directory to the directory the lockfile is in. */ char *file, *dir; r = fn_split(lockfile, &file, &dir); if (r != L_SUCCESS) { if (!quiet) perror("dotlockfile"); return L_ERROR; } if (chdir(dir) != 0) { if (!quiet) fprintf(stderr, "dotlockfile: %s: %s\n", dir, strerror(errno)); return L_ERROR; } lockfile = file; need_privs = is_maillock(lockfile); } #endif /* * See if we actually need to run setgid. */ if (need_privs) { if (setregid(gid, egid) != 0) perror_exit("setregid"); } else { if (gid != egid && setgid(gid) != 0) perror_exit("setgid"); } /* * Simple check for a valid lockfile ? */ if (check) return (lockfile_check(lockfile, flags) < 0) ? 1 : 0; /* * Touch lock ? */ if (touch) return (lockfile_touch(lockfile) < 0) ? 1 : 0; /* * Remove lockfile? */ if (unlock) return (lockfile_remove(lockfile) == 0) ? 0 : 1; /* * No, lock. */ r = lockfile_create_set_tmplock(lockfile, &tmplock, retries, flags, &args); if (r != 0 || !cmd) return r; /* * Spawn command. * * Using an empty signal handler means that we ignore the * signal, but that it's restored to SIG_DFL at execve(). */ set_signal(SIGINT, ignore_signal); set_signal(SIGQUIT, ignore_signal); set_signal(SIGHUP, ignore_signal); set_signal(SIGALRM, ignore_signal); pid_t pid = fork(); if (pid < 0) { if (!quiet) perror("fork"); lockfile_remove(lockfile); exit(L_ERROR); } if (pid == 0) { /* drop setgid */ if (gid != egid && setgid(gid) < 0) { perror("setgid"); exit(127); } /* restore current working directory */ if (cwd_fd >= 0) { if (fchdir(cwd_fd) < 0) { perror("dotlockfile: restoring cwd:"); exit(127); } close(cwd_fd); } /* exec */ execvp(cmd[0], cmd); perror(cmd[0]); exit(127); } /* wait for child */ int e, wstatus; while (1) { if (!writepid) alarm(30); e = waitpid(pid, &wstatus, 0); if (e >= 0 || errno != EINTR) break; if (!writepid) lockfile_touch(lockfile); } alarm(0); lockfile_remove(lockfile); if (passthrough) { if (WIFEXITED(wstatus)) return WEXITSTATUS(wstatus); if (WIFSIGNALED(wstatus)) return 128+WTERMSIG(wstatus); } return 0; } liblockfile-1.17/lockfile_create.30000644310016000000620000001641414004554465016311 0ustar mikevsstaff.TH LOCKFILE_CREATE 3 "27 Januari 2021" "Linux Manpage" "Linux Programmer's Manual" .SH NAME lockfile_create, lockfile_remove, lockfile_touch, lockfile_check \- manage lockfiles .SH SYNOPSIS .B #include .sp .BI "cc [ "flag " ... ] "file " ... -llockfile [ "library " ] " .sp .BI "int lockfile_create( const char *" lockfile ", int " retrycnt ", int " flags " [, struct lockargs " args " ] );" .br .BI "int lockfile_remove( const char *" lockfile " );" .br .BI "int lockfile_touch( const char *" lockfile " );" .br .BI "int lockfile_check( const char *" lockfile ", int " flags " );" .br .SH DESCRIPTION Functions to handle lockfiles in an NFS safe way. .PP .SS lockfile_create The .B lockfile_create function creates a lockfile in an NFS safe way. .PP If flags is set to .B L_PID or .B L_PPID then lockfile_create will not only check for an existing lockfile, but it will read the contents as well to see if it contains a process id in ASCII. If so, the lockfile is only valid if that process still exists. Otherwise, a lockfile older than 5 minutes is considered to be stale. .PP When creating a lockfile, if .B L_PID is set in flags, then the current process' PID will be written to the lockfile. Sometimes it can be useful to use the parent's PID instead (for example, the .B dotlockfile command uses that). In such cases you can use the .B L_PPID flag instead. .PP .SS lockfile_touch If the lockfile is on a shared filesystem, it might have been created by a process on a remote host. So the L_PID or L_PPID method of deciding if a lockfile is still valid or stale is incorrect and must not be used. If you are holding a lock longer than 5 minutes, a call to .B lockfile_create by another process will consider the lock stale and remove it. To prevent this, call .B lockfile_touch to refresh the lockfile at a regular interval (every minute or so). .PP .SS lockfile_check .PP This function checks if a valid lockfile is already present without trying to create a new lockfile. .PP .SS lockfile_remove .PP Removes the lockfile. .SH RETURN VALUES .B lockfile_create returns one of the following status codes: .nf #define L_SUCCESS 0 /* Lockfile created */ #define L_TMPLOCK 2 /* Error creating tmp lockfile */ #define L_TMPWRITE 3 /* Can't write pid int tmp lockfile */ #define L_MAXTRYS 4 /* Failed after max. number of attempts */ #define L_ERROR 5 /* Unknown error; check errno */ #define L_ORPHANED 7 /* Called with L_PPID but parent is gone */ #define L_RMSTALE 8 /* Failed to remove stale lockfile */ .fi .PP .B lockfile_check returns 0 if a valid lockfile is present. If no lockfile or no valid lockfile is present, -1 is returned. .PP .B lockfile_touch and .B lockfile_remove return 0 on success. On failure -1 is returned and .I errno is set appropriately. It is not an error to lockfile_remove() a non-existing lockfile. .SH ALGORITHM The algorithm that is used to create a lockfile in an atomic way, even over NFS, is as follows: .IP 1 A unique file is created. In printf format, the name of the file is .lk%05d%x%s. The first argument (%05d) is the current process id. The second argument (%x) consists of the 4 minor bits of the value returned by \fItime\fP(2). The last argument is the system hostname. .IP 2 Then the lockfile is created using \fIlink\fP(2). The return value of \fIlink\fP is ignored. .IP 3 Now the lockfile is \fIstat\fP()ed. If the stat fails, we go to step \fI6\fP. .IP 4 The \fIstat\fP value of the lockfile is compared with that of the temporary file. If they are the same, we have the lock. The temporary file is deleted and a value of 0 (success) is returned to the caller. .IP 5 A check is made to see if the existing lockfile is a valid one. If it isn't valid, the stale lockfile is deleted. .IP 6 Before retrying, we sleep for \fIn\fP seconds. \fIn\fP is initially 5 seconds, but after every retry 5 extra seconds is added up to a maximum of 60 seconds (an incremental backoff). Then we go to step \fI2\fP up to \fIretries\fP times. .br .PP .SH REMOTE FILE SYSTEMS AND THE KERNEL ATTRIBUTE CACHE .PP These functions do not lock a file - they \fIgenerate\fP a \fIlockfile\fP. However in a lot of cases, such as Unix mailboxes, all concerned programs accessing the mailboxes agree on the fact that the presence of .lock means that is locked. .PP If you are using .B lockfile_create to create a lock on a file that resides on a remote server, and you already have that file open, you need to flush the NFS attribute cache after locking. This is needed to prevent the following scenario: .PP .PD 0 .TP 3 o open /var/mail/USERNAME .TP 3 o attributes, such as size, inode, etc are now cached in the kernel! .TP 3 o meanwhile, another remote system appends data to /var/mail/USERNAME .TP 3 o grab lock using lockfile_create() .TP 3 o seek to end of file .TP 3 o write data .PD 1 .PP Now the end of the file really isn't the end of the file - the kernel cached the attributes on open, and st_size is not the end of the file anymore. So after locking the file, you need to tell the kernel to flush the NFS file attribute cache. .PP The only .I portable way to do this is the POSIX .I fcntl() file locking primitives - locking a file using .I fcntl() has the fortunate side-effect of invalidating the NFS file attribute cache of the kernel. .PP .B lockfile_create() cannot do this for you for two reasons. One, it just creates a lockfile- it doesn't know which file you are actually trying to lock! Two, even if it could deduce the file you're locking from the filename, by just opening and closing it, it would invalidate any existing POSIX locks the program might already have on that file (yes, POSIX locking semantics are insane!). .PP So basically what you need to do is something like this: .nf fd = open("/var/mail/USER"); .. program code .. lockfile_create("/var/mail/USER.lock", x, y); /* Invalidate NFS attribute cache using POSIX locks */ if (lockf(fd, F_TLOCK, 0) == 0) lockf(fd, F_ULOCK, 0); .fi You have to be careful with this if you're putting this in an existing program that might already be using fcntl(), flock() or lockf() locking- you might invalidate existing locks. .PP There is also a non-portable way. A lot of NFS operations return the updated attributes - and the Linux kernel actually uses these to update the attribute cache. One of these operations is .B chmod(2). .PP So stat()ing a file and then chmod()ing it to st.st_mode will not actually change the file, nor will it interfere with any locks on the file, but it will invalidate the attribute cache. The equivalent to use from a shell script would be .nf chmod u=u /var/mail/USER .fi .SH PERMISSIONS If you are on a system that has a mail spool directory that is only writable by a special group (usually "mail") you cannot create a lockfile directly in the mailspool directory without special permissions. .PP Lockfile_create and lockfile_remove check if the lockfile ends in $USERNAME.lock, and if the directory the lockfile is writable by group "mail". If so, an external set group-id mail executable (\fIdotlockfile\fP(1) ) is spawned to do the actual locking / unlocking. .SH FILES /usr/lib/liblockfile.so.1 .SH AUTHOR Miquel van Smoorenburg .SH "SEE ALSO" .BR dotlockfile "(1), " maillock "(3), " touchlock " (3), " mailunlock (3) liblockfile-1.17/lockfile.c0000644310016000000620000003124514004557504015042 0ustar mikevsstaff/* * lockfile.c Safely creates a lockfile, also over NFS. * This file also holds the implementation for * the Svr4 maillock functions. * * Copyright (C) Miquel van Smoorenburg and contributors 1997-2021. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. */ #include "autoconf.h" #include #if HAVE_SYS_PARAM_H #include #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef HAVE_UTIME #include #endif #ifdef LIB static char *mlockfile; static int islocked = 0; #endif #ifndef LIB extern int check_sleep(int, int); #endif #ifdef MAILGROUP /* * Get the id of the mailgroup, by statting the helper program. * If it is setgroup-id, then the group is the mailgroup. */ static int mailgid() { struct stat st; if (stat(LOCKPROG, &st) != 0) return (gid_t)-1; if ((st.st_mode & 02000) == 0) return (gid_t)-1; return st.st_gid; } /* * Is this a lock for a mailbox? Check: * - is the file in /path/to/USERNAME.lock format * - is /path/to/USERNAME present and owned by us * - is /path/to writable by group mail * * To be safe in a setgid program, chdir() into the lockfile * directory first, then pass in the basename of the lockfile. */ #ifdef LIB static #endif int is_maillock(const char *lockfile) { struct stat st; gid_t gid; char tmp[1024]; char *p; /* remove .lock suffix */ strncpy(tmp, lockfile, sizeof(tmp) - 1); tmp[sizeof(tmp) - 1] = 0; if ((p = strrchr(tmp, '.')) == NULL || strcmp(p, ".lock") != 0) return 0; *p = 0; /* file to lock must exist, and must be owned by us */ if (lstat(tmp, &st) != 0 || (st.st_mode & S_IFMT) != S_IFREG || st.st_uid != getuid()) return 0; /* Directory this file is in must be writable by group mail. */ if ((gid = mailgid()) == (gid_t)-1) return 0; if ((p = strrchr(tmp, '/')) != NULL) *p = 0; else strncpy(tmp, ".", sizeof(tmp)); if (stat(tmp, &st) != 0 || st.st_gid != gid || (st.st_mode & 0020) == 0) return 0; return 1; } #ifdef LIB /* * Call external program to do the actual locking. */ static int run_helper(char *opt, const char *lockfile, int retries, int flags) { sigset_t set, oldset; char buf[8]; pid_t pid, n; int st; /* * Better safe than sorry. */ if (geteuid() == 0) return L_ERROR; /* * Block SIGCHLD. The main program might have installed * handlers we don't want to call. */ sigemptyset(&set); sigaddset(&set, SIGCHLD); sigprocmask(SIG_BLOCK, &set, &oldset); /* * Fork, execute locking program and wait. */ if ((pid = fork()) < 0) return L_ERROR; if (pid == 0) { /* drop privs */ if (setuid(geteuid()) < 0) { perror("setuid"); _exit(L_ERROR); } snprintf(buf, sizeof(buf), "%d", retries % 1000); execl(LOCKPROG, LOCKPROG, opt, "-r", buf, "-q", (flags & L_PID) ? "-p" : "-N", lockfile, NULL); _exit(L_ERROR); } /* * Wait for return status - do something appropriate * if program died or returned L_ERROR. */ while ((n = waitpid(pid, &st, 0)) != pid) if (n < 0 && errno != EINTR) break; if (!sigismember(&oldset, SIGCHLD)) sigprocmask(SIG_UNBLOCK, &set, NULL); if (n < 0) return L_ERROR; if (!WIFEXITED(st) || WEXITSTATUS(st) == L_ERROR) { errno = EINTR; return L_ERROR; } return WEXITSTATUS(st); } #endif /* LIB*/ #endif /* MAILGROUP */ #define TMPLOCKSTR ".lk" #define TMPLOCKSTRSZ strlen(TMPLOCKSTR) #define TMPLOCKPIDSZ 5 #define TMPLOCKTIMESZ 1 #define TMPLOCKSYSNAMESZ 23 #define TMPLOCKFILENAMESZ (TMPLOCKSTRSZ + TMPLOCKPIDSZ + \ TMPLOCKTIMESZ + TMPLOCKSYSNAMESZ) static int lockfilename(const char *lockfile, char *tmplock, int tmplocksz) { char sysname[256]; char *p; #ifdef MAXPATHLEN /* * Safety measure. */ if (strlen(lockfile) + TMPLOCKFILENAMESZ > MAXPATHLEN) { errno = ENAMETOOLONG; return L_ERROR; } #endif if (strlen(lockfile) + TMPLOCKFILENAMESZ + 1 > tmplocksz) { errno = EINVAL; return L_ERROR; } /* * Create a temp lockfile (hopefully unique) and write * either our pid/ppid in it, or 0\0 for svr4 compatibility. */ if (gethostname(sysname, sizeof(sysname)) < 0) return L_ERROR; if ((p = strchr(sysname, '.')) != NULL) *p = 0; /* strcpy is safe: length-check above, limited at snprintf below */ strcpy(tmplock, lockfile); if ((p = strrchr(tmplock, '/')) == NULL) p = tmplock; else p++; if (snprintf(p, TMPLOCKFILENAMESZ, "%s%0*d%0*x%s", TMPLOCKSTR, TMPLOCKPIDSZ, (int)getpid(), TMPLOCKTIMESZ, (int)time(NULL) & 15, sysname) < 0) { // never happens but gets rid of gcc truncation warning. errno = EOVERFLOW; return L_ERROR; } return 0; } /* * Create a lockfile. */ static int lockfile_create_save_tmplock(const char *lockfile, char *tmplock, int tmplocksz, volatile char **xtmplock, int retries, int flags, struct __lockargs *args) { struct stat st, st1; char pidbuf[40]; pid_t pid = 0; int sleeptime = 0; int statfailed = 0; int fd; int i, e, pidlen; int dontsleep = 1; int tries = retries + 1; /* process optional flags that have arguments */ if (flags & __L_INTERVAL) { sleeptime = args->interval; } /* decide which PID to write to the lockfile */ if (flags & L_PID) pid = getpid(); if (flags & L_PPID) { pid = getppid(); if (pid == 1) { /* orphaned */ return L_ORPHANED; } } pidlen = snprintf(pidbuf, sizeof(pidbuf), "%d\n", pid); if (pidlen > sizeof(pidbuf) - 1) { errno = EOVERFLOW; return L_ERROR; } /* create temporary lockfile */ if ((i = lockfilename(lockfile, tmplock, tmplocksz)) != 0) return i; if (xtmplock) *xtmplock = tmplock; fd = open(tmplock, O_WRONLY|O_CREAT|O_EXCL|O_CLOEXEC, 0644); if (fd < 0) { /* permission denied? perhaps try suid helper */ #if defined(LIB) && defined(MAILGROUP) if (errno == EACCES && is_maillock(lockfile)) return run_helper("-l", lockfile, retries, flags); #endif return L_TMPLOCK; } i = write(fd, pidbuf, pidlen); e = errno; if (close(fd) != 0) { e = errno; i = -1; } if (i != pidlen) { unlink(tmplock); tmplock[0] = 0; errno = i < 0 ? e : EAGAIN; return L_TMPWRITE; } /* * Now try to link the temporary lock to the lock. */ for (i = 0; i < tries && tries > 0; i++) { if (!dontsleep) { if (!(flags & __L_INTERVAL)) sleeptime += 5; if (sleeptime > 60) sleeptime = 60; #ifdef LIB sleep(sleeptime); #else if ((e = check_sleep(sleeptime, flags)) != 0) { unlink(tmplock); tmplock[0] = 0; return e; } #endif } dontsleep = 0; /* * Now lock by linking the tempfile to the lock. * * KLUDGE: some people say the return code of * link() over NFS can't be trusted. * EXTRA FIX: the value of the nlink field * can't be trusted (may be cached). */ (void)!link(tmplock, lockfile); if (lstat(tmplock, &st1) < 0) { tmplock[0] = 0; return L_ERROR; /* Can't happen */ } if (lstat(lockfile, &st) < 0) { if (statfailed++ > 5) { /* * Normally, this can't happen; either * another process holds the lockfile or * we do. So if this error pops up * repeatedly, just exit... */ e = errno; (void)unlink(tmplock); tmplock[0] = 0; errno = e; return L_MAXTRYS; } continue; } /* * See if we got the lock. */ if (st.st_rdev == st1.st_rdev && st.st_ino == st1.st_ino) { (void)unlink(tmplock); tmplock[0] = 0; return L_SUCCESS; } statfailed = 0; /* * If there is a lockfile and it is invalid, * remove the lockfile. */ if (lockfile_check(lockfile, flags) == -1) { if (unlink(lockfile) < 0 && errno != ENOENT) { /* * we failed to unlink the stale * lockfile, give up. */ return L_RMSTALE; } dontsleep = 1; /* * If the lockfile was invalid, then the first * try wasn't valid either - make sure we * try at least once more. */ if (tries == 1) tries++; } } (void)unlink(tmplock); tmplock[0] = 0; errno = EAGAIN; return L_MAXTRYS; } #ifdef LIB static #endif int lockfile_create_set_tmplock(const char *lockfile, volatile char **xtmplock, int retries, int flags, struct __lockargs *args) { char *tmplock; int l, r, e; l = strlen(lockfile)+TMPLOCKFILENAMESZ+1; if ((tmplock = (char *)malloc(l)) == NULL) return L_ERROR; tmplock[0] = 0; r = lockfile_create_save_tmplock(lockfile, tmplock, l, xtmplock, retries, flags, args); if (xtmplock) *xtmplock = NULL; e = errno; free(tmplock); errno = e; return r; } #ifdef LIB int lockfile_create(const char *lockfile, int retries, int flags) { /* check against unknown flags */ if (flags & ~(L_PID|L_PPID)) { errno = EINVAL; return L_ERROR; } return lockfile_create_set_tmplock(lockfile, NULL, retries, flags, NULL); } #ifdef STATIC int lockfile_create2(const char *lockfile, int retries, int flags, struct __lockargs *args, int args_sz) { #define FLAGS_WITH_ARGS (__L_INTERVAL) #define KNOWN_FLAGS (L_PID|L_PPID|__L_INTERVAL) /* check if size is the same (version check) */ if (args != NULL && sizeof(struct __lockargs) != args_sz) { errno = EINVAL; return L_ERROR; } /* some flags _must_ have a non-null args */ if (args == NULL && (flags & FLAGS_WITH_ARGS)) { errno = EINVAL; return L_ERROR; } /* check against unknown flags */ if (flags & ~KNOWN_FLAGS) { errno = EINVAL; return L_ERROR; } return lockfile_create_set_tmplock(lockfile, NULL, retries, flags, args); } #endif #endif /* * See if a valid lockfile is present. * Returns 0 if so, -1 if not. */ int lockfile_check(const char *lockfile, int flags) { struct stat st, st2; char buf[16]; time_t now; pid_t pid; int fd, len, r; if (stat(lockfile, &st) < 0) return -1; /* * Get the contents and mtime of the lockfile. */ time(&now); pid = 0; if ((fd = open(lockfile, O_RDONLY)) >= 0) { /* * Try to use 'atime after read' as now, this is * the time of the filesystem. Should not get * confused by 'atime' or 'noatime' mount options. */ len = 0; if (fstat(fd, &st) == 0 && (len = read(fd, buf, sizeof(buf))) >= 0 && fstat(fd, &st2) == 0 && st.st_atime != st2.st_atime) now = st.st_atime; close(fd); if (len > 0 && (flags & (L_PID|L_PPID))) { buf[len] = 0; pid = atoi(buf); } } if (pid > 0) { /* * If we have a pid, see if the process * owning the lockfile is still alive. */ r = kill(pid, 0); if (r == 0 || errno == EPERM) return 0; if (r < 0 && errno == ESRCH) return -1; /* EINVAL - FALLTHRU */ } /* * Without a pid in the lockfile, the lock * is valid if it is newer than 5 mins. */ if (now < st.st_mtime + 300) return 0; return -1; } /* * Remove a lock. */ int lockfile_remove(const char *lockfile) { if (unlink(lockfile) < 0) { #if defined(LIB) && defined(MAILGROUP) if (errno == EACCES && is_maillock(lockfile)) return run_helper("-u", lockfile, 0, 0); #endif return errno == ENOENT ? 0 : -1; } return 0; } /* * Touch a lock. */ int lockfile_touch(const char *lockfile) { #ifdef HAVE_UTIME return utime(lockfile, NULL); #else return utimes(lockfile, NULL); #endif } #ifdef LIB /* * Lock a mailfile. This looks a lot like the SVR4 function. * Arguments: lusername, retries. */ int maillock(const char *name, int retries) { char *p, *mail; char *newlock; int i, e; int len, newlen; if (islocked) return 0; #ifdef MAXPATHLEN if (strlen(name) + sizeof(MAILDIR) + 6 > MAXPATHLEN) { errno = ENAMETOOLONG; return L_NAMELEN; } #endif /* * If $MAIL is for the same username as "name" * then use $MAIL instead. */ len = strlen(name)+strlen(MAILDIR)+6; mlockfile = (char *)malloc(len); if (!mlockfile) return L_ERROR; sprintf(mlockfile, "%s%s.lock", MAILDIR, name); if ((mail = getenv("MAIL")) != NULL) { if ((p = strrchr(mail, '/')) != NULL) p++; else p = mail; if (strcmp(p, name) == 0) { newlen = strlen(mail)+6; #ifdef MAXPATHLEN if (newlen > MAXPATHLEN) { errno = ENAMETOOLONG; return L_NAMELEN; } #endif if (newlen > len) { newlock = (char *)realloc (mlockfile, newlen); if (newlock == NULL) { e = errno; free (mlockfile); mlockfile = NULL; errno = e; return L_ERROR; } mlockfile = newlock; } sprintf(mlockfile, "%s.lock", mail); } } i = lockfile_create(mlockfile, retries, 0); if (i == 0) islocked = 1; return i; } void mailunlock(void) { if (!islocked) return; lockfile_remove(mlockfile); free (mlockfile); islocked = 0; } void touchlock(void) { lockfile_touch(mlockfile); } #endif liblockfile-1.17/lockfile.h0000644310016000000620000000365314004554757015060 0ustar mikevsstaff/* * Copyright (C) 1999 Miquel van Smoorenburg * * This library is free software; you can redistribute it and/or modify * it under the terms of the GNU Library General Public License as * published by the Free Software Foundation; either version 2 of the * License, or (at your option) any later version. * * On Debian GNU/Linux systems, the complete text of the GNU Library * General Public License can be found in `/usr/doc/copyright/LGPL'. * You can also find a copy on the GNU website at http://www.gnu.org/ */ #ifndef _LOCKFILE_H #define _LOCKFILE_H #ifdef __cplusplus extern "C" { #endif /* * Prototypes. */ int lockfile_create(const char *lockfile, int retries, int flags); int lockfile_remove(const char *lockfile); int lockfile_touch(const char *lockfile); int lockfile_check(const char *lockfile, int flags); /* * Return values for lockfile_create() */ #define L_SUCCESS 0 /* Lockfile created */ #define L_NAMELEN 1 /* Recipient name too long */ #define L_TMPLOCK 2 /* Error creating temp lockfile */ #define L_TMPWRITE 3 /* Can't write pid into temp lockfile */ #define L_MAXTRYS 4 /* Failed after max. number of attempts */ #define L_ERROR 5 /* Unknown error; check errno */ #define L_MANLOCK 6 /* Cannot set mandatory lock on tempfile */ #define L_ORPHANED 7 /* Called with L_PPID but parent is gone */ #define L_RMSTALE 8 /* Failed to remove stale lockfile */ /* * Flag values for lockfile_create() */ #define L_PID 16 /* Put PID in lockfile */ #define L_PPID 32 /* Put PPID in lockfile */ /* * Experimental. */ struct __lockargs { int interval; /* Static interval between retries */ }; #define __L_INTERVAL 64 /* Specify consistent retry interval */ #ifdef LOCKFILE_EXPERIMENTAL #define lockargs __lockargs #define L_INTERVAL __L_INTERVAL int lockfile_create2(const char *lockfile, int retries, int flags, struct lockargs *args, int args_sz); #endif #ifdef __cplusplus } #endif #endif /* _LOCKFILE_H */ liblockfile-1.17/maillock.30000644310016000000620000000474014004314512014753 0ustar mikevsstaff.TH MAILOCK 3 "28 March 2001" "Linux Manpage" "Linux Programmer's Manual" .SH NAME maillock, mailunlock, touchlock \- manage mailbox lockfiles .SH SYNOPSIS .B #include .sp .BI "cc [ "flag " ... ] "file " ... -llockfile [ "library " ] " .sp .BI "int maillock( const char *" user ", int " retrycnt " );" .br .BI "void mailunlock( "void " );" .br .BI "void touchlock( "void " );" .SH DESCRIPTION The .B maillock function tries to create a lockfile for the users mailbox in an NFS-safe (or resistant) way. The algorithm is documented in .BR lockfile_create "(3)". .PP The mailbox is typically located in .B /var/mail. The name of the lockfile then becomes .B /var/mail/USERNAME.lock. If the environment variable \fI$MAIL\fP is set, and it ends with the same username as the username passed to \fBmaillock\fP(), then that file is taken as the mailbox to lock instead. .PP There is no good way to see if a lockfile is stale. Therefore if the lockfile is older then 5 minutes, it will be removed. That is why the .B touchlock function is provided: while holding the lock, it needs to be refreshed regulary (every minute or so) by calling .B touchlock "() ". .PP Finally the .B mailunlock function removes the lockfile. .SH RETURN VALUES .B maillock returns one of the following status codes: .nf #define L_SUCCESS 0 /* Lockfile created */ #define L_NAMELEN 1 /* Recipient name too long (> 13 chars) */ #define L_TMPLOCK 2 /* Error creating tmp lockfile */ #define L_TMPWRITE 3 /* Can't write pid int tmp lockfile */ #define L_MAXTRYS 4 /* Failed after max. number of attempts */ #define L_ERROR 5 /* Unknown error; check errno */ #define L_RMSTALE 8 /* Failed to remove stale lockfile */ .fi .SH NOTES These functions are not thread safe. If you need thread safe functions, or you need to lock other mailbox (like) files that are not in the standard location, use .BR lockfile_create "(3)" instead. .PP These functions call .BR lockfile_create "(3)" to do the work. That function might spawn a set group-id executable to do the actual locking if the current process doesn't have enough priviliges. .PP There are some issues with flushing the kernels attribute cache if you are using NFS - see the .I lockfile_create(3) manpage. .SH FILES /var/mail/user.lock, .br /usr/lib/liblockfile.so.1 .SH AUTHOR Miquel van Smoorenburg .SH "SEE ALSO" .BR lockfile_create "(3), " lockfile_touch " (3), " lockfile_remove (3) liblockfile-1.17/maillock.h.in0000644310016000000620000000155107666643456015476 0ustar mikevsstaff/* * Copyright (C) 1999 Miquel van Smoorenburg * * This library is free software; you can redistribute it and/or modify * it under the terms of the GNU Library General Public License as * published by the Free Software Foundation; either version 2 of the * License, or (at your option) any later version. * * On Debian GNU/Linux systems, the complete text of the GNU Library * General Public License can be found in `/usr/doc/copyright/LGPL'. * You can also find a copy on the GNU website at http://www.gnu.org/ */ #ifndef _MAILLOCK_H #define _MAILLOCK_H #ifdef __cplusplus extern "C" { #endif #ifndef _PATH_MAILDIR @PATHMAILDIR@ #endif #define MAILDIR (_PATH_MAILDIR "/") /* * Prototypes. */ int maillock(const char *name, int retries); void touchlock(); void mailunlock(); #ifdef __cplusplus } #endif #include #endif /* _MAILLOCK_H */ liblockfile-1.17/nfslock.c0000644310016000000620000001070707254561501014712 0ustar mikevsstaff/* * nfslock.c This file contains code to do a safe open(file, O_EXCL, ..) * over NFS. That's especially useful for mailspools shared over * NFS, until all MTAs and MUAs use code similar to that here. * * You just compile this file into a shared library and * put it in /lib as nfslock.so. Then add the line * "/lib/nfslock.so" to /etc/ld.so.preload. That's all. * * To compile: cc -fPIC -shared -o nfslock.so nfslock.c * * Version: @(#)nfslock.c 1.20 30-Nov-1998 miquels@cistron.nl * */ #include "autoconf.h" #include #include #include #include #include #include #include #include #ifndef __linux__ # error This is really only meant for Linux systems, sorry. #endif extern int __libc_open(const char *, int, ...); static struct utsname uts; /* * See if the directory where is certain file is in * is located on an NFS mounted volume. */ static int is_nfs(const char *file) { char dir[1024]; char *s; struct stat st; strncpy(dir, file, sizeof(dir)); if ((s = strrchr(dir, '/')) != NULL) *s = 0; else strcpy(dir, "."); if (stat(dir, &st) < 0) return 0; return ((st.st_dev & 0xFF00) == 0); } /* * See if this is a temporary file of Exim/procmail/qpopper. * In that case, we do not run the special algorithm. */ static int istmplock(const char *file) { char *p, *s; int len, i; if ((p = strrchr(file, '/')) != NULL) p++; else p = (char *)file; /* Our own temp files. */ if (strncmp(p, ".nfs", 4) == 0) return 1; /* Qpopper. */ if (strncmp(p, ".locktmp", 8) == 0) return 1; /* liblockfile. */ if (strncmp(p, ".lk", 3) == 0) return 1; #if 1 /* Procmail is hard to detect... */ if (strncmp(p, "_", 1) == 0) return 1; #endif /* I see this on our local mail spool often */ if (*(s = p) == '.') { s++; while(*s && *s != '.') s++; if (*s == '.') { s++; while(*s && ((*s >= '0' && *s <= '9') || (*s >= 'a' && *s <= 'f'))) s++; if (*s == 0) return 1; } } /* Exim. */ len = strlen(p); if (len > 18) { s = p - 18; if (s[0] == '.' && s[8] == '.') { for(i = 0; i < 18; i++) { if (i == 0 || i == 8) continue; if ((s[i] >= '0' && s[i] <= '9') || (s[i] >= 'a' && s[i] <= 'f')) continue; i = -1; break; } if (i > 0) return 1; } } /* Mutt. */ if ((s = strrchr(p, '.')) != NULL && s[1] >= '0' && s[1] <= '9') if (atoi(s+1) == getpid()) return 1; /* Doesn't look like a temp lockfile */ return 0; } /* * Put our process ID into a string. */ static void putpid(char *s) { static char pidstr[6]; pid_t pid; int i; if (pidstr[0] == 0) { pid = getpid(); for(i = 0; i < 5; i++) { pidstr[4 - i] = (pid % 10) + '0'; pid /= 10; } pidstr[5] = 0; } strcpy(s, pidstr); } int open(const char *file, int flags, ...) { char tmp[1024]; char *s; int mode, i, e, error; va_list ap; struct stat st1, st2; if (!(flags & O_CREAT)) return __libc_open(file, flags); va_start(ap, flags); mode = va_arg(ap, int); va_end(ap); /* * NFS has no atomic creat-if-not-exist (O_EXCL) but we * can emulate it by creating the file under a temporary * name and then renaming it to the final destination. */ if ((flags & O_EXCL) && !istmplock(file) && is_nfs(file)) { /* * Try to make a unique temp name, network-wide. */ if (strlen(file) > sizeof(tmp) - 16) { errno = ENAMETOOLONG; return -1; } strcpy(tmp, file); if ((s = strrchr(tmp, '/')) != NULL) s++; else s = tmp; *s = 0; strcpy(s, ".nfs"); if (uts.nodename[0] == 0) uname(&uts); for(i = 0; i < 5 && uts.nodename[i] && uts.nodename[i] != '.'; i++) s[4 + i] = uts.nodename[i]; putpid(s + 4 + i); if ((i = __libc_open(tmp, flags, mode)) < 0) return i; /* * We don't just check the result code from link() * but we stat() both files as well to see if they're * the same just to be sure. */ error = link(tmp, file); e = errno; if (error < 0) { (void)unlink(tmp); close(i); errno = e; return error; } error = stat(tmp, &st1); e = errno; (void)unlink(tmp); if (error < 0) { close(i); errno = e; return -1; } if (stat(file, &st2) < 0) { close(i); errno = e; return -1; } if (st1.st_ino != st2.st_ino) { close(i); errno = EEXIST; return -1; } return i; } return __libc_open(file, flags, mode); } int creat(const char *file, mode_t mode) { return open(file, O_CREAT|O_WRONLY|O_TRUNC, mode); } liblockfile-1.17/licenses/0000755310016000000620000000000013013622534014701 5ustar mikevsstaffliblockfile-1.17/licenses/GPL-20000644310016000000620000004325411352247755015431 0ustar mikevsstaff 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. 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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. 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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. If this is what you want to do, use the GNU Lesser General Public License instead of this License. liblockfile-1.17/licenses/LGPL-20000644310016000000620000006144711352716623015544 0ustar mikevsstaff GNU LIBRARY GENERAL PUBLIC LICENSE Version 2, June 1991 Copyright (C) 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. [This is the first released version of the library GPL. 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To apply these terms, attach the following notices to the library. 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 library is free software; you can redistribute it and/or modify it under the terms of the GNU Library General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This library 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 Library General Public License for more details. You should have received a copy of the GNU Library General Public License along with this library; 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. You should also get your employer (if you work as a programmer) or your school, if any, to sign a "copyright disclaimer" for the library, if necessary. Here is a sample; alter the names: Yoyodyne, Inc., hereby disclaims all copyright interest in the library `Frob' (a library for tweaking knobs) written by James Random Hacker. , 1 April 1990 Ty Coon, President of Vice That's all there is to it! liblockfile-1.17/run-tests.sh0000755310016000000620000000240214004300254015366 0ustar mikevsstaff#! /bin/sh # # Some simple tests to check if locking/unlocking works correctly. # set -e PATH=.:$PATH rm -f testlock.lock # lock should succeed dotlockfile -l -r 1 testlock.lock # locking again should fail ! dotlockfile -l -r 0 testlock.lock # unlocking should succeed dotlockfile -u testlock.lock [ ! -f testlock.lock ] || { echo "lockfile still exists after unlock"; exit 1; } # same but with a command dotlockfile -l -r 1 testlock.lock sleep 2 & PID=$! sleep 1 # locking again should fail if dotlockfile -l -r 0 testlock.lock then if kill -0 $PID 2>/dev/null then echo "double lock while running command" exit 1 fi fi # lock should be gone when command completes wait [ ! -f testlock.lock ] || { echo "lockfile still exists after running cmd"; exit 1; } # test locking with given sleep interval dotlockfile -l -r 0 testlock.lock dotlockfile -l -i 4 testlock.lock /bin/true & time_start=$(date '+%s') sleep 4.5 dotlockfile -u testlock.lock wait time_end=$(date '+%s') time_elapsed=`expr $time_end - $time_start` # Time should equal 8 seconds [ "$time_elapsed" = '8' ] || { echo "lockfile should take 8 seconds to be replaced. [$time_elapsed]"; exit 1; } [ ! -f testlock.lock ] || { echo "lockfile still exists after running cmd"; exit 1; } echo "tests OK" liblockfile-1.17/configure.ac0000644310016000000620000000426007254561501015372 0ustar mikevsstaffAC_INIT(lockfile.c) AC_CONFIG_HEADER(autoconf.h) AC_REVISION($Revision: 1.0 $)dnl dnl Check for GNU cc AC_PROG_CC dnl Set Default CFLAGS if test "$GCC" = "yes"; then CFLAGS="$CFLAGS -Wall -D_GNU_SOURCE" fi TARGETS="static" INSTALL_TARGETS="install_static" dnl extra argument: --enable-shared AC_MSG_CHECKING(build shared libs) AC_ARG_ENABLE(shared, [ --enable-shared Build shared libraries], [ case "$enableval" in no) SHARED=no ;; *) SHARED=yes CFLAGS="$CFLAGS -fPIC -D_REENTRANT" TARGETS="shared" INSTALL_TARGETS="install_shared" ;; esac ], SHARED=no ) AC_SUBST(SHARED) AC_MSG_RESULT($SHARED) dnl extra argument: --with-libnfslock nfslockdir="$libdir" AC_MSG_CHECKING(build libnfslock) AC_ARG_WITH(libnfslock, [ --with-libnfslock[=DIR] Build libnfslock (and install in DIR)], [ case "$withval" in no) LIBNFSLOCK=no ;; *) test "$withval" != "no" && nfslockdir="$withval" LIBNFSLOCK=yes TARGETS="$TARGETS nfslib" INSTALL_TARGETS="$INSTALL_TARGETS install_nfslib" ;; esac ], LIBNFSLOCK=no ) AC_SUBST(LIBNFSLOCK) AC_MSG_RESULT($LIBNFSLOCK) dnl extra argument: --with-mailgroup[=mail] AC_ARG_WITH(mailgroup, [ --with-mailgroup[=group] Run setgid (mail) to write to the mailspool], [ case "$withval" in yes) MAILGROUP="mail" ;; *) MAILGROUP="$withval" ;; esac ] ) if test "$MAILGROUP" != ""; then AC_DEFINE_UNQUOTED(MAILGROUP, "$MAILGROUP") fi AC_SUBST(MAILGROUP) dnl Find ldconfig. AC_PATH_PROG(LDCONFIG, ldconfig,, $PATH:/sbin:/usr/sbin) dnl Check for headers AC_HEADER_STDC AC_CHECK_HEADERS( \ getopt.h \ paths.h \ sys/param.h ) AC_CHECK_FUNCS( \ utime \ utimes \ ) if test "$ac_cv_header_paths_h" != "yes"; then dnl Find out where the mail spool is. AC_MSG_CHECKING(location of your mail spool) MAILSPOOL=/var/spool/mail for dir in /var/mail /var/spool/mail /usr/mail /usr/spool/mail do if test -d $dir; then MAILSPOOL=$dir break fi done PATHMAILDIR="#define _PATH_MAILDIR \"$MAILSPOOL\"" AC_MSG_RESULT($MAILSPOOL) else PATHMAILDIR="#include " fi AC_SUBST(PATHMAILDIR) AC_SUBST(TARGETS) AC_SUBST(INSTALL_TARGETS) AC_SUBST(nfslockdir) AC_OUTPUT(\ ./Makefile \ ./maillock.h \ )