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692 lines
18 KiB
C
692 lines
18 KiB
C
/* dotlock.c - dotfile locking
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* Copyright (C) 1998, 2000, 2001, 2003, 2004,
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* 2005, 2006, 2008 Free Software Foundation, Inc.
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*
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* This file is part of JNLIB.
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*
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* JNLIB is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation; either version 3 of
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* the License, or (at your option) any later version.
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*
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* JNLIB is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <ctype.h>
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#include <errno.h>
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#include <unistd.h>
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#ifdef HAVE_DOSISH_SYSTEM
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# define WIN32_LEAN_AND_MEAN
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# include <windows.h>
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#else
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# include <sys/utsname.h>
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#endif
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#include <sys/types.h>
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#include <sys/time.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <signal.h>
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#include "libjnlib-config.h"
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#include "stringhelp.h"
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#include "dotlock.h"
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#if !defined(DIRSEP_C) && !defined(EXTSEP_C) \
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&& !defined(DIRSEP_S) && !defined(EXTSEP_S)
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#ifdef HAVE_DOSISH_SYSTEM
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#define DIRSEP_C '\\'
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#define EXTSEP_C '.'
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#define DIRSEP_S "\\"
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#define EXTSEP_S "."
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#else
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#define DIRSEP_C '/'
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#define EXTSEP_C '.'
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#define DIRSEP_S "/"
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#define EXTSEP_S "."
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#endif
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#endif
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/* The object describing a lock. */
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struct dotlock_handle
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{
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struct dotlock_handle *next;
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char *lockname; /* Name of the actual lockfile. */
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int locked; /* Lock status. */
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int disable; /* If true, locking is disabled. */
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#ifdef HAVE_DOSISH_SYSTEM
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HANDLE lockhd; /* The W32 handle of the lock file. */
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#else
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char *tname; /* Name of the lockfile template. */
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size_t nodename_off; /* Offset in TNAME of the nodename part. */
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size_t nodename_len; /* Length of the nodename part. */
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#endif /* HAVE_DOSISH_SYSTEM */
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};
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/* A list of of all lock handles. */
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static volatile DOTLOCK all_lockfiles;
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/* If this has the value true all locking is disabled. */
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static int never_lock;
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/* Local protototypes. */
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#ifndef HAVE_DOSISH_SYSTEM
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static int read_lockfile (DOTLOCK h, int *same_node);
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#endif /*!HAVE_DOSISH_SYSTEM*/
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/* Entirely disable all locking. This function should be called
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before any locking is done. It may be called right at startup of
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the process as it only sets a global value. */
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void
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disable_dotlock(void)
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{
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never_lock = 1;
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}
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/* Create a lockfile for a file name FILE_TO_LOCK and returns an
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object of type DOTLOCK which may be used later to actually acquire
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the lock. A cleanup routine gets installed to cleanup left over
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locks or other files used internally by the lock mechanism.
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Calling this function with NULL does only install the atexit
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handler and may thus be used to assure that the cleanup is called
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after all other atexit handlers.
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This function creates a lock file in the same directory as
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FILE_TO_LOCK using that name and a suffix of ".lock". Note that on
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POSIX systems a temporary file ".#lk.<hostname>.pid[.threadid] is
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used.
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The function returns an new handle which needs to be released using
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destroy_dotlock but gets also released at the termination of the
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process. On error NULL is returned.
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*/
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DOTLOCK
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create_dotlock (const char *file_to_lock)
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{
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static int initialized;
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DOTLOCK h;
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#ifndef HAVE_DOSISH_SYSTEM
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int fd = -1;
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char pidstr[16];
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const char *nodename;
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const char *dirpart;
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int dirpartlen;
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struct utsname utsbuf;
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size_t tnamelen;
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#endif
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if ( !initialized )
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{
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atexit (dotlock_remove_lockfiles);
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initialized = 1;
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}
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if ( !file_to_lock )
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return NULL; /* Only initialization was requested. */
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h = jnlib_calloc (1, sizeof *h);
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if (!h)
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return NULL;
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if (never_lock)
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{
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h->disable = 1;
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#ifdef _REENTRANT
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/* fixme: aquire mutex on all_lockfiles */
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#endif
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h->next = all_lockfiles;
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all_lockfiles = h;
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return h;
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}
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#ifndef HAVE_DOSISH_SYSTEM
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/*
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This is the POSIX version which uses a temporary file and the
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link system call to make locking an atomic operation.
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*/
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snprintf (pidstr, sizeof pidstr, "%10d\n", (int)getpid() );
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/* fixme: add the hostname to the second line (FQDN or IP addr?) */
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/* Create a temporary file. */
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if ( uname ( &utsbuf ) )
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nodename = "unknown";
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else
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nodename = utsbuf.nodename;
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#ifdef __riscos__
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{
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char *iter = (char *) nodename;
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for (; iter[0]; iter++)
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if (iter[0] == '.')
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iter[0] = '/';
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}
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#endif /* __riscos__ */
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if ( !(dirpart = strrchr (file_to_lock, DIRSEP_C)) )
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{
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dirpart = EXTSEP_S;
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dirpartlen = 1;
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}
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else
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{
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dirpartlen = dirpart - file_to_lock;
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dirpart = file_to_lock;
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}
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#ifdef _REENTRANT
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/* fixme: aquire mutex on all_lockfiles */
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#endif
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h->next = all_lockfiles;
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all_lockfiles = h;
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tnamelen = dirpartlen + 6 + 30 + strlen(nodename) + 10;
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h->tname = jnlib_malloc (tnamelen + 1);
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if (!h->tname)
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{
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all_lockfiles = h->next;
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jnlib_free (h);
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return NULL;
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}
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h->nodename_len = strlen (nodename);
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#ifndef __riscos__
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snprintf (h->tname, tnamelen, "%.*s/.#lk%p.", dirpartlen, dirpart, h );
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h->nodename_off = strlen (h->tname);
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snprintf (h->tname+h->nodename_off, tnamelen - h->nodename_off,
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"%s.%d", nodename, (int)getpid ());
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#else /* __riscos__ */
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snprintf (h->tname, tnamelen, "%.*s.lk%p/", dirpartlen, dirpart, h );
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h->nodename_off = strlen (h->tname);
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snprintf (h->tname+h->nodename_off, tnamelen - h->modename_off,
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"%s/%d", nodename, (int)getpid () );
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#endif /* __riscos__ */
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do
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{
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errno = 0;
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fd = open (h->tname, O_WRONLY|O_CREAT|O_EXCL,
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S_IRUSR|S_IRGRP|S_IROTH|S_IWUSR );
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}
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while (fd == -1 && errno == EINTR);
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if ( fd == -1 )
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{
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all_lockfiles = h->next;
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log_error (_("failed to create temporary file `%s': %s\n"),
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h->tname, strerror(errno));
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jnlib_free (h->tname);
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jnlib_free (h);
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return NULL;
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}
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if ( write (fd, pidstr, 11 ) != 11 )
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goto write_failed;
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if ( write (fd, nodename, strlen (nodename) ) != strlen (nodename) )
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goto write_failed;
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if ( write (fd, "\n", 1 ) != 1 )
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goto write_failed;
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if ( close (fd) )
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goto write_failed;
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# ifdef _REENTRANT
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/* release mutex */
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# endif
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h->lockname = jnlib_malloc ( strlen (file_to_lock) + 6 );
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if (!h->lockname)
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{
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all_lockfiles = h->next;
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unlink (h->tname);
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jnlib_free (h->tname);
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jnlib_free (h);
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return NULL;
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}
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strcpy (stpcpy (h->lockname, file_to_lock), EXTSEP_S "lock");
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return h;
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write_failed:
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all_lockfiles = h->next;
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# ifdef _REENTRANT
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/* fixme: release mutex */
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# endif
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log_error ( _("error writing to `%s': %s\n"), h->tname, strerror(errno) );
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close (fd);
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unlink (h->tname);
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jnlib_free (h->tname);
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jnlib_free (h);
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return NULL;
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#else /* HAVE_DOSISH_SYSTEM */
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/* The Windows version does not need a temporary file but uses the
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plain lock file along with record locking. We create this file
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here so that we later do only need to do the file locking. For
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error reporting it is useful to keep the name of the file in the
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handle. */
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h->next = all_lockfiles;
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all_lockfiles = h;
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h->lockname = jnlib_malloc ( strlen (file_to_lock) + 6 );
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if (!h->lockname)
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{
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all_lockfiles = h->next;
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jnlib_free (h);
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return NULL;
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}
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strcpy (stpcpy(h->lockname, file_to_lock), EXTSEP_S "lock");
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/* If would be nice if we would use the FILE_FLAG_DELETE_ON_CLOSE
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along with FILE_SHARE_DELETE but that does not work due to a race
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condition: Despite the OPEN_ALWAYS flag CreateFile may return an
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error and we can't reliable create/open the lock file unless we
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would wait here until it works - however there are other valid
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reasons why a lock file can't be created and thus the process
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would not stop as expected but spin til until Windows crashes.
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Our solution is to keep the lock file open; that does not
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harm. */
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h->lockhd = CreateFile (h->lockname,
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GENERIC_READ|GENERIC_WRITE,
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FILE_SHARE_READ|FILE_SHARE_WRITE,
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NULL, OPEN_ALWAYS, 0, NULL);
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if (h->lockhd == INVALID_HANDLE_VALUE)
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{
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log_error (_("can't create `%s': %s\n"), h->lockname, w32_strerror (-1));
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all_lockfiles = h->next;
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jnlib_free (h->lockname);
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jnlib_free (h);
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return NULL;
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}
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return h;
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#endif /* HAVE_DOSISH_SYSTEM */
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}
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/* Destroy the local handle H and release the lock. */
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void
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destroy_dotlock ( DOTLOCK h )
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{
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DOTLOCK hprev, htmp;
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if ( !h )
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return;
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/* First remove the handle from our global list of all locks. */
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for (hprev=NULL, htmp=all_lockfiles; htmp; hprev=htmp, htmp=htmp->next)
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if (htmp == h)
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{
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if (hprev)
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hprev->next = htmp->next;
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else
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all_lockfiles = htmp->next;
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h->next = NULL;
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break;
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}
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/* Then destroy the lock. */
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if (!h->disable)
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{
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#ifdef HAVE_DOSISH_SYSTEM
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if (h->locked)
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{
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UnlockFile (h->lockhd, 0, 0, 1, 0);
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}
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CloseHandle (h->lockhd);
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#else /* !HAVE_DOSISH_SYSTEM */
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if (h->locked && h->lockname)
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unlink (h->lockname);
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if (h->tname)
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unlink (h->tname);
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jnlib_free (h->tname);
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#endif /* HAVE_DOSISH_SYSTEM */
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jnlib_free (h->lockname);
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}
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jnlib_free(h);
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}
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#ifndef HAVE_DOSISH_SYSTEM
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static int
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maybe_deadlock( DOTLOCK h )
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{
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DOTLOCK r;
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for ( r=all_lockfiles; r; r = r->next )
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{
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if ( r != h && r->locked )
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return 1;
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}
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return 0;
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}
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#endif /*!HAVE_DOSISH_SYSTEM*/
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/* Do a lock on H. A TIMEOUT of 0 returns immediately, -1 waits
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forever (hopefully not), other values are reserved (should then be
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timeouts in milliseconds). Returns: 0 on success */
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int
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make_dotlock ( DOTLOCK h, long timeout )
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{
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int backoff = 0;
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#ifndef HAVE_DOSISH_SYSTEM
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int pid;
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const char *maybe_dead="";
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int same_node;
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#endif /*!HAVE_DOSISH_SYSTEM*/
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if ( h->disable )
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return 0; /* Locks are completely disabled. Return success. */
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if ( h->locked )
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{
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#ifndef __riscos__
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log_debug ("Oops, `%s' is already locked\n", h->lockname);
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#endif /* !__riscos__ */
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return 0;
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}
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for (;;)
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{
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#ifndef HAVE_DOSISH_SYSTEM
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# ifndef __riscos__
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if ( !link(h->tname, h->lockname) )
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{
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/* fixme: better use stat to check the link count */
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h->locked = 1;
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return 0; /* okay */
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}
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if ( errno != EEXIST )
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{
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log_error ( "lock not made: link() failed: %s\n", strerror(errno) );
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return -1;
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}
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# else /* __riscos__ */
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if ( !renamefile(h->tname, h->lockname) )
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{
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h->locked = 1;
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return 0; /* okay */
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}
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if ( errno != EEXIST )
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{
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log_error( "lock not made: rename() failed: %s\n", strerror(errno) );
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return -1;
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}
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# endif /* __riscos__ */
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if ( (pid = read_lockfile (h, &same_node)) == -1 )
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{
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if ( errno != ENOENT )
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{
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log_info ("cannot read lockfile\n");
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return -1;
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}
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log_info( "lockfile disappeared\n");
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continue;
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}
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else if ( pid == getpid() && same_node )
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{
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log_info( "Oops: lock already held by us\n");
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h->locked = 1;
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return 0; /* okay */
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}
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else if ( same_node && kill (pid, 0) && errno == ESRCH )
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{
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# ifndef __riscos__
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log_info (_("removing stale lockfile (created by %d)\n"), pid );
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unlink (h->lockname);
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continue;
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# else /* __riscos__ */
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/* Under RISCOS we are *pretty* sure that the other task
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is dead and therefore we remove the stale lock file. */
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maybe_dead = _(" - probably dead - removing lock");
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unlink(h->lockname);
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# endif /* __riscos__ */
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}
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if ( timeout == -1 )
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{
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/* Wait until lock has been released. */
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struct timeval tv;
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log_info (_("waiting for lock (held by %d%s) %s...\n"),
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pid, maybe_dead, maybe_deadlock(h)? _("(deadlock?) "):"");
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/* We can't use sleep, cause signals may be blocked. */
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tv.tv_sec = 1 + backoff;
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tv.tv_usec = 0;
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select(0, NULL, NULL, NULL, &tv);
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if ( backoff < 10 )
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backoff++ ;
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}
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else
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return -1;
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#else /*HAVE_DOSISH_SYSTEM*/
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int w32err;
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if (LockFile (h->lockhd, 0, 0, 1, 0))
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{
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h->locked = 1;
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return 0; /* okay */
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}
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w32err = GetLastError ();
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if (w32err != ERROR_LOCK_VIOLATION)
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{
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log_error (_("lock `%s' not made: %s\n"),
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h->lockname, w32_strerror (w32err));
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return -1;
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}
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if ( timeout == -1 )
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{
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/* Wait until lock has been released. */
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log_info (_("waiting for lock %s...\n"), h->lockname);
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Sleep ((1 + backoff)*1000);
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if ( backoff < 10 )
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backoff++ ;
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}
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else
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return -1;
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#endif /*HAVE_DOSISH_SYSTEM*/
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}
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/*NOTREACHED*/
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}
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/* Release a lock. Returns 0 on success. */
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int
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release_dotlock( DOTLOCK h )
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{
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/* To avoid atexit race conditions we first check whether there are
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any locks left. It might happen that another atexit handler
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tries to release the lock while the atexit handler of this module
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already ran and thus H is undefined. */
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if (!all_lockfiles)
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return 0;
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if ( h->disable )
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return 0;
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if ( !h->locked )
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{
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log_debug("Oops, `%s' is not locked\n", h->lockname);
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return 0;
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}
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#ifdef HAVE_DOSISH_SYSTEM
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if (!UnlockFile (h->lockhd, 0, 0, 1, 0))
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{
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log_error ("release_dotlock: error removing lockfile `%s': %s\n",
|
||
h->lockname, w32_strerror (-1));
|
||
return -1;
|
||
}
|
||
#else
|
||
int pid, same_node;
|
||
|
||
pid = read_lockfile (h, &same_node);
|
||
if ( pid == -1 )
|
||
{
|
||
log_error( "release_dotlock: lockfile error\n");
|
||
return -1;
|
||
}
|
||
if ( pid != getpid() || !same_node )
|
||
{
|
||
log_error( "release_dotlock: not our lock (pid=%d)\n", pid);
|
||
return -1;
|
||
}
|
||
|
||
#ifndef __riscos__
|
||
if ( unlink( h->lockname ) )
|
||
{
|
||
log_error ("release_dotlock: error removing lockfile `%s'\n",
|
||
h->lockname);
|
||
return -1;
|
||
}
|
||
/* Fixme: As an extra check we could check whether the link count is
|
||
now really at 1. */
|
||
#else /* __riscos__ */
|
||
if ( renamefile (h->lockname, h->tname) )
|
||
{
|
||
log_error ("release_dotlock: error renaming lockfile `%s' to `%s'\n",
|
||
h->lockname, h->tname);
|
||
return -1;
|
||
}
|
||
#endif /* __riscos__ */
|
||
|
||
#endif /* !HAVE_DOSISH_SYSTEM */
|
||
h->locked = 0;
|
||
return 0;
|
||
}
|
||
|
||
|
||
/* Read the lock file and return the pid, returns -1 on error. True
|
||
will be stored in the integer at address SAME_NODE if the lock file
|
||
has been created on the same node. */
|
||
#ifndef HAVE_DOSISH_SYSTEM
|
||
static int
|
||
read_lockfile (DOTLOCK h, int *same_node )
|
||
{
|
||
char buffer_space[10+1+70+1]; /* 70 is just an estimated value; node
|
||
name are usually shorter. */
|
||
int fd;
|
||
int pid = -1;
|
||
char *buffer, *p;
|
||
size_t expected_len;
|
||
int res, nread;
|
||
|
||
*same_node = 0;
|
||
expected_len = 10 + 1 + h->nodename_len + 1;
|
||
if ( expected_len >= sizeof buffer_space)
|
||
buffer = jnlib_xmalloc (expected_len);
|
||
else
|
||
buffer = buffer_space;
|
||
|
||
if ( (fd = open (h->lockname, O_RDONLY)) == -1 )
|
||
{
|
||
int e = errno;
|
||
log_info ("error opening lockfile `%s': %s\n",
|
||
h->lockname, strerror(errno) );
|
||
if (buffer != buffer_space)
|
||
jnlib_free (buffer);
|
||
errno = e; /* Need to return ERRNO here. */
|
||
return -1;
|
||
}
|
||
|
||
p = buffer;
|
||
nread = 0;
|
||
do
|
||
{
|
||
res = read (fd, p, expected_len - nread);
|
||
if (res == -1 && errno == EINTR)
|
||
continue;
|
||
if (res < 0)
|
||
{
|
||
log_info ("error reading lockfile `%s'", h->lockname );
|
||
close (fd);
|
||
if (buffer != buffer_space)
|
||
jnlib_free (buffer);
|
||
errno = 0; /* Do not return an inappropriate ERRNO. */
|
||
return -1;
|
||
}
|
||
p += res;
|
||
nread += res;
|
||
}
|
||
while (res && nread != expected_len);
|
||
close(fd);
|
||
|
||
if (nread < 11)
|
||
{
|
||
log_info ("invalid size of lockfile `%s'", h->lockname );
|
||
if (buffer != buffer_space)
|
||
jnlib_free (buffer);
|
||
errno = 0; /* Better don't return an inappropriate ERRNO. */
|
||
return -1;
|
||
}
|
||
|
||
if (buffer[10] != '\n'
|
||
|| (buffer[10] = 0, pid = atoi (buffer)) == -1
|
||
#ifndef __riscos__
|
||
|| !pid
|
||
#else /* __riscos__ */
|
||
|| (!pid && riscos_getpid())
|
||
#endif /* __riscos__ */
|
||
)
|
||
{
|
||
log_error ("invalid pid %d in lockfile `%s'", pid, h->lockname );
|
||
if (buffer != buffer_space)
|
||
jnlib_free (buffer);
|
||
errno = 0;
|
||
return -1;
|
||
}
|
||
|
||
if (nread == expected_len
|
||
&& !memcmp (h->tname+h->nodename_off, buffer+11, h->nodename_len)
|
||
&& buffer[11+h->nodename_len] == '\n')
|
||
*same_node = 1;
|
||
|
||
if (buffer != buffer_space)
|
||
jnlib_free (buffer);
|
||
return pid;
|
||
}
|
||
#endif /* !HAVE_DOSISH_SYSTEM */
|
||
|
||
|
||
/* Remove all lockfiles. This is usually called by the atexit handler
|
||
installed by this module but may also be called by other
|
||
termination handlers. */
|
||
void
|
||
dotlock_remove_lockfiles()
|
||
{
|
||
DOTLOCK h, h2;
|
||
|
||
h = all_lockfiles;
|
||
all_lockfiles = NULL;
|
||
|
||
while ( h )
|
||
{
|
||
h2 = h->next;
|
||
destroy_dotlock (h);
|
||
h = h2;
|
||
}
|
||
}
|
||
|