IABSD.fr/xenocara/lib/libXau/AuLock.c

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• Author : matthieu
  Date : 2009-10-31 17:44:36
  Hash : a9500da2
  Message : Update to libXau 1.0.5

• lib/libXau/AuLock.c

• /* $Xorg: AuLock.c,v 1.4 2001/02/09 02:03:42 xorgcvs Exp $ */
  
  /*
  
  Copyright 1988, 1998  The Open Group
  
  Permission to use, copy, modify, distribute, and sell this software and its
  documentation for any purpose is hereby granted without fee, provided that
  the above copyright notice appear in all copies and that both that
  copyright notice and this permission notice appear in supporting
  documentation.
  
  The above copyright notice and this permission notice shall be included in
  all copies or substantial portions of the Software.
  
  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
  OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  
  Except as contained in this notice, the name of The Open Group shall not be
  used in advertising or otherwise to promote the sale, use or other dealings
  in this Software without prior written authorization from The Open Group.
  
  */
  /* $XFree86: xc/lib/Xau/AuLock.c,v 3.6 2002/05/31 18:45:43 dawes Exp $ */
  
  #ifdef HAVE_CONFIG_H
  #include <config.h>
  #endif
  #include <X11/Xauth.h>
  #include <X11/Xos.h>
  #include <sys/stat.h>
  #include <errno.h>
  #include <time.h>
  #define Time_t time_t
  #ifndef X_NOT_POSIX
  #include <unistd.h>
  #else
  #ifndef WIN32
  extern unsigned	sleep ();
  #else
  #include <X11/Xwindows.h>
  #define link rename
  #endif
  #endif
  #ifdef __UNIXOS2__
  #define link rename
  #endif
  
  int
  XauLockAuth (
  _Xconst char *file_name,
  int	retries,
  int	timeout,
  long	dead)
  {
      char	creat_name[1025], link_name[1025];
      struct stat	statb;
      Time_t	now;
      int		creat_fd = -1;
  
      if (strlen (file_name) > 1022)
  	return LOCK_ERROR;
      (void) strcpy (creat_name, file_name);
      (void) strcat (creat_name, "-c");
      (void) strcpy (link_name, file_name);
      (void) strcat (link_name, "-l");
      if (stat (creat_name, &statb) != -1) {
  	now = time ((Time_t *) 0);
  	/*
  	 * NFS may cause ctime to be before now, special
  	 * case a 0 deadtime to force lock removal
  	 */
  	if (dead == 0 || now - statb.st_ctime > dead) {
  	    (void) unlink (creat_name);
  	    (void) unlink (link_name);
  	}
      }
      
      while (retries > 0) {
  	if (creat_fd == -1) {
  	    creat_fd = open (creat_name, O_WRONLY | O_CREAT | O_EXCL, 0600);
  	    if (creat_fd == -1) {
  		if (errno != EACCES)
  		    return LOCK_ERROR;
  	    } else
  		(void) close (creat_fd);
  	}
  	if (creat_fd != -1) {
  #ifndef X_NOT_POSIX
  	    /* The file system may not support hard links, and pathconf should tell us that. */
  	    if (1 == pathconf(creat_name, _PC_LINK_MAX)) {
  		if (-1 == rename(creat_name, link_name)) {
  		    /* Is this good enough?  Perhaps we should retry.  TEST */
  		    return LOCK_ERROR;
  		} else {
  		    return LOCK_SUCCESS;
  		}
  	    } else {
  #endif
  	    	if (link (creat_name, link_name) != -1)
  		    return LOCK_SUCCESS;
  		if (errno == ENOENT) {
  		    creat_fd = -1;	/* force re-creat next time around */
  		    continue;
  	    	}
  	    	if (errno != EEXIST)
  		    return LOCK_ERROR;
  #ifndef X_NOT_POSIX
  	   }
  #endif
  	}
  	(void) sleep ((unsigned) timeout);
  	--retries;
      }
      return LOCK_TIMEOUT;
  }