/* $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; }