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