masqmail
view src/dotlock.c @ 281:ea5f86e0a81c
modes are now enforced exclusive
Other MTAs (exim, postfix) are more relaxing, but as combinations
of exclusive modes are senseless we behave more obvious if we
fail early. This makes understanding the behavior easier too.
| author | markus schnalke <meillo@marmaro.de> |
|---|---|
| date | Tue, 07 Dec 2010 14:04:56 -0300 |
| parents | 08114f7dcc23 |
| children | 41958685480d |
line source
1 /* MasqMail
2 Copyright (C) 2001 Oliver Kurth
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
17 */
19 #include <glib.h>
20 #include <unistd.h>
21 #include <fcntl.h>
22 #include <sys/stat.h>
23 #include <sys/types.h>
24 #include <syslog.h>
25 #include <errno.h>
26 #include <string.h>
27 #include <time.h>
29 #include "masqmail.h"
30 #include "dotlock.h"
32 gboolean
33 dot_lock(gchar * lock_name, gchar * hitch_name)
34 {
35 gboolean ok = FALSE;
36 int fd;
38 fd = open(hitch_name, O_WRONLY | O_CREAT | O_EXCL, 0);
39 if (fd != -1) {
40 struct stat stat_buf;
42 close(fd);
43 link(hitch_name, lock_name);
44 if (stat(hitch_name, &stat_buf) == 0) {
45 if (stat_buf.st_nlink == 2) {
46 unlink(hitch_name);
47 ok = TRUE;
48 } else {
49 if (stat(lock_name, &stat_buf) == 0) {
50 if ((time(NULL) - stat_buf.st_mtime) > MAX_LOCKAGE) {
51 /* remove lock if uncredibly old */
52 unlink(lock_name);
54 link(hitch_name, lock_name);
55 if (stat(hitch_name, &stat_buf) == 0) {
56 if (stat_buf.st_nlink == 2) {
57 unlink(hitch_name);
58 ok = TRUE;
59 }
60 }
61 }
62 }
63 }
64 }
65 if (!ok) {
66 unlink(hitch_name);
67 }
68 } else
69 logwrite(LOG_WARNING, "could not create lock file %s: %s\n", lock_name, strerror(errno));
71 return ok;
72 }
74 gboolean
75 dot_unlock(gchar * lock_name)
76 {
77 unlink(lock_name);
79 return TRUE;
80 }