Mercurial > trustbridge

annotate common/linuxlockfile.c @ 1306:845048d4a69f

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
(issue159) Use user specific appdata directory for nss list with simple rights. Using the ProgramData folder with resticted access rights failed in case the process was not elevated.
author Andre Heinecke <andre.heinecke@intevation.de>
date Mon, 13 Oct 2014 12:31:37 +0200
parents 7ea3a4c0e2ae
children 8362e30f7b55
rev   line source
1160
a974b61a5cce (issue108) Add missing license headers
Andre Heinecke <andre.heinecke@intevation.de>
parents: 782
diff changeset
1 /* Copyright (C) 2014 by Bundesamt für Sicherheit in der Informationstechnik
a974b61a5cce (issue108) Add missing license headers
Andre Heinecke <andre.heinecke@intevation.de>
parents: 782
diff changeset
2 * Software engineering by Intevation GmbH
a974b61a5cce (issue108) Add missing license headers
Andre Heinecke <andre.heinecke@intevation.de>
parents: 782
diff changeset
3 *
a974b61a5cce (issue108) Add missing license headers
Andre Heinecke <andre.heinecke@intevation.de>
parents: 782
diff changeset
4 * This file is Free Software under the GNU GPL (v>=2)
a974b61a5cce (issue108) Add missing license headers
Andre Heinecke <andre.heinecke@intevation.de>
parents: 782
diff changeset
5 * and comes with ABSOLUTELY NO WARRANTY!
a974b61a5cce (issue108) Add missing license headers
Andre Heinecke <andre.heinecke@intevation.de>
parents: 782
diff changeset
6 * See LICENSE.txt for details.
a974b61a5cce (issue108) Add missing license headers
Andre Heinecke <andre.heinecke@intevation.de>
parents: 782
diff changeset
7 */
a974b61a5cce (issue108) Add missing license headers
Andre Heinecke <andre.heinecke@intevation.de>
parents: 782
diff changeset
8
782
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
9 #ifndef WIN32
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
10
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
11 #include <fcntl.h>
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
12 #include <stdio.h>
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
13 #include <sys/types.h>
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
14 #include <unistd.h>
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
15
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
16 #include "logging.h"
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
17
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
18 int
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
19 open_lockfile(char *path)
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
20 {
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
21 int fd;
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
22 char pidstr[20];
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
23 size_t pidstrlen;
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
24 struct flock lk;
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
25 fd = open(path, O_RDWR | O_CREAT, 0600);
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
26 if (fd != -1)
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
27 {
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
28 /* Get an exclusive lock on the whole file. */
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
29 lk.l_type = F_WRLCK;
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
30 lk.l_whence = SEEK_SET;
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
31 lk.l_start = 0;
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
32 lk.l_len = 0;
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
33 if (fcntl(fd, F_SETLK, &lk) != -1)
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
34 {
1162
2a1206932f53 (issue107) Comment all TODO's and FIXME's with issues as documented in issue107
Andre Heinecke <andre.heinecke@intevation.de>
parents: 1160
diff changeset
35 /* FIXME (issue139): For extra security we should check if there is
782
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
36 already a pid in the file. If so we should check in
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
37 /proc/$PID if there is still a process of the same name
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
38 as ours running... */
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
39 ftruncate(fd, 0);
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
40 pidstrlen = (size_t)snprintf(pidstr, sizeof(pidstr), "%d", getpid());
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
41 write(fd, pidstr, pidstrlen);
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
42 }
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
43 else
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
44 {
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
45 /* Lock can not be acquired. Bail out... */
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
46 close(fd);
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
47 DEBUGPRINTF("Could not get an exclusive lock on %s.\n", path);
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
48 return -1;
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
49 }
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
50 }
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
51 else
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
52 {
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
53 DEBUGPRINTF("Failed to open lock file: %s.\n", path);
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
54 }
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
55 return fd;
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
56 }
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
57
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
58 void
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
59 close_lockfile(int fd)
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
60 {
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
61 struct flock lk;
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
62
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
63 /* Delete the PID from file. */
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
64 /* We do this instead of trying to unlink the file. */
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
65 ftruncate(fd, 0);
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
66
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
67 /* Remove lock from the file. */
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
68 lk.l_type = F_UNLCK;
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
69 lk.l_whence = SEEK_SET;
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
70 lk.l_start = 0;
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
71 lk.l_len = 0;
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
72 if (fcntl(fd, F_SETLK, &lk) == -1)
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
73 {
1250
7ea3a4c0e2ae This should be serious software.
Andre Heinecke <andre.heinecke@intevation.de>
parents: 1162
diff changeset
74 /* Lock can not be removed */
7ea3a4c0e2ae This should be serious software.
Andre Heinecke <andre.heinecke@intevation.de>
parents: 1162
diff changeset
75 DEBUGPRINTF("Could not remove lock from pid file.\n");
782
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
76 }
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
77 close(fd);
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
78 }
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
79
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
80 #endif /* Not WIN32 */
http://wald.intevation.org/projects/trustbridge/