Mercurial > trustbridge
annotate common/linuxlockfile.c @ 1281:4c200e512f76
(admin-help) Create list button (screenshot) updated.
author | Emanuel Schuetze <emanuel@intevation.de> |
---|---|
date | Mon, 29 Sep 2014 11:47:14 +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 */ |