Mercurial > trustbridge

annotate common/linuxlockfile.c @ 828:95e14add5c50

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
(issue11) Check minium supported windows version
author Andre Heinecke <andre.heinecke@intevation.de>
date Thu, 24 Jul 2014 11:41:17 +0200
parents 20ca94680003
children a974b61a5cce
rev   line source
782
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
1 #ifndef WIN32
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
2
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
3 #include <fcntl.h>
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
4 #include <stdio.h>
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
5 #include <sys/types.h>
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
6 #include <unistd.h>
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
7
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
8 #include "logging.h"
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
9
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
10 int
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
11 open_lockfile(char *path)
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
12 {
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
13 int fd;
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
14 char pidstr[20];
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
15 size_t pidstrlen;
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
16 struct flock lk;
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
17 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
18 if (fd != -1)
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
19 {
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
20 /* 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
21 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
22 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
23 lk.l_start = 0;
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
24 lk.l_len = 0;
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
25 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
26 {
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
27 /* FIXME: For extra security we should check if there is
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
28 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
29 /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
30 as ours running... */
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
31 ftruncate(fd, 0);
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
32 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
33 write(fd, pidstr, pidstrlen);
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
34 }
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
35 else
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
36 {
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
37 /* 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
38 close(fd);
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
39 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
40 return -1;
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
41 }
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 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
46 }
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
47 return fd;
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
48 }
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 void
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
51 close_lockfile(int fd)
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 struct flock lk;
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 /* 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
56 /* 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
57 ftruncate(fd, 0);
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
58
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
59 /* 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
60 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
61 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
62 lk.l_start = 0;
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
63 lk.l_len = 0;
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
64 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
65 {
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
66 /* Lock can not be removed?!? WTF? */
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
67 DEBUGPRINTF("Could not remove lock from pid file. STRANGE!\n");
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
68 }
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
69 close(fd);
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
70 }
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
71
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
72 #endif /* Not WIN32 */
http://wald.intevation.org/projects/trustbridge/