annotate common/linuxlockfile.c @ 1362:c2b76c8a8b82

(issue177) Only install certificate lists which are newer
author Andre Heinecke <andre.heinecke@intevation.de>
date Wed, 19 Nov 2014 19:07:56 +0100
parents 5d7b1650de1f
children
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>
1332
8362e30f7b55 (issue139) Check that pid is not running if the lock can be aquired
Andre Heinecke <andre.heinecke@intevation.de>
parents: 1250
diff changeset
15 #include <string.h>
782
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
16
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
17 #include "logging.h"
1332
8362e30f7b55 (issue139) Check that pid is not running if the lock can be aquired
Andre Heinecke <andre.heinecke@intevation.de>
parents: 1250
diff changeset
18 #include "util.h"
8362e30f7b55 (issue139) Check that pid is not running if the lock can be aquired
Andre Heinecke <andre.heinecke@intevation.de>
parents: 1250
diff changeset
19 #include "strhelp.h"
782
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
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
22 open_lockfile(char *path)
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
23 {
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
24 int fd;
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
25 char pidstr[20];
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
26 size_t pidstrlen;
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
27 struct flock lk;
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
28 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
29 if (fd != -1)
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
30 {
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
31 /* 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
32 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
33 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
34 lk.l_start = 0;
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
35 lk.l_len = 0;
1332
8362e30f7b55 (issue139) Check that pid is not running if the lock can be aquired
Andre Heinecke <andre.heinecke@intevation.de>
parents: 1250
diff changeset
36 fcntl(fd, F_SETLK, &lk);
782
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
37 if (fcntl(fd, F_SETLK, &lk) != -1)
1332
8362e30f7b55 (issue139) Check that pid is not running if the lock can be aquired
Andre Heinecke <andre.heinecke@intevation.de>
parents: 1250
diff changeset
38 {
8362e30f7b55 (issue139) Check that pid is not running if the lock can be aquired
Andre Heinecke <andre.heinecke@intevation.de>
parents: 1250
diff changeset
39 char oldpid[20];
8362e30f7b55 (issue139) Check that pid is not running if the lock can be aquired
Andre Heinecke <andre.heinecke@intevation.de>
parents: 1250
diff changeset
40 FILE *f = fopen(path, "r");
8362e30f7b55 (issue139) Check that pid is not running if the lock can be aquired
Andre Heinecke <andre.heinecke@intevation.de>
parents: 1250
diff changeset
41 size_t bytes_read;
8362e30f7b55 (issue139) Check that pid is not running if the lock can be aquired
Andre Heinecke <andre.heinecke@intevation.de>
parents: 1250
diff changeset
42 if (f)
8362e30f7b55 (issue139) Check that pid is not running if the lock can be aquired
Andre Heinecke <andre.heinecke@intevation.de>
parents: 1250
diff changeset
43 {
8362e30f7b55 (issue139) Check that pid is not running if the lock can be aquired
Andre Heinecke <andre.heinecke@intevation.de>
parents: 1250
diff changeset
44 bytes_read = fread(oldpid, 1, sizeof(oldpid), f);
1333
5d7b1650de1f Fix pseudo resource leak in case another process is running.
Andre Heinecke <andre.heinecke@intevation.de>
parents: 1332
diff changeset
45 fclose(f);
1332
8362e30f7b55 (issue139) Check that pid is not running if the lock can be aquired
Andre Heinecke <andre.heinecke@intevation.de>
parents: 1250
diff changeset
46 if (bytes_read)
8362e30f7b55 (issue139) Check that pid is not running if the lock can be aquired
Andre Heinecke <andre.heinecke@intevation.de>
parents: 1250
diff changeset
47 {
8362e30f7b55 (issue139) Check that pid is not running if the lock can be aquired
Andre Heinecke <andre.heinecke@intevation.de>
parents: 1250
diff changeset
48 char *oldPath,
8362e30f7b55 (issue139) Check that pid is not running if the lock can be aquired
Andre Heinecke <andre.heinecke@intevation.de>
parents: 1250
diff changeset
49 *newPath;
8362e30f7b55 (issue139) Check that pid is not running if the lock can be aquired
Andre Heinecke <andre.heinecke@intevation.de>
parents: 1250
diff changeset
50 if (bytes_read == sizeof(oldpid))
8362e30f7b55 (issue139) Check that pid is not running if the lock can be aquired
Andre Heinecke <andre.heinecke@intevation.de>
parents: 1250
diff changeset
51 {
8362e30f7b55 (issue139) Check that pid is not running if the lock can be aquired
Andre Heinecke <andre.heinecke@intevation.de>
parents: 1250
diff changeset
52 ERRORPRINTF ("Bad information in pidfile\n");
8362e30f7b55 (issue139) Check that pid is not running if the lock can be aquired
Andre Heinecke <andre.heinecke@intevation.de>
parents: 1250
diff changeset
53 }
8362e30f7b55 (issue139) Check that pid is not running if the lock can be aquired
Andre Heinecke <andre.heinecke@intevation.de>
parents: 1250
diff changeset
54 else
8362e30f7b55 (issue139) Check that pid is not running if the lock can be aquired
Andre Heinecke <andre.heinecke@intevation.de>
parents: 1250
diff changeset
55 {
8362e30f7b55 (issue139) Check that pid is not running if the lock can be aquired
Andre Heinecke <andre.heinecke@intevation.de>
parents: 1250
diff changeset
56 oldpid[bytes_read] = '\0';
8362e30f7b55 (issue139) Check that pid is not running if the lock can be aquired
Andre Heinecke <andre.heinecke@intevation.de>
parents: 1250
diff changeset
57 oldPath = get_proc_install_dir(oldpid);
8362e30f7b55 (issue139) Check that pid is not running if the lock can be aquired
Andre Heinecke <andre.heinecke@intevation.de>
parents: 1250
diff changeset
58 newPath = get_install_dir();
8362e30f7b55 (issue139) Check that pid is not running if the lock can be aquired
Andre Heinecke <andre.heinecke@intevation.de>
parents: 1250
diff changeset
59 if (oldPath && newPath && strcmp(oldPath, newPath) == 0)
8362e30f7b55 (issue139) Check that pid is not running if the lock can be aquired
Andre Heinecke <andre.heinecke@intevation.de>
parents: 1250
diff changeset
60 {
8362e30f7b55 (issue139) Check that pid is not running if the lock can be aquired
Andre Heinecke <andre.heinecke@intevation.de>
parents: 1250
diff changeset
61 DEBUGPRINTF("Got lock but process from %s is still"
8362e30f7b55 (issue139) Check that pid is not running if the lock can be aquired
Andre Heinecke <andre.heinecke@intevation.de>
parents: 1250
diff changeset
62 "running.\n", oldPath);
8362e30f7b55 (issue139) Check that pid is not running if the lock can be aquired
Andre Heinecke <andre.heinecke@intevation.de>
parents: 1250
diff changeset
63 xfree(oldPath);
8362e30f7b55 (issue139) Check that pid is not running if the lock can be aquired
Andre Heinecke <andre.heinecke@intevation.de>
parents: 1250
diff changeset
64 xfree(newPath);
8362e30f7b55 (issue139) Check that pid is not running if the lock can be aquired
Andre Heinecke <andre.heinecke@intevation.de>
parents: 1250
diff changeset
65 return -1;
8362e30f7b55 (issue139) Check that pid is not running if the lock can be aquired
Andre Heinecke <andre.heinecke@intevation.de>
parents: 1250
diff changeset
66 }
8362e30f7b55 (issue139) Check that pid is not running if the lock can be aquired
Andre Heinecke <andre.heinecke@intevation.de>
parents: 1250
diff changeset
67 xfree(oldPath);
8362e30f7b55 (issue139) Check that pid is not running if the lock can be aquired
Andre Heinecke <andre.heinecke@intevation.de>
parents: 1250
diff changeset
68 xfree(newPath);
8362e30f7b55 (issue139) Check that pid is not running if the lock can be aquired
Andre Heinecke <andre.heinecke@intevation.de>
parents: 1250
diff changeset
69 }
8362e30f7b55 (issue139) Check that pid is not running if the lock can be aquired
Andre Heinecke <andre.heinecke@intevation.de>
parents: 1250
diff changeset
70 }
8362e30f7b55 (issue139) Check that pid is not running if the lock can be aquired
Andre Heinecke <andre.heinecke@intevation.de>
parents: 1250
diff changeset
71 }
8362e30f7b55 (issue139) Check that pid is not running if the lock can be aquired
Andre Heinecke <andre.heinecke@intevation.de>
parents: 1250
diff changeset
72
8362e30f7b55 (issue139) Check that pid is not running if the lock can be aquired
Andre Heinecke <andre.heinecke@intevation.de>
parents: 1250
diff changeset
73 ftruncate(fd, 0);
8362e30f7b55 (issue139) Check that pid is not running if the lock can be aquired
Andre Heinecke <andre.heinecke@intevation.de>
parents: 1250
diff changeset
74 pidstrlen = (size_t)snprintf(pidstr, sizeof(pidstr), "%d",
8362e30f7b55 (issue139) Check that pid is not running if the lock can be aquired
Andre Heinecke <andre.heinecke@intevation.de>
parents: 1250
diff changeset
75 getpid());
8362e30f7b55 (issue139) Check that pid is not running if the lock can be aquired
Andre Heinecke <andre.heinecke@intevation.de>
parents: 1250
diff changeset
76 write(fd, pidstr, pidstrlen);
8362e30f7b55 (issue139) Check that pid is not running if the lock can be aquired
Andre Heinecke <andre.heinecke@intevation.de>
parents: 1250
diff changeset
77 }
8362e30f7b55 (issue139) Check that pid is not running if the lock can be aquired
Andre Heinecke <andre.heinecke@intevation.de>
parents: 1250
diff changeset
78 else
8362e30f7b55 (issue139) Check that pid is not running if the lock can be aquired
Andre Heinecke <andre.heinecke@intevation.de>
parents: 1250
diff changeset
79 {
8362e30f7b55 (issue139) Check that pid is not running if the lock can be aquired
Andre Heinecke <andre.heinecke@intevation.de>
parents: 1250
diff changeset
80 /* Lock can not be acquired. Bail out... */
8362e30f7b55 (issue139) Check that pid is not running if the lock can be aquired
Andre Heinecke <andre.heinecke@intevation.de>
parents: 1250
diff changeset
81 close(fd);
8362e30f7b55 (issue139) Check that pid is not running if the lock can be aquired
Andre Heinecke <andre.heinecke@intevation.de>
parents: 1250
diff changeset
82 DEBUGPRINTF("Could not get an exclusive lock on %s.\n", path);
8362e30f7b55 (issue139) Check that pid is not running if the lock can be aquired
Andre Heinecke <andre.heinecke@intevation.de>
parents: 1250
diff changeset
83 return -1;
8362e30f7b55 (issue139) Check that pid is not running if the lock can be aquired
Andre Heinecke <andre.heinecke@intevation.de>
parents: 1250
diff changeset
84 }
782
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
85 }
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
86 else
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
87 {
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
88 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
89 }
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
90 return fd;
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
91 }
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
92
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
93 void
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
94 close_lockfile(int fd)
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
95 {
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
96 struct flock lk;
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
97
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
98 /* 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
99 /* 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
100 ftruncate(fd, 0);
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
101
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
102 /* 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
103 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
104 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
105 lk.l_start = 0;
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
106 lk.l_len = 0;
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
107 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
108 {
1250
7ea3a4c0e2ae This should be serious software.
Andre Heinecke <andre.heinecke@intevation.de>
parents: 1162
diff changeset
109 /* Lock can not be removed */
7ea3a4c0e2ae This should be serious software.
Andre Heinecke <andre.heinecke@intevation.de>
parents: 1162
diff changeset
110 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
111 }
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
112 close(fd);
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
113 }
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
114
20ca94680003 Implemented detection of running instance on linux using a lock file.
Sascha Wilde <wilde@intevation.de>
parents:
diff changeset
115 #endif /* Not WIN32 */

http://wald.intevation.org/projects/trustbridge/