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annotate common/linuxlockfile.c @ 1331:8897c90b8166

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(issue108) Remove generate_cppcheck and cppcheck target This did not work correctly. It is better just to manually execute cppcheck on the files as it gives you more control over the options.
author Andre Heinecke <andre.heinecke@intevation.de>
date Wed, 15 Oct 2014 13:24:59 +0200
parents 7ea3a4c0e2ae
children 8362e30f7b55
rev   line source
1160
a974b61a5cce (issue108) Add missing license headers
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1 /* Copyright (C) 2014 by Bundesamt für Sicherheit in der Informationstechnik
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2 * Software engineering by Intevation GmbH
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3 *
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4 * This file is Free Software under the GNU GPL (v>=2)
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5 * and comes with ABSOLUTELY NO WARRANTY!
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6 * See LICENSE.txt for details.
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7 */
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8
782
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9 #ifndef WIN32
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10
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11 #include <fcntl.h>
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12 #include <stdio.h>
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13 #include <sys/types.h>
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14 #include <unistd.h>
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15
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16 #include "logging.h"
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17
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18 int
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19 open_lockfile(char *path)
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20 {
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21 int fd;
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22 char pidstr[20];
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23 size_t pidstrlen;
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24 struct flock lk;
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25 fd = open(path, O_RDWR | O_CREAT, 0600);
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26 if (fd != -1)
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27 {
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28 /* Get an exclusive lock on the whole file. */
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29 lk.l_type = F_WRLCK;
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30 lk.l_whence = SEEK_SET;
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31 lk.l_start = 0;
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32 lk.l_len = 0;
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33 if (fcntl(fd, F_SETLK, &lk) != -1)
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34 {
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35 /* FIXME (issue139): For extra security we should check if there is
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36 already a pid in the file. If so we should check in
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37 /proc/$PID if there is still a process of the same name
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38 as ours running... */
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39 ftruncate(fd, 0);
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40 pidstrlen = (size_t)snprintf(pidstr, sizeof(pidstr), "%d", getpid());
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41 write(fd, pidstr, pidstrlen);
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42 }
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43 else
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44 {
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45 /* Lock can not be acquired. Bail out... */
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46 close(fd);
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47 DEBUGPRINTF("Could not get an exclusive lock on %s.\n", path);
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48 return -1;
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49 }
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50 }
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51 else
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52 {
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53 DEBUGPRINTF("Failed to open lock file: %s.\n", path);
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54 }
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55 return fd;
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56 }
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57
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58 void
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59 close_lockfile(int fd)
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60 {
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61 struct flock lk;
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62
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63 /* Delete the PID from file. */
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64 /* We do this instead of trying to unlink the file. */
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65 ftruncate(fd, 0);
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66
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67 /* Remove lock from the file. */
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68 lk.l_type = F_UNLCK;
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69 lk.l_whence = SEEK_SET;
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70 lk.l_start = 0;
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71 lk.l_len = 0;
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72 if (fcntl(fd, F_SETLK, &lk) == -1)
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73 {
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74 /* Lock can not be removed */
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75 DEBUGPRINTF("Could not remove lock from pid file.\n");
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76 }
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77 close(fd);
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78 }
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79
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80 #endif /* Not WIN32 */
http://wald.intevation.org/projects/trustbridge/