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annotate common/linuxlockfile.c @ 1338:ba7e36306085

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(issue164) README updated.
author Emanuel Schuetze <emanuel@intevation.de>
date Thu, 16 Oct 2014 15:00:52 +0200
parents 5d7b1650de1f
children
rev   line source
1160
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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
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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 #include <string.h>
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16
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17 #include "logging.h"
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18 #include "util.h"
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19 #include "strhelp.h"
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20
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21 int
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22 open_lockfile(char *path)
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23 {
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24 int fd;
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25 char pidstr[20];
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26 size_t pidstrlen;
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27 struct flock lk;
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28 fd = open(path, O_RDWR | O_CREAT, 0600);
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29 if (fd != -1)
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30 {
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31 /* Get an exclusive lock on the whole file. */
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32 lk.l_type = F_WRLCK;
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33 lk.l_whence = SEEK_SET;
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34 lk.l_start = 0;
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35 lk.l_len = 0;
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36 fcntl(fd, F_SETLK, &lk);
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37 if (fcntl(fd, F_SETLK, &lk) != -1)
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38 {
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39 char oldpid[20];
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40 FILE *f = fopen(path, "r");
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41 size_t bytes_read;
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42 if (f)
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43 {
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44 bytes_read = fread(oldpid, 1, sizeof(oldpid), f);
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45 fclose(f);
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46 if (bytes_read)
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47 {
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48 char *oldPath,
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49 *newPath;
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50 if (bytes_read == sizeof(oldpid))
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51 {
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52 ERRORPRINTF ("Bad information in pidfile\n");
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53 }
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54 else
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55 {
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56 oldpid[bytes_read] = '\0';
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57 oldPath = get_proc_install_dir(oldpid);
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58 newPath = get_install_dir();
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59 if (oldPath && newPath && strcmp(oldPath, newPath) == 0)
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60 {
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61 DEBUGPRINTF("Got lock but process from %s is still"
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62 "running.\n", oldPath);
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63 xfree(oldPath);
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64 xfree(newPath);
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65 return -1;
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66 }
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67 xfree(oldPath);
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68 xfree(newPath);
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69 }
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70 }
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71 }
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72
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73 ftruncate(fd, 0);
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74 pidstrlen = (size_t)snprintf(pidstr, sizeof(pidstr), "%d",
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75 getpid());
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76 write(fd, pidstr, pidstrlen);
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77 }
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78 else
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79 {
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80 /* Lock can not be acquired. Bail out... */
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81 close(fd);
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82 DEBUGPRINTF("Could not get an exclusive lock on %s.\n", path);
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83 return -1;
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84 }
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85 }
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86 else
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87 {
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88 DEBUGPRINTF("Failed to open lock file: %s.\n", path);
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89 }
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90 return fd;
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91 }
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92
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93 void
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94 close_lockfile(int fd)
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95 {
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96 struct flock lk;
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97
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98 /* Delete the PID from file. */
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99 /* We do this instead of trying to unlink the file. */
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100 ftruncate(fd, 0);
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101
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102 /* Remove lock from the file. */
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103 lk.l_type = F_UNLCK;
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104 lk.l_whence = SEEK_SET;
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105 lk.l_start = 0;
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106 lk.l_len = 0;
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107 if (fcntl(fd, F_SETLK, &lk) == -1)
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108 {
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109 /* Lock can not be removed */
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110 DEBUGPRINTF("Could not remove lock from pid file.\n");
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111 }
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112 close(fd);
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113 }
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114
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115 #endif /* Not WIN32 */
http://wald.intevation.org/projects/trustbridge/