1 /*

2 ** MasqMail

3 ** Copyright (C) 2001 Oliver Kurth

4 **

5 ** This program is free software; you can redistribute it and/or modify

6 ** it under the terms of the GNU General Public License as published by

7 ** the Free Software Foundation; either version 2 of the License, or

8 ** (at your option) any later version.

9 **

10 ** This program is distributed in the hope that it will be useful,

11 ** but WITHOUT ANY WARRANTY; without even the implied warranty of

12 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

13 ** GNU General Public License for more details.

14 **

15 ** You should have received a copy of the GNU General Public License

16 ** along with this program; if not, write to the Free Software

17 ** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

18 */

19

20 #include <glib.h>

21 #include <unistd.h>

22 #include <fcntl.h>

23 #include <sys/stat.h>

24 #include <sys/types.h>

25 #include <syslog.h>

26 #include <errno.h>

27 #include <string.h>

28 #include <time.h>

29

30 #include "masqmail.h"

31 #include "dotlock.h"

32

33 gboolean

34 dot_lock(gchar *lock_name, gchar *hitch_name)

35 {

36 gboolean ok = FALSE;

37 int fd;

38

39 fd = open(hitch_name, O_WRONLY | O_CREAT | O_EXCL, 0);

40 if (fd != -1) {

41 struct stat stat_buf;

42

43 close(fd);

44 link(hitch_name, lock_name);

45 if (stat(hitch_name, &stat_buf) == 0) {

46 if (stat_buf.st_nlink == 2) {

47 unlink(hitch_name);

48 ok = TRUE;

49 } else {

50 if (stat(lock_name, &stat_buf) == 0) {

51 if ((time(NULL) - stat_buf.st_mtime) > MAX_LOCKAGE) {

52 /* remove lock if uncredibly old */

53 unlink(lock_name);

54

55 link(hitch_name, lock_name);

56 if (stat(hitch_name, &stat_buf) == 0) {

57 if (stat_buf.st_nlink == 2) {

58 unlink(hitch_name);

59 ok = TRUE;

60 }

61 }

62 }

63 }

64 }

65 }

66 if (!ok) {

67 unlink(hitch_name);

68 }

69 } else

70 logwrite(LOG_WARNING, "could not create lock file %s: %s\n", lock_name, strerror(errno));

71

72 return ok;

73 }

74

75 gboolean

76 dot_unlock(gchar *lock_name)

77 {

78 unlink(lock_name);

79

80 return TRUE;

81 }