1 /* MasqMail

2 Copyright (C) 2001 Oliver Kurth

3

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

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

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

7 (at your option) any later version.

8

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

10 but WITHOUT ANY WARRANTY; without even the implied warranty of

11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

12 GNU General Public License for more details.

13

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

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

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

17 */

18

19 #include <glib.h>

20 #include <unistd.h>

21 #include <fcntl.h>

22 #include <sys/stat.h>

23 #include <sys/types.h>

24 #include <syslog.h>

25 #include <errno.h>

26 #include <string.h>

27 #include <time.h>

28

29 #include "masqmail.h"

30 #include "dotlock.h"

31

32 gboolean

33 dot_lock(gchar * lock_name, gchar * hitch_name)

34 {

35 gboolean ok = FALSE;

36 int fd;

37

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

39 if (fd != -1) {

40 struct stat stat_buf;

41

42 close(fd);

43 link(hitch_name, lock_name);

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

45 if (stat_buf.st_nlink == 2) {

46 unlink(hitch_name);

47 ok = TRUE;

48 } else {

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

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

51 /* remove lock if uncredibly old */

52 unlink(lock_name);

53

54 link(hitch_name, lock_name);

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

56 if (stat_buf.st_nlink == 2) {

57 unlink(hitch_name);

58 ok = TRUE;

59 }

60 }

61 }

62 }

63 }

64 }

65 if (!ok) {

66 unlink(hitch_name);

67 }

68 } else

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

70

71 return ok;

72 }

73

74 gboolean

75 dot_unlock(gchar * lock_name)

76 {

77 unlink(lock_name);

78

79 return TRUE;

80 }