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1 /* MasqMail
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2 Copyright (C) 2001 Oliver Kurth
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3
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4 This program is free software; you can redistribute it and/or modify
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5 it under the terms of the GNU General Public License as published by
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6 the Free Software Foundation; either version 2 of the License, or
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7 (at your option) any later version.
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8
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9 This program is distributed in the hope that it will be useful,
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 GNU General Public License for more details.
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13
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14 You should have received a copy of the GNU General Public License
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15 along with this program; if not, write to the Free Software
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16 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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17 */
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18
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19 #include <glib.h>
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20 #include <unistd.h>
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21 #include <fcntl.h>
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22 #include <sys/stat.h>
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23 #include <sys/types.h>
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24 #include <syslog.h>
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25 #include <errno.h>
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26 #include <string.h>
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27 #include <time.h>
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28
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29 #include "masqmail.h"
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30 #include "dotlock.h"
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31
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32 gboolean
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33 dot_lock(gchar * lock_name, gchar * hitch_name)
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34 {
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35 gboolean ok = FALSE;
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36 int fd;
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37
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38 fd = open(hitch_name, O_WRONLY | O_CREAT | O_EXCL, 0);
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39 if (fd != -1) {
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40 struct stat stat_buf;
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41
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42 close(fd);
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43 link(hitch_name, lock_name);
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44 if (stat(hitch_name, &stat_buf) == 0) {
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45 if (stat_buf.st_nlink == 2) {
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46 unlink(hitch_name);
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47 ok = TRUE;
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48 } else {
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49 if (stat(lock_name, &stat_buf) == 0) {
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50 if ((time(NULL) - stat_buf.st_mtime) > MAX_LOCKAGE) {
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51 /* remove lock if uncredibly old */
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52 unlink(lock_name);
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53
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54 link(hitch_name, lock_name);
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55 if (stat(hitch_name, &stat_buf) == 0) {
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56 if (stat_buf.st_nlink == 2) {
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57 unlink(hitch_name);
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58 ok = TRUE;
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59 }
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60 }
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61 }
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62 }
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63 }
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64 }
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65 if (!ok) {
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66 unlink(hitch_name);
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67 }
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68 } else
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69 logwrite(LOG_WARNING, "could not create lock file %s: %s\n", lock_name, strerror(errno));
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70
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71 return ok;
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72 }
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73
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74 gboolean
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75 dot_unlock(gchar * lock_name)
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76 {
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77 unlink(lock_name);
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78
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79 return TRUE;
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80 }
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