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annotate src/dotlock.c @ 281:ea5f86e0a81c

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modes are now enforced exclusive Other MTAs (exim, postfix) are more relaxing, but as combinations of exclusive modes are senseless we behave more obvious if we fail early. This makes understanding the behavior easier too.
author markus schnalke <meillo@marmaro.de>
date Tue, 07 Dec 2010 14:04:56 -0300
parents 26e34ae9a3e3
children 41958685480d
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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)
0
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34 {
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35 gboolean ok = FALSE;
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36 int fd;
0
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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;
0
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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 }