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annotate src/dotlock.c @ 209:10da50168dab

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replaced the MD5 implementation with the one of Solar Designer Until now, the sample code of RFC 1321 was used. It had an ugly license. Now we use the implementation of Solar Designer, which is in the Public Domain. http://openwall.info/wiki/people/solar/software/public-domain-source-code/md5
author meillo@marmaro.de
date Sun, 18 Jul 2010 21:58:15 +0200
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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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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79 return TRUE;
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80 }