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lock.c - dedup - deduplicating backup program |
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git clone git://bitreich.org/dedup/ git://enlrupgkhuxnvlhsf6lc3fziv5h2hhfrinws65d7roiv6bfj7d652fid.onion/dedup/ (git://bitreich.org) |
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README |
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LICENSE |
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--- |
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lock.c (686B) |
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--- |
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1 #include <fcntl.h> |
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2 #include <limits.h> |
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3 #include <stdio.h> |
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4 #include <unistd.h> |
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5 |
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6 int |
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7 lockrepo(char *repo) |
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8 { |
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9 char path[PATH_MAX]; |
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10 struct flock fl; |
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11 int fd; |
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12 |
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13 if (snprintf(path, sizeof(path), "%s/lock", repo) >= |
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14 sizeof(path)) |
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15 return -1; |
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16 |
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17 fd = open(path, O_RDWR | O_CREAT, 0600); |
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18 if (fd < 0) |
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19 return -1; |
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20 fl.l_type = F_WRLCK; |
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21 fl.l_whence = SEEK_SET; |
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22 fl.l_start = 0; |
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23 fl.l_len = 0; |
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24 if (fcntl(fd, F_SETLK, &fl) < 0) { |
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25 close(fd); |
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26 return -1; |
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27 } |
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28 return fd; |
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29 } |
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30 |
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31 int |
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32 unlockrepo(int fd) |
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33 { |
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34 struct flock fl; |
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35 |
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36 fl.l_type = F_UNLCK; |
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37 fl.l_whence = SEEK_SET; |
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38 fl.l_start = 0; |
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39 fl.l_len = 0; |
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40 if (fcntl(fd, F_SETLK, &fl) < 0) |
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41 return -1; |
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42 if (close(fd) < 0) |
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43 return -1; |
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44 return 0; |
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45 } |
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