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1 /* rename.c -- BSD compatible directory function for System V |
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2 Copyright (C) 1988, 1990 Free Software Foundation, Inc. |
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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, or (at your option) |
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7 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 USA. */ |
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17 |
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18 #ifdef HAVE_CONFIG_H |
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19 #include <config.h> |
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20 #endif |
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21 |
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22 #ifndef HAVE_RENAME |
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23 |
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2443
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24 #ifdef HAVE_SYS_TYPES_H |
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25 #include <sys/types.h> |
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2443
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26 #endif |
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27 #include <sys/stat.h> |
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28 #include <errno.h> |
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29 #ifndef errno |
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30 extern int errno; |
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31 #endif |
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32 |
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33 #ifdef STAT_MACROS_BROKEN |
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34 #undef S_ISDIR |
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35 #endif /* STAT_MACROS_BROKEN. */ |
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36 |
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37 #if !defined(S_ISDIR) && defined(S_IFDIR) |
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38 #define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR) |
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39 #endif |
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40 |
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41 #include "safe-stat.h" |
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42 |
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43 /* Rename file FROM to file TO. |
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44 Return 0 if successful, -1 if not. */ |
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45 |
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46 int |
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47 rename (from, to) |
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48 char *from; |
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49 char *to; |
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50 { |
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51 struct stat from_stats, to_stats; |
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52 int pid, status; |
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53 |
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54 if (SAFE_STAT (from, &from_stats)) |
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55 return -1; |
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56 |
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57 /* Be careful not to unlink `from' if it happens to be equal to `to' or |
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58 (on filesystems that silently truncate filenames after 14 characters) |
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59 if `from' and `to' share the significant characters. */ |
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60 if (SAFE_STAT (to, &to_stats)) |
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61 { |
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62 if (errno != ENOENT) |
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63 return -1; |
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64 } |
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65 else |
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66 { |
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67 if ((from_stats.st_dev == to_stats.st_dev) |
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68 && (from_stats.st_ino == to_stats.st_dev)) |
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69 /* `from' and `to' designate the same file on that filesystem. */ |
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70 return 0; |
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71 |
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72 if (unlink (to) && errno != ENOENT) |
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73 return -1; |
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74 } |
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75 |
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76 if (S_ISDIR (from_stats.st_mode)) |
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77 { |
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78 /* Need a setuid root process to link and unlink directories. */ |
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79 pid = fork (); |
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80 switch (pid) |
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81 { |
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82 case -1: /* Error. */ |
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83 error (1, errno, "cannot fork"); |
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84 |
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85 case 0: /* Child. */ |
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86 execl (MVDIR, "mvdir", from, to, (char *) 0); |
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87 error (255, errno, "cannot run `%s'", MVDIR); |
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88 |
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89 default: /* Parent. */ |
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90 while (wait (&status) != pid) |
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91 /* Do nothing. */ ; |
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92 |
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93 errno = 0; /* mvdir printed the system error message. */ |
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94 if (status) |
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95 return -1; |
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96 } |
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97 } |
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98 else |
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99 { |
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100 if (link (from, to)) |
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101 return -1; |
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102 if (unlink (from) && errno != ENOENT) |
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103 { |
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104 unlink (to); |
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105 return -1; |
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106 } |
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107 } |
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108 return 0; |
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109 } |
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110 |
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111 #endif |
