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comparison lib/rename.c @ 5:41c9d08b09d7

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Initial revision
author Jim Meyering <jim@meyering.net>
date Sat, 31 Oct 1992 20:42:48 +0000
parents
children 7d7e310c3270 349cc607da80
comparison
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4:9087e62f9efd 5:41c9d08b09d7
1 /* rename.c -- BSD compatible directory function for System V
2 Copyright (C) 1988, 1990 Free Software Foundation, Inc.
3
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2, or (at your option)
7 any later version.
8
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
13
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
17
18 #include <sys/types.h>
19 #include <sys/stat.h>
20 #include <errno.h>
21 #ifndef STDC_HEADERS
22 extern int errno;
23 #endif
24
25 #if !defined(S_ISDIR) && defined(S_IFDIR)
26 #define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
27 #endif
28
29 /* Rename file FROM to file TO.
30 Return 0 if successful, -1 if not. */
31
32 int
33 rename (from, to)
34 char *from;
35 char *to;
36 {
37 struct stat from_stats;
38 int pid, status;
39
40 if (stat (from, &from_stats))
41 return -1;
42
43 if (unlink (to) && errno != ENOENT)
44 return -1;
45
46 if (S_ISDIR (from_stats.st_mode))
47 {
48 /* Need a setuid root process to link and unlink directories. */
49 pid = fork ();
50 switch (pid)
51 {
52 case -1: /* Error. */
53 error (1, errno, "cannot fork");
54
55 case 0: /* Child. */
56 execl (MVDIR, "mvdir", from, to, (char *) 0);
57 error (255, errno, "cannot run `%s'", MVDIR);
58
59 default: /* Parent. */
60 while (wait (&status) != pid)
61 /* Do nothing. */ ;
62
63 errno = 0; /* mvdir printed the system error message. */
64 if (status)
65 return -1;
66 }
67 }
68 else
69 {
70 if (link (from, to))
71 return -1;
72 if (unlink (from) && errno != ENOENT)
73 {
74 unlink (to);
75 return -1;
76 }
77 }
78 return 0;
79 }