113 lines
2.8 KiB
C
113 lines
2.8 KiB
C
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/* BSD compatible rename and directory rename function for System V.
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Copyright (C) 1988, 1990 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#if HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <errno.h>
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#ifndef errno
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extern int errno;
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#endif
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#if STAT_MACROS_BROKEN
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# undef S_ISDIR
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#endif
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#if !defined(S_ISDIR) && defined(S_IFDIR)
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# define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
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#endif
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/* Rename file FROM to file TO.
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Return 0 if successful, -1 if not. */
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int
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rename (from, to)
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char *from;
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char *to;
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{
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struct stat from_stats, to_stats;
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int pid, status;
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if (stat (from, &from_stats))
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return -1;
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/* Be careful not to unlink `from' if it happens to be equal to `to' or
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(on filesystems that silently truncate filenames after 14 characters)
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if `from' and `to' share the significant characters. */
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if (stat (to, &to_stats))
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{
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if (errno != ENOENT)
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return -1;
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}
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else
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{
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if ((from_stats.st_dev == to_stats.st_dev)
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&& (from_stats.st_ino == to_stats.st_ino))
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/* `from' and `to' designate the same file on that filesystem. */
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return 0;
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if (unlink (to) && errno != ENOENT)
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return -1;
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}
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#ifdef MVDIR
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/* If MVDIR is defined, it should be the full filename of a setuid root
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program able to link and unlink directories. If MVDIR is not defined,
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then the capability of renaming directories may be missing. */
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if (S_ISDIR (from_stats.st_mode))
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{
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/* Need a setuid root process to link and unlink directories. */
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pid = fork ();
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switch (pid)
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{
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case -1: /* Error. */
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error (1, errno, "cannot fork");
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case 0: /* Child. */
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execl (MVDIR, "mvdir", from, to, (char *) 0);
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error (255, errno, "cannot run `%s'", MVDIR);
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default: /* Parent. */
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while (wait (&status) != pid)
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/* Do nothing. */ ;
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errno = 0; /* mvdir printed the system error message. */
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if (status)
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return -1;
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}
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}
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else
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#endif /* MVDIR */
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{
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if (link (from, to))
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return -1;
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if (unlink (from) && errno != ENOENT)
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{
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unlink (to);
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return -1;
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}
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}
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return 0;
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}
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