home *** CD-ROM | disk | FTP | other *** search
- /* rename.c -- BSD compatible directory function for System V
- Copyright (C) 1988, 1990 Free Software Foundation, Inc.
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2, or (at your option)
- any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- #ifdef HAVE_CONFIG_H
- #include "config.h"
- #endif
-
- #include <sys/types.h>
- #include <sys/stat.h>
- #include <errno.h>
- #ifndef STDC_HEADERS
- extern int errno;
- #endif
-
- /* Rename file FROM to file TO.
- Return 0 if successful, -1 if not. */
-
- int
- rename (from, to)
- char *from;
- char *to;
- {
- struct stat from_stats;
- int pid, status;
-
- if (stat (from, &from_stats) == 0)
- {
- /* We don't check existence_error because the systems which need it
- have rename(). */
- if (unlink (to) && errno != ENOENT)
- return -1;
- if ((from_stats.st_mode & S_IFMT) == S_IFDIR)
- {
- #ifdef MVDIR
- /* I don't think MVDIR ever gets defined, but I don't think
- it matters, because I don't think CVS ever calls rename()
- on directories. */
-
- /* Need a setuid root process to link and unlink directories. */
- pid = fork ();
- switch (pid)
- {
- case -1: /* Error. */
- error (1, errno, "cannot fork");
-
- case 0: /* Child. */
- execl (MVDIR, "mvdir", from, to, (char *) 0);
- error (255, errno, "cannot run `%s'", MVDIR);
-
- default: /* Parent. */
- while (wait (&status) != pid)
- /* Do nothing. */ ;
-
- errno = 0; /* mvdir printed the system error message. */
- return status != 0 ? -1 : 0;
- }
- #else /* no MVDIR */
- error (1, 0, "internal error: cannot move directories");
- #endif /* no MVDIR */
- }
- else
- {
- /* We don't check existence_error because the systems which need it
- have rename(). */
- if (link (from, to) == 0 && (unlink (from) == 0 || errno == ENOENT))
- return 0;
- }
- }
- return -1;
- }
-