85 lines
2.3 KiB
C
85 lines
2.3 KiB
C
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/* rename.c -- BSD compatible directory 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
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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#ifdef 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 STDC_HEADERS
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extern int errno;
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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;
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int pid, status;
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if (stat (from, &from_stats) == 0)
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{
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/* We don't check existence_error because the systems which need it
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have rename(). */
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if (unlink (to) && errno != ENOENT)
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return -1;
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if ((from_stats.st_mode & S_IFMT) == S_IFDIR)
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{
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#ifdef MVDIR
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/* I don't think MVDIR ever gets defined, but I don't think
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it matters, because I don't think CVS ever calls rename()
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on directories. */
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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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return status != 0 ? -1 : 0;
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}
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#else /* no MVDIR */
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error (1, 0, "internal error: cannot move directories");
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#endif /* no MVDIR */
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}
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else
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{
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/* We don't check existence_error because the systems which need it
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have rename(). */
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if (link (from, to) == 0 && (unlink (from) == 0 || errno == ENOENT))
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return 0;
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}
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}
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return -1;
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}
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