/contrib/cvs/lib/rename.c
https://bitbucket.org/freebsd/freebsd-head/ · C · 80 lines · 49 code · 9 blank · 22 comment · 17 complexity · d2e174a8b4ec0f4a42f6fbf2bbf94f57 MD5 · raw file
- /* 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. */
- #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 (CVS_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 && (CVS_UNLINK (from) == 0 || errno == ENOENT))
- return 0;
- }
- }
- return -1;
- }