81 lines
2.1 KiB
C
81 lines
2.1 KiB
C
/* 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 (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;
|
|
}
|