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// SPDX-License-Identifier: CDDL-1.0
/* SPDX-License-Identifier: CDDL-1.0 OR MPL-2.0 */
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or https://opensource.org/licenses/CDDL-1.0.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (C) 2019 Aleksa Sarai <cyphar@cyphar.com>
* Copyright (C) 2019 SUSE LLC
*/
/*
* mv(1) doesn't currently support RENAME_{EXCHANGE,WHITEOUT} so this is a very
* simple renameat2(2) wrapper for the OpenZFS self-tests.
*/
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/syscall.h>
#ifndef SYS_renameat2
#ifdef __NR_renameat2
#define SYS_renameat2 __NR_renameat2
#elif defined(__x86_64__)
#define SYS_renameat2 316
#elif defined(__i386__)
#define SYS_renameat2 353
#elif defined(__arm__) || defined(__aarch64__)
#define SYS_renameat2 382
#else
#error "SYS_renameat2 not known for this architecture."
#endif
#endif
#ifndef RENAME_NOREPLACE
#define RENAME_NOREPLACE (1 << 0) /* Don't overwrite target */
#endif
#ifndef RENAME_EXCHANGE
#define RENAME_EXCHANGE (1 << 1) /* Exchange source and dest */
#endif
#ifndef RENAME_WHITEOUT
#define RENAME_WHITEOUT (1 << 2) /* Whiteout source */
#endif
/* glibc doesn't provide renameat2 wrapper, let's use our own */
static int
sys_renameat2(int olddirfd, const char *oldpath,
int newdirfd, const char *newpath, unsigned int flags)
{
int ret = syscall(SYS_renameat2, olddirfd, oldpath, newdirfd, newpath,
flags);
return ((ret < 0) ? -errno : ret);
}
static void
usage(void)
{
fprintf(stderr, "usage: renameat2 [-Cnwx] src dst\n");
exit(1);
}
static void
check(void)
{
int err = sys_renameat2(AT_FDCWD, ".", AT_FDCWD, ".", RENAME_EXCHANGE);
exit(err == -ENOSYS);
}
int
main(int argc, char **argv)
{
char *src, *dst;
int ch, err;
unsigned int flags = 0;
while ((ch = getopt(argc, argv, "Cnwx")) >= 0) {
switch (ch) {
case 'C':
check();
break;
case 'n':
flags |= RENAME_NOREPLACE;
break;
case 'w':
flags |= RENAME_WHITEOUT;
break;
case 'x':
flags |= RENAME_EXCHANGE;
break;
default:
usage();
break;
}
}
argc -= optind;
argv += optind;
if (argc != 2)
usage();
src = argv[0];
dst = argv[1];
err = sys_renameat2(AT_FDCWD, src, AT_FDCWD, dst, flags);
if (err < 0)
fprintf(stderr, "renameat2: %s", strerror(-err));
return (err != 0);
}
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