renameat2.c

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    1 /* SPDX-License-Identifier: CDDL-1.0 OR MPL-2.0 */
    2 /*
    3  * CDDL HEADER START
    4  *
    5  * The contents of this file are subject to the terms of the
    6  * Common Development and Distribution License (the "License").
    7  * You may not use this file except in compliance with the License.
    8  *
    9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   10  * or http://www.opensolaris.org/os/licensing.
   11  * See the License for the specific language governing permissions
   12  * and limitations under the License.
   13  *
   14  * When distributing Covered Code, include this CDDL HEADER in each
   15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
   16  * If applicable, add the following below this CDDL HEADER, with the
   17  * fields enclosed by brackets "[]" replaced with your own identifying
   18  * information: Portions Copyright [yyyy] [name of copyright owner]
   19  *
   20  * CDDL HEADER END
   21  */
   22 
   23 /*
   24  * Copyright (C) 2019 Aleksa Sarai <cyphar@cyphar.com>
   25  * Copyright (C) 2019 SUSE LLC
   26  */
   27 
   28 /*
   29  * mv(1) doesn't currently support RENAME_{EXCHANGE,WHITEOUT} so this is a very
   30  * simple renameat2(2) wrapper for the OpenZFS self-tests.
   31  */
   32 
   33 #include <errno.h>
   34 #include <fcntl.h>
   35 #include <unistd.h>
   36 #include <stdio.h>
   37 #include <stdlib.h>
   38 #include <string.h>
   39 #include <sys/syscall.h>
   40 
   41 #ifndef SYS_renameat2
   42 #ifdef __NR_renameat2
   43 #define SYS_renameat2 __NR_renameat2
   44 #elif defined(__x86_64__)
   45 #define SYS_renameat2 316
   46 #elif defined(__i386__)
   47 #define SYS_renameat2 353
   48 #elif defined(__arm__) || defined(__aarch64__)
   49 #define SYS_renameat2 382
   50 #else
   51 #error "SYS_renameat2 not known for this architecture."
   52 #endif
   53 #endif
   54 
   55 #ifndef RENAME_NOREPLACE
   56 #define RENAME_NOREPLACE        (1 << 0) /* Don't overwrite target */
   57 #endif
   58 #ifndef RENAME_EXCHANGE
   59 #define RENAME_EXCHANGE         (1 << 1) /* Exchange source and dest */
   60 #endif
   61 #ifndef RENAME_WHITEOUT
   62 #define RENAME_WHITEOUT         (1 << 2) /* Whiteout source */
   63 #endif
   64 
   65 /* glibc doesn't provide renameat2 wrapper, let's use our own */
   66 static int
   67 sys_renameat2(int olddirfd, const char *oldpath,
   68     int newdirfd, const char *newpath, unsigned int flags)
   69 {
   70         int ret = syscall(SYS_renameat2, olddirfd, oldpath, newdirfd, newpath,
   71             flags);
   72         return ((ret < 0) ? -errno : ret);
   73 }
   74 
   75 static void
   76 usage(void)
   77 {
   78         fprintf(stderr, "usage: renameat2 [-Cnwx] src dst\n");
   79         exit(1);
   80 }
   81 
   82 static void
   83 check(void)
   84 {
   85         int err = sys_renameat2(AT_FDCWD, ".", AT_FDCWD, ".", RENAME_EXCHANGE);
   86         exit(err == -ENOSYS);
   87 }
   88 
   89 int
   90 main(int argc, char **argv)
   91 {
   92         char *src, *dst;
   93         int ch, err;
   94         unsigned int flags = 0;
   95 
   96         while ((ch = getopt(argc, argv, "Cnwx")) >= 0) {
   97                 switch (ch) {
   98                         case 'C':
   99                                 check();
  100                                 break;
  101                         case 'n':
  102                                 flags |= RENAME_NOREPLACE;
  103                                 break;
  104                         case 'w':
  105                                 flags |= RENAME_WHITEOUT;
  106                                 break;
  107                         case 'x':
  108                                 flags |= RENAME_EXCHANGE;
  109                                 break;
  110                         default:
  111                                 usage();
  112                                 break;
  113                 }
  114         }
  115 
  116         argc -= optind;
  117         argv += optind;
  118 
  119         if (argc != 2)
  120                 usage();
  121         src = argv[0];
  122         dst = argv[1];
  123 
  124         err = sys_renameat2(AT_FDCWD, src, AT_FDCWD, dst, flags);
  125         if (err < 0)
  126                 fprintf(stderr, "renameat2: %s", strerror(-err));
  127         return (err != 0);
  128 }

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FreeBSD/Linux Kernel Cross Reference sys/contrib/openzfs/tests/zfs-tests/cmd/renameat2.c

FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/tests/zfs-tests/cmd/renameat2.c