tools/testing/selftests/filesystems/fat/rename_exchange.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Program that atomically exchanges two paths using
   4  * the renameat2() system call RENAME_EXCHANGE flag.
   5  *
   6  * Copyright 2022 Red Hat Inc.
   7  * Author: Javier Martinez Canillas <[email protected]>
   8  */
   9
  10 #define _GNU_SOURCE
  11 #include <fcntl.h>
  12 #include <stdio.h>
  13 #include <stdlib.h>
  14
  15 void print_usage(const char *program)
  16 {
  17         printf("Usage: %s [oldpath] [newpath]\n", program);
  18         printf("Atomically exchange oldpath and newpath\n");
  19 }
  20
  21 int main(int argc, char *argv[])
  22 {
  23         int ret;
  24
  25         if (argc != 3) {
  26                 print_usage(argv[0]);
  27                 exit(EXIT_FAILURE);
  28         }
  29
  30         ret = renameat2(AT_FDCWD, argv[1], AT_FDCWD, argv[2], RENAME_EXCHANGE);
  31         if (ret) {
  32                 perror("rename exchange failed");
  33                 exit(EXIT_FAILURE);
  34         }
  35
  36         exit(EXIT_SUCCESS);
  37 }