162306a36Sopenharmony_ci// SPDX-License-Identifier: GPL-2.0-or-later 262306a36Sopenharmony_ci/* 362306a36Sopenharmony_ci * Program that atomically exchanges two paths using 462306a36Sopenharmony_ci * the renameat2() system call RENAME_EXCHANGE flag. 562306a36Sopenharmony_ci * 662306a36Sopenharmony_ci * Copyright 2022 Red Hat Inc. 762306a36Sopenharmony_ci * Author: Javier Martinez Canillas <javierm@redhat.com> 862306a36Sopenharmony_ci */ 962306a36Sopenharmony_ci 1062306a36Sopenharmony_ci#define _GNU_SOURCE 1162306a36Sopenharmony_ci#include <fcntl.h> 1262306a36Sopenharmony_ci#include <stdio.h> 1362306a36Sopenharmony_ci#include <stdlib.h> 1462306a36Sopenharmony_ci 1562306a36Sopenharmony_civoid print_usage(const char *program) 1662306a36Sopenharmony_ci{ 1762306a36Sopenharmony_ci printf("Usage: %s [oldpath] [newpath]\n", program); 1862306a36Sopenharmony_ci printf("Atomically exchange oldpath and newpath\n"); 1962306a36Sopenharmony_ci} 2062306a36Sopenharmony_ci 2162306a36Sopenharmony_ciint main(int argc, char *argv[]) 2262306a36Sopenharmony_ci{ 2362306a36Sopenharmony_ci int ret; 2462306a36Sopenharmony_ci 2562306a36Sopenharmony_ci if (argc != 3) { 2662306a36Sopenharmony_ci print_usage(argv[0]); 2762306a36Sopenharmony_ci exit(EXIT_FAILURE); 2862306a36Sopenharmony_ci } 2962306a36Sopenharmony_ci 3062306a36Sopenharmony_ci ret = renameat2(AT_FDCWD, argv[1], AT_FDCWD, argv[2], RENAME_EXCHANGE); 3162306a36Sopenharmony_ci if (ret) { 3262306a36Sopenharmony_ci perror("rename exchange failed"); 3362306a36Sopenharmony_ci exit(EXIT_FAILURE); 3462306a36Sopenharmony_ci } 3562306a36Sopenharmony_ci 3662306a36Sopenharmony_ci exit(EXIT_SUCCESS); 3762306a36Sopenharmony_ci} 38