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

Source file repositories/reference/linux-study-clean/tools/testing/selftests/filesystems/fat/rename_exchange.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/filesystems/fat/rename_exchange.c
Extension
.c
Size
763 bytes
Lines
38
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Program that atomically exchanges two paths using
 * the renameat2() system call RENAME_EXCHANGE flag.
 *
 * Copyright 2022 Red Hat Inc.
 * Author: Javier Martinez Canillas <javierm@redhat.com>
 */

#define _GNU_SOURCE
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>

void print_usage(const char *program)
{
	printf("Usage: %s [oldpath] [newpath]\n", program);
	printf("Atomically exchange oldpath and newpath\n");
}

int main(int argc, char *argv[])
{
	int ret;

	if (argc != 3) {
		print_usage(argv[0]);
		exit(EXIT_FAILURE);
	}

	ret = renameat2(AT_FDCWD, argv[1], AT_FDCWD, argv[2], RENAME_EXCHANGE);
	if (ret) {
		perror("rename exchange failed");
		exit(EXIT_FAILURE);
	}

	exit(EXIT_SUCCESS);
}

Annotation

Implementation Notes