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// 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);
}
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