// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (c) 2018 Linux Test Project
 * Copyright (c) 2015 Cyril Hrubis <chrubis@suse.cz>
 * Copyright (c) International Business Machines Corp., 2001
 *
 * Ported to LTP: Wayne Boyer
 *  04/2008 Roy Lee <roylee@andestech.com>
 */

/*\
 * [Description]
 *
 * Attempt to execve(2) a file which is being opened by another process for
 * writing fails with ETXTBSY.
 */

#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include <sys/types.h>
#include <sys/wait.h>
#include <errno.h>
#include <fcntl.h>
#include <libgen.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>

#include "tst_test.h"

#define TEST_APP "execve_child"

static void do_child(void);

static void verify_execve(void)
{
	pid_t pid;
	char *argv[2] = {TEST_APP, NULL};

	pid = SAFE_FORK();
	if (pid == 0)
		do_child();

	TST_CHECKPOINT_WAIT(0);

	TEST(execve(TEST_APP, argv, environ));

	if (TST_ERR != ETXTBSY)
		tst_res(TFAIL | TTERRNO, "execve succeeded, expected failure");
	else
		tst_res(TPASS | TTERRNO, "execve failed as expected");

	TST_CHECKPOINT_WAKE(0);
}

static void do_child(void)
{
	int fd = SAFE_OPEN(TEST_APP, O_WRONLY);

	TST_CHECKPOINT_WAKE_AND_WAIT(0);

	SAFE_CLOSE(fd);

	exit(0);
}

static void setup(void)
{
	if ((tst_kvercmp(6, 11, 0)) >= 0) {
		tst_brk(TCONF, "Skipping test, write to executed file is "
			"allowed since 6.11-rc1.\n"
			"2a010c412853 (\"fs: don't block i_writecount during exec\")");
	}
}

static struct tst_test test = {
	.setup = setup,
	.test_all = verify_execve,
	.forks_child = 1,
	.child_needs_reinit = 1,
	.needs_checkpoints = 1,
	.resource_files = (const char *const []) {
		TEST_APP,
		NULL
	}
};