1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (c) International Business Machines  Corp., 2001
4 * 07/2001 Ported by Wayne Boyer
5 */
6
7/*\
8 * [Description]
9 *
10 * Testcase to check the basic functionality of dup2().
11 *
12 * - Attempt to dup2() on an open file descriptor.
13 * - Attempt to dup2() on a close file descriptor.
14 */
15
16#include <errno.h>
17#include <stdio.h>
18#include <unistd.h>
19#include "tst_test.h"
20#include "tst_safe_macros.h"
21
22static char filename0[40], filename1[40];
23static int fd0 = -1, fd1 = -1;
24
25static struct tcase {
26	char *desc;
27	int is_close;
28} tcases[] = {
29	{"Test duping over an open fd", 0},
30	{"Test duping over a close fd", 1},
31};
32
33static void run(unsigned int i)
34{
35	int fd2, rval;
36	char buf[40];
37
38	struct tcase *tc = tcases + i;
39
40	tst_res(TINFO, "%s", tc->desc);
41
42	fd0 = SAFE_CREAT(filename0, 0666);
43	SAFE_WRITE(SAFE_WRITE_ALL, fd0, filename0, strlen(filename0));
44	SAFE_CLOSE(fd0);
45
46	fd1 = SAFE_CREAT(filename1, 0666);
47	SAFE_WRITE(SAFE_WRITE_ALL, fd1, filename1, strlen(filename1));
48
49	fd0 = SAFE_OPEN(filename0, O_RDONLY);
50	SAFE_FCNTL(fd0, F_SETFD, 1);
51
52	if (tc->is_close) {
53		/* SAFE_CLOSE() sets the fd to -1 avoid it here */
54		rval = fd1;
55		SAFE_CLOSE(rval);
56	}
57
58	TEST(dup2(fd0, fd1));
59	fd2 = TST_RET;
60	if (TST_RET == -1) {
61		tst_res(TFAIL, "call failed unexpectedly");
62		goto free;
63	}
64	if (fd1 != fd2) {
65		tst_res(TFAIL, "file descriptors don't match");
66		goto free;
67	}
68
69	memset(buf, 0, sizeof(buf));
70	SAFE_READ(0, fd2, buf, sizeof(buf));
71	if (strcmp(buf, filename0) != 0)
72		tst_res(TFAIL, "read from file got bad data");
73	else
74		tst_res(TPASS, "test the content of file is correct");
75
76	rval = SAFE_FCNTL(fd2, F_GETFD);
77	if (rval != 0)
78		tst_res(TFAIL, "the FD_CLOEXEC flag is %#x, expected 0x0",
79			rval);
80	else
81		tst_res(TPASS, "test the FD_CLOEXEC flag is correct");
82free:
83	SAFE_CLOSE(fd0);
84	SAFE_CLOSE(fd1);
85	SAFE_UNLINK(filename0);
86	SAFE_UNLINK(filename1);
87}
88
89static void setup(void)
90{
91	int pid;
92
93	pid = getpid();
94	sprintf(filename0, "dup203.file0.%d\n", pid);
95	sprintf(filename1, "dup203.file1.%d\n", pid);
96}
97
98static void cleanup(void)
99{
100	close(fd0);
101	close(fd1);
102}
103
104static struct tst_test test = {
105	.setup = setup,
106	.tcnt = ARRAY_SIZE(tcases),
107	.needs_tmpdir = 1,
108	.test = run,
109	.cleanup = cleanup,
110};
111