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
22 static char filename0[40], filename1[40];
23 static int fd0 = -1, fd1 = -1;
24
25 static 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
run(unsigned int i)33 static 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(1, fd0, filename0, strlen(filename0));
44 SAFE_CLOSE(fd0);
45
46 fd1 = SAFE_CREAT(filename1, 0666);
47 SAFE_WRITE(1, 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");
82 free:
83 SAFE_CLOSE(fd0);
84 SAFE_CLOSE(fd1);
85 SAFE_UNLINK(filename0);
86 SAFE_UNLINK(filename1);
87 }
88
setup(void)89 static 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
cleanup(void)98 static void cleanup(void)
99 {
100 close(fd0);
101 close(fd1);
102 }
103
104 static struct tst_test test = {
105 .setup = setup,
106 .tcnt = ARRAY_SIZE(tcases),
107 .needs_tmpdir = 1,
108 .test = run,
109 .cleanup = cleanup,
110 };
111