1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) 2021 FUJITSU LIMITED. All rights reserved.
4 * Author: Yang Xu <xuyang2018.jy@fujitsu.com>
5 */
6
7 /*\
8 * [Description]
9 *
10 * Test whether the file offset are the same for both file descriptors.
11 */
12
13 #include <errno.h>
14 #include <stdio.h>
15 #include <unistd.h>
16 #include "tst_test.h"
17 #include "tst_safe_macros.h"
18
19 #define WRITE_STR "abcdefg"
20
21 static int ofd = -1, nfd = 10;
22
23 static struct tcase {
24 off_t offset;
25 size_t exp_size;
26 /* 0 - change offset before dup2, 1 - change offset after dup2 */
27 int flag;
28 char *exp_data;
29 char *desc;
30 } tcases[] = {
31 {1, 6, 0, "bcdefg", "Test offset with lseek before dup2"},
32 {2, 5, 1, "cdefg", "Test offset with lseek after dup2"},
33 };
34
setup(void)35 static void setup(void)
36 {
37 ofd = SAFE_OPEN("testfile", O_RDWR | O_CREAT, 0644);
38 SAFE_WRITE(1, ofd, WRITE_STR, sizeof(WRITE_STR) - 1);
39 }
40
cleanup(void)41 static void cleanup(void)
42 {
43 if (ofd > 0)
44 SAFE_CLOSE(ofd);
45 close(nfd);
46 }
47
run(unsigned int i)48 static void run(unsigned int i)
49 {
50 struct tcase *tc = tcases + i;
51 char read_buf[20];
52
53 memset(read_buf, 0, sizeof(read_buf));
54
55 tst_res(TINFO, "%s", tc->desc);
56 if (!tc->flag)
57 SAFE_LSEEK(ofd, tc->offset, SEEK_SET);
58
59 TEST(dup2(ofd, nfd));
60 if (TST_RET == -1) {
61 tst_res(TFAIL | TTERRNO, "call failed unexpectedly");
62 return;
63 }
64 if (tc->flag)
65 SAFE_LSEEK(ofd, tc->offset, SEEK_SET);
66
67 SAFE_READ(1, nfd, read_buf, tc->exp_size);
68 if (strncmp(read_buf, tc->exp_data, tc->exp_size))
69 tst_res(TFAIL, "Expect %s, but get %s.", tc->exp_data, read_buf);
70 else
71 tst_res(TPASS, "Get expected buf %s", read_buf);
72 }
73
74 static struct tst_test test = {
75 .needs_tmpdir = 1,
76 .tcnt = ARRAY_SIZE(tcases),
77 .test = run,
78 .setup = setup,
79 .cleanup = cleanup,
80 };
81