1/*
2 * Copyright (c) International Business Machines  Corp., 2001
3 * 06/2017 modified by Xiao Yang <yangx.jy@cn.fujitsu.com>
4 *
5 * This program is free software;  you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY;  without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
13 * the GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program;  if not, see <http://www.gnu.org/licenses/>.
17 */
18
19/*
20 * Description:
21 * lseek() succeeds to set the specified offset according to whence
22 * and write valid data from this location.
23 */
24
25#include <errno.h>
26#include <string.h>
27#include <sys/types.h>
28#include <unistd.h>
29#include "tst_test.h"
30
31#define TFILE1 "tfile1"
32#define TFILE2 "tfile2"
33#define WR_STR1 "abcdefg"
34#define WR_STR2 "ijk"
35
36static int fd1, fd2;
37static struct tcase {
38	int *fd;
39	char *fname;
40	off_t off;
41	off_t exp_off;
42	int exp_size;
43	char *exp_data;
44} tcases[] = {
45	{&fd1, TFILE1, 7, 7, 10, "abcdefgijk"},
46	{&fd2, TFILE2, 2, 2, 7, "abijkfg"},
47};
48
49static void verify_lseek(unsigned int n)
50{
51	char read_buf[64];
52	struct tcase *tc = &tcases[n];
53
54	memset(read_buf, 0, sizeof(read_buf));
55
56	TEST(lseek(*tc->fd, tc->off, SEEK_SET));
57	if (TEST_RETURN == (off_t) -1) {
58		tst_res(TFAIL | TTERRNO, "lseek(%s, %ld, SEEK_SET) failed",
59			tc->fname, tc->off);
60		return;
61	}
62
63	if (TEST_RETURN != tc->exp_off) {
64		tst_res(TFAIL, "lseek(%s, %ld, SEEK_SET) returned %ld, expected %ld",
65			tc->fname, tc->off, TEST_RETURN, tc->exp_off);
66		return;
67	}
68
69	SAFE_WRITE(1, *tc->fd, WR_STR2, sizeof(WR_STR2) - 1);
70
71	SAFE_CLOSE(*tc->fd);
72
73	*tc->fd = SAFE_OPEN(tc->fname, O_RDWR);
74
75	SAFE_READ(1, *tc->fd, read_buf, tc->exp_size);
76
77	if (strcmp(read_buf, tc->exp_data)) {
78		tst_res(TFAIL, "lseek(%s, %ld, SEEK_SET) wrote incorrect data %s",
79			tc->fname, tc->off, read_buf);
80	} else {
81		tst_res(TPASS, "lseek(%s, %ld, SEEK_SET) wrote correct data %s",
82			tc->fname, tc->off, read_buf);
83	}
84}
85
86static void setup(void)
87{
88	fd1 = SAFE_OPEN(TFILE1, O_RDWR | O_CREAT, 0644);
89	fd2 = SAFE_OPEN(TFILE2, O_RDWR | O_CREAT, 0644);
90
91	SAFE_WRITE(1, fd1, WR_STR1, sizeof(WR_STR1) - 1);
92	SAFE_WRITE(1, fd2, WR_STR1, sizeof(WR_STR1) - 1);
93}
94
95static void cleanup(void)
96{
97	if (fd1 > 0)
98		SAFE_CLOSE(fd1);
99
100	if (fd2 > 0)
101		SAFE_CLOSE(fd2);
102}
103
104static struct tst_test test = {
105	.setup = setup,
106	.cleanup = cleanup,
107	.tcnt = ARRAY_SIZE(tcases),
108	.test = verify_lseek,
109	.needs_tmpdir = 1,
110};
111