1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) 2018 FUJITSU LIMITED. All rights reserved.
4 * Author: Xiao Yang <yangx.jy@cn.fujitsu.com>
5 */
6
7 /*
8 * Description:
9 * Testcase to check the basic functionality of the preadv2(2).
10 * 1) If the file offset argument is not -1, preadv2() should succeed
11 * in reading the expected content of data and the file offset is
12 * not changed after reading.
13 * 2) If the file offset argument is -1, preadv2() should succeed in
14 * reading the expected content of data and the current file offset
15 * is used and changed after reading.
16 */
17
18 #define _GNU_SOURCE
19 #include <string.h>
20 #include <sys/uio.h>
21
22 #include "tst_test.h"
23 #include "lapi/preadv2.h"
24
25 #define CHUNK 64
26
27 static int fd;
28 static char buf[CHUNK];
29
30 static struct iovec rd_iovec[] = {
31 {buf, CHUNK},
32 {NULL, 0},
33 };
34
35 static struct tcase {
36 off_t seek_off;
37 int count;
38 off_t read_off;
39 ssize_t size;
40 char content;
41 off_t exp_off;
42 } tcases[] = {
43 {0, 1, 0, CHUNK, 'a', 0},
44 {CHUNK, 2, 0, CHUNK, 'a', CHUNK},
45 {0, 1, CHUNK*3 / 2, CHUNK / 2, 'b', 0},
46 {0, 1, -1, CHUNK, 'a', CHUNK},
47 {0, 2, -1, CHUNK, 'a', CHUNK},
48 {CHUNK, 1, -1, CHUNK, 'b', CHUNK * 2},
49 };
50
verify_preadv2(unsigned int n)51 static void verify_preadv2(unsigned int n)
52 {
53 int i;
54 char *vec;
55 struct tcase *tc = &tcases[n];
56
57 vec = rd_iovec[0].iov_base;
58 memset(vec, 0x00, CHUNK);
59
60 SAFE_LSEEK(fd, tc->seek_off, SEEK_SET);
61
62 TEST(preadv2(fd, rd_iovec, tc->count, tc->read_off, 0));
63 if (TST_RET < 0) {
64 tst_res(TFAIL | TTERRNO, "preadv2() failed");
65 return;
66 }
67
68 if (TST_RET != tc->size) {
69 tst_res(TFAIL, "preadv2() read %li bytes, expected %zi",
70 TST_RET, tc->size);
71 return;
72 }
73
74 for (i = 0; i < tc->size; i++) {
75 if (vec[i] != tc->content)
76 break;
77 }
78
79 if (i < tc->size) {
80 tst_res(TFAIL, "Buffer wrong at %i have %02x expected %02x",
81 i, vec[i], tc->content);
82 return;
83 }
84
85 if (SAFE_LSEEK(fd, 0, SEEK_CUR) != tc->exp_off) {
86 tst_res(TFAIL, "preadv2() has changed file offset");
87 return;
88 }
89
90 tst_res(TPASS, "preadv2() read %zi bytes with content '%c' expectedly",
91 tc->size, tc->content);
92 }
93
setup(void)94 static void setup(void)
95 {
96 char buf[CHUNK];
97
98 fd = SAFE_OPEN("file", O_RDWR | O_CREAT, 0644);
99
100 memset(buf, 'a', sizeof(buf));
101 SAFE_WRITE(1, fd, buf, sizeof(buf));
102
103 memset(buf, 'b', sizeof(buf));
104 SAFE_WRITE(1, fd, buf, sizeof(buf));
105 }
106
cleanup(void)107 static void cleanup(void)
108 {
109 if (fd > 0)
110 SAFE_CLOSE(fd);
111 }
112
113 static struct tst_test test = {
114 .tcnt = ARRAY_SIZE(tcases),
115 .setup = setup,
116 .cleanup = cleanup,
117 .test = verify_preadv2,
118 .needs_tmpdir = 1,
119 };
120