1 /* Common definitions for preadv and pwritev.
2 Copyright (C) 2016-2023 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library 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 the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19 #include <array_length.h>
20 #include <stdbool.h>
21 #include <stdio.h>
22 #include <stdint.h>
23 #include <errno.h>
24 #include <string.h>
25 #include <sys/uio.h>
26 #include <sys/stat.h>
27
28 #include <support/check.h>
29 #include <support/temp_file.h>
30 #include <support/support.h>
31 #include <support/xunistd.h>
32
33 static char *temp_filename;
34 static int temp_fd;
35 static bool temp_fd_supports_holes;
36
37 static int do_test (void);
38
39 static void
40 do_prepare (int argc, char **argv)
41 {
42 temp_fd = create_temp_file ("tst-preadvwritev.", &temp_filename);
43 if (temp_fd == -1)
44 FAIL_EXIT1 ("cannot create temporary file");
45 temp_fd_supports_holes = support_descriptor_supports_holes (temp_fd);
46 }
47 #define PREPARE do_prepare
48
49 #ifndef PREADV
50 # define PREADV(__fd, __iov, __iovcnt, __offset) \
51 preadv (__fd, __iov, __iovcnt, __offset)
52 #endif
53
54 #ifndef PWRITEV
55 # define PWRITEV(__fd, __iov, __iovcnt, __offset) \
56 pwritev (__fd, __iov, __iovcnt, __offset)
57 #endif
58
59 static __attribute__ ((unused)) void
60 do_test_without_offset (void)
61 {
62 xftruncate (temp_fd, 0);
63
64 xwrite (temp_fd, "123", 3);
65 xlseek (temp_fd, 2, SEEK_SET);
66 {
67 struct iovec iov[] =
68 {
69 { (void *) "abc", 3 },
70 { (void *) "xyzt", 4 },
71 };
72 TEST_COMPARE (PWRITEV (temp_fd, iov, array_length (iov), -1), 7);
73 }
74 TEST_COMPARE (xlseek (temp_fd, 0, SEEK_CUR), 9);
75
76 xlseek (temp_fd, 1, SEEK_SET);
77 char buf1[3];
78 char buf2[2];
79 {
80 struct iovec iov[] =
81 {
82 { buf1, sizeof (buf1) },
83 { buf2, sizeof (buf2) },
84 };
85 TEST_COMPARE (PREADV (temp_fd, iov, array_length (iov), -1),
86 sizeof (buf1) + sizeof (buf2));
87 TEST_COMPARE (memcmp ("2ab", buf1, sizeof (buf1)), 0);
88 TEST_COMPARE (memcmp ("cx", buf2, sizeof (buf2)), 0);
89 TEST_COMPARE (xlseek (temp_fd, 0, SEEK_CUR), 6);
90 }
91
92 xftruncate (temp_fd, 0);
93 }
94
95 static int
96 do_test_with_offset (off_t offset)
97 {
98 struct iovec iov[2];
99 ssize_t ret;
100
101 char buf1[32];
102 char buf2[64];
103
104 memset (buf1, 0xf0, sizeof buf1);
105 memset (buf2, 0x0f, sizeof buf2);
106
107 /* Write two buffer with 32 and 64 bytes respectively. */
108 memset (iov, 0, sizeof iov);
109 iov[0].iov_base = buf1;
110 iov[0].iov_len = sizeof buf1;
111 iov[1].iov_base = buf2;
112 iov[1].iov_len = sizeof buf2;
113
114 ret = PWRITEV (temp_fd, iov, 2, offset);
115 if (ret == -1)
116 FAIL_RET ("first pwritev returned -1");
117 if (ret != (sizeof buf1 + sizeof buf2))
118 FAIL_RET ("first pwritev returned an unexpected value");
119
120 ret = PWRITEV (temp_fd, iov, 2, sizeof buf1 + sizeof buf2 + offset);
121 if (ret == -1)
122 FAIL_RET ("second pwritev returned -1");
123 if (ret != (sizeof buf1 + sizeof buf2))
124 FAIL_RET ("second pwritev returned an unexpected value");
125
126 char buf3[32];
127 char buf4[64];
128
129 memset (buf3, 0x0f, sizeof buf3);
130 memset (buf4, 0xf0, sizeof buf4);
131
132 iov[0].iov_base = buf3;
133 iov[0].iov_len = sizeof buf3;
134 iov[1].iov_base = buf4;
135 iov[1].iov_len = sizeof buf4;
136
137 /* Now read two buffer with 32 and 64 bytes respectively. */
138 ret = PREADV (temp_fd, iov, 2, offset);
139 if (ret == -1)
140 FAIL_RET ("first preadv returned -1");
141 if (ret != (sizeof buf3 + sizeof buf4))
142 FAIL_RET ("first preadv returned an unexpected value");
143
144 if (memcmp (buf1, buf3, sizeof buf1) != 0)
145 FAIL_RET ("first buffer from first preadv different than expected");
146 if (memcmp (buf2, buf4, sizeof buf2) != 0)
147 FAIL_RET ("second buffer from first preadv different than expected");
148
149 ret = PREADV (temp_fd, iov, 2, sizeof buf3 + sizeof buf4 + offset);
150 if (ret == -1)
151 FAIL_RET ("second preadv returned -1");
152 if (ret != (sizeof buf3 + sizeof buf4))
153 FAIL_RET ("second preadv returned an unexpected value");
154
155 /* And compare the buffers read and written to check if there are equal. */
156 if (memcmp (buf1, buf3, sizeof buf1) != 0)
157 FAIL_RET ("first buffer from second preadv different than expected");
158 if (memcmp (buf2, buf4, sizeof buf2) != 0)
159 FAIL_RET ("second buffer from second preadv different than expected");
160
161 return 0;
162 }
163
164 #include <support/test-driver.c>