1 /*
2 * Check decoding of readv and writev syscalls.
3 *
4 * Copyright (c) 2016 Dmitry V. Levin <ldv@altlinux.org>
5 * Copyright (c) 2016-2018 The strace developers.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. The name of the author may not be used to endorse or promote products
17 * derived from this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 #include "tests.h"
32
33 #include <assert.h>
34 #include <stdio.h>
35 #include <unistd.h>
36 #include <sys/uio.h>
37
38 int
main(void)39 main(void)
40 {
41 tprintf("%s", "");
42
43 int fds[2];
44 pipe_maxfd(fds);
45
46 static const char w0_c[] = "012";
47 const char *w0_d = hexdump_strdup(w0_c);
48 void *w0 = tail_memdup(w0_c, LENGTH_OF(w0_c));
49
50 const void *efault = w0 + LENGTH_OF(w0_c);
51
52 static const char w1_c[] = "34567";
53 const char *w1_d = hexdump_strdup(w1_c);
54 void *w1 = tail_memdup(w1_c, LENGTH_OF(w1_c));
55
56 static const char w2_c[] = "89abcde";
57 const char *w2_d = hexdump_strdup(w2_c);
58 void *w2 = tail_memdup(w2_c, LENGTH_OF(w2_c));
59 long rc;
60
61 rc = writev(fds[1], efault, 42);
62 tprintf("writev(%d, %p, 42) = %ld %s (%m)\n",
63 fds[1], efault, rc, errno2name());
64
65 rc = readv(fds[0], efault, 42);
66 tprintf("readv(%d, %p, 42) = %ld %s (%m)\n",
67 fds[0], efault, rc, errno2name());
68
69 static const char r0_c[] = "01234567";
70 const char *r0_d = hexdump_strdup(r0_c);
71 static const char r1_c[] = "89abcde";
72 const char *r1_d = hexdump_strdup(r1_c);
73
74 const struct iovec w_iov_[] = {
75 {
76 .iov_base = w0,
77 .iov_len = LENGTH_OF(w0_c)
78 }, {
79 .iov_base = w1,
80 .iov_len = LENGTH_OF(w1_c)
81 }, {
82 .iov_base = w2,
83 .iov_len = LENGTH_OF(w2_c)
84 }
85 };
86 const struct iovec *w_iov = tail_memdup(w_iov_, sizeof(w_iov_));
87
88 tprintf("writev(%d, [], 0) = %ld\n",
89 fds[1], (long) writev(fds[1], w_iov, 0));
90
91 rc = writev(fds[1], w_iov + ARRAY_SIZE(w_iov_) - 1, 2);
92 tprintf("writev(%d, [{iov_base=\"%s\", iov_len=%u}, ... /* %p */], 2)"
93 " = %ld %s (%m)\n",
94 fds[1], w2_c, LENGTH_OF(w2_c), w_iov + ARRAY_SIZE(w_iov_),
95 rc, errno2name());
96
97 const unsigned int w_len =
98 LENGTH_OF(w0_c) + LENGTH_OF(w1_c) + LENGTH_OF(w2_c);
99
100 assert(writev(fds[1], w_iov, ARRAY_SIZE(w_iov_)) == (int) w_len);
101 close(fds[1]);
102 tprintf("writev(%d, [{iov_base=\"%s\", iov_len=%u}"
103 ", {iov_base=\"%s\", iov_len=%u}"
104 ", {iov_base=\"%s\", iov_len=%u}], %u) = %u\n"
105 " * %u bytes in buffer 0\n"
106 " | 00000 %-49s %-16s |\n"
107 " * %u bytes in buffer 1\n"
108 " | 00000 %-49s %-16s |\n"
109 " * %u bytes in buffer 2\n"
110 " | 00000 %-49s %-16s |\n",
111 fds[1], w0_c, LENGTH_OF(w0_c), w1_c, LENGTH_OF(w1_c),
112 w2_c, LENGTH_OF(w2_c), (unsigned int) ARRAY_SIZE(w_iov_), w_len,
113 LENGTH_OF(w0_c), w0_d, w0_c,
114 LENGTH_OF(w1_c), w1_d, w1_c, LENGTH_OF(w2_c), w2_d, w2_c);
115
116 const unsigned int r_len = (w_len + 1) / 2;
117 void *r0 = tail_alloc(r_len);
118 const struct iovec r0_iov_[] = {
119 {
120 .iov_base = r0,
121 .iov_len = r_len
122 }
123 };
124 const struct iovec *r_iov = tail_memdup(r0_iov_, sizeof(r0_iov_));
125
126 assert(readv(fds[0], r_iov, ARRAY_SIZE(r0_iov_)) == (int) r_len);
127 tprintf("readv(%d, [{iov_base=\"%s\", iov_len=%u}], %u) = %u\n"
128 " * %u bytes in buffer 0\n"
129 " | 00000 %-49s %-16s |\n",
130 fds[0], r0_c, r_len, (unsigned int) ARRAY_SIZE(r0_iov_),
131 r_len, r_len, r0_d, r0_c);
132
133 void *r1 = tail_alloc(r_len);
134 void *r2 = tail_alloc(w_len);
135 const struct iovec r1_iov_[] = {
136 {
137 .iov_base = r1,
138 .iov_len = r_len
139 },
140 {
141 .iov_base = r2,
142 .iov_len = w_len
143 }
144 };
145 r_iov = tail_memdup(r1_iov_, sizeof(r1_iov_));
146
147 assert(readv(fds[0], r_iov, ARRAY_SIZE(r1_iov_)) == (int) w_len - (int) r_len);
148 tprintf("readv(%d, [{iov_base=\"%s\", iov_len=%u}"
149 ", {iov_base=\"\", iov_len=%u}], %u) = %u\n"
150 " * %u bytes in buffer 0\n"
151 " | 00000 %-49s %-16s |\n",
152 fds[0], r1_c, r_len, w_len, (unsigned int) ARRAY_SIZE(r1_iov_),
153 w_len - r_len, w_len - r_len, r1_d, r1_c);
154 close(fds[0]);
155
156 tprintf("+++ exited with 0 +++\n");
157 return 0;
158 }
159