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