1 /*
2 * Check decoding of preadv and pwritev 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 #if defined HAVE_PREADV && defined HAVE_PWRITEV
34
35 # include <fcntl.h>
36 # include <stdio.h>
37 # include <sys/uio.h>
38 # include <unistd.h>
39
40 int
main(void)41 main(void)
42 {
43 tprintf("%s", "");
44
45 static char tmp[] = "preadv-pwritev-tmpfile";
46 if (open(tmp, O_CREAT|O_RDONLY|O_TRUNC, 0600) != 0)
47 perror_msg_and_fail("creat: %s", tmp);
48 if (open(tmp, O_WRONLY) != 1)
49 perror_msg_and_fail("open: %s", tmp);
50 if (unlink(tmp))
51 perror_msg_and_fail("unlink: %s", tmp);
52
53 static const char w0_c[] = "012";
54 const char *w0_d = hexdump_strdup(w0_c);
55 void *w0 = tail_memdup(w0_c, LENGTH_OF(w0_c));
56
57 const void *efault = w0 + LENGTH_OF(w0_c);
58
59 static const char w1_c[] = "34567";
60 const char *w1_d = hexdump_strdup(w1_c);
61 void *w1 = tail_memdup(w1_c, LENGTH_OF(w1_c));
62
63 static const char w2_c[] = "89abcde";
64 const char *w2_d = hexdump_strdup(w2_c);
65 void *w2 = tail_memdup(w2_c, LENGTH_OF(w2_c));
66
67 long rc;
68
69 rc = pwritev(1, efault, 42, 0);
70 tprintf("pwritev(1, %p, 42, 0) = %ld %s (%m)\n",
71 efault, rc, errno2name());
72
73 rc = preadv(0, efault, 42, 0);
74 tprintf("preadv(0, %p, 42, 0) = %ld %s (%m)\n",
75 efault, rc, errno2name());
76
77 static const char r0_c[] = "01234567";
78 const char *r0_d = hexdump_strdup(r0_c);
79 static const char r1_c[] = "89abcde";
80 const char *r1_d = hexdump_strdup(r1_c);
81
82 const struct iovec w_iov_[] = {
83 {
84 .iov_base = w0,
85 .iov_len = LENGTH_OF(w0_c)
86 }, {
87 .iov_base = w1,
88 .iov_len = LENGTH_OF(w1_c)
89 }, {
90 .iov_base = w2,
91 .iov_len = LENGTH_OF(w2_c)
92 }
93 };
94 const struct iovec *w_iov = tail_memdup(w_iov_, sizeof(w_iov_));
95
96 rc = pwritev(1, w_iov, 0, 0);
97 if (rc)
98 perror_msg_and_fail("pwritev: expected 0, returned %ld", rc);
99 tprintf("pwritev(1, [], 0, 0) = 0\n");
100
101 rc = pwritev(1, w_iov + ARRAY_SIZE(w_iov_) - 1, 2, 0);
102 tprintf("pwritev(1, [{iov_base=\"%s\", iov_len=%u}, ... /* %p */], 2, 0)"
103 " = %ld %s (%m)\n",
104 w2_c, LENGTH_OF(w2_c), w_iov + ARRAY_SIZE(w_iov_),
105 rc, errno2name());
106
107 const unsigned int w_len =
108 LENGTH_OF(w0_c) + LENGTH_OF(w1_c) + LENGTH_OF(w2_c);
109
110 rc = pwritev(1, w_iov, ARRAY_SIZE(w_iov_), 0);
111 if (rc != (int) w_len)
112 perror_msg_and_fail("pwritev: expected %u, returned %ld",
113 w_len, rc);
114 close(1);
115 tprintf("pwritev(1, [{iov_base=\"%s\", iov_len=%u}"
116 ", {iov_base=\"%s\", iov_len=%u}"
117 ", {iov_base=\"%s\", iov_len=%u}], %u, 0) = %u\n"
118 " * %u bytes in buffer 0\n"
119 " | 00000 %-49s %-16s |\n"
120 " * %u bytes in buffer 1\n"
121 " | 00000 %-49s %-16s |\n"
122 " * %u bytes in buffer 2\n"
123 " | 00000 %-49s %-16s |\n",
124 w0_c, LENGTH_OF(w0_c), w1_c, LENGTH_OF(w1_c),
125 w2_c, LENGTH_OF(w2_c), (unsigned int) ARRAY_SIZE(w_iov_), w_len,
126 LENGTH_OF(w0_c), w0_d, w0_c,
127 LENGTH_OF(w1_c), w1_d, w1_c, LENGTH_OF(w2_c), w2_d, w2_c);
128
129 const unsigned int r_len = (w_len + 1) / 2;
130 void *r0 = tail_alloc(r_len);
131 const struct iovec r0_iov_[] = {
132 {
133 .iov_base = r0,
134 .iov_len = r_len
135 }
136 };
137 const struct iovec *r_iov = tail_memdup(r0_iov_, sizeof(r0_iov_));
138
139 rc = preadv(0, r_iov, ARRAY_SIZE(r0_iov_), 0);
140 if (rc != (int) r_len)
141 perror_msg_and_fail("preadv: expected %u, returned %ld",
142 r_len, rc);
143 tprintf("preadv(0, [{iov_base=\"%s\", iov_len=%u}], %u, 0) = %u\n"
144 " * %u bytes in buffer 0\n"
145 " | 00000 %-49s %-16s |\n",
146 r0_c, r_len, (unsigned int) ARRAY_SIZE(r0_iov_),
147 r_len, r_len, r0_d, r0_c);
148
149 void *r1 = tail_alloc(r_len);
150 void *r2 = tail_alloc(w_len);
151 const struct iovec r1_iov_[] = {
152 {
153 .iov_base = r1,
154 .iov_len = r_len
155 },
156 {
157 .iov_base = r2,
158 .iov_len = w_len
159 }
160 };
161 r_iov = tail_memdup(r1_iov_, sizeof(r1_iov_));
162
163 rc = preadv(0, r_iov, ARRAY_SIZE(r1_iov_), r_len);
164 if (rc != (int) w_len - (int) r_len)
165 perror_msg_and_fail("preadv: expected %d, returned %ld",
166 (int) w_len - r_len, rc);
167 tprintf("preadv(0, [{iov_base=\"%s\", iov_len=%u}"
168 ", {iov_base=\"\", iov_len=%u}], %u, %u) = %u\n"
169 " * %u bytes in buffer 0\n"
170 " | 00000 %-49s %-16s |\n",
171 r1_c, r_len, w_len, (unsigned int) ARRAY_SIZE(r1_iov_),
172 r_len, w_len - r_len,
173 w_len - r_len, r1_d, r1_c);
174 close(0);
175
176 tprintf("+++ exited with 0 +++\n");
177 return 0;
178 }
179
180 #else
181
182 SKIP_MAIN_UNDEFINED("HAVE_PREADV && HAVE_PWRITEV")
183
184 #endif
185