1 /*
2 * Check decoding of preadv and pwritev 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 #if defined HAVE_PREADV && defined HAVE_PWRITEV
33
34 # include <fcntl.h>
35 # include <stdio.h>
36 # include <sys/uio.h>
37 # include <unistd.h>
38
39 int
main(void)40 main(void)
41 {
42 tprintf("%s", "");
43
44 static char tmp[] = "preadv-pwritev-tmpfile";
45 if (open(tmp, O_CREAT|O_RDONLY|O_TRUNC, 0600) != 0)
46 perror_msg_and_fail("creat: %s", tmp);
47 if (open(tmp, O_WRONLY) != 1)
48 perror_msg_and_fail("open: %s", tmp);
49 if (unlink(tmp))
50 perror_msg_and_fail("unlink: %s", tmp);
51
52 static const char w0_c[] = "012";
53 const char *w0_d = hexdump_strdup(w0_c);
54 void *w0 = tail_memdup(w0_c, LENGTH_OF(w0_c));
55
56 const void *efault = w0 + LENGTH_OF(w0_c);
57
58 static const char w1_c[] = "34567";
59 const char *w1_d = hexdump_strdup(w1_c);
60 void *w1 = tail_memdup(w1_c, LENGTH_OF(w1_c));
61
62 static const char w2_c[] = "89abcde";
63 const char *w2_d = hexdump_strdup(w2_c);
64 void *w2 = tail_memdup(w2_c, LENGTH_OF(w2_c));
65
66 long rc;
67
68 rc = pwritev(1, efault, 42, 0);
69 tprintf("pwritev(1, %p, 42, 0) = %ld %s (%m)\n",
70 efault, rc, errno2name());
71
72 rc = preadv(0, efault, 42, 0);
73 tprintf("preadv(0, %p, 42, 0) = %ld %s (%m)\n",
74 efault, rc, errno2name());
75
76 static const char r0_c[] = "01234567";
77 const char *r0_d = hexdump_strdup(r0_c);
78 static const char r1_c[] = "89abcde";
79 const char *r1_d = hexdump_strdup(r1_c);
80
81 const struct iovec w_iov_[] = {
82 {
83 .iov_base = w0,
84 .iov_len = LENGTH_OF(w0_c)
85 }, {
86 .iov_base = w1,
87 .iov_len = LENGTH_OF(w1_c)
88 }, {
89 .iov_base = w2,
90 .iov_len = LENGTH_OF(w2_c)
91 }
92 };
93 const struct iovec *w_iov = tail_memdup(w_iov_, sizeof(w_iov_));
94
95 rc = pwritev(1, w_iov, 0, 0);
96 if (rc)
97 perror_msg_and_fail("pwritev: expected 0, returned %ld", rc);
98 tprintf("pwritev(1, [], 0, 0) = 0\n");
99
100 rc = pwritev(1, w_iov + ARRAY_SIZE(w_iov_) - 1, 2, 0);
101 tprintf("pwritev(1, [{iov_base=\"%s\", iov_len=%u}, %p], 2, 0)"
102 " = %ld %s (%m)\n",
103 w2_c, LENGTH_OF(w2_c), w_iov + ARRAY_SIZE(w_iov_),
104 rc, errno2name());
105
106 const unsigned int w_len =
107 LENGTH_OF(w0_c) + LENGTH_OF(w1_c) + LENGTH_OF(w2_c);
108
109 rc = pwritev(1, w_iov, ARRAY_SIZE(w_iov_), 0);
110 if (rc != (int) w_len)
111 perror_msg_and_fail("pwritev: expected %u, returned %ld",
112 w_len, rc);
113 close(1);
114 tprintf("pwritev(1, [{iov_base=\"%s\", iov_len=%u}"
115 ", {iov_base=\"%s\", iov_len=%u}"
116 ", {iov_base=\"%s\", iov_len=%u}], %u, 0) = %u\n"
117 " * %u bytes in buffer 0\n"
118 " | 00000 %-49s %-16s |\n"
119 " * %u bytes in buffer 1\n"
120 " | 00000 %-49s %-16s |\n"
121 " * %u bytes in buffer 2\n"
122 " | 00000 %-49s %-16s |\n",
123 w0_c, LENGTH_OF(w0_c), w1_c, LENGTH_OF(w1_c),
124 w2_c, LENGTH_OF(w2_c), ARRAY_SIZE(w_iov_), w_len,
125 LENGTH_OF(w0_c), w0_d, w0_c,
126 LENGTH_OF(w1_c), w1_d, w1_c, LENGTH_OF(w2_c), w2_d, w2_c);
127
128 const unsigned int r_len = (w_len + 1) / 2;
129 void *r0 = tail_alloc(r_len);
130 const struct iovec r0_iov_[] = {
131 {
132 .iov_base = r0,
133 .iov_len = r_len
134 }
135 };
136 const struct iovec *r_iov = tail_memdup(r0_iov_, sizeof(r0_iov_));
137
138 rc = preadv(0, r_iov, ARRAY_SIZE(r0_iov_), 0);
139 if (rc != (int) r_len)
140 perror_msg_and_fail("preadv: expected %u, returned %ld",
141 r_len, rc);
142 tprintf("preadv(0, [{iov_base=\"%s\", iov_len=%u}], %u, 0) = %u\n"
143 " * %u bytes in buffer 0\n"
144 " | 00000 %-49s %-16s |\n",
145 r0_c, r_len, ARRAY_SIZE(r0_iov_), r_len, r_len, r0_d, r0_c);
146
147 void *r1 = tail_alloc(r_len);
148 void *r2 = tail_alloc(w_len);
149 const struct iovec r1_iov_[] = {
150 {
151 .iov_base = r1,
152 .iov_len = r_len
153 },
154 {
155 .iov_base = r2,
156 .iov_len = w_len
157 }
158 };
159 r_iov = tail_memdup(r1_iov_, sizeof(r1_iov_));
160
161 rc = preadv(0, r_iov, ARRAY_SIZE(r1_iov_), r_len);
162 if (rc != (int) w_len - (int) r_len)
163 perror_msg_and_fail("preadv: expected %d, returned %ld",
164 (int) w_len - r_len, rc);
165 tprintf("preadv(0, [{iov_base=\"%s\", iov_len=%u}"
166 ", {iov_base=\"\", iov_len=%u}], %u, %u) = %u\n"
167 " * %u bytes in buffer 0\n"
168 " | 00000 %-49s %-16s |\n",
169 r1_c, r_len, w_len, ARRAY_SIZE(r1_iov_),
170 r_len, w_len - r_len,
171 w_len - r_len, r1_d, r1_c);
172 close(0);
173
174 tprintf("+++ exited with 0 +++\n");
175 return 0;
176 }
177
178 #else
179
180 SKIP_MAIN_UNDEFINED("HAVE_PREADV && HAVE_PWRITEV")
181
182 #endif
183