1 /*
2 Copyright (C) 2004 Michael J. Silbersack. All rights reserved.
3
4 Redistribution and use in source and binary forms, with or without
5 modification, are permitted provided that the following conditions
6 are met:
7 1. Redistributions of source code must retain the above copyright
8 notice, this list of conditions and the following disclaimer.
9 2. Redistributions in binary form must reproduce the above copyright
10 notice, this list of conditions and the following disclaimer in the
11 documentation and/or other materials provided with the distribution.
12
13 THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
17 FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23 SUCH DAMAGE.
24 */
25
26 #include <sys/types.h>
27 #include <sys/stat.h>
28 #include <sys/wait.h>
29 #include <assert.h>
30 #include <err.h>
31 #include <errno.h>
32 #include <stdio.h>
33 #include <stdlib.h>
34 #include <string.h>
35 #include <unistd.h>
36
37 /*
38 * $FreeBSD$
39 * This program simply tests writing through the reverse direction of
40 * a pipe. Nothing too fancy, it's only needed because most pipe-using
41 * programs never touch the reverse direction (it doesn't exist on
42 * Linux.)
43 */
44
45 int
main(void)46 main(void)
47 {
48 char buffer[65535], buffer2[65535], go[] = "go", go2[] = "go2";
49 int desc[2], ipc_coord[2];
50 size_t i;
51 ssize_t total;
52 int buggy, error;
53 pid_t new_pid;
54
55 buggy = 0;
56 total = 0;
57
58 error = pipe(desc);
59 if (error == -1)
60 err(1, "Couldn't allocate data pipe");
61
62 error = pipe(ipc_coord);
63 if (error == -1)
64 err(1, "Couldn't allocate IPC coordination pipe");
65
66 buffer[0] = 'A';
67
68 for (i = 1; i < (int)sizeof(buffer); i++) {
69 buffer[i] = buffer[i - 1] + 1;
70 if (buffer[i] > 'Z')
71 buffer[i] = 'A';
72 }
73
74 new_pid = fork();
75 assert(new_pid != -1);
76
77 #define SYNC_R(i, _buf) do { \
78 int _error = errno; \
79 warnx("%d: waiting for synchronization", __LINE__); \
80 if (read(ipc_coord[i], &_buf, sizeof(_buf)) != sizeof(_buf)) \
81 err(1, "failed to synchronize (%s)", (i == 0 ? "parent" : "child")); \
82 errno = _error; \
83 } while(0)
84
85 #define SYNC_W(i, _buf) do { \
86 int _error = errno; \
87 warnx("%d: sending synchronization", __LINE__); \
88 if (write(ipc_coord[i], &_buf, sizeof(_buf)) != sizeof(_buf)) \
89 err(1, "failed to synchronize (%s)", (i == 0 ? "child" : "parent")); \
90 errno = _error; \
91 } while(0)
92
93 #define WRITE(s) do { \
94 ssize_t _size; \
95 if ((_size = write(desc[1], &buffer[total], s)) != s) \
96 warn("short write; wrote %zd, expected %d", _size, s); \
97 total += _size; \
98 } while(0)
99
100 if (new_pid == 0) {
101 SYNC_R(0, go);
102 for (i = 0; i < 8; i++)
103 WRITE(4096);
104
105 SYNC_W(0, go2);
106 SYNC_R(0, go);
107
108 for (i = 0; i < 2; i++)
109 WRITE(4096);
110
111 SYNC_W(0, go2);
112
113 _exit(0);
114 }
115
116 SYNC_W(1, go);
117 SYNC_R(1, go2);
118
119 error = read(desc[0], &buffer2, 8 * 4096);
120 total += error;
121 printf("Read %d bytes\n", error);
122
123 SYNC_W(1, go);
124 SYNC_R(1, go2);
125
126 error = read(desc[0], &buffer2[total], 2 * 4096);
127 total += error;
128 printf("Read %d bytes, done\n", error);
129
130 if (memcmp(buffer, buffer2, total) != 0) {
131 for (i = 0; i < (size_t)total; i++) {
132 if (buffer[i] != buffer2[i]) {
133 buggy = 1;
134 printf("Location %zu input: %hhx "
135 "output: %hhx\n",
136 i, buffer[i], buffer2[i]);
137 }
138 }
139 }
140
141 waitpid(new_pid, NULL, 0);
142
143 if ((buggy == 1) || (total != 10 * 4096))
144 errx(1, "FAILED");
145 else
146 printf("SUCCESS\n");
147
148 exit(0);
149 }
150