1 /*
2 * Copyright (c) 2015 Dmitry V. Levin <ldv@altlinux.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. The name of the author may not be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #include <assert.h>
29 #include <string.h>
30 #include <unistd.h>
31 #include <sys/socket.h>
32 #include <sys/wait.h>
33
34 static void
transpose(char * str,int len)35 transpose(char *str, int len)
36 {
37 int i;
38
39 for (i = 0; i < len / 2; ++i) {
40 char c = str[i];
41 str[i] = str[len - 1 - i];
42 str[len - 1 - i] = c;
43 }
44 }
45
46 int
main(int ac,char ** av)47 main(int ac, char **av)
48 {
49 assert(ac == 2);
50 const int len = strlen(av[1]);
51 assert(len);
52
53 (void) close(0);
54 (void) close(1);
55
56 int sv[2];
57 assert(socketpair(AF_UNIX, SOCK_STREAM, 0, sv) == 0);
58 assert(sv[0] == 0);
59 assert(sv[1] == 1);
60
61 pid_t pid = fork();
62 assert(pid >= 0);
63
64 if (pid) {
65 assert(close(1) == 0);
66 transpose(av[1], len);
67 assert(sendto(0, av[1], len, MSG_DONTROUTE, NULL, 0) == len);
68 assert(recvfrom(0, av[1], len, MSG_WAITALL, NULL, NULL) == len);
69 assert(close(0) == 0);
70
71 int status;
72 assert(waitpid(pid, &status, 0) == pid);
73 assert(status == 0);
74 } else {
75 assert(close(0) == 0);
76 assert(recvfrom(1, av[1], len, MSG_WAITALL, NULL, NULL) == len);
77 transpose(av[1], len);
78 assert(sendto(1, av[1], len, MSG_DONTROUTE, NULL, 0) == len);
79 assert(recvfrom(1, av[1], len, MSG_WAITALL, NULL, NULL) == 0);
80 assert(close(1) == 0);
81 }
82
83 return 0;
84 }
85