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DEFINITIONS
This source file includes following definitions.
- spawnv
- dowait
- triple
1 /*
2 * Copyright (c) 2000, 2001, 2002, 2003, 2004, 2005, 2008, 2009
3 * The President and Fellows of Harvard College.
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. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE UNIVERSITY AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE UNIVERSITY OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 /*
31 * triple.c
32 *
33 * Runs three copies of some subprogram.
34 */
35
36 #include <stdio.h>
37 #include <unistd.h>
38 #include <err.h>
39 #include "triple.h"
40
41 static
42 pid_t
43 spawnv(const char *prog, char **argv)
44 {
45 pid_t pid = fork();
46 switch (pid) {
47 case -1:
48 err(1, "fork");
49 case 0:
50 /* child */
51 execv(prog, argv);
52 err(1, "%s: execv", prog);
53 default:
54 /* parent */
55 break;
56 }
57 return pid;
58 }
59
60 static
61 int
62 dowait(int index, int pid)
63 {
64 int status;
65
66 if (waitpid(pid, &status, 0)<0) {
67 warn("waitpid for copy #%d (pid %d)", index, pid);
68 return 1;
69 }
70 else if (WIFSIGNALED(status)) {
71 warnx("copy #%d (pid %d): signal %d", index, pid,
72 WTERMSIG(status));
73 return 1;
74 }
75 else if (WEXITSTATUS(status) != 0) {
76 warnx("copy #%d (pid %d): exit %d", index, pid,
77 WEXITSTATUS(status));
78 return 1;
79 }
80 return 0;
81 }
82
83 void
84 triple(const char *prog)
85 {
86 pid_t pids[3];
87 int i, failures = 0;
88 char *args[2];
89
90 /* set up the argv */
91 args[0]=(char *)prog;
92 args[1]=NULL;
93
94 warnx("Starting: running three copies of %s...", prog);
95
96 for (i=0; i<3; i++) {
97 pids[i]=spawnv(args[0], args);
98 }
99
100 for (i=0; i<3; i++) {
101 failures += dowait(i, pids[i]);
102 }
103
104 if (failures > 0) {
105 warnx("%d failures", failures);
106 }
107 else {
108 warnx("Congratulations! You passed.");
109 }
110 }
111