1 /* $NetBSD: popen.c,v 1.1 1999/09/30 09:23:23 tron Exp $ */
2
3 /*-
4 * Copyright (c) 1999 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Matthias Scheler.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32
33 #include <err.h>
34 #include <errno.h>
35 #include <paths.h>
36 #include <stdio.h>
37 #include <stdlib.h>
38 #include <limits.h>
39 #include <time.h>
40 #include <unistd.h>
41
42 #define _PATH_CAT "/bin/cat"
43 #define BUFSIZE (640*1024)
44 /* 640KB ought to be enough for everyone. */
45 #define DATAFILE "popen.data"
46
47 int
main(int argc,char ** argv)48 main(int argc, char **argv)
49 {
50 char *buffer, command[PATH_MAX];
51 int index, in;
52 FILE *pipe;
53
54 if ((buffer = malloc(BUFSIZE*sizeof(char))) == NULL)
55 err(1, NULL);
56
57 for (index=0; index<BUFSIZE; index++)
58 buffer[index]=arc4random();
59
60 (void)snprintf(command, sizeof(command), "%s >%s",
61 _PATH_CAT, DATAFILE);
62 if ((pipe = popen(command, "w")) == NULL)
63 err(1, "popen write");
64
65 if (fwrite(buffer, sizeof(char), BUFSIZE, pipe) != BUFSIZE)
66 err(1, "write");
67
68 if (pclose(pipe) == -1)
69 err(1, "pclose");
70
71 (void)snprintf(command, sizeof(command), "%s %s",
72 _PATH_CAT, DATAFILE);
73 if ((pipe = popen(command, "r")) == NULL)
74 err(1, "popen read");
75
76 index = 0;
77 while ((in = fgetc(pipe)) != EOF)
78 if (index == BUFSIZE) {
79 errno = EFBIG;
80 err(1, "read");
81 }
82 else
83 if ((char)in != buffer[index++]) {
84 errno = EINVAL;
85 err(1, "read");
86 }
87
88 if (index < BUFSIZE) {
89 errno = EIO;
90 err(1, "read");
91 }
92
93 if (pclose(pipe) == -1)
94 err(1, "pclose");
95
96 (void)unlink(DATAFILE);
97 return 0;
98 }
99