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