regress/lib/libc/popen/popen.c

   1 /*      $NetBSD: popen.c,v 1.3 2008/04/28 20:23:05 martin 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 #include <sys/cdefs.h>
  33 #ifndef lint
  34 __COPYRIGHT("@(#) Copyright (c) 1999\
  35  The NetBSD Foundation, Inc.  All rights reserved.");
  36 #endif /* not lint */
  37
  38 #ifndef lint
  39 __RCSID("$NetBSD: popen.c,v 1.3 2008/04/28 20:23:05 martin Exp $");
  40 #endif /* not lint */
  41
  42 #include <sys/param.h>
  43
  44 #include <errno.h>
  45 #include <paths.h>
  46 #include <stdio.h>
  47 #include <stdlib.h>
  48 #include <time.h>
  49 #include <unistd.h>
  50
  51 #define _PATH_CAT       "/bin/cat"
  52 #define BUFSIZE         (640*1024)
  53                         /* 640KB ought to be enough for everyone. */
  54 #define DATAFILE        "popen.data"
  55
  56 int     main(int, char *[]);
  57
  58 main(argc, argv)
  59         int argc;
  60         char *argv[];
  61 {
  62         char *buffer, command[MAXPATHLEN];
  63         int index, in;
  64         FILE *pipe;
  65
  66         if ((buffer = malloc(BUFSIZE*sizeof(char))) == NULL)
  67             err(1, NULL);
  68
  69         srand ((unsigned int)time(NULL));
  70         for (index=0; index<BUFSIZE; index++)
  71             buffer[index]=(char)rand();
  72
  73         (void)snprintf(command, sizeof(command), "%s >%s",
  74                        _PATH_CAT, DATAFILE);
  75         if ((pipe = popen(command, "w")) == NULL)
  76             err(1, "popen write");
  77
  78         if (fwrite(buffer, sizeof(char), BUFSIZE, pipe) != BUFSIZE)
  79             err(1, "write");
  80
  81         if (pclose(pipe) == -1)
  82             err(1, "pclose");
  83
  84         (void)snprintf(command, sizeof(command), "%s %s",
  85                        _PATH_CAT, DATAFILE);
  86         if ((pipe = popen(command, "r")) == NULL)
  87             err(1, "popen read");
  88
  89         index = 0;
  90         while ((in = fgetc(pipe)) != EOF)
  91             if (index == BUFSIZE) {
  92                 errno = EFBIG;
  93                 err(1, "read");
  94             }
  95             else
  96                 if ((char)in != buffer[index++]) {
  97                     errno = EINVAL;
  98                     err(1, "read");
  99                 }
 100
 101         if (index < BUFSIZE) {
 102             errno = EIO;
 103             err(1, "read");
 104         }
 105
 106         if (pclose(pipe) == -1)
 107             err(1, "pclose");
 108
 109         (void)unlink(DATAFILE);
 110         return 0;
 111 }