119 lines
3.6 KiB
C
119 lines
3.6 KiB
C
/* $NetBSD: popen.c,v 1.1.1.1 1999/09/30 09:23:23 tron Exp $ */
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/*-
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* Copyright (c) 1999 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Matthias Scheler.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT("@(#) Copyright (c) 1999 The NetBSD Foundation, Inc.\n\
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All rights reserved.\n");
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#endif /* not lint */
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#ifndef lint
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__RCSID("$NetBSD: popen.c,v 1.1.1.1 1999/09/30 09:23:23 tron Exp $");
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#endif /* not lint */
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#include <sys/param.h>
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#include <errno.h>
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#include <paths.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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#include <unistd.h>
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#define _PATH_CAT "/bin/cat"
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#define BUFSIZE (640*1024)
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/* 640KB ought to be enough for everyone. */
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#define DATAFILE "popen.data"
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int main __P((int, char *[]));
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main(argc, argv)
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int argc;
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char *argv[];
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{
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char *buffer, command[MAXPATHLEN];
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int index, in;
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FILE *pipe;
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if ((buffer = malloc(BUFSIZE*sizeof(char))) == NULL)
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err(1, NULL);
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srand ((unsigned int)time(NULL));
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for (index=0; index<BUFSIZE; index++)
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buffer[index]=(char)rand();
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(void)snprintf(command, sizeof(command), "%s >%s",
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_PATH_CAT, DATAFILE);
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if ((pipe = popen(command, "w")) == NULL)
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err(1, "popen write");
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if (fwrite(buffer, sizeof(char), BUFSIZE, pipe) != BUFSIZE)
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err(1, "write");
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if (pclose(pipe) == -1)
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err(1, "pclose");
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(void)snprintf(command, sizeof(command), "%s %s",
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_PATH_CAT, DATAFILE);
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if ((pipe = popen(command, "r")) == NULL)
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err(1, "popen read");
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index = 0;
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while ((in = fgetc(pipe)) != EOF)
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if (index == BUFSIZE) {
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errno = EFBIG;
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err(1, "read");
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}
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else
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if ((char)in != buffer[index++]) {
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errno = EINVAL;
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err(1, "read");
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}
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if (index < BUFSIZE) {
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errno = EIO;
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err(1, "read");
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}
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if (pclose(pipe) == -1)
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err(1, "pclose");
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(void)unlink(DATAFILE);
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return 0;
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}
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