155 lines
4.2 KiB
C
155 lines
4.2 KiB
C
/* $NetBSD: ioctl.c,v 1.2 2001/12/31 20:18:28 thorpej Exp $ */
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/*
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* Copyright (c) 2001 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 Andrew Brown.
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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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__RCSID("$NetBSD: ioctl.c,v 1.2 2001/12/31 20:18:28 thorpej Exp $");
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#endif
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#include <errno.h>
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#include <stdio.h>
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#include <termios.h>
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#include <signal.h>
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#include <unistd.h>
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#include <string.h>
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#include <stdlib.h>
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#include <err.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#if defined(__NetBSD__)
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#include <util.h>
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#elif defined(__bsdi__)
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int openpty(int *, int *, char *, struct termios *, struct winsize *);
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#elif defined(__FreeBSD__)
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#include <libutil.h>
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#else
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#error where openpty?
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#endif
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/* ARGSUSED */
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static void
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sigchld(int nsig)
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{
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if (wait(NULL) == -1)
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err(1, "wait");
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}
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/* ARGSUSED */
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int
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main(int argc, char *argv[])
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{
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int m, s, rc;
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char name[128], buf[128];
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struct termios term;
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struct sigaction sa;
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/* unbuffer stdout */
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setbuf(stdout, NULL);
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/* get terminal settings for later use */
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if (tcgetattr(STDIN_FILENO, &term) == -1)
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err(1, "tcgetattr");
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/* get a tty */
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if (openpty(&m, &s, name, &term, NULL) == -1)
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err(1, "openpty");
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switch (fork()) {
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case -1:
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err(1, "fork");
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/* NOTREACHED */
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case 0:
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/* wait for parent to get set up */
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(void) sleep(1);
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(void) printf("child1: exiting\n");
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exit(0);
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/* NOTREACHED */
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default:
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(void) printf("parent: spawned child1\n");
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break;
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}
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switch (fork()) {
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case -1:
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err(1, "fork");
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/* NOTREACHED */
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case 0:
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/* wait for parent to get upset */
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(void) sleep(2);
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/* drain the tty q */
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if (read(m, buf, sizeof(buf)) == -1)
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err(1, "read");
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(void) printf("child2: exiting\n");
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exit(0);
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/* NOTREACHED */
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default:
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(void) printf("parent: spawned child2\n");
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break;
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}
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/* set up a restarting signal handler */
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(void) sigemptyset(&sa.sa_mask);
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sa.sa_handler = sigchld;
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sa.sa_flags = SA_RESTART;
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if (sigaction(SIGCHLD, &sa, NULL) == -1)
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err(1, "sigaction");
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/* put something in the output q */
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if (write(s, "Hello world\n", 12) == -1)
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err(1, "write");
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/* ask for output to drain but don't drain it */
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rc = 0;
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if (tcsetattr(s, TCSADRAIN, &term) == -1) {
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(void) printf("parent: tcsetattr: %s\n", strerror(errno));
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rc = 1;
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}
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/* wait for last child */
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sa.sa_handler = SIG_DFL;
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if (sigaction(SIGCHLD, &sa, NULL) == -1)
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err(1, "sigaction");
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(void) wait(NULL);
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exit(rc);
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/* NOTREACHED */
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exit(rc);
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return 0;
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}
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