GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libutil/pty.c Lines: 32 45 71.1 %
Date: 2017-11-13 Branches: 12 21 57.1 %

Line Branch Exec Source
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/*	$OpenBSD: pty.c,v 1.21 2017/04/20 17:48:30 nicm Exp $	*/
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/*-
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 * Copyright (c) 1990, 1993
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 *	The Regents of the University of California.  All rights reserved.
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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. Neither the name of the University nor the names of its contributors
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 *    may be used to endorse or promote products derived from this software
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 *    without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 * SUCH DAMAGE.
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 */
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/ioctl.h>
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#include <fcntl.h>
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#include <termios.h>
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#include <errno.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <string.h>
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#include <grp.h>
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#include <sys/tty.h>
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#include "util.h"
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int
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getptmfd(void)
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{
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	return (open(PATH_PTMDEV, O_RDWR|O_CLOEXEC));
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}
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int
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openpty(int *amaster, int *aslave, char *name, struct termios *termp,
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    struct winsize *winp)
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{
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	int ptmfd;
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	if ((ptmfd = getptmfd()) == -1)
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		return (-1);
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	if (fdopenpty(ptmfd, amaster, aslave, name, termp, winp) == -1) {
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		close(ptmfd);
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		return (-1);
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	}
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	close(ptmfd);
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	return (0);
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}
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int
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fdopenpty(int ptmfd, int *amaster, int *aslave, char *name,
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    struct termios *termp, struct winsize *winp)
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{
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	int master, slave;
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	struct ptmget ptm;
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	/*
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	 * Use /dev/ptm and the PTMGET ioctl to get a properly set up and
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	 * owned pty/tty pair.
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	 */
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	if (ioctl(ptmfd, PTMGET, &ptm) == -1)
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		return (-1);
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	master = ptm.cfd;
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	slave = ptm.sfd;
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	if (name) {
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		/*
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		 * Manual page says "at least 16 characters".
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		 */
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		strlcpy(name, ptm.sn, 16);
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	}
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	*amaster = master;
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	*aslave = slave;
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	if (termp)
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		(void) tcsetattr(slave, TCSAFLUSH, termp);
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	if (winp)
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		(void) ioctl(slave, TIOCSWINSZ, winp);
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	return (0);
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}
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pid_t
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forkpty(int *amaster, char *name, struct termios *termp, struct winsize *winp)
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{
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	int ptmfd;
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	pid_t pid;
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	if ((ptmfd = getptmfd()) == -1)
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		return (-1);
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	if ((pid = fdforkpty(ptmfd, amaster, name, termp, winp)) == -1) {
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		close(ptmfd);
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		return (-1);
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	}
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	close(ptmfd);
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	return (pid);
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}
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pid_t
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fdforkpty(int ptmfd, int *amaster, char *name, struct termios *termp,
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    struct winsize *winp)
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{
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	int master, slave;
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	pid_t pid;
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	if (fdopenpty(ptmfd, &master, &slave, name, termp, winp) == -1)
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		return (-1);
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	switch (pid = fork()) {
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	case -1:
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		(void) close(master);
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		(void) close(slave);
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		return (-1);
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	case 0:
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		/*
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		 * child
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		 */
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		(void) close(master);
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		login_tty(slave);
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		return (0);
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	}
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	/*
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	 * parent
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	 */
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	*amaster = master;
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	(void) close(slave);
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	return (pid);
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}