- /* $OpenBSD: pty.c,v 1.21 2017/04/20 17:48:30 nicm Exp $ */
-
- /*-
- * Copyright (c) 1990, 1993
- * The Regents of the University of California. All rights reserved.
- *
- * 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.
- * 3. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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/types.h>
- #include <sys/stat.h>
- #include <sys/ioctl.h>
- #include <fcntl.h>
- #include <termios.h>
- #include <errno.h>
- #include <unistd.h>
- #include <stdio.h>
- #include <string.h>
- #include <grp.h>
- #include <sys/tty.h>
-
- #include "util.h"
-
- int
- getptmfd(void)
- {
- return (open(PATH_PTMDEV, O_RDWR|O_CLOEXEC));
- }
-
- int
- openpty(int *amaster, int *aslave, char *name, struct termios *termp,
- struct winsize *winp)
- {
- int ptmfd;
-
- if ((ptmfd = getptmfd()) == -1)
- return (-1);
- if (fdopenpty(ptmfd, amaster, aslave, name, termp, winp) == -1) {
- close(ptmfd);
- return (-1);
- }
- close(ptmfd);
- return (0);
- }
-
- int
- fdopenpty(int ptmfd, int *amaster, int *aslave, char *name,
- struct termios *termp, struct winsize *winp)
- {
- int master, slave;
- struct ptmget ptm;
-
- /*
- * Use /dev/ptm and the PTMGET ioctl to get a properly set up and
- * owned pty/tty pair.
- */
- if (ioctl(ptmfd, PTMGET, &ptm) == -1)
- return (-1);
-
- master = ptm.cfd;
- slave = ptm.sfd;
- if (name) {
- /*
- * Manual page says "at least 16 characters".
- */
- strlcpy(name, ptm.sn, 16);
- }
- *amaster = master;
- *aslave = slave;
- if (termp)
- (void) tcsetattr(slave, TCSAFLUSH, termp);
- if (winp)
- (void) ioctl(slave, TIOCSWINSZ, winp);
- return (0);
- }
-
- pid_t
- forkpty(int *amaster, char *name, struct termios *termp, struct winsize *winp)
- {
- int ptmfd;
- pid_t pid;
-
- if ((ptmfd = getptmfd()) == -1)
- return (-1);
- if ((pid = fdforkpty(ptmfd, amaster, name, termp, winp)) == -1) {
- close(ptmfd);
- return (-1);
- }
- close(ptmfd);
- return (pid);
- }
-
- pid_t
- fdforkpty(int ptmfd, int *amaster, char *name, struct termios *termp,
- struct winsize *winp)
- {
- int master, slave;
- pid_t pid;
-
- if (fdopenpty(ptmfd, &master, &slave, name, termp, winp) == -1)
- return (-1);
- switch (pid = fork()) {
- case -1:
- (void) close(master);
- (void) close(slave);
- return (-1);
- case 0:
- /*
- * child
- */
- (void) close(master);
- login_tty(slave);
- return (0);
- }
- /*
- * parent
- */
- *amaster = master;
- (void) close(slave);
- return (pid);
- }
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