/* $OpenBSD: pty.c,v 1.19 2013/05/21 19:07:02 matthew 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 openpty(int *amaster, int *aslave, char *name, struct termios *termp, struct winsize *winp) { int master, slave, fd; struct ptmget ptm; /* * Use /dev/ptm and the PTMGET ioctl to get a properly set up and * owned pty/tty pair. */ fd = open(PATH_PTMDEV, O_RDWR, 0); if (fd == -1) return (-1); if ((ioctl(fd, PTMGET, &ptm) == -1)) { close(fd); return (-1); } close(fd); 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 master, slave; pid_t pid; if (openpty(&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); }