1/* 2 * Copyright (c) 1999, 2007 Apple Inc. All rights reserved. 3 * 4 * @APPLE_LICENSE_HEADER_START@ 5 * 6 * This file contains Original Code and/or Modifications of Original Code 7 * as defined in and that are subject to the Apple Public Source License 8 * Version 2.0 (the 'License'). You may not use this file except in 9 * compliance with the License. Please obtain a copy of the License at 10 * http://www.opensource.apple.com/apsl/ and read it before using this 11 * file. 12 * 13 * The Original Code and all software distributed under the License are 14 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 15 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 16 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 18 * Please see the License for the specific language governing rights and 19 * limitations under the License. 20 * 21 * @APPLE_LICENSE_HEADER_END@ 22 */ 23/* 24 * Copyright (c) 1990, 1993, 1994 25 * The Regents of the University of California. All rights reserved. 26 * 27 * Redistribution and use in source and binary forms, with or without 28 * modification, are permitted provided that the following conditions 29 * are met: 30 * 1. Redistributions of source code must retain the above copyright 31 * notice, this list of conditions and the following disclaimer. 32 * 2. Redistributions in binary form must reproduce the above copyright 33 * notice, this list of conditions and the following disclaimer in the 34 * documentation and/or other materials provided with the distribution. 35 * 3. All advertising materials mentioning features or use of this software 36 * must display the following acknowledgement: 37 * This product includes software developed by the University of 38 * California, Berkeley and its contributors. 39 * 4. Neither the name of the University nor the names of its contributors 40 * may be used to endorse or promote products derived from this software 41 * without specific prior written permission. 42 * 43 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 44 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 45 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 46 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 47 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 48 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 49 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 50 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 51 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 52 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 53 * SUCH DAMAGE. 54 */ 55 56 57#include <sys/types.h> 58#include <sys/ioctl.h> 59#include <sys/stat.h> 60 61#include <errno.h> 62#include <fcntl.h> 63#include <grp.h> 64#include <stdio.h> 65#include <stdlib.h> 66#include <string.h> 67#include <termios.h> 68#include <unistd.h> 69#include <util.h> 70#include <syslog.h> 71 72int openpty(amaster, aslave, name, termp, winp) 73 int *amaster, *aslave; 74 char *name; 75 struct termios *termp; 76 struct winsize *winp; 77{ 78 int master, slave; 79 char *sname; 80 81 if ((master = posix_openpt(O_RDWR|O_NOCTTY)) < 0) 82 return -1; 83 if (grantpt(master) < 0 || unlockpt(master) < 0 84 || (sname = ptsname(master)) == NULL 85 || (slave = open(sname, O_RDWR|O_NOCTTY, 0)) < 0) { 86 (void) close(master); 87 return -1; 88 } 89 *amaster = master; 90 *aslave = slave; 91 if (name) 92 strcpy(name, sname); 93 if (termp) 94 (void) tcsetattr(slave, TCSAFLUSH, termp); 95 if (winp) 96 (void) ioctl(slave, TIOCSWINSZ, (char *)winp); 97 return (0); 98} 99 100int 101forkpty(amaster, name, termp, winp) 102 int *amaster; 103 char *name; 104 struct termios *termp; 105 struct winsize *winp; 106{ 107 int master, slave, pid; 108 109 if (openpty(&master, &slave, name, termp, winp) == -1) 110 return (-1); 111 switch (pid = fork()) { 112 case -1: 113 return (-1); 114 case 0: 115 /* 116 * child 117 */ 118 (void) close(master); 119 /* 120 * 4300297: login_tty() may fail to set the controlling tty. 121 * Since we have already forked, the best we can do is to 122 * dup the slave as if login_tty() succeeded. 123 */ 124 if (login_tty(slave) < 0) { 125 syslog(LOG_ERR, "forkpty: login_tty could't make controlling tty"); 126 (void) dup2(slave, 0); 127 (void) dup2(slave, 1); 128 (void) dup2(slave, 2); 129 if (slave > 2) 130 (void) close(slave); 131 } 132 return (0); 133 } 134 /* 135 * parent 136 */ 137 *amaster = master; 138 (void) close(slave); 139 return (pid); 140} 141