1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1990, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __FBSDID("$FreeBSD$"); 34 __SCCSID("@(#)pty.c 8.3 (Berkeley) 5/16/94"); 35 36 #include <sys/types.h> 37 #include <sys/ioctl.h> 38 #include <sys/stat.h> 39 40 #include <errno.h> 41 #include <fcntl.h> 42 #include <grp.h> 43 #include <libutil.h> 44 #include <stdlib.h> 45 #include <string.h> 46 #include <termios.h> 47 #include <unistd.h> 48 49 int 50 openpty(int *amaster, int *aslave, char *name, struct termios *termp, 51 struct winsize *winp) 52 { 53 const char *slavename; 54 int master, slave; 55 56 master = posix_openpt(O_RDWR|O_NOCTTY); 57 if (master == -1) 58 return (-1); 59 60 if (grantpt(master) == -1) 61 goto bad; 62 63 if (unlockpt(master) == -1) 64 goto bad; 65 66 slavename = ptsname(master); 67 if (slavename == NULL) 68 goto bad; 69 70 slave = open(slavename, O_RDWR); 71 if (slave == -1) 72 goto bad; 73 74 *amaster = master; 75 *aslave = slave; 76 77 if (name) 78 strcpy(name, slavename); 79 if (termp) 80 tcsetattr(slave, TCSAFLUSH, termp); 81 if (winp) 82 ioctl(slave, TIOCSWINSZ, (char *)winp); 83 84 return (0); 85 86 bad: close(master); 87 return (-1); 88 } 89 90 int 91 forkpty(int *amaster, char *name, struct termios *termp, struct winsize *winp) 92 { 93 int master, slave, pid; 94 95 if (openpty(&master, &slave, name, termp, winp) == -1) 96 return (-1); 97 switch (pid = fork()) { 98 case -1: 99 (void)close(slave); 100 return (-1); 101 case 0: 102 /* 103 * child 104 */ 105 (void)close(master); 106 login_tty(slave); 107 return (0); 108 } 109 /* 110 * parent 111 */ 112 *amaster = master; 113 (void) close(slave); 114 return (pid); 115 } 116