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 35 #if defined(LIBC_SCCS) && !defined(lint) 36 #if 0 37 static char sccsid[] = "@(#)pty.c 8.3 (Berkeley) 5/16/94"; 38 #endif 39 #endif /* LIBC_SCCS and not lint */ 40 41 #include <sys/types.h> 42 #include <sys/ioctl.h> 43 #include <sys/stat.h> 44 45 #include <errno.h> 46 #include <fcntl.h> 47 #include <grp.h> 48 #include <libutil.h> 49 #include <stdlib.h> 50 #include <string.h> 51 #include <termios.h> 52 #include <unistd.h> 53 54 int 55 openpty(int *amaster, int *aslave, char *name, struct termios *termp, 56 struct winsize *winp) 57 { 58 const char *slavename; 59 int master, slave; 60 61 master = posix_openpt(O_RDWR|O_NOCTTY); 62 if (master == -1) 63 return (-1); 64 65 if (grantpt(master) == -1) 66 goto bad; 67 68 if (unlockpt(master) == -1) 69 goto bad; 70 71 slavename = ptsname(master); 72 if (slavename == NULL) 73 goto bad; 74 75 slave = open(slavename, O_RDWR); 76 if (slave == -1) 77 goto bad; 78 79 *amaster = master; 80 *aslave = slave; 81 82 if (name) 83 strcpy(name, slavename); 84 if (termp) 85 tcsetattr(slave, TCSAFLUSH, termp); 86 if (winp) 87 ioctl(slave, TIOCSWINSZ, (char *)winp); 88 89 return (0); 90 91 bad: close(master); 92 return (-1); 93 } 94 95 int 96 forkpty(int *amaster, char *name, struct termios *termp, struct winsize *winp) 97 { 98 int master, slave, pid; 99 100 if (openpty(&master, &slave, name, termp, winp) == -1) 101 return (-1); 102 switch (pid = fork()) { 103 case -1: 104 (void)close(slave); 105 return (-1); 106 case 0: 107 /* 108 * child 109 */ 110 (void)close(master); 111 login_tty(slave); 112 return (0); 113 } 114 /* 115 * parent 116 */ 117 *amaster = master; 118 (void) close(slave); 119 return (pid); 120 } 121