1 /*- 2 * Copyright (c) 1990, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 #if defined(LIBC_SCCS) && !defined(lint) 34 #if 0 35 static char sccsid[] = "@(#)pty.c 8.3 (Berkeley) 5/16/94"; 36 #endif 37 #endif /* LIBC_SCCS and not lint */ 38 39 #include <sys/types.h> 40 #include <sys/ioctl.h> 41 #include <sys/stat.h> 42 43 #include <errno.h> 44 #include <fcntl.h> 45 #include <grp.h> 46 #include <libutil.h> 47 #include <stdlib.h> 48 #include <string.h> 49 #include <termios.h> 50 #include <unistd.h> 51 52 int 53 openpty(int *amaster, int *aslave, char *name, struct termios *termp, 54 struct winsize *winp) 55 { 56 const char *slavename; 57 int master, slave; 58 59 master = posix_openpt(O_RDWR|O_NOCTTY); 60 if (master == -1) 61 return (-1); 62 63 if (grantpt(master) == -1) 64 goto bad; 65 66 if (unlockpt(master) == -1) 67 goto bad; 68 69 slavename = ptsname(master); 70 if (slavename == NULL) 71 goto bad; 72 73 slave = open(slavename, O_RDWR); 74 if (slave == -1) 75 goto bad; 76 77 *amaster = master; 78 *aslave = slave; 79 80 if (name) 81 strcpy(name, slavename); 82 if (termp) 83 tcsetattr(slave, TCSAFLUSH, termp); 84 if (winp) 85 ioctl(slave, TIOCSWINSZ, (char *)winp); 86 87 return (0); 88 89 bad: close(master); 90 return (-1); 91 } 92 93 int 94 forkpty(int *amaster, char *name, struct termios *termp, struct winsize *winp) 95 { 96 int master, slave, pid; 97 98 if (openpty(&master, &slave, name, termp, winp) == -1) 99 return (-1); 100 switch (pid = fork()) { 101 case -1: 102 return (-1); 103 case 0: 104 /* 105 * child 106 */ 107 (void) close(master); 108 login_tty(slave); 109 return (0); 110 } 111 /* 112 * parent 113 */ 114 *amaster = master; 115 (void) close(slave); 116 return (pid); 117 } 118