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 * 3. 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 * @(#)pty.c 8.3 (Berkeley) 5/16/94 30 * $FreeBSD: head/lib/libutil/pty.c 184634 2008-11-04 13:50:50Z des $ 31 */ 32 33 #include <sys/types.h> 34 #include <sys/ioctl.h> 35 #include <sys/stat.h> 36 37 #include <errno.h> 38 #include <fcntl.h> 39 #include <grp.h> 40 #include <libutil.h> 41 #include <stdlib.h> 42 #include <string.h> 43 #include <termios.h> 44 #include <unistd.h> 45 46 int 47 openpty(int *amaster, int *aslave, char *name, struct termios *termp, 48 struct winsize *winp) 49 { 50 const char *slavename; 51 int master, slave; 52 53 master = posix_openpt(O_RDWR|O_NOCTTY); 54 if (master == -1) 55 return (-1); 56 57 if (grantpt(master) == -1) 58 goto bad; 59 60 if (unlockpt(master) == -1) 61 goto bad; 62 63 slavename = ptsname(master); 64 if (slavename == NULL) 65 goto bad; 66 67 slave = open(slavename, O_RDWR); 68 if (slave == -1) 69 goto bad; 70 71 *amaster = master; 72 *aslave = slave; 73 74 if (name) 75 strcpy(name, slavename); 76 if (termp) 77 tcsetattr(slave, TCSAFLUSH, termp); 78 if (winp) 79 ioctl(slave, TIOCSWINSZ, (char *)winp); 80 81 return (0); 82 83 bad: close(master); 84 return (-1); 85 } 86 87 int 88 forkpty(int *amaster, char *name, struct termios *termp, struct winsize *winp) 89 { 90 int master, slave, pid; 91 92 if (openpty(&master, &slave, name, termp, winp) == -1) 93 return (-1); 94 switch (pid = fork()) { 95 case -1: 96 (void) close(slave); 97 return (-1); 98 case 0: 99 /* 100 * child 101 */ 102 (void) close(master); 103 login_tty(slave); 104 return (0); 105 } 106 /* 107 * parent 108 */ 109 *amaster = master; 110 (void) close(slave); 111 return (pid); 112 } 113