pty.c revision 184634
119914Swollman/*- 250476Speter * Copyright (c) 1990, 1993, 1994 31558Srgrimes * The Regents of the University of California. All rights reserved. 4156905Sru * 5156905Sru * Redistribution and use in source and binary forms, with or without 61558Srgrimes * modification, are permitted provided that the following conditions 725451Speter * are met: 8138593Ssam * 1. Redistributions of source code must retain the above copyright 925451Speter * notice, this list of conditions and the following disclaimer. 10138593Ssam * 2. Redistributions in binary form must reproduce the above copyright 11138593Ssam * notice, this list of conditions and the following disclaimer in the 12138593Ssam * documentation and/or other materials provided with the distribution. 13138593Ssam * 4. Neither the name of the University nor the names of its contributors 14138593Ssam * may be used to endorse or promote products derived from this software 15138593Ssam * without specific prior written permission. 16138593Ssam * 17138593Ssam * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18222527Sbz * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19138593Ssam * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20222527Sbz * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21222527Sbz * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22138593Ssam * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23222527Sbz * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24138593Ssam * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25222527Sbz * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26197138Shrs * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27222527Sbz * SUCH DAMAGE. 2844764Swpaul */ 29138593Ssam 30138593Ssam#include <sys/cdefs.h> 31138593Ssam__FBSDID("$FreeBSD: head/lib/libutil/pty.c 184634 2008-11-04 13:50:50Z des $"); 32223735Sbz 33138593Ssam#if defined(LIBC_SCCS) && !defined(lint) 34181224Sthompsa#if 0 35193664Shrsstatic char sccsid[] = "@(#)pty.c 8.3 (Berkeley) 5/16/94"; 3677217Sphk#endif 37178354Ssam#endif /* LIBC_SCCS and not lint */ 38204329Sru 39194871Sjamie#include <sys/types.h> 40178354Ssam#include <sys/ioctl.h> 41228577Sglebius#include <sys/stat.h> 42159781Smlaier 43142215Sglebius#include <errno.h> 44142215Sglebius#include <fcntl.h> 45146987Sthompsa#include <grp.h> 46168793Sthompsa#include <libutil.h> 47146987Sthompsa#include <stdlib.h> 48222527Sbz#include <string.h> 49222527Sbz#include <termios.h> 50222527Sbz#include <unistd.h> 51222527Sbz 52222527Sbzint 53222527Sbzopenpty(int *amaster, int *aslave, char *name, struct termios *termp, 54156905Sru struct winsize *winp) 55138593Ssam{ 56178354Ssam const char *slavename; 57178354Ssam int master, slave; 5880057Sobrien 5980057Sobrien master = posix_openpt(O_RDWR|O_NOCTTY); 60138593Ssam if (master == -1) 61138593Ssam return (-1); 62144130Sbrooks 63202532Sed if (grantpt(master) == -1) 641558Srgrimes goto bad; 651558Srgrimes 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 89bad: close(master); 90 return (-1); 91} 92 93int 94forkpty(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