1 /* 2 * Copyright (c) 2008 Nicholas Marriott <nicholas.marriott@gmail.com> 3 * 4 * Permission to use, copy, modify, and distribute this software for any 5 * purpose with or without fee is hereby granted, provided that the above 6 * copyright notice and this permission notice appear in all copies. 7 * 8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 12 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER 13 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING 14 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 15 */ 16 17 #include <sys/types.h> 18 #include <sys/ioctl.h> 19 20 #include <fcntl.h> 21 #include <stdlib.h> 22 #include <unistd.h> 23 24 #include "compat.h" 25 26 void fatal(const char *, ...); 27 void fatalx(const char *, ...); 28 29 pid_t 30 forkpty(int *master, char *name, struct termios *tio, struct winsize *ws) 31 { 32 int slave = -1; 33 char *path; 34 pid_t pid; 35 36 if ((*master = open("/dev/ptmx", O_RDWR|O_NOCTTY)) == -1) 37 return (-1); 38 if (grantpt(*master) != 0) 39 goto out; 40 if (unlockpt(*master) != 0) 41 goto out; 42 43 if ((path = ptsname(*master)) == NULL) 44 goto out; 45 if (name != NULL) 46 strlcpy(name, path, TTY_NAME_MAX); 47 if ((slave = open(path, O_RDWR|O_NOCTTY)) == -1) 48 goto out; 49 50 switch (pid = fork()) { 51 case -1: 52 goto out; 53 case 0: 54 close(*master); 55 56 setsid(); 57 if (ioctl(slave, TIOCSCTTY, NULL) == -1) 58 fatal("ioctl failed"); 59 60 if (tio != NULL && tcsetattr(slave, TCSAFLUSH, tio) == -1) 61 fatal("tcsetattr failed"); 62 if (ioctl(slave, TIOCSWINSZ, ws) == -1) 63 fatal("ioctl failed"); 64 65 dup2(slave, 0); 66 dup2(slave, 1); 67 dup2(slave, 2); 68 if (slave > 2) 69 close(slave); 70 return (0); 71 } 72 73 close(slave); 74 return (pid); 75 76 out: 77 if (*master != -1) 78 close(*master); 79 if (slave != -1) 80 close(slave); 81 return (-1); 82 } 83