1 /* 2 * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) 3 * Licensed under the GPL 4 */ 5 6 #include <stdlib.h> 7 #include <unistd.h> 8 #include <errno.h> 9 #include <fcntl.h> 10 #include "kern_constants.h" 11 #include "kern_util.h" 12 #include "os.h" 13 #include "user.h" 14 15 struct grantpt_info { 16 int fd; 17 int res; 18 int err; 19 }; 20 21 static void grantpt_cb(void *arg) 22 { 23 struct grantpt_info *info = arg; 24 25 info->res = grantpt(info->fd); 26 info->err = errno; 27 } 28 29 int get_pty(void) 30 { 31 struct grantpt_info info; 32 int fd, err; 33 34 fd = open("/dev/ptmx", O_RDWR); 35 if (fd < 0) { 36 err = -errno; 37 printk(UM_KERN_ERR "get_pty : Couldn't open /dev/ptmx - " 38 "err = %d\n", errno); 39 return err; 40 } 41 42 info.fd = fd; 43 initial_thread_cb(grantpt_cb, &info); 44 45 if (info.res < 0) { 46 err = -info.err; 47 printk(UM_KERN_ERR "get_pty : Couldn't grant pty - " 48 "errno = %d\n", -info.err); 49 goto out; 50 } 51 52 if (unlockpt(fd) < 0) { 53 err = -errno; 54 printk(UM_KERN_ERR "get_pty : Couldn't unlock pty - " 55 "errno = %d\n", errno); 56 goto out; 57 } 58 return fd; 59 out: 60 close(fd); 61 return err; 62 } 63