1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0 2*4882a593Smuzhiyun /* 3*4882a593Smuzhiyun * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) 4*4882a593Smuzhiyun */ 5*4882a593Smuzhiyun 6*4882a593Smuzhiyun #include <stdlib.h> 7*4882a593Smuzhiyun #include <unistd.h> 8*4882a593Smuzhiyun #include <errno.h> 9*4882a593Smuzhiyun #include <fcntl.h> 10*4882a593Smuzhiyun #include <kern_util.h> 11*4882a593Smuzhiyun #include <os.h> 12*4882a593Smuzhiyun 13*4882a593Smuzhiyun struct grantpt_info { 14*4882a593Smuzhiyun int fd; 15*4882a593Smuzhiyun int res; 16*4882a593Smuzhiyun int err; 17*4882a593Smuzhiyun }; 18*4882a593Smuzhiyun grantpt_cb(void * arg)19*4882a593Smuzhiyunstatic void grantpt_cb(void *arg) 20*4882a593Smuzhiyun { 21*4882a593Smuzhiyun struct grantpt_info *info = arg; 22*4882a593Smuzhiyun 23*4882a593Smuzhiyun info->res = grantpt(info->fd); 24*4882a593Smuzhiyun info->err = errno; 25*4882a593Smuzhiyun } 26*4882a593Smuzhiyun get_pty(void)27*4882a593Smuzhiyunint get_pty(void) 28*4882a593Smuzhiyun { 29*4882a593Smuzhiyun struct grantpt_info info; 30*4882a593Smuzhiyun int fd, err; 31*4882a593Smuzhiyun 32*4882a593Smuzhiyun fd = open("/dev/ptmx", O_RDWR); 33*4882a593Smuzhiyun if (fd < 0) { 34*4882a593Smuzhiyun err = -errno; 35*4882a593Smuzhiyun printk(UM_KERN_ERR "get_pty : Couldn't open /dev/ptmx - " 36*4882a593Smuzhiyun "err = %d\n", errno); 37*4882a593Smuzhiyun return err; 38*4882a593Smuzhiyun } 39*4882a593Smuzhiyun 40*4882a593Smuzhiyun info.fd = fd; 41*4882a593Smuzhiyun initial_thread_cb(grantpt_cb, &info); 42*4882a593Smuzhiyun 43*4882a593Smuzhiyun if (info.res < 0) { 44*4882a593Smuzhiyun err = -info.err; 45*4882a593Smuzhiyun printk(UM_KERN_ERR "get_pty : Couldn't grant pty - " 46*4882a593Smuzhiyun "errno = %d\n", -info.err); 47*4882a593Smuzhiyun goto out; 48*4882a593Smuzhiyun } 49*4882a593Smuzhiyun 50*4882a593Smuzhiyun if (unlockpt(fd) < 0) { 51*4882a593Smuzhiyun err = -errno; 52*4882a593Smuzhiyun printk(UM_KERN_ERR "get_pty : Couldn't unlock pty - " 53*4882a593Smuzhiyun "errno = %d\n", errno); 54*4882a593Smuzhiyun goto out; 55*4882a593Smuzhiyun } 56*4882a593Smuzhiyun return fd; 57*4882a593Smuzhiyun out: 58*4882a593Smuzhiyun close(fd); 59*4882a593Smuzhiyun return err; 60*4882a593Smuzhiyun } 61