18c2ecf20Sopenharmony_ci// SPDX-License-Identifier: GPL-2.0 28c2ecf20Sopenharmony_ci/* 38c2ecf20Sopenharmony_ci * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) 48c2ecf20Sopenharmony_ci */ 58c2ecf20Sopenharmony_ci 68c2ecf20Sopenharmony_ci#include <stdlib.h> 78c2ecf20Sopenharmony_ci#include <unistd.h> 88c2ecf20Sopenharmony_ci#include <errno.h> 98c2ecf20Sopenharmony_ci#include <fcntl.h> 108c2ecf20Sopenharmony_ci#include <kern_util.h> 118c2ecf20Sopenharmony_ci#include <os.h> 128c2ecf20Sopenharmony_ci 138c2ecf20Sopenharmony_cistruct grantpt_info { 148c2ecf20Sopenharmony_ci int fd; 158c2ecf20Sopenharmony_ci int res; 168c2ecf20Sopenharmony_ci int err; 178c2ecf20Sopenharmony_ci}; 188c2ecf20Sopenharmony_ci 198c2ecf20Sopenharmony_cistatic void grantpt_cb(void *arg) 208c2ecf20Sopenharmony_ci{ 218c2ecf20Sopenharmony_ci struct grantpt_info *info = arg; 228c2ecf20Sopenharmony_ci 238c2ecf20Sopenharmony_ci info->res = grantpt(info->fd); 248c2ecf20Sopenharmony_ci info->err = errno; 258c2ecf20Sopenharmony_ci} 268c2ecf20Sopenharmony_ci 278c2ecf20Sopenharmony_ciint get_pty(void) 288c2ecf20Sopenharmony_ci{ 298c2ecf20Sopenharmony_ci struct grantpt_info info; 308c2ecf20Sopenharmony_ci int fd, err; 318c2ecf20Sopenharmony_ci 328c2ecf20Sopenharmony_ci fd = open("/dev/ptmx", O_RDWR); 338c2ecf20Sopenharmony_ci if (fd < 0) { 348c2ecf20Sopenharmony_ci err = -errno; 358c2ecf20Sopenharmony_ci printk(UM_KERN_ERR "get_pty : Couldn't open /dev/ptmx - " 368c2ecf20Sopenharmony_ci "err = %d\n", errno); 378c2ecf20Sopenharmony_ci return err; 388c2ecf20Sopenharmony_ci } 398c2ecf20Sopenharmony_ci 408c2ecf20Sopenharmony_ci info.fd = fd; 418c2ecf20Sopenharmony_ci initial_thread_cb(grantpt_cb, &info); 428c2ecf20Sopenharmony_ci 438c2ecf20Sopenharmony_ci if (info.res < 0) { 448c2ecf20Sopenharmony_ci err = -info.err; 458c2ecf20Sopenharmony_ci printk(UM_KERN_ERR "get_pty : Couldn't grant pty - " 468c2ecf20Sopenharmony_ci "errno = %d\n", -info.err); 478c2ecf20Sopenharmony_ci goto out; 488c2ecf20Sopenharmony_ci } 498c2ecf20Sopenharmony_ci 508c2ecf20Sopenharmony_ci if (unlockpt(fd) < 0) { 518c2ecf20Sopenharmony_ci err = -errno; 528c2ecf20Sopenharmony_ci printk(UM_KERN_ERR "get_pty : Couldn't unlock pty - " 538c2ecf20Sopenharmony_ci "errno = %d\n", errno); 548c2ecf20Sopenharmony_ci goto out; 558c2ecf20Sopenharmony_ci } 568c2ecf20Sopenharmony_ci return fd; 578c2ecf20Sopenharmony_ciout: 588c2ecf20Sopenharmony_ci close(fd); 598c2ecf20Sopenharmony_ci return err; 608c2ecf20Sopenharmony_ci} 61