/* | |
* Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) | |
* Licensed under the GPL | |
*/ | |
#include <stdlib.h> | |
#include <unistd.h> | |
#include <errno.h> | |
#include <fcntl.h> | |
#include "kern_constants.h" | |
#include "kern_util.h" | |
#include "os.h" | |
#include "user.h" | |
struct grantpt_info { | |
int fd; | |
int res; | |
int err; | |
}; | |
static void grantpt_cb(void *arg) | |
{ | |
struct grantpt_info *info = arg; | |
info->res = grantpt(info->fd); | |
info->err = errno; | |
} | |
int get_pty(void) | |
{ | |
struct grantpt_info info; | |
int fd, err; | |
fd = open("/dev/ptmx", O_RDWR); | |
if (fd < 0) { | |
err = -errno; | |
printk(UM_KERN_ERR "get_pty : Couldn't open /dev/ptmx - " | |
"err = %d\n", errno); | |
return err; | |
} | |
info.fd = fd; | |
initial_thread_cb(grantpt_cb, &info); | |
if (info.res < 0) { | |
err = -info.err; | |
printk(UM_KERN_ERR "get_pty : Couldn't grant pty - " | |
"errno = %d\n", -info.err); | |
goto out; | |
} | |
if (unlockpt(fd) < 0) { | |
err = -errno; | |
printk(UM_KERN_ERR "get_pty : Couldn't unlock pty - " | |
"errno = %d\n", errno); | |
goto out; | |
} | |
return fd; | |
out: | |
close(fd); | |
return err; | |
} |