61 строка
1.0 KiB
C
61 строка
1.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
|
|
*/
|
|
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <kern_util.h>
|
|
#include <os.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;
|
|
}
|