nativelibc/posix-io/tty-fd.c

/*	A part of the Native C Library for Windows NT
	Copyright 2007-2015 PC GO Ld.

	This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

	This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
*/

#include <unistd.h>
#include <errno.h>
#include <windows.h>
#include <nt.h>

#include <stdio.h>

static void *keyboard_fh;
static int stdin_fd = TTY_FD_DEFAULT;
static int stdout_fd = TTY_FD_DEFAULT;
static int stderr_fd = TTY_FD_DEFAULT;

int __init_keyboard() {
	UNICODE_STRING keyboard_path = { .Buffer = L"\\Device\\KeyboardClass0" };
	keyboard_path.MaximumLength = sizeof L"\\Device\\KeyboardClass0";
	keyboard_path.Length = keyboard_path.MaximumLength - sizeof(wchar_t);
	OBJECT_ATTRIBUTES object_attrib = { sizeof(OBJECT_ATTRIBUTES), NULL, &keyboard_path, 0, NULL, NULL };
	unsigned long int access_mask = GENERIC_READ | SYNCHRONIZE;
	IO_STATUS_BLOCK io_status;
	long int status = NtOpenFile(&keyboard_fh, access_mask, &object_attrib, &io_status, 0, FILE_DIRECTORY_FILE);
	printf("nativelibc debug: __init_keyboard: status = 0x%lx\n", status);
	if(status < 0) {
		__set_errno_from_ntstatus(status);
		return -1;
	}
	return 0;
}

int _get_stdin_fd(void **keyboard) {
	if(keyboard && stdin_fd == TTY_FD_DEFAULT) *keyboard = keyboard_fh;
	return stdin_fd;
}

int _get_stdout_fd() {
	return stdout_fd;
}

int _get_stderr_fd() {
	return stderr_fd;
}

int _set_stdin_fd(int fd) {
	if(fd == 0 || fd == 1 || fd == 2) {
		errno = EBADF;
		return -1;
	}
	stdin_fd = fd;
	return 0;
}

int _set_stdout_fd(int fd) {
	if(fd == 0 || fd == 1 || fd == 2) {
		errno = EBADF;
		return -1;
	}
	stdout_fd = fd;
	return 0;
}

int _set_stderr_fd(int fd) {
	if(fd == 0 || fd == 1 || fd == 2) {
		errno = EBADF;
		return -1;
	}
	stderr_fd = fd;
	return 0;
}

int _get_std_fd(int pseudo_fd) {
	switch(pseudo_fd) {
		case STDIN_FILENO:
			return stdin_fd;
		case STDOUT_FILENO:
			return stdout_fd;
		case STDERR_FILENO:
			return stderr_fd;
		default:
			errno = EINVAL;
			return -1;
	}
}

int _set_std_fd(int pseudo_fd, int real_fd) {
	if(real_fd == STDIN_FILENO || real_fd == STDOUT_FILENO || real_fd == STDERR_FILENO) {
		errno = EBADF;
		return -1;
	}
	switch(pseudo_fd) {
		case STDIN_FILENO:
			stdin_fd = real_fd;
			break;
		case STDOUT_FILENO:
			stdout_fd = real_fd;
			break;
		case STDERR_FILENO:
			stderr_fd = real_fd;
			break;
		default:
			errno = EINVAL;
			return -1;
	}
	return 0;
}