mirror of
https://github.com/VincentWei/MiniGUI.git
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operators for Linux TTY
This commit is contained in:
Vincent Wei
266
src/ial/linux-tty.c
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266
src/ial/linux-tty.c
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/*
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* This file is part of MiniGUI, a mature cross-platform windowing
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* and Graphics User Interface (GUI) support system for embedded systems
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* and smart IoT devices.
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*
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* Copyright (C) 2002~2019, Beijing FMSoft Technologies Co., Ltd.
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* Copyright (C) 1998~2002, WEI Yongming
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* Or,
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*
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* As this program is a library, any link to this program must follow
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* GNU General Public License version 3 (GPLv3). If you cannot accept
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* GPLv3, you need to be licensed from FMSoft.
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*
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* If you have got a commercial license of this program, please use it
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* under the terms and conditions of the commercial license.
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*
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* For more information about the commercial license, please refer to
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* <http://www.minigui.com/en/about/licensing-policy/>.
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*/
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/*
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** linux-tty.c: handle linux tty device, e.g., VT switching.
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**
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** Derived from native/vt-switch.c by WEI Yongming at 2019-06-14
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*/
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#include <stdio.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include "common.h"
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#include "minigui.h"
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#ifdef __LINUX__
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#include <unistd.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <sys/ioctl.h>
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#include <sys/time.h>
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#include <linux/vt.h>
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#include <linux/kd.h>
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#include <linux/keyboard.h>
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#include "gdi.h"
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#include "window.h"
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#include "cliprect.h"
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#include "gal.h"
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#include "internals.h"
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#include "ctrlclass.h"
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#include "dc.h"
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#include "ial.h"
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#include "linux-tty.h"
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#define SIGRELVT SIGUSR1
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#define SIGACQVT SIGUSR2
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static int ttyfd = -1;
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static int vtswitch_initialized = 0;
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static int old_kd_mode = -1;
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static struct vt_mode saved_vtmode;
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static int current_vt;
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static volatile int console_active = 1; /* are we active? */
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static volatile int console_should_be_active = 1; /* should we be? */
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/* vt_switch_requested:
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* This is our signal handler; it gets called whenever a switch is
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* requested, because either SIGRELVT or SIGACQVT is raised.
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*/
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static void vt_switch_requested(int signo)
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{
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switch (signo) {
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case SIGRELVT:
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console_should_be_active = 0;
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break;
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case SIGACQVT:
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console_should_be_active = 1;
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break;
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default:
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return;
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}
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/* Checks whether a switch is needed and not blocked */
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if (console_active == console_should_be_active)
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return;
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if (console_should_be_active) {
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/* Performs a switch back. */
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int new_fd;
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IAL_ResumeMouse();
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if ((new_fd = IAL_ResumeKeyboard()) >= 0)
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ttyfd = new_fd;
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ioctl (ttyfd, VT_RELDISP, VT_ACKACQ);
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console_active = 1;
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#ifndef _MGRM_THREADS
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__mg_switch_away = FALSE;
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#endif
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#ifdef _MGRM_PROCESSES
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UpdateTopmostLayer (NULL);
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#else
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SendNotifyMessage (HWND_DESKTOP, MSG_PAINT, 0, 0);
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#endif
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}
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else {
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/* Performs a switch away. */
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#ifdef _MGRM_PROCESSES
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DisableClientsOutput ();
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#endif
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if (ioctl (ttyfd, VT_RELDISP, 1) == -1) {
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fprintf (stderr, "Error can't switch away from VT: %m\n");
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return;
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}
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console_active = 0;
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#ifndef _MGRM_THREADS
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__mg_switch_away = TRUE;
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#endif
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IAL_SuspendKeyboard();
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IAL_SuspendMouse();
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}
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}
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/* Init linux tty module, and returns the tty fd */
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int mg_linux_tty_init(BOOL graf_mode, BOOL vt_switch)
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{
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const char* tty_dev;
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if (geteuid() == 0)
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tty_dev = "/dev/tty0";
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else /* not a super user, so try to open the control terminal */
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tty_dev = "/dev/tty";
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/* open tty */
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ttyfd = open (tty_dev, O_RDWR);
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if (ttyfd < 0) {
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_ERR_PRINTF("Linux>TTY: Cannot open %s: %m\n", tty_dev);
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goto fail;
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}
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if (graf_mode) {
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if (ioctl (ttyfd, KDGETMODE, &old_kd_mode) == -1) {
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_ERR_PRINTF("Linux>TTY: Cannot get kd mode: %m\n");
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goto fail;
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}
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/* enter graphics mode */
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if (ioctl (ttyfd, KDSETMODE, KD_GRAPHICS) == -1) {
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_WRN_PRINTF("Failed when setting the terminal to graphics mode: %m.");
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_WRN_PRINTF("It might is not a console.");
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}
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}
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if (vt_switch) {
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struct sigaction sa;
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struct vt_mode vtm;
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struct vt_stat stat;
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if (ioctl (ttyfd, VT_GETSTATE, &stat) == -1) {
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_ERR_PRINTF("Linux>TTY: failed to get vt state: %m.\n");
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goto fail;
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}
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current_vt = stat.v_active;
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console_active = console_should_be_active = 1;
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/* Hook the signals */
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sigemptyset(&sa.sa_mask);
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sigaddset(&sa.sa_mask, SIGIO); /* block async IO during the VT switch */
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sa.sa_flags = 0;
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sa.sa_handler = vt_switch_requested;
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if ((sigaction(SIGRELVT, &sa, NULL) < 0) || (sigaction(SIGACQVT, &sa, NULL) < 0)) {
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_ERR_PRINTF("Linux>TTY: Unable to control VT switch.\n");
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goto fail;
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}
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/* Save old mode, take control, and arrange for the signals
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* to be raised. */
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if (ioctl(ttyfd, VT_GETMODE, &saved_vtmode) == -1) {
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_ERR_PRINTF("Linux>TTY: failed to get vt mode: %m.\n");
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goto fail;
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}
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vtm = saved_vtmode;
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vtm.mode = VT_PROCESS;
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vtm.relsig = SIGRELVT;
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vtm.acqsig = SIGACQVT;
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if (ioctl(ttyfd, VT_SETMODE, &vtm) == -1) {
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_ERR_PRINTF("Linux>TTY: failed to set vt mode: %m.\n");
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goto fail;
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}
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vtswitch_initialized = 1;
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}
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return ttyfd;
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fail:
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if (ttyfd >= 0) {
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close(ttyfd);
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ttyfd = -1;
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}
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return -1;
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}
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int mg_linux_tty_fini(void)
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{
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if (ttyfd < 0)
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return -1;
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if (vtswitch_initialized) {
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struct sigaction sa;
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/* Must turn off the signals before unhooking them... */
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ioctl (ttyfd, VT_SETMODE, &saved_vtmode);
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sigemptyset (&sa.sa_mask);
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sa.sa_handler = SIG_DFL;
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sa.sa_flags = SA_RESTART;
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sigaction (SIGRELVT, &sa, NULL);
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sigaction (SIGACQVT, &sa, NULL);
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vtswitch_initialized = 0;
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}
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if (old_kd_mode >= 0) {
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ioctl (ttyfd, KDSETMODE, old_kd_mode);
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}
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close (ttyfd);
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ttyfd = -1;
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return 0;
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}
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int mg_linux_tty_switch_vt(int vt)
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{
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if (ttyfd < 0 || !vtswitch_initialized || vt == current_vt)
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return 1;
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ioctl (ttyfd, VT_ACTIVATE, vt);
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return 0;
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}
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#endif /* __LINUX__ */
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