709f6e46a3
Our functions return negative error codes. Do not rely on errno being set after calling our own functions.
328 lines
10 KiB
C
328 lines
10 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2010 Kay Sievers
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <errno.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <linux/kd.h>
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#include <linux/tiocl.h>
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#include <linux/vt.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/ioctl.h>
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#include <unistd.h>
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#include "alloc-util.h"
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#include "fd-util.h"
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#include "fileio.h"
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#include "io-util.h"
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#include "locale-util.h"
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#include "log.h"
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#include "process-util.h"
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#include "signal-util.h"
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#include "string-util.h"
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#include "terminal-util.h"
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#include "util.h"
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#include "virt.h"
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static bool is_vconsole(int fd) {
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unsigned char data[1];
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data[0] = TIOCL_GETFGCONSOLE;
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return ioctl(fd, TIOCLINUX, data) >= 0;
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}
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static int disable_utf8(int fd) {
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int r = 0, k;
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if (ioctl(fd, KDSKBMODE, K_XLATE) < 0)
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r = -errno;
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k = loop_write(fd, "\033%@", 3, false);
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if (k < 0)
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r = k;
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k = write_string_file("/sys/module/vt/parameters/default_utf8", "0", 0);
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if (k < 0)
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r = k;
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if (r < 0)
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log_warning_errno(r, "Failed to disable UTF-8: %m");
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return r;
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}
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static int enable_utf8(int fd) {
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int r = 0, k;
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long current = 0;
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if (ioctl(fd, KDGKBMODE, ¤t) < 0 || current == K_XLATE) {
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/*
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* Change the current keyboard to unicode, unless it
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* is currently in raw or off mode anyway. We
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* shouldn't interfere with X11's processing of the
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* key events.
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*
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* http://lists.freedesktop.org/archives/systemd-devel/2013-February/008573.html
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*
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*/
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if (ioctl(fd, KDSKBMODE, K_UNICODE) < 0)
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r = -errno;
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}
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k = loop_write(fd, "\033%G", 3, false);
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if (k < 0)
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r = k;
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k = write_string_file("/sys/module/vt/parameters/default_utf8", "1", 0);
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if (k < 0)
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r = k;
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if (r < 0)
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log_warning_errno(r, "Failed to enable UTF-8: %m");
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return r;
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}
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static int keyboard_load_and_wait(const char *vc, const char *map, const char *map_toggle, bool utf8) {
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const char *args[8];
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int i = 0, r;
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pid_t pid;
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/* An empty map means kernel map */
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if (isempty(map))
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return 1;
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args[i++] = KBD_LOADKEYS;
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args[i++] = "-q";
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args[i++] = "-C";
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args[i++] = vc;
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if (utf8)
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args[i++] = "-u";
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args[i++] = map;
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if (map_toggle)
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args[i++] = map_toggle;
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args[i++] = NULL;
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pid = fork();
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if (pid < 0)
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return log_error_errno(errno, "Failed to fork: %m");
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else if (pid == 0) {
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(void) reset_all_signal_handlers();
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(void) reset_signal_mask();
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execv(args[0], (char **) args);
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_exit(EXIT_FAILURE);
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}
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r = wait_for_terminate_and_warn(KBD_LOADKEYS, pid, true);
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if (r < 0)
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return r;
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return r == 0;
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}
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static int font_load_and_wait(const char *vc, const char *font, const char *map, const char *unimap) {
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const char *args[9];
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int i = 0, r;
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pid_t pid;
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/* An empty font means kernel font */
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if (isempty(font))
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return 1;
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args[i++] = KBD_SETFONT;
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args[i++] = "-C";
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args[i++] = vc;
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args[i++] = font;
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if (map) {
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args[i++] = "-m";
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args[i++] = map;
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}
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if (unimap) {
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args[i++] = "-u";
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args[i++] = unimap;
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}
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args[i++] = NULL;
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pid = fork();
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if (pid < 0)
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return log_error_errno(errno, "Failed to fork: %m");
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else if (pid == 0) {
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(void) reset_all_signal_handlers();
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(void) reset_signal_mask();
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execv(args[0], (char **) args);
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_exit(EXIT_FAILURE);
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}
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r = wait_for_terminate_and_warn(KBD_SETFONT, pid, true);
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if (r < 0)
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return r;
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return r == 0;
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}
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/*
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* A newly allocated VT uses the font from the active VT. Here
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* we update all possibly already allocated VTs with the configured
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* font. It also allows to restart systemd-vconsole-setup.service,
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* to apply a new font to all VTs.
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*/
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static void font_copy_to_all_vcs(int fd) {
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struct vt_stat vcs = {};
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unsigned char map8[E_TABSZ];
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unsigned short map16[E_TABSZ];
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struct unimapdesc unimapd;
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struct unipair unipairs[USHRT_MAX];
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int i, r;
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/* get active, and 16 bit mask of used VT numbers */
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r = ioctl(fd, VT_GETSTATE, &vcs);
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if (r < 0) {
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log_debug_errno(errno, "VT_GETSTATE failed, ignoring: %m");
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return;
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}
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for (i = 1; i <= 15; i++) {
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char vcname[strlen("/dev/vcs") + DECIMAL_STR_MAX(int)];
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_cleanup_close_ int vcfd = -1;
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struct console_font_op cfo = {};
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if (i == vcs.v_active)
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continue;
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/* skip non-allocated ttys */
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snprintf(vcname, sizeof(vcname), "/dev/vcs%i", i);
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if (access(vcname, F_OK) < 0)
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continue;
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snprintf(vcname, sizeof(vcname), "/dev/tty%i", i);
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vcfd = open_terminal(vcname, O_RDWR|O_CLOEXEC);
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if (vcfd < 0)
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continue;
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/* copy font from active VT, where the font was uploaded to */
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cfo.op = KD_FONT_OP_COPY;
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cfo.height = vcs.v_active-1; /* tty1 == index 0 */
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(void) ioctl(vcfd, KDFONTOP, &cfo);
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/* copy map of 8bit chars */
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if (ioctl(fd, GIO_SCRNMAP, map8) >= 0)
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(void) ioctl(vcfd, PIO_SCRNMAP, map8);
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/* copy map of 8bit chars -> 16bit Unicode values */
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if (ioctl(fd, GIO_UNISCRNMAP, map16) >= 0)
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(void) ioctl(vcfd, PIO_UNISCRNMAP, map16);
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/* copy unicode translation table */
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/* unimapd is a ushort count and a pointer to an
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array of struct unipair { ushort, ushort } */
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unimapd.entries = unipairs;
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unimapd.entry_ct = USHRT_MAX;
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if (ioctl(fd, GIO_UNIMAP, &unimapd) >= 0) {
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struct unimapinit adv = { 0, 0, 0 };
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(void) ioctl(vcfd, PIO_UNIMAPCLR, &adv);
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(void) ioctl(vcfd, PIO_UNIMAP, &unimapd);
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}
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}
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}
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int main(int argc, char **argv) {
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const char *vc;
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_cleanup_free_ char
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*vc_keymap = NULL, *vc_keymap_toggle = NULL,
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*vc_font = NULL, *vc_font_map = NULL, *vc_font_unimap = NULL;
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_cleanup_close_ int fd = -1;
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bool utf8, font_copy = false, font_ok, keyboard_ok;
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int r = EXIT_FAILURE;
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log_set_target(LOG_TARGET_AUTO);
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log_parse_environment();
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log_open();
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umask(0022);
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if (argv[1])
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vc = argv[1];
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else {
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vc = "/dev/tty0";
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font_copy = true;
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}
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fd = open_terminal(vc, O_RDWR|O_CLOEXEC);
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if (fd < 0) {
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log_error_errno(fd, "Failed to open %s: %m", vc);
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return EXIT_FAILURE;
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}
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if (!is_vconsole(fd)) {
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log_error("Device %s is not a virtual console.", vc);
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return EXIT_FAILURE;
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}
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utf8 = is_locale_utf8();
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r = parse_env_file("/etc/vconsole.conf", NEWLINE,
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"KEYMAP", &vc_keymap,
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"KEYMAP_TOGGLE", &vc_keymap_toggle,
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"FONT", &vc_font,
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"FONT_MAP", &vc_font_map,
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"FONT_UNIMAP", &vc_font_unimap,
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NULL);
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if (r < 0 && r != -ENOENT)
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log_warning_errno(r, "Failed to read /etc/vconsole.conf: %m");
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/* Let the kernel command line override /etc/vconsole.conf */
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if (detect_container() <= 0) {
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r = parse_env_file("/proc/cmdline", WHITESPACE,
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"vconsole.keymap", &vc_keymap,
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"vconsole.keymap.toggle", &vc_keymap_toggle,
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"vconsole.font", &vc_font,
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"vconsole.font.map", &vc_font_map,
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"vconsole.font.unimap", &vc_font_unimap,
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NULL);
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if (r < 0 && r != -ENOENT)
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log_warning_errno(r, "Failed to read /proc/cmdline: %m");
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}
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if (utf8)
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(void) enable_utf8(fd);
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else
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(void) disable_utf8(fd);
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font_ok = font_load_and_wait(vc, vc_font, vc_font_map, vc_font_unimap) > 0;
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keyboard_ok = keyboard_load_and_wait(vc, vc_keymap, vc_keymap_toggle, utf8) > 0;
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/* Only copy the font when we executed setfont successfully */
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if (font_copy && font_ok)
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(void) font_copy_to_all_vcs(fd);
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return font_ok && keyboard_ok ? EXIT_SUCCESS : EXIT_FAILURE;
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}
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