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From 8fb815ec846d9ac64c89ac21cededc17f0b804c3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Timo=20Ter=C3=A4s?= <timo.teras@iki.fi>
Date: Mon, 24 Sep 2012 07:58:29 +0300
Subject: [PATCH] fbsplash: support console switching
---
miscutils/fbsplash.c | 82 ++++++++++++++++++++++++++++++++++++++++----
1 file changed, 75 insertions(+), 7 deletions(-)
diff --git a/miscutils/fbsplash.c b/miscutils/fbsplash.c
index bc3c61055..1c206ef53 100644
--- a/miscutils/fbsplash.c
+++ b/miscutils/fbsplash.c
@@ -47,7 +47,7 @@
//kbuild:lib-$(CONFIG_FBSPLASH) += fbsplash.o
//usage:#define fbsplash_trivial_usage
-//usage: "-s IMGFILE [-c] [-d DEV] [-i INIFILE] [-f CMD]"
+//usage: "-s IMGFILE [-c] [-d DEV] [-i INIFILE] [-f CMD] [-T tty]"
//usage:#define fbsplash_full_usage "\n\n"
//usage: " -s Image"
//usage: "\n -c Hide cursor"
@@ -57,11 +57,17 @@
//usage: "\n BAR_R,BAR_G,BAR_B,IMG_LEFT,IMG_TOP"
//usage: "\n -f Control pipe (else exit after drawing image)"
//usage: "\n commands: 'NN' (% for progress bar) or 'exit'"
+//usage: "\n -T Switch to TTY to hide all console messages"
#include "libbb.h"
#include "common_bufsiz.h"
#include <linux/fb.h>
+#include <sys/vt.h>
+#include <sys/ioctl.h>
+#include <linux/tiocl.h>
+#include <linux/kd.h>
+
/* If you want logging messages on /tmp/fbsplash.log... */
#define DEBUG 0
@@ -75,6 +81,8 @@ struct globals {
unsigned char *addr; // pointer to framebuffer memory
unsigned ns[9]; // n-parameters
const char *image_filename;
+ int silent_tty, fd_tty_s;
+ bool do_not_draw;
struct fb_var_screeninfo scr_var;
struct fb_fix_screeninfo scr_fix;
unsigned bytes_per_pixel;
@@ -488,6 +496,11 @@ static void init(const char *cfg_filename)
config_close(parser);
}
+static void sighandler(int sig)
+{
+ ioctl(G.fd_tty_s, VT_RELDISP, sig == SIGUSR1 ? 1 : 2);
+ G.do_not_draw = (sig != SIGUSR2);
+}
int fbsplash_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int fbsplash_main(int argc UNUSED_PARAM, char **argv)
@@ -497,6 +510,9 @@ int fbsplash_main(int argc UNUSED_PARAM, char **argv)
char *num_buf;
unsigned num;
bool bCursorOff;
+ int fd_tty0, active_vt;
+ struct vt_stat vtstat;
+ struct vt_mode vt;
INIT_G();
@@ -504,8 +520,9 @@ int fbsplash_main(int argc UNUSED_PARAM, char **argv)
fb_device = "/dev/fb0";
cfg_filename = NULL;
fifo_filename = NULL;
- bCursorOff = 1 & getopt32(argv, "cs:d:i:f:",
- &G.image_filename, &fb_device, &cfg_filename, &fifo_filename);
+ bCursorOff = 1 & getopt32(argv, "cs:d:i:f:T:+",
+ &G.image_filename, &fb_device, &cfg_filename, &fifo_filename,
+ &G.silent_tty);
// parse configuration file
if (cfg_filename)
@@ -515,11 +532,43 @@ int fbsplash_main(int argc UNUSED_PARAM, char **argv)
if (!G.image_filename)
bb_show_usage();
+ fd_tty0 = get_console_fd_or_die();
+ if (G.silent_tty) {
+ char buf[16];
+
+ /* Initialize TTY */
+ bb_signals((1LL << SIGUSR1) | (1LL << SIGUSR2), sighandler);
+ snprintf(buf, sizeof(buf), "/dev/tty%d", G.silent_tty);
+ G.fd_tty_s = xopen(buf, O_RDWR | O_NOCTTY);
+
+ /* Activate TTY */
+ xioctl(fd_tty0, VT_GETSTATE, &vtstat);
+ active_vt = vtstat.v_active;
+ console_make_active(fd_tty0, G.silent_tty);
+
+ /* Get notifications on console changes */
+ vt.mode = VT_PROCESS;
+ vt.waitv = 0;
+ vt.relsig = SIGUSR1;
+ vt.acqsig = SIGUSR2;
+ ioctl(G.fd_tty_s, VT_SETMODE, &vt);
+
+ /* Redirect all kernel messages to tty1 so that they don't get
+ * printed over our silent splash image. And clear it. */
+ buf[0] = TIOCL_SETKMSGREDIRECT;
+ buf[1] = 1;
+ ioctl(G.fd_tty_s, TIOCLINUX, buf);
+ full_write(G.fd_tty_s, "\e[H\e[2J" "\e[?17;0c", 7+8);
+ ioctl(G.fd_tty_s, KDSETMODE, KD_GRAPHICS);
+ } else {
+ G.fd_tty_s = STDOUT_FILENO;
+ }
+
fb_open(fb_device);
if (fifo_filename && bCursorOff) {
// hide cursor (BEFORE any fb ops)
- full_write(STDOUT_FILENO, ESC"[?25l", 6);
+ full_write(G.fd_tty_s, ESC"[?25l", 6);
}
fb_drawimage();
@@ -527,6 +576,7 @@ int fbsplash_main(int argc UNUSED_PARAM, char **argv)
if (!fifo_filename)
return EXIT_SUCCESS;
+ sig_block(SIGUSR1);
fp = xfopen_stdin(fifo_filename);
if (fp != stdin) {
// For named pipes, we want to support this:
@@ -542,8 +592,9 @@ int fbsplash_main(int argc UNUSED_PARAM, char **argv)
// and become an additional writer :)
open(fifo_filename, O_WRONLY); // errors are ignored
}
-
fb_drawprogressbar(0);
+ sig_unblock(SIGUSR1);
+
// Block on read, waiting for some input.
// Use of <stdio.h> style I/O allows to correctly
// handle a case when we have many buffered lines
@@ -558,12 +609,29 @@ int fbsplash_main(int argc UNUSED_PARAM, char **argv)
#if DEBUG
DEBUG_MESSAGE(itoa(num));
#endif
- fb_drawprogressbar(num);
+ sig_block(SIGUSR1);
+ if (!G.do_not_draw)
+ fb_drawprogressbar(num);
+ sig_unblock(SIGUSR1);
}
free(num_buf);
}
- if (bCursorOff) // restore cursor
+ if (G.silent_tty) {
+ usleep(100*1000);
+
+ ioctl(G.fd_tty_s, VT_RELDISP, 1);
+ ioctl(G.fd_tty_s, KDSETMODE, KD_TEXT);
+ vt.mode = VT_AUTO;
+ vt.waitv = 0;
+ ioctl(G.fd_tty_s, VT_SETMODE, &vt);
+ close(G.fd_tty_s);
+
+ xioctl(fd_tty0, VT_GETSTATE, &vtstat);
+ if (vtstat.v_active == G.silent_tty)
+ console_make_active(fd_tty0, active_vt);
+ ioctl(fd_tty0, VT_DISALLOCATE, (void *)(ptrdiff_t)G.silent_tty);
+ } else if (bCursorOff) // restore cursor
full_write(STDOUT_FILENO, ESC"[?25h", 6);
return EXIT_SUCCESS;
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