[2725] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * A text-mode VNC like program for Linux virtual terminals.
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| 4 | *
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| 5 | * pascal.bellard@ads-lu.com
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| 6 | *
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| 7 | * Based on Russell Stuart's conspy.c
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| 8 | * http://ace-host.stuart.id.au/russell/files/conspy.c
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| 9 | *
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| 10 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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| 11 | */
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| 12 |
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[3232] | 13 | //applet:IF_CONSPY(APPLET(conspy, BB_DIR_BIN, BB_SUID_DROP))
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[2725] | 14 |
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| 15 | //kbuild:lib-$(CONFIG_CONSPY) += conspy.o
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| 16 |
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| 17 | //config:config CONSPY
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| 18 | //config: bool "conspy"
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[3232] | 19 | //config: default y
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| 20 | //config: select PLATFORM_LINUX
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[2725] | 21 | //config: help
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| 22 | //config: A text-mode VNC like program for Linux virtual terminals.
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| 23 | //config: example: conspy NUM shared access to console num
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| 24 | //config: or conspy -nd NUM screenshot of console num
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| 25 | //config: or conspy -cs NUM poor man's GNU screen like
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| 26 |
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| 27 | //usage:#define conspy_trivial_usage
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[3232] | 28 | //usage: "[-vcsndfFQ] [-x COL] [-y LINE] [CONSOLE_NO]"
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[2725] | 29 | //usage:#define conspy_full_usage "\n\n"
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| 30 | //usage: "A text-mode VNC like program for Linux virtual consoles."
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| 31 | //usage: "\nTo exit, quickly press ESC 3 times."
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| 32 | //usage: "\n"
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| 33 | //usage: "\n -v Don't send keystrokes to the console"
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[3232] | 34 | //usage: "\n -c Create missing /dev/{tty,vcsa}N"
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[2725] | 35 | //usage: "\n -s Open a SHELL session"
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| 36 | //usage: "\n -n Black & white"
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| 37 | //usage: "\n -d Dump console to stdout"
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| 38 | //usage: "\n -f Follow cursor"
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[3232] | 39 | //usage: "\n -F Assume console is on a framebuffer device"
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| 40 | //usage: "\n -Q Disable exit on ESC-ESC-ESC"
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[2725] | 41 | //usage: "\n -x COL Starting column"
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| 42 | //usage: "\n -y LINE Starting line"
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| 43 |
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| 44 | #include "libbb.h"
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| 45 | #include <sys/kd.h>
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| 46 |
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| 47 | #define ESC "\033"
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[3232] | 48 | #define CURSOR_ON -1
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| 49 | #define CURSOR_OFF 1
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[2725] | 50 |
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[3232] | 51 | #define DEV_TTY "/dev/tty"
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| 52 | #define DEV_VCSA "/dev/vcsa"
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| 53 |
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[2725] | 54 | struct screen_info {
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| 55 | unsigned char lines, cols, cursor_x, cursor_y;
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| 56 | };
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| 57 |
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| 58 | #define CHAR(x) (*(uint8_t*)(x))
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| 59 | #define ATTR(x) (((uint8_t*)(x))[1])
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| 60 | #define NEXT(x) ((x) += 2)
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| 61 | #define DATA(x) (*(uint16_t*)(x))
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| 62 |
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| 63 | struct globals {
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| 64 | char* data;
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| 65 | int size;
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| 66 | int x, y;
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| 67 | int kbd_fd;
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| 68 | int ioerror_count;
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| 69 | int key_count;
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| 70 | int escape_count;
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| 71 | int nokeys;
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| 72 | int current;
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| 73 | int first_line_offset;
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| 74 | int last_attr;
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| 75 | // cached local tty parameters
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| 76 | unsigned width;
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| 77 | unsigned height;
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| 78 | unsigned col;
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| 79 | unsigned line;
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| 80 | smallint curoff; // unknown:0 cursor on:-1 cursor off:1
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[3232] | 81 | char attrbuf[sizeof("0;1;5;30;40m")];
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[2725] | 82 | // remote console
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| 83 | struct screen_info remote;
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| 84 | // saved local tty terminfo
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| 85 | struct termios term_orig;
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[3232] | 86 | char vcsa_name[sizeof(DEV_VCSA "NN")];
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[2725] | 87 | };
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| 88 |
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| 89 | #define G (*ptr_to_globals)
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| 90 | #define INIT_G() do { \
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| 91 | SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
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| 92 | G.width = G.height = UINT_MAX; \
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| 93 | G.last_attr--; \
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| 94 | } while (0)
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| 95 |
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| 96 | enum {
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| 97 | FLAG_v, // view only
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| 98 | FLAG_c, // create device if need
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[3232] | 99 | FLAG_Q, // never exit
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[2725] | 100 | FLAG_s, // session
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| 101 | FLAG_n, // no colors
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| 102 | FLAG_d, // dump screen
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| 103 | FLAG_f, // follow cursor
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[3232] | 104 | FLAG_F, // framebuffer
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[2725] | 105 | };
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| 106 | #define FLAG(x) (1 << FLAG_##x)
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| 107 | #define BW (option_mask32 & FLAG(n))
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| 108 |
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[3232] | 109 | static void putcsi(const char *s)
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| 110 | {
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| 111 | fputs(ESC"[", stdout);
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| 112 | fputs(s, stdout);
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| 113 | }
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| 114 |
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[2725] | 115 | static void clrscr(void)
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| 116 | {
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| 117 | // Home, clear till end of screen
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[3232] | 118 | putcsi("1;1H" ESC"[J");
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[2725] | 119 | G.col = G.line = 0;
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| 120 | }
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| 121 |
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| 122 | static void set_cursor(int state)
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| 123 | {
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| 124 | if (G.curoff != state) {
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| 125 | G.curoff = state;
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[3232] | 126 | putcsi("?25");
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[2725] | 127 | bb_putchar("h?l"[1 + state]);
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| 128 | }
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| 129 | }
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| 130 |
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| 131 | static void gotoxy(int col, int line)
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| 132 | {
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| 133 | if (G.col != col || G.line != line) {
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| 134 | G.col = col;
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| 135 | G.line = line;
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| 136 | printf(ESC"[%u;%uH", line + 1, col + 1);
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| 137 | }
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| 138 | }
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| 139 |
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[3232] | 140 | static void cleanup(int code) NORETURN;
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[2725] | 141 | static void cleanup(int code)
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| 142 | {
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[3232] | 143 | set_cursor(CURSOR_ON);
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[2725] | 144 | tcsetattr(G.kbd_fd, TCSANOW, &G.term_orig);
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| 145 | if (ENABLE_FEATURE_CLEAN_UP) {
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| 146 | close(G.kbd_fd);
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| 147 | }
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| 148 | // Reset attributes
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| 149 | if (!BW)
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[3232] | 150 | putcsi("0m");
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[2725] | 151 | bb_putchar('\n');
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[3232] | 152 | if (code > EXIT_FAILURE)
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[2725] | 153 | kill_myself_with_sig(code);
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| 154 | exit(code);
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| 155 | }
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| 156 |
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| 157 | static void screen_read_close(void)
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| 158 | {
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| 159 | unsigned i, j;
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| 160 | int vcsa_fd;
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| 161 | char *data;
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| 162 |
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| 163 | // Close & re-open vcsa in case they have swapped virtual consoles
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| 164 | vcsa_fd = xopen(G.vcsa_name, O_RDONLY);
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| 165 | xread(vcsa_fd, &G.remote, 4);
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| 166 | i = G.remote.cols * 2;
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| 167 | G.first_line_offset = G.y * i;
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| 168 | i *= G.remote.lines;
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| 169 | if (G.data == NULL) {
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| 170 | G.size = i;
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| 171 | G.data = xzalloc(2 * i);
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| 172 | }
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[3232] | 173 | if (G.size != i) {
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| 174 | cleanup(EXIT_FAILURE);
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[2725] | 175 | }
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| 176 | data = G.data + G.current;
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| 177 | xread(vcsa_fd, data, G.size);
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| 178 | close(vcsa_fd);
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| 179 | for (i = 0; i < G.remote.lines; i++) {
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| 180 | for (j = 0; j < G.remote.cols; j++, NEXT(data)) {
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| 181 | unsigned x = j - G.x; // if will catch j < G.x too
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| 182 | unsigned y = i - G.y; // if will catch i < G.y too
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| 183 |
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| 184 | if (y >= G.height || x >= G.width)
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| 185 | DATA(data) = 0;
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[3232] | 186 | else {
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| 187 | uint8_t ch = CHAR(data);
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| 188 | if (ch < ' ')
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| 189 | CHAR(data) = ch | 0x40;
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| 190 | else if (ch > 0x7e)
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| 191 | CHAR(data) = '?';
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| 192 | }
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[2725] | 193 | }
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| 194 | }
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| 195 | }
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| 196 |
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| 197 | static void screen_char(char *data)
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| 198 | {
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| 199 | if (!BW) {
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[3232] | 200 | uint8_t attr_diff;
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[2725] | 201 | uint8_t attr = ATTR(data);
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| 202 |
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[3232] | 203 | if (option_mask32 & FLAG(F)) {
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| 204 | attr >>= 1;
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| 205 | }
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| 206 | attr_diff = G.last_attr ^ attr;
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[2725] | 207 | if (attr_diff) {
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| 208 | // Attribute layout for VGA compatible text videobuffer:
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| 209 | // blinking text
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| 210 | // |red bkgd
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| 211 | // ||green bkgd
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| 212 | // |||blue bkgd
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| 213 | // vvvv
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| 214 | // 00000000 <- lsb bit on the right
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| 215 | // bold text / text 8th bit
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| 216 | // red text
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| 217 | // green text
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| 218 | // blue text
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| 219 | // TODO: apparently framebuffer-based console uses different layout
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| 220 | // (bug? attempt to get 8th text bit in better position?)
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| 221 | // red bkgd
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| 222 | // |green bkgd
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| 223 | // ||blue bkgd
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| 224 | // vvv
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| 225 | // 00000000 <- lsb bit on the right
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| 226 | // bold text
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| 227 | // red text
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| 228 | // green text
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| 229 | // blue text
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| 230 | // text 8th bit
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| 231 | // converting RGB color bit triad to BGR:
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| 232 | static const char color[8] = "04261537";
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| 233 | const uint8_t fg_mask = 0x07, bold_mask = 0x08;
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| 234 | const uint8_t bg_mask = 0x70, blink_mask = 0x80;
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| 235 | char *ptr;
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| 236 |
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[3232] | 237 | ptr = G.attrbuf;
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[2725] | 238 |
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| 239 | // (G.last_attr & ~attr) has 1 only where
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| 240 | // G.last_attr has 1 but attr has 0.
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| 241 | // Here we check whether we have transition
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| 242 | // bold->non-bold or blink->non-blink:
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| 243 | if (G.last_attr < 0 // initial value
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| 244 | || ((G.last_attr & ~attr) & (bold_mask | blink_mask)) != 0
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| 245 | ) {
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| 246 | *ptr++ = '0'; // "reset all attrs"
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| 247 | *ptr++ = ';';
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| 248 | // must set fg & bg, maybe need to set bold or blink:
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| 249 | attr_diff = attr | ~(bold_mask | blink_mask);
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| 250 | }
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| 251 | G.last_attr = attr;
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| 252 | if (attr_diff & bold_mask) {
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| 253 | *ptr++ = '1';
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| 254 | *ptr++ = ';';
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| 255 | }
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| 256 | if (attr_diff & blink_mask) {
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| 257 | *ptr++ = '5';
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| 258 | *ptr++ = ';';
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| 259 | }
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| 260 | if (attr_diff & fg_mask) {
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| 261 | *ptr++ = '3';
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| 262 | *ptr++ = color[attr & fg_mask];
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| 263 | *ptr++ = ';';
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| 264 | }
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| 265 | if (attr_diff & bg_mask) {
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| 266 | *ptr++ = '4';
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| 267 | *ptr++ = color[(attr & bg_mask) >> 4];
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[3232] | 268 | ptr++; // last attribute
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[2725] | 269 | }
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[3232] | 270 | if (ptr != G.attrbuf) {
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[2725] | 271 | ptr[-1] = 'm';
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| 272 | *ptr = '\0';
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[3232] | 273 | putcsi(G.attrbuf);
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[2725] | 274 | }
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| 275 | }
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| 276 | }
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| 277 | putchar(CHAR(data));
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| 278 | G.col++;
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| 279 | }
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| 280 |
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| 281 | static void screen_dump(void)
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| 282 | {
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| 283 | int linefeed_cnt;
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| 284 | int line, col;
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| 285 | int linecnt = G.remote.lines - G.y;
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| 286 | char *data = G.data + G.current + G.first_line_offset;
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| 287 |
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| 288 | linefeed_cnt = 0;
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| 289 | for (line = 0; line < linecnt && line < G.height; line++) {
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| 290 | int space_cnt = 0;
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| 291 | for (col = 0; col < G.remote.cols; col++, NEXT(data)) {
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| 292 | unsigned tty_col = col - G.x; // if will catch col < G.x too
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| 293 |
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| 294 | if (tty_col >= G.width)
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| 295 | continue;
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| 296 | space_cnt++;
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| 297 | if (BW && CHAR(data) == ' ')
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| 298 | continue;
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| 299 | while (linefeed_cnt != 0) {
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| 300 | //bb_putchar('\r'); - tty driver does it for us
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| 301 | bb_putchar('\n');
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| 302 | linefeed_cnt--;
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| 303 | }
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| 304 | while (--space_cnt)
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| 305 | bb_putchar(' ');
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| 306 | screen_char(data);
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| 307 | }
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| 308 | linefeed_cnt++;
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| 309 | }
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| 310 | }
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| 311 |
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| 312 | static void curmove(void)
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| 313 | {
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| 314 | unsigned cx = G.remote.cursor_x - G.x;
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| 315 | unsigned cy = G.remote.cursor_y - G.y;
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[3232] | 316 | int cursor = CURSOR_OFF;
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[2725] | 317 |
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| 318 | if (cx < G.width && cy < G.height) {
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| 319 | gotoxy(cx, cy);
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[3232] | 320 | cursor = CURSOR_ON;
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[2725] | 321 | }
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| 322 | set_cursor(cursor);
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| 323 | }
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| 324 |
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| 325 | static void create_cdev_if_doesnt_exist(const char* name, dev_t dev)
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| 326 | {
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| 327 | int fd = open(name, O_RDONLY);
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| 328 | if (fd != -1)
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| 329 | close(fd);
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| 330 | else if (errno == ENOENT)
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| 331 | mknod(name, S_IFCHR | 0660, dev);
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| 332 | }
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| 333 |
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| 334 | static NOINLINE void start_shell_in_child(const char* tty_name)
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| 335 | {
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| 336 | int pid = xvfork();
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| 337 | if (pid == 0) {
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| 338 | struct termios termchild;
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[3232] | 339 | const char *shell = get_shell_name();
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[2725] | 340 |
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| 341 | signal(SIGHUP, SIG_IGN);
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| 342 | // set tty as a controlling tty
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| 343 | setsid();
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| 344 | // make tty to be input, output, error
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| 345 | close(0);
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| 346 | xopen(tty_name, O_RDWR); // uses fd 0
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| 347 | xdup2(0, 1);
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| 348 | xdup2(0, 2);
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| 349 | ioctl(0, TIOCSCTTY, 1);
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| 350 | tcsetpgrp(0, getpid());
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| 351 | tcgetattr(0, &termchild);
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| 352 | termchild.c_lflag |= ECHO;
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| 353 | termchild.c_oflag |= ONLCR | XTABS;
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| 354 | termchild.c_iflag |= ICRNL;
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| 355 | termchild.c_iflag &= ~IXOFF;
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| 356 | tcsetattr_stdin_TCSANOW(&termchild);
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| 357 | execl(shell, shell, "-i", (char *) NULL);
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| 358 | bb_simple_perror_msg_and_die(shell);
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| 359 | }
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| 360 | }
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| 361 |
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| 362 | int conspy_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 363 | int conspy_main(int argc UNUSED_PARAM, char **argv)
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| 364 | {
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[3232] | 365 | char tty_name[sizeof(DEV_TTY "NN")];
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[2725] | 366 | #define keybuf bb_common_bufsiz1
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| 367 | struct termios termbuf;
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| 368 | unsigned opts;
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| 369 | unsigned ttynum;
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| 370 | int poll_timeout_ms;
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| 371 | #if ENABLE_LONG_OPTS
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| 372 | static const char getopt_longopts[] ALIGN1 =
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| 373 | "viewonly\0" No_argument "v"
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| 374 | "createdevice\0" No_argument "c"
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[3232] | 375 | "neverquit\0" No_argument "Q"
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[2725] | 376 | "session\0" No_argument "s"
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| 377 | "nocolors\0" No_argument "n"
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| 378 | "dump\0" No_argument "d"
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| 379 | "follow\0" No_argument "f"
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[3232] | 380 | "framebuffer\0" No_argument "F"
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[2725] | 381 | ;
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| 382 |
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| 383 | applet_long_options = getopt_longopts;
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| 384 | #endif
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| 385 | INIT_G();
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[3232] | 386 | strcpy(G.vcsa_name, DEV_VCSA);
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[2725] | 387 |
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| 388 | opt_complementary = "x+:y+"; // numeric params
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[3232] | 389 | opts = getopt32(argv, "vcQsndfFx:y:", &G.x, &G.y);
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[2725] | 390 | argv += optind;
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| 391 | ttynum = 0;
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| 392 | if (argv[0]) {
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| 393 | ttynum = xatou_range(argv[0], 0, 63);
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[3232] | 394 | sprintf(G.vcsa_name + sizeof(DEV_VCSA)-1, "%u", ttynum);
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[2725] | 395 | }
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[3232] | 396 | sprintf(tty_name, "%s%u", DEV_TTY, ttynum);
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[2725] | 397 | if (opts & FLAG(c)) {
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| 398 | if ((opts & (FLAG(s)|FLAG(v))) != FLAG(v))
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| 399 | create_cdev_if_doesnt_exist(tty_name, makedev(4, ttynum));
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| 400 | create_cdev_if_doesnt_exist(G.vcsa_name, makedev(7, 128 + ttynum));
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| 401 | }
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| 402 | if ((opts & FLAG(s)) && ttynum) {
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| 403 | start_shell_in_child(tty_name);
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| 404 | }
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| 405 |
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| 406 | screen_read_close();
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| 407 | if (opts & FLAG(d)) {
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| 408 | screen_dump();
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| 409 | bb_putchar('\n');
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| 410 | return 0;
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| 411 | }
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| 412 |
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| 413 | bb_signals(BB_FATAL_SIGS, cleanup);
|
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| 414 |
|
---|
| 415 | // All characters must be passed through to us unaltered
|
---|
| 416 | G.kbd_fd = xopen(CURRENT_TTY, O_RDONLY);
|
---|
| 417 | tcgetattr(G.kbd_fd, &G.term_orig);
|
---|
| 418 | termbuf = G.term_orig;
|
---|
| 419 | termbuf.c_iflag &= ~(BRKINT|INLCR|ICRNL|IXON|IXOFF|IUCLC|IXANY|IMAXBEL);
|
---|
| 420 | //termbuf.c_oflag &= ~(OPOST); - no, we still want \n -> \r\n
|
---|
| 421 | termbuf.c_lflag &= ~(ISIG|ICANON|ECHO);
|
---|
| 422 | termbuf.c_cc[VMIN] = 1;
|
---|
| 423 | termbuf.c_cc[VTIME] = 0;
|
---|
| 424 | tcsetattr(G.kbd_fd, TCSANOW, &termbuf);
|
---|
| 425 |
|
---|
| 426 | poll_timeout_ms = 250;
|
---|
| 427 | while (1) {
|
---|
| 428 | struct pollfd pfd;
|
---|
| 429 | int bytes_read;
|
---|
| 430 | int i, j;
|
---|
| 431 | char *data, *old;
|
---|
| 432 |
|
---|
| 433 | // in the first loop G.width = G.height = 0: refresh
|
---|
| 434 | i = G.width;
|
---|
| 435 | j = G.height;
|
---|
| 436 | get_terminal_width_height(G.kbd_fd, &G.width, &G.height);
|
---|
| 437 | if (option_mask32 & FLAG(f)) {
|
---|
| 438 | int nx = G.remote.cursor_x - G.width + 1;
|
---|
| 439 | int ny = G.remote.cursor_y - G.height + 1;
|
---|
| 440 |
|
---|
| 441 | if (G.remote.cursor_x < G.x) {
|
---|
| 442 | G.x = G.remote.cursor_x;
|
---|
| 443 | i = 0; // force refresh
|
---|
| 444 | }
|
---|
| 445 | if (nx > G.x) {
|
---|
| 446 | G.x = nx;
|
---|
| 447 | i = 0; // force refresh
|
---|
| 448 | }
|
---|
| 449 | if (G.remote.cursor_y < G.y) {
|
---|
| 450 | G.y = G.remote.cursor_y;
|
---|
| 451 | i = 0; // force refresh
|
---|
| 452 | }
|
---|
| 453 | if (ny > G.y) {
|
---|
| 454 | G.y = ny;
|
---|
| 455 | i = 0; // force refresh
|
---|
| 456 | }
|
---|
| 457 | }
|
---|
| 458 |
|
---|
| 459 | // Scan console data and redraw our tty where needed
|
---|
| 460 | old = G.data + G.current;
|
---|
| 461 | G.current = G.size - G.current;
|
---|
| 462 | data = G.data + G.current;
|
---|
| 463 | screen_read_close();
|
---|
| 464 | if (i != G.width || j != G.height) {
|
---|
| 465 | clrscr();
|
---|
| 466 | screen_dump();
|
---|
| 467 | } else {
|
---|
| 468 | // For each remote line
|
---|
| 469 | old += G.first_line_offset;
|
---|
| 470 | data += G.first_line_offset;
|
---|
| 471 | for (i = G.y; i < G.remote.lines; i++) {
|
---|
| 472 | char *first = NULL; // first char which needs updating
|
---|
| 473 | char *last = last; // last char which needs updating
|
---|
| 474 | unsigned iy = i - G.y;
|
---|
| 475 |
|
---|
| 476 | if (iy >= G.height)
|
---|
| 477 | break;
|
---|
| 478 | for (j = 0; j < G.remote.cols; j++, NEXT(old), NEXT(data)) {
|
---|
| 479 | unsigned jx = j - G.x; // if will catch j >= G.x too
|
---|
| 480 |
|
---|
| 481 | if (jx < G.width && DATA(data) != DATA(old)) {
|
---|
| 482 | last = data;
|
---|
| 483 | if (!first) {
|
---|
| 484 | first = data;
|
---|
| 485 | gotoxy(jx, iy);
|
---|
| 486 | }
|
---|
| 487 | }
|
---|
| 488 | }
|
---|
| 489 | if (first) {
|
---|
| 490 | // Rewrite updated data on the local screen
|
---|
| 491 | for (; first <= last; NEXT(first))
|
---|
| 492 | screen_char(first);
|
---|
| 493 | }
|
---|
| 494 | }
|
---|
| 495 | }
|
---|
| 496 | curmove();
|
---|
| 497 |
|
---|
| 498 | // Wait for local user keypresses
|
---|
| 499 | fflush_all();
|
---|
| 500 | pfd.fd = G.kbd_fd;
|
---|
| 501 | pfd.events = POLLIN;
|
---|
| 502 | bytes_read = 0;
|
---|
| 503 | switch (poll(&pfd, 1, poll_timeout_ms)) {
|
---|
| 504 | char *k;
|
---|
| 505 | case -1:
|
---|
| 506 | if (errno != EINTR)
|
---|
[3232] | 507 | goto abort;
|
---|
[2725] | 508 | break;
|
---|
| 509 | case 0:
|
---|
| 510 | if (++G.nokeys >= 4)
|
---|
| 511 | G.nokeys = G.escape_count = 0;
|
---|
| 512 | break;
|
---|
| 513 | default:
|
---|
| 514 | // Read the keys pressed
|
---|
| 515 | k = keybuf + G.key_count;
|
---|
| 516 | bytes_read = read(G.kbd_fd, k, sizeof(keybuf) - G.key_count);
|
---|
| 517 | if (bytes_read < 0)
|
---|
[3232] | 518 | goto abort;
|
---|
[2725] | 519 |
|
---|
| 520 | // Do exit processing
|
---|
[3232] | 521 | if (!(option_mask32 & FLAG(Q))) {
|
---|
| 522 | for (i = 0; i < bytes_read; i++) {
|
---|
| 523 | if (k[i] != '\033')
|
---|
| 524 | G.escape_count = -1;
|
---|
| 525 | if (++G.escape_count >= 3)
|
---|
| 526 | cleanup(EXIT_SUCCESS);
|
---|
| 527 | }
|
---|
[2725] | 528 | }
|
---|
| 529 | }
|
---|
| 530 | poll_timeout_ms = 250;
|
---|
[3232] | 531 | if (option_mask32 & FLAG(v)) continue;
|
---|
[2725] | 532 |
|
---|
| 533 | // Insert all keys pressed into the virtual console's input
|
---|
| 534 | // buffer. Don't do this if the virtual console is in scan
|
---|
| 535 | // code mode - giving ASCII characters to a program expecting
|
---|
| 536 | // scan codes will confuse it.
|
---|
[3232] | 537 | G.key_count += bytes_read;
|
---|
| 538 | if (G.escape_count == 0) {
|
---|
[2725] | 539 | int handle, result;
|
---|
| 540 | long kbd_mode;
|
---|
| 541 |
|
---|
| 542 | handle = xopen(tty_name, O_WRONLY);
|
---|
| 543 | result = ioctl(handle, KDGKBMODE, &kbd_mode);
|
---|
| 544 | if (result >= 0) {
|
---|
| 545 | char *p = keybuf;
|
---|
| 546 |
|
---|
[3232] | 547 | G.ioerror_count = 0;
|
---|
[2725] | 548 | if (kbd_mode != K_XLATE && kbd_mode != K_UNICODE) {
|
---|
| 549 | G.key_count = 0; // scan code mode
|
---|
| 550 | }
|
---|
| 551 | for (; G.key_count != 0; p++, G.key_count--) {
|
---|
| 552 | result = ioctl(handle, TIOCSTI, p);
|
---|
| 553 | if (result < 0) {
|
---|
| 554 | memmove(keybuf, p, G.key_count);
|
---|
| 555 | break;
|
---|
| 556 | }
|
---|
| 557 | // If there is an application on console which reacts
|
---|
| 558 | // to keypresses, we need to make our first sleep
|
---|
| 559 | // shorter to quickly redraw whatever it printed there.
|
---|
| 560 | poll_timeout_ms = 20;
|
---|
| 561 | }
|
---|
| 562 | }
|
---|
[3232] | 563 | // We sometimes get spurious IO errors on the TTY
|
---|
| 564 | // as programs close and re-open it
|
---|
| 565 | else if (errno != EIO || ++G.ioerror_count > 4) {
|
---|
| 566 | if (ENABLE_FEATURE_CLEAN_UP)
|
---|
| 567 | close(handle);
|
---|
| 568 | goto abort;
|
---|
| 569 | }
|
---|
[2725] | 570 | // Close & re-open tty in case they have
|
---|
| 571 | // swapped virtual consoles
|
---|
| 572 | close(handle);
|
---|
| 573 | }
|
---|
| 574 | } /* while (1) */
|
---|
[3232] | 575 | abort:
|
---|
| 576 | cleanup(EXIT_FAILURE);
|
---|
[2725] | 577 | }
|
---|