[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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[3621] | 45 | #include "common_bufsiz.h"
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[2725] | 46 | #include <sys/kd.h>
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| 47 |
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| 48 | #define ESC "\033"
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[3232] | 49 | #define CURSOR_ON -1
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| 50 | #define CURSOR_OFF 1
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[2725] | 51 |
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[3232] | 52 | #define DEV_TTY "/dev/tty"
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| 53 | #define DEV_VCSA "/dev/vcsa"
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| 54 |
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[2725] | 55 | struct screen_info {
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| 56 | unsigned char lines, cols, cursor_x, cursor_y;
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| 57 | };
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| 58 |
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| 59 | #define CHAR(x) (*(uint8_t*)(x))
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| 60 | #define ATTR(x) (((uint8_t*)(x))[1])
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| 61 | #define NEXT(x) ((x) += 2)
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| 62 | #define DATA(x) (*(uint16_t*)(x))
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| 63 |
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| 64 | struct globals {
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| 65 | char* data;
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| 66 | int size;
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| 67 | int x, y;
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| 68 | int kbd_fd;
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| 69 | int ioerror_count;
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| 70 | int key_count;
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| 71 | int escape_count;
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| 72 | int nokeys;
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| 73 | int current;
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| 74 | int first_line_offset;
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| 75 | int last_attr;
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| 76 | // cached local tty parameters
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| 77 | unsigned width;
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| 78 | unsigned height;
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| 79 | unsigned col;
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| 80 | unsigned line;
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| 81 | smallint curoff; // unknown:0 cursor on:-1 cursor off:1
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[3232] | 82 | char attrbuf[sizeof("0;1;5;30;40m")];
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[2725] | 83 | // remote console
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| 84 | struct screen_info remote;
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| 85 | // saved local tty terminfo
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| 86 | struct termios term_orig;
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[3232] | 87 | char vcsa_name[sizeof(DEV_VCSA "NN")];
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[2725] | 88 | };
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| 89 |
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| 90 | #define G (*ptr_to_globals)
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| 91 | #define INIT_G() do { \
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| 92 | SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
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| 93 | G.width = G.height = UINT_MAX; \
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| 94 | G.last_attr--; \
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| 95 | } while (0)
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| 96 |
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| 97 | enum {
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| 98 | FLAG_v, // view only
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| 99 | FLAG_c, // create device if need
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[3232] | 100 | FLAG_Q, // never exit
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[2725] | 101 | FLAG_s, // session
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| 102 | FLAG_n, // no colors
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| 103 | FLAG_d, // dump screen
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| 104 | FLAG_f, // follow cursor
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[3232] | 105 | FLAG_F, // framebuffer
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[2725] | 106 | };
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| 107 | #define FLAG(x) (1 << FLAG_##x)
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| 108 | #define BW (option_mask32 & FLAG(n))
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| 109 |
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[3232] | 110 | static void putcsi(const char *s)
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| 111 | {
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| 112 | fputs(ESC"[", stdout);
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| 113 | fputs(s, stdout);
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| 114 | }
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| 115 |
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[2725] | 116 | static void clrscr(void)
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| 117 | {
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| 118 | // Home, clear till end of screen
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[3232] | 119 | putcsi("1;1H" ESC"[J");
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[2725] | 120 | G.col = G.line = 0;
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| 121 | }
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| 122 |
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| 123 | static void set_cursor(int state)
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| 124 | {
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| 125 | if (G.curoff != state) {
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| 126 | G.curoff = state;
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[3232] | 127 | putcsi("?25");
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[2725] | 128 | bb_putchar("h?l"[1 + state]);
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| 129 | }
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| 130 | }
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| 131 |
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| 132 | static void gotoxy(int col, int line)
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| 133 | {
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| 134 | if (G.col != col || G.line != line) {
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| 135 | G.col = col;
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| 136 | G.line = line;
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| 137 | printf(ESC"[%u;%uH", line + 1, col + 1);
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| 138 | }
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| 139 | }
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| 140 |
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[3232] | 141 | static void cleanup(int code) NORETURN;
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[2725] | 142 | static void cleanup(int code)
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| 143 | {
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[3232] | 144 | set_cursor(CURSOR_ON);
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[2725] | 145 | tcsetattr(G.kbd_fd, TCSANOW, &G.term_orig);
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| 146 | if (ENABLE_FEATURE_CLEAN_UP) {
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| 147 | close(G.kbd_fd);
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| 148 | }
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| 149 | // Reset attributes
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| 150 | if (!BW)
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[3232] | 151 | putcsi("0m");
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[2725] | 152 | bb_putchar('\n');
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[3232] | 153 | if (code > EXIT_FAILURE)
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[2725] | 154 | kill_myself_with_sig(code);
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| 155 | exit(code);
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| 156 | }
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| 157 |
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| 158 | static void screen_read_close(void)
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| 159 | {
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| 160 | unsigned i, j;
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| 161 | int vcsa_fd;
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| 162 | char *data;
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| 163 |
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| 164 | // Close & re-open vcsa in case they have swapped virtual consoles
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| 165 | vcsa_fd = xopen(G.vcsa_name, O_RDONLY);
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| 166 | xread(vcsa_fd, &G.remote, 4);
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| 167 | i = G.remote.cols * 2;
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| 168 | G.first_line_offset = G.y * i;
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| 169 | i *= G.remote.lines;
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| 170 | if (G.data == NULL) {
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| 171 | G.size = i;
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| 172 | G.data = xzalloc(2 * i);
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| 173 | }
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[3232] | 174 | if (G.size != i) {
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| 175 | cleanup(EXIT_FAILURE);
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[2725] | 176 | }
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| 177 | data = G.data + G.current;
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| 178 | xread(vcsa_fd, data, G.size);
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| 179 | close(vcsa_fd);
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| 180 | for (i = 0; i < G.remote.lines; i++) {
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| 181 | for (j = 0; j < G.remote.cols; j++, NEXT(data)) {
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| 182 | unsigned x = j - G.x; // if will catch j < G.x too
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| 183 | unsigned y = i - G.y; // if will catch i < G.y too
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| 184 |
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| 185 | if (y >= G.height || x >= G.width)
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| 186 | DATA(data) = 0;
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[3232] | 187 | else {
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| 188 | uint8_t ch = CHAR(data);
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| 189 | if (ch < ' ')
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| 190 | CHAR(data) = ch | 0x40;
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| 191 | else if (ch > 0x7e)
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| 192 | CHAR(data) = '?';
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| 193 | }
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[2725] | 194 | }
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| 195 | }
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| 196 | }
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| 197 |
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| 198 | static void screen_char(char *data)
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| 199 | {
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| 200 | if (!BW) {
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[3232] | 201 | uint8_t attr_diff;
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[2725] | 202 | uint8_t attr = ATTR(data);
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| 203 |
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[3232] | 204 | if (option_mask32 & FLAG(F)) {
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| 205 | attr >>= 1;
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| 206 | }
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| 207 | attr_diff = G.last_attr ^ attr;
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[2725] | 208 | if (attr_diff) {
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| 209 | // Attribute layout for VGA compatible text videobuffer:
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| 210 | // blinking text
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| 211 | // |red bkgd
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| 212 | // ||green bkgd
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| 213 | // |||blue bkgd
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| 214 | // vvvv
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| 215 | // 00000000 <- lsb bit on the right
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| 216 | // bold text / text 8th bit
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| 217 | // red text
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| 218 | // green text
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| 219 | // blue text
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| 220 | // TODO: apparently framebuffer-based console uses different layout
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| 221 | // (bug? attempt to get 8th text bit in better position?)
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| 222 | // red bkgd
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| 223 | // |green bkgd
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| 224 | // ||blue bkgd
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| 225 | // vvv
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| 226 | // 00000000 <- lsb bit on the right
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| 227 | // bold text
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| 228 | // red text
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| 229 | // green text
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| 230 | // blue text
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| 231 | // text 8th bit
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| 232 | // converting RGB color bit triad to BGR:
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| 233 | static const char color[8] = "04261537";
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| 234 | const uint8_t fg_mask = 0x07, bold_mask = 0x08;
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| 235 | const uint8_t bg_mask = 0x70, blink_mask = 0x80;
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| 236 | char *ptr;
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| 237 |
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[3232] | 238 | ptr = G.attrbuf;
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[2725] | 239 |
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| 240 | // (G.last_attr & ~attr) has 1 only where
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| 241 | // G.last_attr has 1 but attr has 0.
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| 242 | // Here we check whether we have transition
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| 243 | // bold->non-bold or blink->non-blink:
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| 244 | if (G.last_attr < 0 // initial value
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| 245 | || ((G.last_attr & ~attr) & (bold_mask | blink_mask)) != 0
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| 246 | ) {
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| 247 | *ptr++ = '0'; // "reset all attrs"
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| 248 | *ptr++ = ';';
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| 249 | // must set fg & bg, maybe need to set bold or blink:
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| 250 | attr_diff = attr | ~(bold_mask | blink_mask);
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| 251 | }
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| 252 | G.last_attr = attr;
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| 253 | if (attr_diff & bold_mask) {
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| 254 | *ptr++ = '1';
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| 255 | *ptr++ = ';';
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| 256 | }
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| 257 | if (attr_diff & blink_mask) {
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| 258 | *ptr++ = '5';
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| 259 | *ptr++ = ';';
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| 260 | }
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| 261 | if (attr_diff & fg_mask) {
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| 262 | *ptr++ = '3';
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| 263 | *ptr++ = color[attr & fg_mask];
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| 264 | *ptr++ = ';';
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| 265 | }
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| 266 | if (attr_diff & bg_mask) {
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| 267 | *ptr++ = '4';
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| 268 | *ptr++ = color[(attr & bg_mask) >> 4];
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[3232] | 269 | ptr++; // last attribute
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[2725] | 270 | }
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[3232] | 271 | if (ptr != G.attrbuf) {
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[2725] | 272 | ptr[-1] = 'm';
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| 273 | *ptr = '\0';
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[3232] | 274 | putcsi(G.attrbuf);
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[2725] | 275 | }
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| 276 | }
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| 277 | }
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| 278 | putchar(CHAR(data));
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| 279 | G.col++;
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| 280 | }
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| 281 |
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| 282 | static void screen_dump(void)
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| 283 | {
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| 284 | int linefeed_cnt;
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| 285 | int line, col;
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| 286 | int linecnt = G.remote.lines - G.y;
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| 287 | char *data = G.data + G.current + G.first_line_offset;
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| 288 |
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| 289 | linefeed_cnt = 0;
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| 290 | for (line = 0; line < linecnt && line < G.height; line++) {
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| 291 | int space_cnt = 0;
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| 292 | for (col = 0; col < G.remote.cols; col++, NEXT(data)) {
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| 293 | unsigned tty_col = col - G.x; // if will catch col < G.x too
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| 294 |
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| 295 | if (tty_col >= G.width)
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| 296 | continue;
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| 297 | space_cnt++;
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| 298 | if (BW && CHAR(data) == ' ')
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| 299 | continue;
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| 300 | while (linefeed_cnt != 0) {
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| 301 | //bb_putchar('\r'); - tty driver does it for us
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| 302 | bb_putchar('\n');
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| 303 | linefeed_cnt--;
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| 304 | }
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| 305 | while (--space_cnt)
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| 306 | bb_putchar(' ');
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| 307 | screen_char(data);
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| 308 | }
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| 309 | linefeed_cnt++;
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| 310 | }
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| 311 | }
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| 312 |
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| 313 | static void curmove(void)
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| 314 | {
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| 315 | unsigned cx = G.remote.cursor_x - G.x;
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| 316 | unsigned cy = G.remote.cursor_y - G.y;
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[3232] | 317 | int cursor = CURSOR_OFF;
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[2725] | 318 |
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| 319 | if (cx < G.width && cy < G.height) {
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| 320 | gotoxy(cx, cy);
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[3232] | 321 | cursor = CURSOR_ON;
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[2725] | 322 | }
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| 323 | set_cursor(cursor);
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| 324 | }
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| 325 |
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| 326 | static void create_cdev_if_doesnt_exist(const char* name, dev_t dev)
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| 327 | {
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| 328 | int fd = open(name, O_RDONLY);
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| 329 | if (fd != -1)
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| 330 | close(fd);
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| 331 | else if (errno == ENOENT)
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| 332 | mknod(name, S_IFCHR | 0660, dev);
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| 333 | }
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| 334 |
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| 335 | static NOINLINE void start_shell_in_child(const char* tty_name)
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| 336 | {
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| 337 | int pid = xvfork();
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| 338 | if (pid == 0) {
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| 339 | struct termios termchild;
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[3232] | 340 | const char *shell = get_shell_name();
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[2725] | 341 |
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| 342 | signal(SIGHUP, SIG_IGN);
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| 343 | // set tty as a controlling tty
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| 344 | setsid();
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| 345 | // make tty to be input, output, error
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| 346 | close(0);
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| 347 | xopen(tty_name, O_RDWR); // uses fd 0
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| 348 | xdup2(0, 1);
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| 349 | xdup2(0, 2);
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| 350 | ioctl(0, TIOCSCTTY, 1);
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| 351 | tcsetpgrp(0, getpid());
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| 352 | tcgetattr(0, &termchild);
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| 353 | termchild.c_lflag |= ECHO;
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| 354 | termchild.c_oflag |= ONLCR | XTABS;
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| 355 | termchild.c_iflag |= ICRNL;
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| 356 | termchild.c_iflag &= ~IXOFF;
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| 357 | tcsetattr_stdin_TCSANOW(&termchild);
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| 358 | execl(shell, shell, "-i", (char *) NULL);
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| 359 | bb_simple_perror_msg_and_die(shell);
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| 360 | }
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| 361 | }
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| 362 |
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| 363 | int conspy_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 364 | int conspy_main(int argc UNUSED_PARAM, char **argv)
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| 365 | {
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[3232] | 366 | char tty_name[sizeof(DEV_TTY "NN")];
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[2725] | 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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[3621] | 385 | #define keybuf bb_common_bufsiz1
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| 386 | setup_common_bufsiz();
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| 387 |
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[2725] | 388 | INIT_G();
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[3232] | 389 | strcpy(G.vcsa_name, DEV_VCSA);
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[2725] | 390 |
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| 391 | opt_complementary = "x+:y+"; // numeric params
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[3232] | 392 | opts = getopt32(argv, "vcQsndfFx:y:", &G.x, &G.y);
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[2725] | 393 | argv += optind;
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| 394 | ttynum = 0;
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| 395 | if (argv[0]) {
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| 396 | ttynum = xatou_range(argv[0], 0, 63);
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[3232] | 397 | sprintf(G.vcsa_name + sizeof(DEV_VCSA)-1, "%u", ttynum);
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[2725] | 398 | }
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[3232] | 399 | sprintf(tty_name, "%s%u", DEV_TTY, ttynum);
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[2725] | 400 | if (opts & FLAG(c)) {
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| 401 | if ((opts & (FLAG(s)|FLAG(v))) != FLAG(v))
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| 402 | create_cdev_if_doesnt_exist(tty_name, makedev(4, ttynum));
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| 403 | create_cdev_if_doesnt_exist(G.vcsa_name, makedev(7, 128 + ttynum));
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| 404 | }
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| 405 | if ((opts & FLAG(s)) && ttynum) {
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| 406 | start_shell_in_child(tty_name);
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| 407 | }
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| 408 |
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| 409 | screen_read_close();
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| 410 | if (opts & FLAG(d)) {
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| 411 | screen_dump();
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| 412 | bb_putchar('\n');
|
---|
| 413 | return 0;
|
---|
| 414 | }
|
---|
| 415 |
|
---|
| 416 | bb_signals(BB_FATAL_SIGS, cleanup);
|
---|
| 417 |
|
---|
| 418 | // All characters must be passed through to us unaltered
|
---|
| 419 | G.kbd_fd = xopen(CURRENT_TTY, O_RDONLY);
|
---|
| 420 | tcgetattr(G.kbd_fd, &G.term_orig);
|
---|
| 421 | termbuf = G.term_orig;
|
---|
| 422 | termbuf.c_iflag &= ~(BRKINT|INLCR|ICRNL|IXON|IXOFF|IUCLC|IXANY|IMAXBEL);
|
---|
| 423 | //termbuf.c_oflag &= ~(OPOST); - no, we still want \n -> \r\n
|
---|
| 424 | termbuf.c_lflag &= ~(ISIG|ICANON|ECHO);
|
---|
| 425 | termbuf.c_cc[VMIN] = 1;
|
---|
| 426 | termbuf.c_cc[VTIME] = 0;
|
---|
| 427 | tcsetattr(G.kbd_fd, TCSANOW, &termbuf);
|
---|
| 428 |
|
---|
| 429 | poll_timeout_ms = 250;
|
---|
| 430 | while (1) {
|
---|
| 431 | struct pollfd pfd;
|
---|
| 432 | int bytes_read;
|
---|
| 433 | int i, j;
|
---|
| 434 | char *data, *old;
|
---|
| 435 |
|
---|
| 436 | // in the first loop G.width = G.height = 0: refresh
|
---|
| 437 | i = G.width;
|
---|
| 438 | j = G.height;
|
---|
| 439 | get_terminal_width_height(G.kbd_fd, &G.width, &G.height);
|
---|
| 440 | if (option_mask32 & FLAG(f)) {
|
---|
| 441 | int nx = G.remote.cursor_x - G.width + 1;
|
---|
| 442 | int ny = G.remote.cursor_y - G.height + 1;
|
---|
| 443 |
|
---|
| 444 | if (G.remote.cursor_x < G.x) {
|
---|
| 445 | G.x = G.remote.cursor_x;
|
---|
| 446 | i = 0; // force refresh
|
---|
| 447 | }
|
---|
| 448 | if (nx > G.x) {
|
---|
| 449 | G.x = nx;
|
---|
| 450 | i = 0; // force refresh
|
---|
| 451 | }
|
---|
| 452 | if (G.remote.cursor_y < G.y) {
|
---|
| 453 | G.y = G.remote.cursor_y;
|
---|
| 454 | i = 0; // force refresh
|
---|
| 455 | }
|
---|
| 456 | if (ny > G.y) {
|
---|
| 457 | G.y = ny;
|
---|
| 458 | i = 0; // force refresh
|
---|
| 459 | }
|
---|
| 460 | }
|
---|
| 461 |
|
---|
| 462 | // Scan console data and redraw our tty where needed
|
---|
| 463 | old = G.data + G.current;
|
---|
| 464 | G.current = G.size - G.current;
|
---|
| 465 | data = G.data + G.current;
|
---|
| 466 | screen_read_close();
|
---|
| 467 | if (i != G.width || j != G.height) {
|
---|
| 468 | clrscr();
|
---|
| 469 | screen_dump();
|
---|
| 470 | } else {
|
---|
| 471 | // For each remote line
|
---|
| 472 | old += G.first_line_offset;
|
---|
| 473 | data += G.first_line_offset;
|
---|
| 474 | for (i = G.y; i < G.remote.lines; i++) {
|
---|
| 475 | char *first = NULL; // first char which needs updating
|
---|
| 476 | char *last = last; // last char which needs updating
|
---|
| 477 | unsigned iy = i - G.y;
|
---|
| 478 |
|
---|
| 479 | if (iy >= G.height)
|
---|
| 480 | break;
|
---|
| 481 | for (j = 0; j < G.remote.cols; j++, NEXT(old), NEXT(data)) {
|
---|
| 482 | unsigned jx = j - G.x; // if will catch j >= G.x too
|
---|
| 483 |
|
---|
| 484 | if (jx < G.width && DATA(data) != DATA(old)) {
|
---|
| 485 | last = data;
|
---|
| 486 | if (!first) {
|
---|
| 487 | first = data;
|
---|
| 488 | gotoxy(jx, iy);
|
---|
| 489 | }
|
---|
| 490 | }
|
---|
| 491 | }
|
---|
| 492 | if (first) {
|
---|
| 493 | // Rewrite updated data on the local screen
|
---|
| 494 | for (; first <= last; NEXT(first))
|
---|
| 495 | screen_char(first);
|
---|
| 496 | }
|
---|
| 497 | }
|
---|
| 498 | }
|
---|
| 499 | curmove();
|
---|
| 500 |
|
---|
| 501 | // Wait for local user keypresses
|
---|
| 502 | fflush_all();
|
---|
| 503 | pfd.fd = G.kbd_fd;
|
---|
| 504 | pfd.events = POLLIN;
|
---|
| 505 | bytes_read = 0;
|
---|
| 506 | switch (poll(&pfd, 1, poll_timeout_ms)) {
|
---|
| 507 | char *k;
|
---|
| 508 | case -1:
|
---|
| 509 | if (errno != EINTR)
|
---|
[3232] | 510 | goto abort;
|
---|
[2725] | 511 | break;
|
---|
| 512 | case 0:
|
---|
| 513 | if (++G.nokeys >= 4)
|
---|
| 514 | G.nokeys = G.escape_count = 0;
|
---|
| 515 | break;
|
---|
| 516 | default:
|
---|
| 517 | // Read the keys pressed
|
---|
| 518 | k = keybuf + G.key_count;
|
---|
[3621] | 519 | bytes_read = read(G.kbd_fd, k, COMMON_BUFSIZE - G.key_count);
|
---|
[2725] | 520 | if (bytes_read < 0)
|
---|
[3232] | 521 | goto abort;
|
---|
[2725] | 522 |
|
---|
| 523 | // Do exit processing
|
---|
[3232] | 524 | if (!(option_mask32 & FLAG(Q))) {
|
---|
| 525 | for (i = 0; i < bytes_read; i++) {
|
---|
| 526 | if (k[i] != '\033')
|
---|
| 527 | G.escape_count = -1;
|
---|
| 528 | if (++G.escape_count >= 3)
|
---|
| 529 | cleanup(EXIT_SUCCESS);
|
---|
| 530 | }
|
---|
[2725] | 531 | }
|
---|
| 532 | }
|
---|
| 533 | poll_timeout_ms = 250;
|
---|
[3232] | 534 | if (option_mask32 & FLAG(v)) continue;
|
---|
[2725] | 535 |
|
---|
| 536 | // Insert all keys pressed into the virtual console's input
|
---|
| 537 | // buffer. Don't do this if the virtual console is in scan
|
---|
| 538 | // code mode - giving ASCII characters to a program expecting
|
---|
| 539 | // scan codes will confuse it.
|
---|
[3232] | 540 | G.key_count += bytes_read;
|
---|
| 541 | if (G.escape_count == 0) {
|
---|
[2725] | 542 | int handle, result;
|
---|
| 543 | long kbd_mode;
|
---|
| 544 |
|
---|
| 545 | handle = xopen(tty_name, O_WRONLY);
|
---|
| 546 | result = ioctl(handle, KDGKBMODE, &kbd_mode);
|
---|
| 547 | if (result >= 0) {
|
---|
| 548 | char *p = keybuf;
|
---|
| 549 |
|
---|
[3232] | 550 | G.ioerror_count = 0;
|
---|
[2725] | 551 | if (kbd_mode != K_XLATE && kbd_mode != K_UNICODE) {
|
---|
| 552 | G.key_count = 0; // scan code mode
|
---|
| 553 | }
|
---|
| 554 | for (; G.key_count != 0; p++, G.key_count--) {
|
---|
| 555 | result = ioctl(handle, TIOCSTI, p);
|
---|
| 556 | if (result < 0) {
|
---|
| 557 | memmove(keybuf, p, G.key_count);
|
---|
| 558 | break;
|
---|
| 559 | }
|
---|
| 560 | // If there is an application on console which reacts
|
---|
| 561 | // to keypresses, we need to make our first sleep
|
---|
| 562 | // shorter to quickly redraw whatever it printed there.
|
---|
| 563 | poll_timeout_ms = 20;
|
---|
| 564 | }
|
---|
| 565 | }
|
---|
[3232] | 566 | // We sometimes get spurious IO errors on the TTY
|
---|
| 567 | // as programs close and re-open it
|
---|
| 568 | else if (errno != EIO || ++G.ioerror_count > 4) {
|
---|
| 569 | if (ENABLE_FEATURE_CLEAN_UP)
|
---|
| 570 | close(handle);
|
---|
| 571 | goto abort;
|
---|
| 572 | }
|
---|
[2725] | 573 | // Close & re-open tty in case they have
|
---|
| 574 | // swapped virtual consoles
|
---|
| 575 | close(handle);
|
---|
| 576 | }
|
---|
| 577 | } /* while (1) */
|
---|
[3232] | 578 | abort:
|
---|
| 579 | cleanup(EXIT_FAILURE);
|
---|
[2725] | 580 | }
|
---|