131 lines
2.9 KiB
C
131 lines
2.9 KiB
C
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/* Unix pty slave program -- David Decotigny 2005
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License: GNU GPL version 2
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Most of it taken from the GNU C library doc examples */
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#include <utmp.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <termios.h>
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/**
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* @file termslave.c
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*
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* Linux pseudo-TTY slave program. To be used with "qemu -monitor pty"
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* to access qemu's monitor from any linux terminal. To use it, launch
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* a "qemu -monitor pty" in one terminal, take a look at the first
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* line stating "char device redirected to /dev/pts/4" for example,
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* and lauch the termslave program as "./termslave /dev/pts/4" in
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* another terminal.
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*
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* To make this correctly work, one has to apply the
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* patch-qemu-pty.diff patch to qemu < 0.8.0 (qemu 0.8.0 and beyond
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* already includes this patch).
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*
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* This program also works with the "-serial pty" flag of qemu. It can
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* be used to send commands to the SOS serial-line shell (article 9).
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*/
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/* Use this variable to remember original terminal attributes. */
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struct termios saved_attributes;
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static void
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reset_input_mode (void)
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{
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tcsetattr (STDIN_FILENO, TCSANOW, &saved_attributes);
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}
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static void
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set_input_mode (void)
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{
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struct termios tattr;
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/* Make sure stdin is a terminal. */
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if (!isatty (STDIN_FILENO))
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{
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fprintf (stderr, "Not a terminal.\n");
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exit (EXIT_FAILURE);
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}
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/* Save the terminal attributes so we can restore them later. */
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tcgetattr (STDIN_FILENO, &saved_attributes);
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atexit (reset_input_mode);
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/* Set the funny terminal modes. */
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tcgetattr (STDIN_FILENO, &tattr);
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tattr.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP
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|INLCR|IGNCR|ICRNL|IXON);
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tattr.c_lflag &= ~(ICANON|ECHO);
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tattr.c_cflag |= CLOCAL;
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tattr.c_cc[VMIN] = 1;
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tattr.c_cc[VTIME] = 0;
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tcsetattr (STDIN_FILENO, TCSAFLUSH, &tattr);
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}
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int main (int argc, char *argv[])
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{
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int term;
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if (argc < 2)
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{
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fprintf(stderr, "Usage: %s /dev/pts/number\n", argv[0]);
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return -1;
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}
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term = open(argv[1], O_RDWR);
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if (term < 0)
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{
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perror("open");
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return -1;
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}
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if (! isatty(term))
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{
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fprintf(stderr, "%s is not a valid terminal\n", argv[1]);
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return -1;
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}
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set_input_mode();
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while (1)
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{
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fd_set cur_set;
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FD_ZERO(& cur_set);
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FD_SET(STDIN_FILENO, & cur_set);
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FD_SET(term, & cur_set);
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if (select(FD_SETSIZE, & cur_set, NULL, NULL, NULL) < 1)
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continue;
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if (FD_ISSET(term, & cur_set))
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{
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char buf[1024];
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int len = read(term, buf, sizeof(buf));
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if (len >= 1)
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write(STDOUT_FILENO, buf, len);
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else
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{
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fprintf(stderr, "Master exitted\n");
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break;
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}
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}
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if (FD_ISSET(STDIN_FILENO, & cur_set))
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{
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char c;
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if (read(STDIN_FILENO, &c, 1) == 1)
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{
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if (c == 0x4) /* ctrl-D */
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break;
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write(term, &c, 1);
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}
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else
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break;
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}
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}
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return 0;
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}
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