manual/examples/termios.c

   1 #include <unistd.h>
   2 #include <stdio.h>
   3 #include <stdlib.h>
   4 #include <termios.h>
   5
   6 /* Use this variable to remember original terminal attributes. */
   7
   8 struct termios saved_attributes;
   9
  10 void
  11 reset_input_mode (void)
  12 {
  13   tcsetattr (STDIN_FILENO, TCSANOW, &saved_attributes);
  14 }
  15
  16 void
  17 set_input_mode (void)
  18 {
  19   struct termios tattr;
  20   char *name;
  21
  22   /* Make sure stdin is a terminal. */
  23   if (!isatty (STDIN_FILENO))
  24     {
  25       fprintf (stderr, "Not a terminal.\n");
  26       exit (EXIT_FAILURE);
  27     }
  28
  29   /* Save the terminal attributes so we can restore them later. */
  30   tcgetattr (STDIN_FILENO, &saved_attributes);
  31   atexit (reset_input_mode);
  32
  33 /*@group*/
  34   /* Set the funny terminal modes. */
  35   tcgetattr (STDIN_FILENO, &tattr);
  36   tattr.c_lflag &= ~(ICANON|ECHO); /* Clear ICANON and ECHO.  */
  37   tattr.c_cc[VMIN] = 1;
  38   tattr.c_cc[VTIME] = 0;
  39   tcsetattr (STDIN_FILENO, TCSAFLUSH, &tattr);
  40 }
  41 /*@end group*/
  42
  43 int
  44 main (void)
  45 {
  46   char c;
  47
  48   set_input_mode ();
  49
  50   while (1)
  51     {
  52       read (STDIN_FILENO, &c, 1);
  53       if (c == '\004')          /* @kbd{C-d} */
  54         break;
  55       else
  56         putchar (c);
  57     }
  58
  59   return EXIT_SUCCESS;
  60 }