ttyname-based implementation

consoletype.c (text/plain), 818 bytes, created by Robert Millan on 2005-08-20 02:46:42 UTC

/* consoletype.c

  simple app to figure out whether the current terminal
  is serial, console (vt), or remote (pty).

  Copyright 2005 Robert Millan <[e-mail]>
  Distributed under the terms of the GNU General Public License v2
*/

#include <stdio.h>
#include <stdlib.h>  /* exit */
#include <unistd.h>

main ()
  {
    char *tty, *msg;

    tty = ttyname (0);
    if (tty == NULL)
      {
        fprintf (stderr, "Not a tty.\n");
        exit (1);
      }

    /* Nuke "/dev/" */
    tty += 5;

    if (!strncmp (tty, "ttyS", 4) || !strncmp (tty, "cuaa", 4))
      msg = "serial";
    else if (!strncmp (tty, "pts/", 4) || !strncmp (tty, "ttyp", 4))
      msg = "pty";
    else if (!strncmp (tty, "tty", 3))
      msg = "console";
    else
      msg = "unknown";

    printf ("%s\n", msg);
    exit (0);
  }