commands/simple/tty.c

   1 /* tty.c - Return tty name              Author: Freeman P. Pascal IV */
   2
   3 /* Minor changes to make tty conform to POSIX1003.2 Draft10
   4    Thomas Brupbacher (tobr@mw.lpc.ethz.ch)                      */
   5
   6 #include <sys/types.h>
   7 #include <stdlib.h>
   8 #include <string.h>
   9 #include <unistd.h>
  10 #include <stdio.h>
  11
  12 _PROTOTYPE(int main, (int argc, char **argv));
  13
  14 int main(argc, argv)
  15 int argc;
  16 char *argv[];
  17 {
  18   char *tty_name;
  19
  20   tty_name = ttyname(STDIN_FILENO);
  21   if ((argc == 2) && (!strcmp(argv[1], "-s")))
  22          /* Do nothing - shhh! we're in silent mode */ ;
  23   else
  24         puts((tty_name != NULL) ? tty_name : "not a tty");
  25
  26   if (isatty(STDIN_FILENO) == 0)
  27         return(1);
  28   else
  29         return(0);
  30 }