2.9BSD - /usr/src/lib/c/gen/isatty.c

   1: /*	@(#)isatty.c	2.1	SCCS id keyword	*/
   2: /*
   3:  * Returns 1 iff file is a tty
   4:  */
   5: 
   6: #include <sgtty.h>
   7: 
   8: isatty(f)
   9: {
  10:     struct sgttyb ttyb;
  11: 
  12:     if (gtty(f, &ttyb) < 0)
  13:         return(0);
  14:     return(1);
  15: }

Defined functions