1 #ifndef lint 2 static char sccsid[] = "@(#)isatty.c 5.1 (Berkeley) 06/05/85"; 3 #endif not lint 4 5 /* 6 * Returns 1 iff file is a tty 7 */ 8 9 #include <sgtty.h> 10 11 isatty(f) 12 { 13 struct sgttyb ttyb; 14 15 if (ioctl(f, TIOCGETP, &ttyb) < 0) 16 return(0); 17 return(1); 18 } 19