1*1970Swnj /* @(#)isatty.c 4.1 (Berkeley) 12/21/80 */ 2*1970Swnj /* 3*1970Swnj * Returns 1 iff file is a tty 4*1970Swnj */ 5*1970Swnj 6*1970Swnj #include <sgtty.h> 7*1970Swnj 8*1970Swnj isatty(f) 9*1970Swnj { 10*1970Swnj struct sgttyb ttyb; 11*1970Swnj 12*1970Swnj if (gtty(f, &ttyb) < 0) 13*1970Swnj return(0); 14*1970Swnj return(1); 15*1970Swnj } 16