V9/libc/gen/isatty.c

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/*
 * Returns 1 iff file is a tty
 */

#include <sys/ttyio.h>

isatty(f)
{
	extern errno;
	struct sgttyb ttyb;

	if (ioctl(f, TIOCGETP, &ttyb) < 0) {
		errno = 0;
		return(0);
	}
	return(1);
}