isatty.c « unistd « src - grovel - Unnamed repository; edit this file 'description' to name the repository.

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#include <unistd.h>
#include <sys/ioctl.h>
#include "syscall.h"

int isatty(int fd)
{
	struct winsize wsz;
	return !__syscall(SYS_ioctl, fd, TIOCGWINSZ, &wsz);
}