Meg's Mirrors

zig

1	#include <unistd.h>
2	#include <errno.h>
3	#include <sys/ioctl.h>
4	#include "syscall.h"
5
6	int isatty(int fd)
7	{
8	struct winsize wsz;
9	unsigned long r = syscall(SYS_ioctl, fd, TIOCGWINSZ, &wsz);
10	if (r == 0) return 1;
11	if (errno != EBADF) errno = ENOTTY;
12	return 0;
13	}