lib/libc/unistd/isatty.c


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#include <termios.h>
#include <unistd.h>
#include <syscall.h>
#include <asm-generic/ioctls.h>

int isatty(int fildes)
{
	struct winsize winsize;
	return 1 + syscall(ioctl, fildes, TIOCGWINSZ, &winsize);
}