#include <ruby.h>
#include <unistd.h>

static VALUE fd_ttyname(VALUE self, VALUE fd)
{
	char * name = ttyname(NUM2INT(fd));

	if (name == NULL)
		rb_raise(rb_eRuntimeError, "not a TTY device");

	return rb_str_new2(name);
}

void Init_ttyname()
{
	VALUE mTTYName = rb_define_module("TTYName");
	rb_define_singleton_method(mTTYName, "ttyname", fd_ttyname, 1);
}