Mac ioctl

[systemcrash]

Provide ioctl on mac.

macOS/Darwin has ioctl, but the mappings are a bit different.

Verified using:

import * as io from 'io';
import * as struct from 'struct';

let handle = io.open('/dev/tty', io.O_RDWR);
if (!handle) {
	print('open failed:', io.error(), '\n');
	return;
}

let req = 0x40087468;   // macOS TIOCGWINSZ raw request
let buf = handle.ioctl(io.IOC_DIR_READ, req, 0, 8);
if (!buf) {
	print('ioctl failed:', io.error(), '\n');
}

/*
struct winsize {
	unsigned short ws_row;
	unsigned short ws_col;
	unsigned short ws_xpixel;
	unsigned short ws_ypixel;
};
*/
let arr = struct.unpack('HHHH', buf);

print('winsize:\n');
print('  rows:   ', arr[0], '\n');
print('  cols:   ', arr[1], '\n');
print('  xpixel: ', arr[2], '\n');
print('  ypixel: ', arr[3], '\n');

handle.close();

result:

winsize:
  rows:   71
  cols:   183
  xpixel: 2562
  ypixel: 1846