How can I check whether a port is open?

Help
1

I’m writing a utility which checks whether a given port on my computer is open or not.

For example, if port 443 is open, I’d like to print it.

So far I have:

const std = @import("std");
const io = std.testing.io;

test "scan port 443 on localhost" {
    const address = try std.Io.net.IpAddress.parseLiteral("127.0.0.1:443");

    const stream = try std.Io.net.IpAddress.connect(address, io, .{ .mode = .stream, .protocol = .tcp });

    //

}

but I’m not sure if this is right, and if it is, how to use the stream object.

Appreciate any pointers.

2

No need to use the stream, just handle ConnectionRefused