Zig

Bind and Listen on an Available Port in a Range

Demonstrates Socket.BindAndListenPortRange, which searches an inclusive port range for an available TCP port, binds it, and begins listening. It returns the selected port, or -1 on failure.

Background. This is useful when any of several ports is acceptable and the application needs to discover which one was bound.

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const std = @import("std");
const chilkat = @import("chilkat");

pub fn main(init: std.process.Init) !void {
    const alloc = init.arena.allocator();

    const socket = try chilkat.Socket.init();
    defer socket.deinit();

    // Search the inclusive port range for an available TCP port, bind it, and begin listening.  The
    // method returns the selected port, or -1 when no port can be bound.
    const bound_port = socket.bindAndListenPortRange(5000, 5100, 25);
    if (bound_port < 0) {
        std.debug.print("{s}\n", .{try socket.getLastErrorText(alloc)});
        return;
    }

    std.debug.print("Listening on port {d}\n", .{bound_port});
}