setNonBlocking

Set a file descriptor to non-blocking mode.

This helper sets the O_NONBLOCK flag on a file descriptor, which is required for proper event loop integration. User-provided handles registered with registerIo() should be set to non-blocking mode to prevent the event loop from stalling on blocking reads/writes.

auto handle = Handle(STDIN_FILENO);
if (setNonBlocking(handle) != 0) {
   // Handle error
}
loop.registerIo(handle, IoInterest.readable, &onReadable);