Fix connect timeout for non-linux targets, read readiness of socket c…

…onnection before returning success

library/std/src/sys/pal/unix/net.rs

@@ -213,15 +213,9 @@ impl Socket {
  }
  0 => {}
  _ => {
- // linux returns POLLOUT|POLLERR|POLLHUP for refused connections (!), so look
- // for POLLHUP rather than read readiness
- if pollfd.revents & libc::POLLHUP != 0 {
- let e = self.take_error()?.unwrap_or_else(|| {
- io::const_io_error!(
- io::ErrorKind::Uncategorized,
- "no error set after POLLHUP",
- )
- });
+ // Check if the connnection actually succeeded and return ok only when
+ // the socket is ready and no errors were found
+ if let Some(e) = self.take_error()? {
  return Err(e);
  }