Fix connect timeout for non-linux targets, read readiness of socket connection before returning success

Author: B I Mohammed Abbas

Diff for: 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);
                     }