[php-src] Issue #10495: feof hangs indefinitely

Issue: https://github.com/php/php-src/issues/10495 Author: bytestream ### Description I am using horde/imap-client to connect to an IMAPS server. If I disconnect the local network interface after a couple of iterations of https://github.com/bytestream/Imap_Client/blob/ac98de92168777fb8bf0bacf3129fc178523defe/lib/Horde/Imap/Client/Socket/Connection/Socket.php#L186 when it's downloading a 30MB email body then feof hangs indefintely. stream_set_timeout(30); and default_socket_timeout of 60 seem to have no effect... The following is an example to illustrate the problem, and should not be used as a test case: ```php <?php $_stream = @stream_socket_client( "ssl://server.com:993", $error_number, $error_string, 30, STREAM_CLIENT_CONNECT, stream_context_create([ 'ssl' => [ 'verify_peer' => false, 'verify_peer_name' => false, 'cafile' => '/etc/ssl/certs/ca-certificates.crt', 'allow_self_signed' => true, ], ]) ); stream_set_timeout($_stream, 30); stream_set_read_buffer($_stream, 0); stream_set_write_buffer($_stream, 0); while (!feof($_stream)) { $in = fread($_stream, 8192); } ``` If I dump stream metadata, the result never changes: ``` array(8) { ["crypto"]=> array(4) { ["protocol"]=> string(7) "TLSv1.2" ["cipher_name"]=> string(27) "ECDHE-RSA-AES128-GCM-SHA256" ["cipher_bits"]=> int(128) ["cipher_version"]=> string(7) "TLSv1.2" } ["timed_out"]=> bool(false) ["blocked"]=> bool(true) ["eof"]=> bool(false) ["stream_type"]=> string(14) "tcp_socket/ssl" ["mode"]=> string(2) "r+" ["unread_bytes"]=> int(0) ["seekable"]=> bool(false) } ``` When using slightly modified code of: ``` while ($literal_len > 0) { sleep(3); if (! is_resource($this->_stream) || feof($this->_stream)) { ``` strace at the point where the process hangs shows: ``` 16:57:11.921521 clock_nanosleep(CLOCK_REALTIME, 0, {tv_sec=3, tv_nsec=0}, 0x7fffb50a22b0) = 0 16:57:14.930968 poll([{fd=11, events=POLLIN|POLLPRI|POLLERR|POLLHUP}], 1, 0) = 1 ([{fd=11, revents=POLLIN}]) 16:57:14.931033 read(11, "\27\3\3\20\30", 5) = 5 | 00000 17 03 03 10 18 ..... | 16:57:14.931068 read(11, "\26c\306", 4120) = 3 | 00000 16 63 c6 .c. | 16:57:14.931094 read(11, ``` File descriptor 11 is the socket to the IMAPS server. ### PHP Version PHP 8.1.11 ### Operating System _No response_