Fix GH-10406: feof() behavior change for UNIX based socket resources

ext/openssl/xp_ssl.c

@@ -2429,8 +2429,15 @@ static int php_openssl_sockop_set_option(php_stream *stream, int option, int val
 
 				if (sslsock->s.socket == -1) {
 					alive = 0;
-				} else if ((!sslsock->ssl_active && value == 0 && ((MSG_DONTWAIT != 0) || !sslsock->s.is_blocked)) ||
-					   php_pollfd_for(sslsock->s.socket, PHP_POLLREADABLE|POLLPRI, &tv) > 0) {
+				} else if (
+					(
+						!sslsock->ssl_active &&
+						value == 0 &&
+						!(stream->flags & PHP_STREAM_FLAG_NO_IO) &&
+						((MSG_DONTWAIT != 0) || !sslsock->s.is_blocked)
+					) ||
+					php_pollfd_for(sslsock->s.socket, PHP_POLLREADABLE|POLLPRI, &tv) > 0
+				) {
 					/* the poll() call was skipped if the socket is non-blocking (or MSG_DONTWAIT is available) and if the timeout is zero */
 					/* additionally, we don't use this optimization if SSL is active because in that case, we're not using MSG_DONTWAIT */
 					if (sslsock->ssl_active) {

ext/standard/tests/streams/gh10406.phpt

@@ -0,0 +1,20 @@
+--TEST--
+GH-10406: feof() behavior change for UNIX based socket resources
+--SKIPIF--
+<?php
+if (!strncasecmp(PHP_OS, 'WIN', 3)) die("skip. Do not run on Windows");
+?>
+--FILE--
+<?php
+$socket_path = '/tmp/gh-10406-test.socket';
+
+if (file_exists($socket_path)) {
+    unlink($socket_path);
+}
+
+$socket = stream_socket_server('unix://' . $socket_path);
+var_dump(feof($socket));
+unlink($socket_path);
+?>
+--EXPECT--
+bool(false)

main/php_streams.h

@@ -188,6 +188,8 @@ struct _php_stream_wrapper	{
 /* Do not close handle except it is explicitly closed by user (e.g. fclose) */
 #define PHP_STREAM_FLAG_NO_RSCR_DTOR_CLOSE			0x200
 
+#define PHP_STREAM_FLAG_NO_IO						0x400
+
 #define PHP_STREAM_FLAG_WAS_WRITTEN					0x80000000
 
 struct _php_stream  {

main/streams/transports.c

@@ -169,6 +169,9 @@ PHPAPI php_stream *_php_stream_xport_create(const char *name, size_t namelen, in
 							failed = true;
 						}
 					}
+					if (!failed) {
+						stream->flags |= PHP_STREAM_FLAG_NO_IO;
+					}
 				}
 			}
 		} zend_catch {

main/streams/xp_socket.c

@@ -337,7 +337,14 @@ static int php_sockop_set_option(php_stream *stream, int option, int value, void
 
 				if (sock->socket == -1) {
 					alive = 0;
-				} else if ((value == 0 && ((MSG_DONTWAIT != 0) || !sock->is_blocked)) || php_pollfd_for(sock->socket, PHP_POLLREADABLE|POLLPRI, &tv) > 0) {
+				} else if (
+					(
+						value == 0 &&
+						!(stream->flags & PHP_STREAM_FLAG_NO_IO) &&
+						((MSG_DONTWAIT != 0) || !sock->is_blocked)
+					) ||
+					php_pollfd_for(sock->socket, PHP_POLLREADABLE|POLLPRI, &tv) > 0
+				) {
 					/* the poll() call was skipped if the socket is non-blocking (or MSG_DONTWAIT is available) and if the timeout is zero */
 #ifdef PHP_WIN32
 					int ret;