Fix GH-23879: Do not report AcceptFailed on non-blocking accept timeout

NEWS

@@ -2,6 +2,9 @@ PHP                                                                        NEWS
 |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
 ?? ??? ????, PHP 8.6.0RC3
 
+- Streams:
+  . Fixed bug GH-23879 (stream_socket_accept() reports AcceptFailed when a
+    non-blocking listener has no pending connection). (Lazizbek Ergashev)
 
 24 Sep 2026, PHP 8.6.0RC2
 

UPGRADING.INTERNALS

@@ -184,6 +184,9 @@ PHP 8.6 INTERNALS UPGRADE NOTES
     zval* that is IS_UNDEF when the closure is unbound.
   . object_properties_load() now verifies that the given value is assignable
     to typed properties. The check is performed in strict mode.
+  . php_stream_xport_accept() now returns 0 with a NULL client when a
+    non-blocking listener has no pending connection. Callers must check the
+    client, not only the return value.
 
 - Added:
   . New zend_class_entry.ce_flags2 and zend_function.fn_flags2 fields were

ext/openssl/xp_ssl.c

@@ -3556,6 +3556,10 @@ static inline int php_openssl_tcp_sockop_accept(php_stream *stream, php_openssl_
 				}
 			}
 		}
+	} else if (!sock->s.is_blocked && (xparam->outputs.error_code == PHP_TIMEOUT_ERROR_VALUE
+			|| PHP_IS_TRANSIENT_ERROR(xparam->outputs.error_code))) {
+		/* No pending connection is not an error for a non-blocking listener. */
+		return 0;
 	}
 
 	return xparam->outputs.client == NULL ? -1 : 0;

ext/standard/streamsfuncs.c

@@ -314,11 +314,13 @@ PHP_FUNCTION(stream_socket_accept)
 
 	php_stream_error_operation_begin();
 
-	if (0 == php_stream_xport_accept(stream, &clistream,
+	int ret = php_stream_xport_accept(stream, &clistream,
 				zpeername ? &peername : NULL,
 				NULL, NULL,
 				tv_pointer, &errstr
-				) && clistream) {
+				);
+
+	if (0 == ret && clistream) {
 
 		if (peername) {
 			ZEND_TRY_ASSIGN_REF_STR(zpeername, peername);
@@ -328,7 +330,9 @@ PHP_FUNCTION(stream_socket_accept)
 		if (peername) {
 			zend_string_release(peername);
 		}
-		php_stream_warn(stream, AcceptFailed, "Accept failed: %s", errstr ? ZSTR_VAL(errstr) : "Unknown error");
+		if (0 != ret) {
+			php_stream_warn(stream, AcceptFailed, "Accept failed: %s", errstr ? ZSTR_VAL(errstr) : "Unknown error");
+		}
 		RETVAL_FALSE;
 	}
 

ext/standard/tests/streams/gh23879.phpt

@@ -0,0 +1,36 @@
+--TEST--
+GH-23879 (stream_socket_accept() reports AcceptFailed when a non-blocking listener has no pending connection)
+--FILE--
+<?php
+$server = stream_socket_server(
+    'tcp://127.0.0.1:0',
+    context: stream_context_create([
+        'stream' => [
+            'error_mode' => StreamErrorMode::Exception,
+            'error_store' => StreamErrorStore::All,
+        ],
+    ]),
+);
+stream_set_blocking($server, false);
+
+var_dump(stream_socket_accept($server, 0));
+var_dump(stream_last_errors());
+
+$client = stream_socket_client('tcp://' . stream_socket_get_name($server, false));
+var_dump(is_resource(stream_socket_accept($server, 1)));
+var_dump(stream_socket_accept($server, 0));
+
+stream_set_blocking($server, true);
+try {
+    stream_socket_accept($server, 0);
+} catch (StreamException $e) {
+    var_dump($e->getErrors()[0]->code);
+}
+?>
+--EXPECT--
+bool(false)
+array(0) {
+}
+bool(true)
+bool(false)
+enum(StreamErrorCode::AcceptFailed)

main/network.c

@@ -69,7 +69,6 @@
 # include "win32/time.h"
 # define SOCK_ERR INVALID_SOCKET
 # define SOCK_CONN_ERR SOCKET_ERROR
-# define PHP_TIMEOUT_ERROR_VALUE		WSAETIMEDOUT
 
 #ifdef HAVE_IPV6
 const struct in6_addr in6addr_any = {0}; /* IN6ADDR_ANY_INIT; */
@@ -78,7 +77,6 @@ const struct in6_addr in6addr_any = {0}; /* IN6ADDR_ANY_INIT; */
 #else
 # define SOCK_ERR -1
 # define SOCK_CONN_ERR -1
-# define PHP_TIMEOUT_ERROR_VALUE		ETIMEDOUT
 #endif
 
 #ifdef HAVE_GETADDRINFO

main/php_network.h

@@ -109,10 +109,12 @@ typedef int php_socket_t;
 # define SOCK_ERR INVALID_SOCKET
 # define SOCK_CONN_ERR SOCKET_ERROR
 # define SOCK_RECV_ERR SOCKET_ERROR
+# define PHP_TIMEOUT_ERROR_VALUE WSAETIMEDOUT
 #else
 # define SOCK_ERR -1
 # define SOCK_CONN_ERR -1
 # define SOCK_RECV_ERR -1
+# define PHP_TIMEOUT_ERROR_VALUE ETIMEDOUT
 #endif
 
 #define STREAM_SOCKOP_NONE                (1 << 0)

main/streams/xp_socket.c

@@ -1086,6 +1086,10 @@ static inline int php_tcp_sockop_accept(php_stream *stream, php_netstream_data_t
 				GC_ADDREF(stream->ctx);
 			}
 		}
+	} else if (!sock->is_blocked && (xparam->outputs.error_code == PHP_TIMEOUT_ERROR_VALUE
+			|| PHP_IS_TRANSIENT_ERROR(xparam->outputs.error_code))) {
+		/* No pending connection is not an error for a non-blocking listener. */
+		return 0;
 	}
 
 	return xparam->outputs.client == NULL ? -1 : 0;