Add stream_supports_lock() function (Benjamin Schulz)

ext/standard/basic_functions.c

@@ -2309,6 +2309,11 @@ ZEND_BEGIN_ARG_INFO(arginfo_stream_is_local, 0)
 	ZEND_ARG_INFO(0, stream)
 ZEND_END_ARG_INFO()
 
+static
+ZEND_BEGIN_ARG_INFO_EX(arginfo_stream_supports_lock, 0, 0, 1)
+    ZEND_ARG_INFO(0, stream)
+ZEND_END_ARG_INFO()
+
 static
 ZEND_BEGIN_ARG_INFO_EX(arginfo_stream_select, 0, 0, 4)
 	ZEND_ARG_INFO(1, read_streams) /* ARRAY_INFO(1, read_streams, 1) */
@@ -3532,6 +3537,7 @@ const zend_function_entry basic_functions[] = { /* {{{ */
 #endif
 	PHP_FE(stream_copy_to_stream,											arginfo_stream_copy_to_stream)
 	PHP_FE(stream_get_contents,												arginfo_stream_get_contents)
+	PHP_FE(stream_supports_lock,											arginfo_stream_supports_lock)
 	PHP_FE(stream_resolve_include_path,										arginfo_stream_resolve_include_path)
 	PHP_FE(fgetcsv,															arginfo_fgetcsv)
 	PHP_FE(fputcsv,															arginfo_fputcsv)

ext/standard/streamsfuncs.c

@@ -1677,6 +1677,26 @@ PHP_FUNCTION(stream_is_local)
 }
 /* }}} */
 
+/* {{{ proto bool stream_supports_lock(resource stream)
+   Tells wether the stream supports locking through flock(). */
+PHP_FUNCTION(stream_supports_lock)
+{
+	php_stream *stream;
+	zval *zsrc;
+
+	if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "r", &zsrc) == FAILURE) {
+		RETURN_FALSE;
+	}
+
+	php_stream_from_zval(stream, &zsrc);
+
+	if (!php_stream_supports_lock(stream)) {
+		RETURN_FALSE;
+	}
+
+	RETURN_TRUE;
+}
+
 #ifdef HAVE_SHUTDOWN
 /* {{{ proto int stream_socket_shutdown(resource stream, int how) U
 	causes all or part of a full-duplex connection on the socket associated

ext/standard/streamsfuncs.h

@@ -58,6 +58,7 @@ PHP_FUNCTION(stream_socket_shutdown);
 PHP_FUNCTION(stream_socket_pair);
 PHP_FUNCTION(stream_resolve_include_path);
 PHP_FUNCTION(stream_is_local);
+PHP_FUNCTION(stream_supports_lock);
 
 /*
  * Local variables:

ext/standard/tests/file/stream_supports_lock.phpt

@@ -0,0 +1,44 @@
+--TEST--
+stream_supports_lock
+--FILE--
+<?php
+$fp = fopen(__FILE__, "r");
+var_dump($fp);
+var_dump(stream_supports_lock($fp));
+fclose($fp);
+
+$fp = fopen("file://" . __FILE__, "r");
+var_dump($fp);
+var_dump(stream_supports_lock($fp));
+fclose($fp);
+
+$fp = fopen("php://memory", "r");
+var_dump($fp);
+var_dump(stream_supports_lock($fp));
+fclose($fp);
+
+$fp = fopen('data://text/plain,foobar', 'r');
+var_dump($fp);
+var_dump(stream_supports_lock($fp));
+fclose($fp);
+
+$sock = stream_context_create();
+var_dump($sock);
+var_dump(stream_supports_lock($sock));
+
+echo "Done\n";
+?>
+--EXPECTF--	
+resource(%d) of type (stream)
+bool(true)
+resource(%d) of type (stream)
+bool(true)
+resource(%d) of type (stream)
+bool(false)
+resource(%d) of type (stream)
+bool(false)
+resource(%d) of type (stream-context)
+
+Warning: stream_supports_lock(): supplied resource is not a valid stream resource in %s on line %d
+bool(false)
+Done