Remove include "sanity check" to get better error

Instead of rejecting directories / non-regular files early with
a generic error, we should just accept them and error later when a
read is attempted. This is more general and will generate a better
error message on Linux. On Windows, the error remains the same as
before.

Author: nikic

Zend/tests/require_directory.phpt

@@ -0,0 +1,21 @@
+--TEST--
+Including a directory generates an error
+--SKIPIF--
+<?php
+if (PHP_OS_FAMILY === 'Windows') die("skip Not for Windows");
+?>
+--FILE--
+<?php
+
+/* Just a random test directory */
+$dir = __DIR__ . '/variadic';
+require $dir;
+
+?>
+--EXPECTF--
+Notice: require(): Read of %d bytes failed with errno=21 Is a directory in %s on line %d
+
+Fatal error: Uncaught Error: Failed opening required '%s' (include_path='.:') in %s:%d
+Stack trace:
+#0 {main}
+  thrown in %s on line %d

Zend/tests/require_directory_windows.phpt

@@ -0,0 +1,21 @@
+--TEST--
+Including a directory generates an error (Windows variant)
+--SKIPIF--
+<?php
+if (PHP_OS_FAMILY !== 'Windows') die("skip Only for Windows");
+?>
+--FILE--
+<?php
+
+/* Just a random test directory */
+$dir = __DIR__ . '/variadic';
+require $dir;
+
+?>
+--EXPECTF--
+Warning: require(%s): Failed to open stream: Permission denied in %s on line %d
+
+Fatal error: Uncaught Error: Failed opening required '%s' (include_path='.:') in %s:%d
+Stack trace:
+#0 {main}
+  thrown in %s on line %d

ext/standard/tests/file/bug35740.phpt

@@ -1,5 +1,9 @@
 --TEST--
 Bug #35740 (memory leak when including a directory)
+--SKIPIF--
+<?php
+if (PHP_OS_FAMILY === 'Windows') die("skip Not for Windows");
+?>
 --FILE--
 <?php
 
@@ -8,7 +12,7 @@ include (__DIR__);
 echo "Done\n";
 ?>
 --EXPECTF--
-Warning: include(%s): Failed to open stream: %s in %s on line %d
+Notice: include(): Read of %s bytes failed with errno=21 Is a directory in %s on line %d
 
 Warning: include(): Failed opening '%s' for inclusion (include_path='%s') in %s on line %d
 Done

main/streams/plain_wrapper.c

@@ -135,7 +135,6 @@ typedef struct {
 	unsigned is_pipe:1;		/* stream is an actual pipe, currently Windows only*/
 	unsigned cached_fstat:1;	/* sb is valid */
 	unsigned is_pipe_blocking:1; /* allow blocking read() on pipes, currently Windows only */
-	unsigned no_forced_fstat:1;  /* Use fstat cache even if forced */
 	unsigned is_seekable:1;		/* don't try and seek, if not set */
 	unsigned _reserved:26;
 
@@ -161,7 +160,7 @@ typedef struct {
 
 static int do_fstat(php_stdio_stream_data *d, int force)
 {
-	if (!d->cached_fstat || (force && !d->no_forced_fstat)) {
+	if (!d->cached_fstat || force) {
 		int fd;
 		int r;
 
@@ -1188,30 +1187,7 @@ PHPAPI php_stream *_php_stream_fopen(const char *filename, const char *mode, zen
 				efree(persistent_id);
 			}
 
-			/* WIN32 always set ISREG flag */
 #ifndef PHP_WIN32
-			/* sanity checks for include/require.
-			 * We check these after opening the stream, so that we save
-			 * on fstat() syscalls */
-			if (options & STREAM_OPEN_FOR_INCLUDE) {
-				php_stdio_stream_data *self = (php_stdio_stream_data*)ret->abstract;
-				int r;
-
-				r = do_fstat(self, 0);
-				if ((r == 0 && !S_ISREG(self->sb.st_mode))) {
-					if (opened_path) {
-						zend_string_release_ex(*opened_path, 0);
-						*opened_path = NULL;
-					}
-					php_stream_close(ret);
-					return NULL;
-				}
-
-				/* Make sure the fstat result is reused when we later try to get the
-				 * file size. */
-				self->no_forced_fstat = 1;
-			}
-
 			if (options & STREAM_USE_BLOCKING_PIPE) {
 				php_stdio_stream_data *self = (php_stdio_stream_data*)ret->abstract;
 				self->is_pipe_blocking = 1;