com php-src: improve/fix error handling: ext/opcache/shared_a lloc_win32.c

Commit:    ca543ff01c9e182eadc344aec8746ba19187a2b1
Author:    Anatol Belski <[email protected]>         Sat, 15 Apr 2017 19:30:30 +0200
Parents:   9719621e078e41aa2d387cea4d4b1dd956c9e1e2
Branches:  PHP-7.0 PHP-7.1 master

Link:       http://git.php.net/?p=php-src.git;a=commitdiff;h=ca543ff01c9e182eadc344aec8746ba19187a2b1

Log:
improve/fix error handling

GetLastError() should not be called, if the function didn't fail.

Changed paths:
  M  ext/opcache/shared_alloc_win32.c


Diff:
diff --git a/ext/opcache/shared_alloc_win32.c b/ext/opcache/shared_alloc_win32.c
index d05f01c..2701b41 100644
--- a/ext/opcache/shared_alloc_win32.c
+++ b/ext/opcache/shared_alloc_win32.c
@@ -134,8 +134,8 @@ static int zend_shared_alloc_reattach(size_t requested_size, char **error_in)
 	FILE *fp = fopen(mmap_base_file, "r");
 	MEMORY_BASIC_INFORMATION info;
 
-	err = GetLastError();
 	if (!fp) {
+		err = GetLastError();
 		zend_win_error_message(ACCEL_LOG_WARNING, mmap_base_file, err);
 		zend_win_error_message(ACCEL_LOG_FATAL, "Unable to open base address file", err);
 		*error_in="fopen";
@@ -184,9 +184,9 @@ static int zend_shared_alloc_reattach(size_t requested_size, char **error_in)
    	}
 
 	mapping_base = MapViewOfFileEx(memfile, FILE_MAP_ALL_ACCESS, 0, 0, 0, wanted_mapping_base);
-	err = GetLastError();
 
 	if (mapping_base == NULL) {
+		err = GetLastError();
 		if (err == ERROR_INVALID_ADDRESS) {
 			zend_win_error_message(ACCEL_LOG_FATAL, "Unable to reattach to base address", err);
 			return ALLOC_FAILURE;
@@ -200,7 +200,7 @@ static int zend_shared_alloc_reattach(size_t requested_size, char **error_in)
 
 static int create_segments(size_t requested_size, zend_shared_segment ***shared_segments_p, int *shared_segments_count, char **error_in)
 {
-	int err, ret;
+	int err = 0, ret;
 	zend_shared_segment *shared_segment;
 	int map_retries = 0;
 	void *default_mapping_base_set[] = { 0, 0 };
@@ -222,14 +222,14 @@ static int create_segments(size_t requested_size, zend_shared_segment ***shared_
 	   and we have to sleep some time (until the child releases the mapping object) and retry.*/
 	do {
 		memfile = OpenFileMapping(FILE_MAP_WRITE, 0, create_name_with_username(ACCEL_FILEMAP_NAME));
-		err = GetLastError();
 		if (memfile == NULL) {
+			err = GetLastError();
 			break;
 		}
 
 		ret =  zend_shared_alloc_reattach(requested_size, error_in);
-		err = GetLastError();
 		if (ret == ALLOC_FAIL_MAPPING) {
+			err = GetLastError();
 			/* Mapping failed, wait for mapping object to get freed and retry */
 			CloseHandle(memfile);
 			memfile = NULL;
@@ -256,8 +256,9 @@ static int create_segments(size_t requested_size, zend_shared_segment ***shared_
 	*shared_segments_count = 1;
 	*shared_segments_p = (zend_shared_segment **) calloc(1, sizeof(zend_shared_segment)+sizeof(void *));
 	if (!*shared_segments_p) {
+		err = GetLastError();
 		zend_shared_alloc_unlock_win32();
-		zend_win_error_message(ACCEL_LOG_FATAL, "calloc() failed", GetLastError());
+		zend_win_error_message(ACCEL_LOG_FATAL, "calloc() failed", err);
 		*error_in = "calloc";
 		return ALLOC_FAILURE;
 	}
@@ -266,8 +267,8 @@ static int create_segments(size_t requested_size, zend_shared_segment ***shared_
 
 	memfile	= CreateFileMapping(INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE, 0, requested_size,
 								create_name_with_username(ACCEL_FILEMAP_NAME));
-	err = GetLastError();
 	if (memfile == NULL) {
+		err = GetLastError();
 		zend_shared_alloc_unlock_win32();
 		zend_win_error_message(ACCEL_LOG_FATAL, "Unable to create file mapping", err);
 		*error_in = "CreateFileMapping";
@@ -301,8 +302,8 @@ static int create_segments(size_t requested_size, zend_shared_segment ***shared_
 		wanted_mapping_base++;
 	} while (!mapping_base);
 
-	err = GetLastError();
 	if (mapping_base == NULL) {
+		err = GetLastError();
 		zend_shared_alloc_unlock_win32();
 		zend_win_error_message(ACCEL_LOG_FATAL, "Unable to create view for file mapping", err);
 		*error_in = "MapViewOfFile";
@@ -310,8 +311,8 @@ static int create_segments(size_t requested_size, zend_shared_segment ***shared_
 	} else {
 		char *mmap_base_file = get_mmap_base_file();
 		FILE *fp = fopen(mmap_base_file, "w");
-		err = GetLastError();
 		if (!fp) {
+			err = GetLastError();
 			zend_shared_alloc_unlock_win32();
 			zend_win_error_message(ACCEL_LOG_WARNING, mmap_base_file, err);
 			zend_win_error_message(ACCEL_LOG_FATAL, "Unable to write base address", err);