fix: add debug messages when graph export fails

Related-To: NEO-15377
Signed-off-by: Naklicki, Mateusz <mateusz.naklicki@intel.com>

Author: luluu9

level_zero/core/test/unit_tests/experimental/test_graph_export.cpp

@@ -7,6 +7,7 @@
 
 #include "level_zero/core/test/unit_tests/experimental/test_graph_export.h"
 
+#include "shared/test/common/helpers/stream_capture.h"
 #include "shared/test/common/mocks/mock_io_functions.h"
 
 #include "level_zero/core/test/unit_tests/fixtures/module_fixture.h"
@@ -690,26 +691,46 @@ TEST_F(GraphDotExporterFileTest, GivenEmptyGraphWhenExportToFileThenWritesValidD
 }
 
 TEST_F(GraphDotExporterFileTest, GivenFailedFileOpenWhenExportToFileThenReturnsUnknownError) {
+    DebugManagerStateRestore restorer;
+    NEO::debugManager.flags.PrintDebugMessages.set(true);
+
     Graph testGraph{&ctx, true};
     setupFailedOpen();
 
+    StreamCapture capture;
+    capture.captureStderr();
+
     auto result = exporter.exportToFile(testGraph, testFilePath.c_str());
     EXPECT_EQ(ZE_RESULT_ERROR_UNKNOWN, result);
 
     EXPECT_EQ(mockFopenCalledBefore + 1, NEO::IoFunctions::mockFopenCalled);
     EXPECT_EQ(mockFwriteCalledBefore, NEO::IoFunctions::mockFwriteCalled);
+
+    auto errorMessage = capture.getCapturedStderr();
+    auto expectedErrorMessage = "Failed to open file " + testFilePath + " for writing graph content\n";
+    EXPECT_EQ(expectedErrorMessage, errorMessage);
 }
 
 TEST_F(GraphDotExporterFileTest, GivenFailedFileWriteWhenExportToFileThenReturnsUnknownError) {
+    DebugManagerStateRestore restorer;
+    NEO::debugManager.flags.PrintDebugMessages.set(true);
+
     Graph testGraph{&ctx, true};
     setupFailedWrite();
 
+    StreamCapture capture;
+    capture.captureStderr();
+
     auto result = exporter.exportToFile(testGraph, testFilePath.c_str());
     EXPECT_EQ(ZE_RESULT_ERROR_UNKNOWN, result);
 
     EXPECT_EQ(mockFopenCalledBefore + 1, NEO::IoFunctions::mockFopenCalled);
     EXPECT_EQ(mockFwriteCalledBefore + 1, NEO::IoFunctions::mockFwriteCalled);
     EXPECT_EQ(mockFcloseCalledBefore + 1, NEO::IoFunctions::mockFcloseCalled);
+
+    auto errorMessage = capture.getCapturedStderr();
+    auto expectedErrorMessage = "Failed to write graph content to file " + testFilePath + "\n";
+    EXPECT_EQ(expectedErrorMessage, errorMessage);
 }
 
 TEST(GraphDumpHelperTest, GivenNullptrAndPtrWhenFormatPointerIsCalledThenReturnsFormattedString) {

level_zero/experimental/source/graph/graph_export.cpp

@@ -33,14 +33,16 @@ ze_result_t GraphDotExporter::exportToFile(const Graph &graph, const char *fileP
 
     FILE *file = NEO::IoFunctions::fopenPtr(filePath, "w");
     if (nullptr == file) {
+        PRINT_DEBUG_STRING(NEO::debugManager.flags.PrintDebugMessages.get(), stderr, "Failed to open file %s for writing graph content\n", filePath);
         return ZE_RESULT_ERROR_UNKNOWN;
     }
 
     std::string dotContent = exportToString(graph);
-    size_t bytesWritten = NEO::IoFunctions::fwritePtr(dotContent.c_str(), 1, dotContent.size(), file);
+    size_t bytesWritten = NEO::IoFunctions::fwritePtr(dotContent.c_str(), sizeof(char), dotContent.size(), file);
     NEO::IoFunctions::fclosePtr(file);
 
     if (bytesWritten != dotContent.size()) {
+        PRINT_DEBUG_STRING(NEO::debugManager.flags.PrintDebugMessages.get(), stderr, "Failed to write graph content to file %s\n", filePath);
         return ZE_RESULT_ERROR_UNKNOWN;
     }