Add util_open_library, util_close_library, util_get_symbol_addr

Add util_open_library(), util_close_library()
and util_get_symbol_addr() to utils_load_library.h

Including this header forces linking with libdl on Linux.

Signed-off-by: Lukasz Dorau <[email protected]>

Author: ldorau

src/utils/utils_load_library.h

@@ -0,0 +1,67 @@
+/*
+ *
+ * Copyright (C) 2024 Intel Corporation
+ *
+ * Under the Apache License v2.0 with LLVM Exceptions. See LICENSE.TXT.
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+ *
+ */
+
+/*
+ * Including this header forces linking with libdl on Linux.
+ */
+
+#ifndef UMF_LOAD_LIBRARY_H
+#define UMF_LOAD_LIBRARY_H 1
+
+#ifdef _WIN32 /* Windows */
+
+#include <windows.h>
+
+#include <libloaderapi.h>
+
+#else /* Linux */
+
+#include <dlfcn.h> // forces linking with libdl on Linux
+
+#endif /* _WIN32 */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifdef _WIN32 /* Windows */
+
+static inline void *util_open_library(const char *filename) {
+    return LoadLibrary(TEXT(filename));
+}
+
+static inline int util_close_library(void *handle) {
+    // If the FreeLibrary function succeeds, the return value is nonzero.
+    // If the FreeLibrary function fails, the return value is zero.
+    return (FreeLibrary(handle) == 0);
+}
+
+static inline void *util_get_symbol_addr(void *handle, const char *symbol) {
+    return GetProcAddress(handle, symbol);
+}
+
+#else /* Linux */
+
+static inline void *util_open_library(const char *filename) {
+    return dlopen(filename, RTLD_LAZY);
+}
+
+static inline int util_close_library(void *handle) { return dlclose(handle); }
+
+static inline void *util_get_symbol_addr(void *handle, const char *symbol) {
+    return dlsym(handle, symbol);
+}
+
+#endif /* _WIN32 */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* UMF_LOAD_LIBRARY_H */