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_common.h

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

Author: ldorau

src/utils/utils_common.h

@@ -62,6 +62,10 @@ static inline int is_running_in_proxy_lib(void) {
 size_t util_get_page_size(void);
 char *util_strncpy(char *dest, size_t destSize, const char *src, size_t n);
 
+void *util_open_library(const char *filename);
+int util_close_library(void *handle);
+void *util_get_symbol_addr(void *handle, const char *symbol);
+
 #define NOFUNCTION                                                             \
     do {                                                                       \
     } while (0)

src/utils/utils_posix_common.c

@@ -7,6 +7,8 @@
  *
  */
 
+#include <dlfcn.h>
+#include <pthread.h>
 #include <stdlib.h>
 #include <string.h>
 #include <sys/syscall.h>
@@ -55,3 +57,13 @@ char *util_strncpy(char *dest, size_t destSize, const char *src, size_t n) {
     (void)destSize; // unused
     return strncpy(dest, src, n);
 }
+
+void *util_open_library(const char *filename) {
+    return dlopen(filename, RTLD_LAZY);
+}
+
+int util_close_library(void *handle) { return dlclose(handle); }
+
+void *util_get_symbol_addr(void *handle, const char *symbol) {
+    return dlsym(handle, symbol);
+}

src/utils/utils_windows_common.c

@@ -9,6 +9,7 @@
 
 #include <windows.h>
 
+#include <libloaderapi.h>
 #include <processenv.h>
 
 #include "utils_concurrency.h"
@@ -54,3 +55,17 @@ char *util_strncpy(char *dest, size_t destSize, const char *src, size_t n) {
 
     return dest;
 }
+
+void *util_open_library(const char *filename) {
+    return LoadLibrary(TEXT(filename));
+}
+
+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);
+}
+
+void *util_get_symbol_addr(void *handle, const char *symbol) {
+    return GetProcAddress(handle, symbol);
+}