--- /dev/null
+/* prog_gnu_dynlinker.c -- check that RTLD_NEXT is defined as in GNU linker */
+/* Copyright (c) 2012. The SimGrid Team. All rights reserved. */
+
+/* This program is free software; you can redistribute it and/or modify it
+ * under the terms of the license (GNU LGPL) which comes with this package. */
+
+#define _GNU_SOURCE 1
+#include <dlfcn.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+static void * (*real_malloc) (size_t);
+
+int main(void) {
+ char *error;
+ dlerror(); // clear any previous error
+ real_malloc = (void * (*) (size_t)) dlsym(RTLD_NEXT, "malloc");
+ error = dlerror();
+ if (!error && real_malloc) {
+ char *A = real_malloc(20);
+ strcpy(A,"epic success");
+ free(A);
+ return 0; // SUCCESS
+ } else {
+ if (error)
+ printf("Error while checking for dlsym: %s\n",error);
+ else
+ printf("dlsym did not return any error, but failed to find malloc()\n",error);
+ return 1; // FAILED
+ }
+}