#include <fcntl.h> #include <stdlib.h> #include <stdio.h> #include <dlfcn.h> #include <stdint.h> int main(int argc, char **argv) { int ret = EXIT_SUCCESS; void *handle; void (*mydltest)(void *value1, void *value2); char *error; uint32_t *value1, *value2; handle = dlopen (LIBNAME, RTLD_LAZY); if (!handle) { fprintf(stderr, "Could not open ./%s: %s\n", LIBNAME, dlerror()); exit(1); } mydltest = dlsym(handle, "dltest"); if ((error = dlerror()) != NULL) { fprintf(stderr, "Could not locate symbol 'dltest': %s\n", error); exit(1); } mydltest(&value1, &value2); printf("dltest: __pthread_once=%p\n", value1); printf("dltest: pthread_self=%p\n", value2); if (value1 == value2) { ret = EXIT_FAILURE; printf("dltest: values should NOT be equal Weak values resolved incorrectly!\n"); } else { printf("dltest: weak symbols resoved correctly.\n"); } dlclose(handle); return ret; }