LIB_PRIVATE
void *_real_dlsym (void *handle, const char *symbol) {
static dlsym_fnptr_t _libc_dlsym_fnptr = NULL;
if (_libc_dlsym_fnptr == NULL) {
_libc_dlsym_fnptr = _dmtcp_get_libc_dlsym_addr();
}
// Avoid calling WRAPPER_EXECUTION_DISABLE_CKPT() in calloc() wrapper. See
// comment in miscwrappers for more details.
dmtcp_setThreadPerformingDlopenDlsym();
void *res = (*_libc_dlsym_fnptr) (handle, symbol);
dmtcp_unsetThreadPerformingDlopenDlsym();
return res;
}
/*
* WARNING: By using this method to initialize libpthread wrappers (direct
* dlopen()/dlsym()) we are are overriding any user wrappers for these
* functions. If this is a problem in the future we need to think of a new way
* to do this.
*/
LIB_PRIVATE
void initialize_libpthread_wrappers()
{
if (!_libpthread_wrappers_initialized) {
dmtcp_setThreadPerformingDlopenDlsym();
void *pthread_handle = _real_dlopen(LIBPTHREAD_FILENAME, RTLD_NOW);
dmtcp_unsetThreadPerformingDlopenDlsym();
if (pthread_handle == NULL) {
fprintf(stderr, "*** DMTCP: Error: could not open libpthread shared "
"library. Aborting.\n");
abort();
}
FOREACH_LIBPTHREAD_WRAPPERS(GET_LIBPTHREAD_FUNC_ADDR);
_real_dlclose(pthread_handle);
_libpthread_wrappers_initialized = 1;
}
}
LIB_PRIVATE
void *_real_dlsym (void *handle, const char *symbol) {
static dlsym_fnptr_t _libc_dlsym_fnptr = NULL;
if (_libc_dlsym_fnptr == NULL) {
_libc_dlsym_fnptr = dmtcp_get_libc_dlsym_addr();
}
#if TRACK_DLOPEN_DLSYM_FOR_LOCKS
// Avoid calling WRAPPER_EXECUTION_DISABLE_CKPT() in calloc() wrapper. See
// comment in miscwrappers for more details.
// EDIT: Now that we are using pthread_getspecific trick, calloc will not be
// called and so we do not need to disable locking for calloc.
dmtcp_setThreadPerformingDlopenDlsym();
#endif
void *res = (*_libc_dlsym_fnptr) (handle, symbol);
#if TRACK_DLOPEN_DLSYM_FOR_LOCKS
dmtcp_unsetThreadPerformingDlopenDlsym();
#endif
return res;
}