Unix SMB/CIFS implementation.
module loading system
- Copyright (C) Jelmer Vernooij 2002
+ Copyright (C) Jelmer Vernooij 2002-2003
+ Copyright (C) Stefan (metze) Metzmacher 2003
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
#include "includes.h"
#ifdef HAVE_DLOPEN
-NTSTATUS smb_load_module(const char *module_name)
+
+/* Load a dynamic module. Only log a level 0 error if we are not checking
+ for the existence of a module (probling). */
+
+static NTSTATUS do_smb_load_module(const char *module_name, BOOL is_probe)
{
void *handle;
init_module_function *init;
- NTSTATUS nt_status;
+ NTSTATUS status;
+ const char *error;
/* Always try to use LAZY symbol resolving; if the plugin has
* backwards compatibility, there might be symbols in the
* plugin referencing to old (removed) functions
*/
- handle = dlopen(module_name, RTLD_LAZY);
+ handle = sys_dlopen(module_name, RTLD_LAZY);
+
+ /* This call should reset any possible non-fatal errors that
+ occured since last call to dl* functions */
+ error = sys_dlerror();
if(!handle) {
- DEBUG(0, ("Error loading module '%s': %s\n", module_name, sys_dlerror()));
+ int level = is_probe ? 3 : 0;
+ DEBUG(level, ("Error loading module '%s': %s\n", module_name, error ? error : ""));
return NT_STATUS_UNSUCCESSFUL;
}
- init = sys_dlsym(handle, "init_module");
+ init = (init_module_function *)sys_dlsym(handle, "init_module");
- if(!init) {
- DEBUG(0, ("Error trying to resolve symbol 'init_module' in %s: %s\n", module_name, sys_dlerror()));
+ /* we must check sys_dlerror() to determine if it worked, because
+ sys_dlsym() can validly return NULL */
+ error = sys_dlerror();
+ if (error) {
+ DEBUG(0, ("Error trying to resolve symbol 'init_module' in %s: %s\n",
+ module_name, error));
return NT_STATUS_UNSUCCESSFUL;
}
- nt_status = init();
+ status = init();
DEBUG(2, ("Module '%s' loaded\n", module_name));
- return nt_status;
+ return status;
+}
+
+NTSTATUS smb_load_module(const char *module_name)
+{
+ return do_smb_load_module(module_name, False);
+}
+
+/* Load all modules in list and return number of
+ * modules that has been successfully loaded */
+int smb_load_modules(const char **modules)
+{
+ int i;
+ int success = 0;
+
+ for(i = 0; modules[i]; i++){
+ if(NT_STATUS_IS_OK(smb_load_module(modules[i]))) {
+ success++;
+ }
+ }
+
+ DEBUG(2, ("%d modules successfully loaded\n", success));
+
+ return success;
+}
+
+NTSTATUS smb_probe_module(const char *subsystem, const char *module)
+{
+ pstring full_path;
+
+ /* Check for absolute path */
+
+ /* if we make any 'samba multibyte string'
+ calls here, we break
+ for loading string modules */
+
+ DEBUG(5, ("Probing module '%s'\n", module));
+
+ if (module[0] == '/')
+ return do_smb_load_module(module, True);
+
+ pstrcpy(full_path, lib_path(subsystem));
+ pstrcat(full_path, "/");
+ pstrcat(full_path, module);
+ pstrcat(full_path, ".");
+ pstrcat(full_path, shlib_ext());
+
+ DEBUG(5, ("Probing module '%s': Trying to load from %s\n", module, full_path));
+
+ return do_smb_load_module(full_path, True);
}
#else /* HAVE_DLOPEN */
NTSTATUS smb_load_module(const char *module_name)
{
- DEBUG(0,("This samba executable has not been build with plugin support"));
+ DEBUG(0,("This samba executable has not been built with plugin support\n"));
+ return NT_STATUS_NOT_SUPPORTED;
+}
+
+int smb_load_modules(const char **modules)
+{
+ DEBUG(0,("This samba executable has not been built with plugin support\n"));
+ return -1;
+}
+
+NTSTATUS smb_probe_module(const char *subsystem, const char *module)
+{
+ DEBUG(0,("This samba executable has not been built with plugin support, not probing\n"));
return NT_STATUS_NOT_SUPPORTED;
}
#endif /* HAVE_DLOPEN */
+
+void init_modules(void)
+{
+ /* FIXME: This can cause undefined symbol errors :
+ * smb_register_vfs() isn't available in nmbd, for example */
+ if(lp_preload_modules())
+ smb_load_modules(lp_preload_modules());
+}
+
+
+/***************************************************************************
+ * This Function registers a idle event
+ *
+ * the registered funtions are run periodically
+ * and maybe shutdown idle connections (e.g. to an LDAP server)
+ ***************************************************************************/
+static smb_event_id_t smb_idle_event_id = 1;
+
+struct smb_idle_list_ent {
+ struct smb_idle_list_ent *prev,*next;
+ smb_event_id_t id;
+ smb_idle_event_fn *fn;
+ void *data;
+ time_t interval;
+ time_t lastrun;
+};
+
+static struct smb_idle_list_ent *smb_idle_event_list = NULL;
+
+smb_event_id_t smb_register_idle_event(smb_idle_event_fn *fn, void *data, time_t interval)
+{
+ struct smb_idle_list_ent *event;
+
+ if (!fn) {
+ return SMB_EVENT_ID_INVALID;
+ }
+
+ event = SMB_MALLOC_P(struct smb_idle_list_ent);
+ if (!event) {
+ DEBUG(0,("malloc() failed!\n"));
+ return SMB_EVENT_ID_INVALID;
+ }
+ event->fn = fn;
+ event->data = data;
+ event->interval = interval;
+ event->lastrun = 0;
+ event->id = smb_idle_event_id++;
+
+ DLIST_ADD(smb_idle_event_list,event);
+
+ return event->id;
+}
+
+BOOL smb_unregister_idle_event(smb_event_id_t id)
+{
+ struct smb_idle_list_ent *event = smb_idle_event_list;
+
+ while(event) {
+ if (event->id == id) {
+ DLIST_REMOVE(smb_idle_event_list,event);
+ SAFE_FREE(event);
+ return True;
+ }
+ event = event->next;
+ }
+
+ return False;
+}
+
+void smb_run_idle_events(time_t now)
+{
+ struct smb_idle_list_ent *event = smb_idle_event_list;
+
+ while (event) {
+ struct smb_idle_list_ent *next = event->next;
+ time_t interval;
+
+ if (event->interval <= 0) {
+ interval = SMB_IDLE_EVENT_DEFAULT_INTERVAL;
+ } else if (event->interval >= SMB_IDLE_EVENT_MIN_INTERVAL) {
+ interval = event->interval;
+ } else {
+ interval = SMB_IDLE_EVENT_MIN_INTERVAL;
+ }
+ if (now >(event->lastrun+interval)) {
+ event->lastrun = now;
+ event->fn(&event->data,&event->interval,now);
+ }
+ event = next;
+ }
+
+ return;
+}
+
+/***************************************************************************
+ * This Function registers a exit event
+ *
+ * the registered functions are run on exit()
+ * and maybe shutdown idle connections (e.g. to an LDAP server)
+ ***************************************************************************/
+
+struct smb_exit_list_ent {
+ struct smb_exit_list_ent *prev,*next;
+ smb_event_id_t id;
+ smb_exit_event_fn *fn;
+ void *data;
+};
+
+static struct smb_exit_list_ent *smb_exit_event_list = NULL;
+
+smb_event_id_t smb_register_exit_event(smb_exit_event_fn *fn, void *data)
+{
+ struct smb_exit_list_ent *event;
+ static smb_event_id_t smb_exit_event_id = 1;
+
+ if (!fn) {
+ return SMB_EVENT_ID_INVALID;
+ }
+
+ event = SMB_MALLOC_P(struct smb_exit_list_ent);
+ if (!event) {
+ DEBUG(0,("malloc() failed!\n"));
+ return SMB_EVENT_ID_INVALID;
+ }
+ event->fn = fn;
+ event->data = data;
+ event->id = smb_exit_event_id++;
+
+ DLIST_ADD(smb_exit_event_list,event);
+
+ return event->id;
+}
+
+BOOL smb_unregister_exit_event(smb_event_id_t id)
+{
+ struct smb_exit_list_ent *event = smb_exit_event_list;
+
+ while(event) {
+ if (event->id == id) {
+ DLIST_REMOVE(smb_exit_event_list,event);
+ SAFE_FREE(event);
+ return True;
+ }
+ event = event->next;
+ }
+
+ return False;
+}
+
+void smb_run_exit_events(void)
+{
+ struct smb_exit_list_ent *event = smb_exit_event_list;
+ struct smb_exit_list_ent *tmp = NULL;
+
+ while (event) {
+ event->fn(&event->data);
+ tmp = event;
+ event = event->next;
+ /* exit event should only run one time :-)*/
+ SAFE_FREE(tmp);
+ }
+
+ /* the list is empty now...*/
+ smb_exit_event_list = NULL;
+
+ return;
+}
git.samba.org / tprouty / samba.git / blobdiff