static Eterm notify_when_unloaded(Process *p, Eterm name_term, char *name, ErtsProcLocks plocks, Uint flag)
{
Eterm r = NIL;
Eterm immediate_tag = NIL;
Eterm immediate_type = NIL;
erts_driver_t *drv;
ERTS_LC_ASSERT(ERTS_PROC_LOCK_MAIN & plocks);
lock_drv_list();
if ((drv = lookup_driver(name)) == NULL) {
immediate_tag = am_unloaded;
immediate_type = am_DOWN;
goto immediate;
}
if (drv->handle == NULL || drv->handle->status == ERL_DE_PERMANENT) {
immediate_tag = am_permanent;
immediate_type = am_UP;
goto immediate;
}
p->flags |= F_USING_DDLL;
r = add_monitor(p, drv->handle, flag);
unlock_drv_list();
BIF_RET(r);
immediate:
r = erts_make_ref(p);
erts_proc_unlock(p, plocks);
notify_proc(p, r, name_term, immediate_type, immediate_tag, 0);
unlock_drv_list();
erts_proc_lock(p, plocks);
BIF_RET(r);
}
/*
* Utilities
*/
static Eterm notify_when_loaded(Process *p, Eterm name_term, char *name, ErtsProcLocks plocks)
{
Eterm r = NIL;
Eterm immediate_tag = NIL;
Eterm immediate_type = NIL;
erts_driver_t *drv;
ERTS_LC_ASSERT(ERTS_PROC_LOCK_MAIN & plocks);
lock_drv_list();
if ((drv = lookup_driver(name)) == NULL) {
immediate_tag = am_unloaded;
immediate_type = am_DOWN;
goto immediate;
}
if (drv->handle == NULL || drv->handle->status == ERL_DE_PERMANENT) {
immediate_tag = am_permanent;
immediate_type = am_UP;
goto immediate;
}
switch (drv->handle->status) {
case ERL_DE_OK:
immediate_tag = am_loaded;
immediate_type = am_UP;
goto immediate;
case ERL_DE_UNLOAD:
case ERL_DE_FORCE_UNLOAD:
immediate_tag = am_load_cancelled;
immediate_type = am_DOWN;
goto immediate;
case ERL_DE_RELOAD:
case ERL_DE_FORCE_RELOAD:
break;
default:
erts_exit(ERTS_ERROR_EXIT,"Internal error, unknown state %u in dynamic driver.", drv->handle->status);
}
p->flags |= F_USING_DDLL;
r = add_monitor(p, drv->handle, ERL_DE_PROC_AWAIT_LOAD);
unlock_drv_list();
BIF_RET(r);
immediate:
r = erts_make_ref(p);
erts_proc_unlock(p, plocks);
notify_proc(p, r, name_term, immediate_type, immediate_tag, 0);
unlock_drv_list();
erts_proc_lock(p, plocks);
BIF_RET(r);
}
struct OutputDriver* output_open(const char* driver_name,
const char* server_name)
{
struct output_id id;
slist_iterator_t it ;
struct output_descriptor* od = 0;
id.driver_name = (char*) driver_name;
id.server_name = (char*) server_name;
it = slist_find_if(s_outputs, id_equals, &id);
if (it == slist_end(s_outputs))
{
/* char buffer[TEMP_BUF_SIZE];
snprintf(buffer, sizeof(buffer),
"Creating new output descriptor: '%s:%s'",
driver_name, server_name);
s_log(2, buffer);*/
od = output_descriptor_create(driver_name, server_name);
slist_push_front(s_outputs, od);
}
else
{
od = (struct output_descriptor*) slist_iter_deref(it);
}
assert(od->ref_count >= 0);
// create drv if necessary
if (od->ref_count == 0)
{
od->drv = lookup_driver(driver_name);
}
// increase refcount
if (od->drv != 0)
{
++od->ref_count;
}
return od->drv;
}
/*
* More detailed info about loaded drivers:
* item is processes, driver_options, port_count, linked_in_driver,
* permanent, awaiting_load, awaiting_unload
*/
BIF_RETTYPE erl_ddll_info_2(BIF_ALIST_2)
{
Process *p = BIF_P;
Eterm name_term = BIF_ARG_1;
Eterm item = BIF_ARG_2;
char *name = NULL;
Eterm res = NIL;
erts_driver_t *drv;
ProcEntryInfo *pei = NULL;
int num_pei;
Eterm *hp;
int i;
Uint filter;
int have_lock = 0;
if ((name = pick_list_or_atom(name_term)) == NULL) {
goto error;
}
if (!is_atom(item)) {
goto error;
}
lock_drv_list();
have_lock = 1;
if ((drv = lookup_driver(name)) == NULL) {
goto error;
}
switch (item) {
case am_processes:
filter = ERL_DE_PROC_LOADED;
break;
case am_driver_options:
if (drv->handle == NULL) {
res = am_linked_in_driver;
} else {
Uint start_flags = drv->handle->flags & ERL_FL_CONSISTENT_MASK;
/* Cheating, only one flag for now... */
if (start_flags & ERL_DE_FL_KILL_PORTS) {
Eterm *myhp;
myhp = HAlloc(p,2);
res = CONS(myhp,am_kill_ports,NIL);
} else {
res = NIL;
}
}
goto done;
case am_port_count:
if (drv->handle == NULL) {
res = am_linked_in_driver;
} else if (drv->handle->status == ERL_DE_PERMANENT) {
res = am_permanent;
} else {
res = make_small(erts_atomic32_read_nob(&drv->handle->port_count));
}
goto done;
case am_linked_in_driver:
if (drv->handle == NULL){
res = am_true;
} else {
res = am_false;
}
goto done;
case am_permanent:
if (drv->handle != NULL && drv->handle->status == ERL_DE_PERMANENT) {
res = am_true;
} else {
res = am_false;
}
goto done;
case am_awaiting_load:
filter = ERL_DE_PROC_AWAIT_LOAD;
break;
case am_awaiting_unload:
filter = ERL_DE_PROC_AWAIT_UNLOAD;
break;
default:
goto error;
}
if (drv->handle == NULL) {
res = am_linked_in_driver;
goto done;
} else if (drv->handle->status == ERL_DE_PERMANENT) {
res = am_permanent;
goto done;
}
num_pei = build_proc_info(drv->handle, &pei, filter);
if (!num_pei) {
goto done;
}
hp = HAlloc(p,num_pei * (2+3));
for (i = 0; i < num_pei; ++ i) {
Eterm tpl = TUPLE2(hp,pei[i].pid,make_small(pei[i].count));
hp += 3;
res = CONS(hp,tpl,res);
hp += 2;
}
done:
unlock_drv_list();
if (pei)
erts_free(ERTS_ALC_T_DDLL_TMP_BUF, pei);
erts_free(ERTS_ALC_T_DDLL_TMP_BUF, (void *) name);
BIF_RET(res);
error:
if (name != NULL) {
erts_free(ERTS_ALC_T_DDLL_TMP_BUF, (void *) name);
}
if (have_lock) {
unlock_drv_list();
}
BIF_ERROR(p,BADARG);
}
/*
You have to have loaded the driver and the pid state
is LOADED or AWAIT_LOAD. You will be removed from the list
regardless of driver state.
If the driver is loaded by someone else to, return is
{ok, pending_process}
If the driver is loaded but locked by a port, return is
{ok, pending_driver}
If the driver is loaded and free to unload (you're the last holding it)
{ok, unloaded}
If it's not loaded or not loaded by you
{error, not_loaded} or {error, not_loaded_by_you}
Internally, if its in state UNLOADING, just return {ok, pending_driver} and
remove/decrement this pid (which should be an LOADED tagged one).
If the state is RELOADING, this pid should be in list as LOADED tagged,
only AWAIT_LOAD would be possible but not allowed for unloading, remove it
and, if the last LOADED tagged, change from RELOAD to UNLOAD and notify
any AWAIT_LOAD-waiters with {'DOWN', ref(), driver, name(), load_cancelled}
If the driver made itself permanent, {'UP', ref(), driver, name(), permanent}
*/
Eterm erl_ddll_try_unload_2(BIF_ALIST_2)
{
Eterm name_term = BIF_ARG_1;
Eterm options = BIF_ARG_2;
char *name = NULL;
Eterm ok_term = NIL;
Eterm soft_error_term = NIL;
erts_driver_t *drv;
DE_Handle *dh;
DE_ProcEntry *pe;
Eterm *hp;
Eterm t;
int monitor = 0;
Eterm l;
int kill_ports = 0;
erts_proc_unlock(BIF_P, ERTS_PROC_LOCK_MAIN);
for(l = options; is_list(l); l = CDR(list_val(l))) {
Eterm opt = CAR(list_val(l));
Eterm *tp;
if (is_not_tuple(opt)) {
if (opt == am_kill_ports) {
kill_ports = 1;
continue;
} else {
goto error;
}
}
tp = tuple_val(opt);
if (*tp != make_arityval(2) || tp[1] != am_monitor) {
goto error;
}
if (tp[2] == am_pending_driver) {
monitor = 1;
} else if (tp[2] == am_pending) {
monitor = 2;
} else {
goto error;
}
}
if (is_not_nil(l)) {
goto error;
}
if ((name = pick_list_or_atom(name_term)) == NULL) {
goto error;
}
lock_drv_list();
if ((drv = lookup_driver(name)) == NULL) {
soft_error_term = am_not_loaded;
goto soft_error;
}
if (drv->handle == NULL) {
soft_error_term = am_linked_in_driver;
goto soft_error;
} else if (drv->handle->status == ERL_DE_PERMANENT) {
soft_error_term = am_permanent;
goto soft_error;
}
dh = drv->handle;
if (dh->flags & ERL_DE_FL_KILL_PORTS) {
kill_ports = 1;
}
if ((pe = find_proc_entry(dh, BIF_P, ERL_DE_PROC_LOADED)) == NULL) {
if (num_procs(dh, ERL_DE_PROC_LOADED) > 0) {
soft_error_term = am_not_loaded_by_this_process;
goto soft_error;
}
} else {
remove_proc_entry(dh, pe);
if (!(pe->flags & ERL_DE_FL_DEREFERENCED)) {
erts_ddll_dereference_driver(dh);
}
erts_free(ERTS_ALC_T_DDLL_PROCESS, pe);
}
if (num_procs(dh, ERL_DE_PROC_LOADED) > 0) {
ok_term = am_pending_process;
--monitor;
goto done;
}
if (dh->status == ERL_DE_RELOAD ||
dh->status == ERL_DE_FORCE_RELOAD) {
notify_all(dh, drv->name,
ERL_DE_PROC_AWAIT_LOAD, am_DOWN, am_load_cancelled);
erts_free(ERTS_ALC_T_DDLL_HANDLE,dh->reload_full_path);
erts_free(ERTS_ALC_T_DDLL_HANDLE,dh->reload_driver_name);
dh->reload_full_path = dh->reload_driver_name = NULL;
dh->reload_flags = 0;
}
if (erts_atomic32_read_nob(&dh->port_count) > 0) {
++kill_ports;
}
dh->status = ERL_DE_UNLOAD;
ok_term = am_pending_driver;
done:
assert_drv_list_rwlocked();
if (kill_ports > 1) {
/* Avoid closing the driver by referencing it */
erts_ddll_reference_driver(dh);
dh->status = ERL_DE_FORCE_UNLOAD;
unlock_drv_list();
kill_ports_driver_unloaded(dh);
lock_drv_list();
erts_ddll_dereference_driver(dh);
}
erts_ddll_reference_driver(dh);
unlock_drv_list();
erts_proc_lock(BIF_P, ERTS_PROC_LOCK_MAIN);
lock_drv_list();
erts_ddll_dereference_driver(dh);
erts_free(ERTS_ALC_T_DDLL_TMP_BUF, (void *) name);
BIF_P->flags |= F_USING_DDLL;
if (monitor > 0) {
Eterm mref = add_monitor(BIF_P, dh, ERL_DE_PROC_AWAIT_UNLOAD);
hp = HAlloc(BIF_P, 4);
t = TUPLE3(hp, am_ok, ok_term, mref);
} else {
hp = HAlloc(BIF_P, 3);
t = TUPLE2(hp, am_ok, ok_term);
}
if (kill_ports > 1) {
ERTS_BIF_CHK_EXITED(BIF_P); /* May be exited by port killing */
}
unlock_drv_list();
BIF_RET(t);
soft_error:
unlock_drv_list();
erts_free(ERTS_ALC_T_DDLL_TMP_BUF, (void *) name);
erts_proc_lock(BIF_P, ERTS_PROC_LOCK_MAIN);
hp = HAlloc(BIF_P, 3);
t = TUPLE2(hp, am_error, soft_error_term);
BIF_RET(t);
error: /* No lock fiddling before going here */
assert_drv_list_not_locked();
if (name != NULL) {
erts_free(ERTS_ALC_T_DDLL_TMP_BUF, (void *) name);
}
erts_proc_lock(BIF_P, ERTS_PROC_LOCK_MAIN);
BIF_ERROR(BIF_P, BADARG);
}
/*
* Try to load. If the driver is OK, add as LOADED. If the driver is
* UNLOAD, possibly change to reload and add as LOADED,
* there should be no other
* LOADED tagged pid's. If the driver is RELOAD then add/increment as
* LOADED (should be some LOADED pid). If the driver is not present,
* really load and add as LOADED {ok,loaded} {ok,pending_driver}
* {error, permanent} {error,load_error()}
*/
BIF_RETTYPE erl_ddll_try_load_3(BIF_ALIST_3)
{
Eterm path_term = BIF_ARG_1;
Eterm name_term = BIF_ARG_2;
Eterm options = BIF_ARG_3;
char *path = NULL;
Sint path_len;
char *name = NULL;
DE_Handle *dh;
erts_driver_t *drv;
int res;
Eterm soft_error_term = NIL;
Eterm ok_term = NIL;
Eterm *hp;
Eterm t;
int monitor = 0;
int reload = 0;
Eterm l;
Uint flags = 0;
int kill_ports = 0;
int do_build_load_error = 0;
int build_this_load_error = 0;
int encoding;
for(l = options; is_list(l); l = CDR(list_val(l))) {
Eterm opt = CAR(list_val(l));
Eterm *tp;
if (is_not_tuple(opt)) {
goto error;
}
tp = tuple_val(opt);
if (*tp != make_arityval(2) || is_not_atom(tp[1])) {
goto error;
}
switch (tp[1]) {
case am_driver_options:
{
Eterm ll;
for(ll = tp[2]; is_list(ll); ll = CDR(list_val(ll))) {
Eterm dopt = CAR(list_val(ll));
if (dopt == am_kill_ports) {
flags |= ERL_DE_FL_KILL_PORTS;
} else {
goto error;
}
}
if (is_not_nil(ll)) {
goto error;
}
}
break;
case am_monitor:
if (tp[2] == am_pending_driver) {
monitor = 1;
} else if (tp[2] == am_pending ) {
monitor = 2;
} else {
goto error;
}
break;
case am_reload:
if (tp[2] == am_pending_driver) {
reload = 1;
} else if (tp[2] == am_pending ) {
reload = 2;
} else {
goto error;
}
break;
default:
goto error;
}
}
if (is_not_nil(l)) {
goto error;
}
if ((name = pick_list_or_atom(name_term)) == NULL) {
goto error;
}
encoding = erts_get_native_filename_encoding();
if (encoding == ERL_FILENAME_WIN_WCHAR) {
/* Do not convert the lib name to utf-16le yet, do that in win32 specific code */
/* since lib_name is used in error messages */
encoding = ERL_FILENAME_UTF8;
}
path = erts_convert_filename_to_encoding(path_term, NULL, 0,
ERTS_ALC_T_DDLL_TMP_BUF, 1, 0,
encoding, &path_len,
sys_strlen(name) + 2); /* might need path separator */
if (!path) {
goto error;
}
ASSERT(path_len > 0 && path[path_len-1] == 0);
while (--path_len > 0 && (path[path_len-1] == '\\' || path[path_len-1] == '/'))
;
path[path_len++] = '/';
sys_strcpy(path+path_len,name);
erts_proc_unlock(BIF_P, ERTS_PROC_LOCK_MAIN);
lock_drv_list();
if ((drv = lookup_driver(name)) != NULL) {
if (drv->handle == NULL) {
/* static_driver */
soft_error_term = am_linked_in_driver;
goto soft_error;
} else {
dh = drv->handle;
if (dh->status == ERL_DE_OK) {
int is_last = is_last_user(dh, BIF_P);
if (reload == 1 && !is_last) {
/*Want reload if no other users,
but there are others...*/
soft_error_term = am_pending_process;
goto soft_error;
}
if (reload != 0) {
DE_ProcEntry *old;
if ((dh->flags & ERL_FL_CONSISTENT_MASK) !=
(flags & ERL_FL_CONSISTENT_MASK)) {
soft_error_term = am_inconsistent;
goto soft_error;
}
if ((old = find_proc_entry(dh, BIF_P,
ERL_DE_PROC_LOADED)) ==
NULL) {
soft_error_term = am_not_loaded_by_this_process;
goto soft_error;
} else {
remove_proc_entry(dh, old);
erts_ddll_dereference_driver(dh);
erts_free(ERTS_ALC_T_DDLL_PROCESS, old);
}
/* Reload requested and granted */
dereference_all_processes(dh);
set_driver_reloading(dh, BIF_P, path, name, flags);
if (dh->flags & ERL_DE_FL_KILL_PORTS) {
kill_ports = 1;
}
ok_term = (reload == 1) ? am_pending_driver :
am_pending_process;
} else {
/* Already loaded and healthy (might be by me) */
if (sys_strcmp(dh->full_path, path) ||
(dh->flags & ERL_FL_CONSISTENT_MASK) !=
(flags & ERL_FL_CONSISTENT_MASK)) {
soft_error_term = am_inconsistent;
goto soft_error;
}
add_proc_loaded(dh, BIF_P);
erts_ddll_reference_driver(dh);
monitor = 0;
ok_term = mkatom("already_loaded");
}
} else if (dh->status == ERL_DE_UNLOAD ||
dh->status == ERL_DE_FORCE_UNLOAD) {
/* pending driver */
if (reload != 0) {
soft_error_term = am_not_loaded_by_this_process;
goto soft_error;
}
if (sys_strcmp(dh->full_path, path) ||
(dh->flags & ERL_FL_CONSISTENT_MASK) !=
(flags & ERL_FL_CONSISTENT_MASK)) {
soft_error_term = am_inconsistent;
goto soft_error;
}
dh->status = ERL_DE_OK;
notify_all(dh, drv->name,
ERL_DE_PROC_AWAIT_UNLOAD, am_UP,
am_unload_cancelled);
add_proc_loaded(dh, BIF_P);
erts_ddll_reference_driver(dh);
monitor = 0;
ok_term = mkatom("already_loaded");
} else if (dh->status == ERL_DE_RELOAD ||
dh->status == ERL_DE_FORCE_RELOAD) {
if (reload != 0) {
soft_error_term = am_pending_reload;
goto soft_error;
}
if (sys_strcmp(dh->reload_full_path, path) ||
(dh->reload_flags & ERL_FL_CONSISTENT_MASK) !=
(flags & ERL_FL_CONSISTENT_MASK)) {
soft_error_term = am_inconsistent;
goto soft_error;
}
/* Load of granted unload... */
/* Don't reference, will happen after reload */
add_proc_loaded_deref(dh, BIF_P);
++monitor;
ok_term = am_pending_driver;
} else { /* ERL_DE_PERMANENT */
soft_error_term = am_permanent;
goto soft_error;
}
}
} else { /* driver non-existing */
if (reload != 0) {
soft_error_term = am_not_loaded;
goto soft_error;
}
if ((res = load_driver_entry(&dh, path, name)) != ERL_DE_NO_ERROR) {
build_this_load_error = res;
do_build_load_error = 1;
soft_error_term = am_undefined;
goto soft_error;
} else {
dh->flags = flags;
add_proc_loaded(dh, BIF_P);
first_ddll_reference(dh);
monitor = 0;
ok_term = mkatom("loaded");
}
}
assert_drv_list_rwlocked();
if (kill_ports) {
/* Avoid closing the driver by referencing it */
erts_ddll_reference_driver(dh);
ASSERT(dh->status == ERL_DE_RELOAD);
dh->status = ERL_DE_FORCE_RELOAD;
unlock_drv_list();
kill_ports_driver_unloaded(dh);
/* Dereference, eventually causing driver destruction */
lock_drv_list();
erts_ddll_dereference_driver(dh);
}
erts_ddll_reference_driver(dh);
unlock_drv_list();
erts_proc_lock(BIF_P, ERTS_PROC_LOCK_MAIN);
lock_drv_list();
erts_ddll_dereference_driver(dh);
BIF_P->flags |= F_USING_DDLL;
if (monitor) {
Eterm mref = add_monitor(BIF_P, dh, ERL_DE_PROC_AWAIT_LOAD);
hp = HAlloc(BIF_P, 4);
t = TUPLE3(hp, am_ok, ok_term, mref);
} else {
hp = HAlloc(BIF_P, 3);
t = TUPLE2(hp, am_ok, ok_term);
}
unlock_drv_list();
erts_free(ERTS_ALC_T_DDLL_TMP_BUF, (void *) path);
erts_free(ERTS_ALC_T_DDLL_TMP_BUF, (void *) name);
ERTS_LC_ASSERT(ERTS_PROC_LOCK_MAIN & erts_proc_lc_my_proc_locks(BIF_P));
BIF_RET(t);
soft_error:
unlock_drv_list();
erts_proc_lock(BIF_P, ERTS_PROC_LOCK_MAIN);
if (do_build_load_error) {
soft_error_term = build_load_error(BIF_P, build_this_load_error);
}
hp = HAlloc(BIF_P, 3);
t = TUPLE2(hp, am_error, soft_error_term);
erts_free(ERTS_ALC_T_DDLL_TMP_BUF, (void *) path);
erts_free(ERTS_ALC_T_DDLL_TMP_BUF, (void *) name);
ERTS_LC_ASSERT(ERTS_PROC_LOCK_MAIN & erts_proc_lc_my_proc_locks(BIF_P));
BIF_RET(t);
error:
assert_drv_list_not_locked();
ERTS_LC_ASSERT(ERTS_PROC_LOCK_MAIN & erts_proc_lc_my_proc_locks(BIF_P));
if (path != NULL) {
erts_free(ERTS_ALC_T_DDLL_TMP_BUF, (void *) path);
}
if (name != NULL) {
erts_free(ERTS_ALC_T_DDLL_TMP_BUF, (void *) name);
}
BIF_ERROR(BIF_P, BADARG);
}
