void _stack_items_free(char **in_string, int in_count)
{
if (!in_string) return;
for (int i = 0; i < in_count; i++)
if (in_string[i]) _stack_free(in_string[i]);
_stack_free(in_string);
}
SerBuff* serbuff_create(Stack *in_stack, void *in_data, long in_size, int in_nocopy)
{
assert(IS_STACK(in_stack));
assert(IS_BOOL(in_nocopy));
SerBuff *buff = _stack_malloc(sizeof(struct SerBuff));
if (!buff) return _stack_panic_null(in_stack, STACK_ERR_MEMORY);
buff->stack = in_stack;
buff->readonly = 0;
if (in_nocopy)
{
buff->data = in_data;
buff->size = in_size;
buff->alloc = in_size;
buff->readonly = 1;
}
else
{
buff->data = _stack_malloc(in_size);
if (!buff->data)
{
_stack_free(buff);
return _stack_panic_null(in_stack, STACK_ERR_MEMORY);
}
buff->size = in_size;
buff->alloc = in_size;
memcpy(buff->data, in_data, in_size);
}
buff->read_offset = 0;
return buff;
}
void _undo_stack_destroy(Stack *in_stack)
{
if (!in_stack->undo_stack) return;
stack_undo_flush(in_stack);
if (in_stack->undo_stack) _stack_free(in_stack->undo_stack);
}
static void _undo_stack_frame_clear(Stack *in_stack, int in_frame_index)
{
assert(in_stack->undo_stack != NULL);
struct UndoFrame *frame = in_stack->undo_stack + in_frame_index;
if (frame->description) _stack_free(frame->description);
frame->description = NULL;
for (int i = 0; i < frame->step_count; i++)
{
struct UndoStep *step = frame->steps + i;
if (step->data) serbuff_destroy(step->data, 1);
}
if (frame->steps) _stack_free(frame->steps);
frame->steps = NULL;
frame->step_count = 0;
}
static void _undo_process_frame(Stack *in_stack, struct UndoFrame *in_frame)
{
assert(in_stack->undo_stack != NULL);
struct UndoFrame saved_frame;
/* save the frame */
saved_frame = *in_frame;
/* reset the input frame */
in_frame->step_count = 0;
in_frame->steps = NULL;
/* play back steps of saved frame */
in_stack->record_undo_steps = 1;
for (int i = saved_frame.step_count-1; i >= 0; i--)
{
struct UndoStep *step = saved_frame.steps + i;
_undo_play_step(in_stack, step->action, step->data);
/* cleanup */
if (step->data) serbuff_destroy(step->data, 1);
}
if (saved_frame.steps) _stack_free(saved_frame.steps);
in_stack->record_undo_steps = 0;
}
/*
* stack_res_get
* ---------------------------------------------------------------------------------------------
* Accesses the details and/or data of the resource with the specified ID and type.
* Returns STACK_YES on success, STACK_NO otherwise.
*
* Only returns the arguments for which a non-NULL pointer is supplied.
*
* The result string and data remain valid until the next call, the stack is closed or
* stack_res_type_n() is invoked.
*
* An error can occur because the resource cannot be found or because of an I/O error.
*/
int stack_res_get(Stack *in_stack, int in_id, char const *in_type, char **out_name, void **out_data, long *out_size)
{
assert(IS_STACK(in_stack));
assert(in_id >= 1);
if (in_stack->_returned_res_str) _stack_free(in_stack->_returned_res_str);
in_stack->_returned_res_str = NULL;
if (in_stack->_returned_res_data) _stack_free(in_stack->_returned_res_data);
in_stack->_returned_res_data = NULL;
long data_size = 0;
sqlite3_stmt *stmt;
sqlite3_prepare_v2(in_stack->db, "SELECT resourcename,data FROM resource WHERE resourceid=?1 AND resourcetype=?2", -1, &stmt, NULL);
sqlite3_bind_int(stmt, 1, in_id);
sqlite3_bind_text(stmt, 2, in_type, -1, SQLITE_STATIC);
int err = sqlite3_step(stmt);
if (err == SQLITE_ROW) {
in_stack->_returned_res_str = _stack_clone_cstr((char*)sqlite3_column_text(stmt, 0));
data_size = sqlite3_column_bytes(stmt, 1);
in_stack->_returned_res_data = _stack_malloc(data_size);
if (!in_stack->_returned_res_data)
{
_stack_panic_void(in_stack, STACK_ERR_MEMORY);
sqlite3_finalize(stmt);
return STACK_NO;
}
else
memcpy(in_stack->_returned_res_data, sqlite3_column_blob(stmt, 1), data_size);
}
sqlite3_finalize(stmt);
if (err == SQLITE_ROW)
{
if (out_name) *out_name = in_stack->_returned_res_str;
if (out_data) *out_data = in_stack->_returned_res_data;
if (out_size) *out_size = data_size;
return STACK_YES;
}
else
return STACK_NO;
}
/*
* stack_res_type_n
* ---------------------------------------------------------------------------------------------
* Returns the name of the resource type with the specified number. Use with
* stack_res_type_count() to enumerate the various types of resources saved within the stack.
*
* The result string remains valid until the next call, the stack is closed or stack_res_get()
* is invoked.
*
* Returns NULL if no such type exists.
*/
char const* stack_res_type_n(Stack *in_stack, int in_number)
{
assert(IS_STACK(in_stack));
assert(in_number >= 1);
if (in_stack->_returned_res_str) _stack_free(in_stack->_returned_res_str);
in_stack->_returned_res_str = NULL;
sqlite3_stmt *stmt;
sqlite3_prepare_v2(in_stack->db, "SELECT DISTINCT resourcetype FROM resource ORDER BY resourcetype LIMIT ?1,1", -1, &stmt, NULL);
sqlite3_bind_int(stmt, 1, in_number-1);
int err = sqlite3_step(stmt);
if (err == SQLITE_ROW)
{
in_stack->_returned_res_str = _stack_clone_cstr((char*)sqlite3_column_text(stmt, 0));
}
sqlite3_finalize(stmt);
return in_stack->_returned_res_str;
}
char const* stack_name(Stack *in_stack)
{
if (in_stack->name) return in_stack->name;
char *temp = _stack_clone_cstr(in_stack->pathname);
in_stack->name = _stack_clone_cstr( basename(temp) );
_stack_free(temp);
long len = strlen(in_stack->name);
for (long i = len-1; i >= 0; i--)
{
if (in_stack->name[i] == '.')
{
in_stack->name[i] = 0;
break;
}
}
return in_stack->name;
}
void _zombify( pcb_t *pcb ) {
pcb_t *parent;
status_t stat;
pid_t pid;
key_t key;
info_t *info;
// sanity check
if( pcb == NULL ) {
_kpanic( "_zombify", "null pcb", 0 );
}
// Locate the parent of this process
parent = _pcb_find( pcb->ppid );
if( parent == NULL ) {
c_printf( "** zombify(): pid %d ppid %d\n",
pcb->pid, pcb->ppid );
_kpanic( "_zombify", "no process parent", 0 );
}
//
// Found the parent. If it's waiting for this process,
// wake it up, give it this process' status, and clean up.
//
if( parent->state == WAITING ) {
// get the address of the info structure from the
// parent, and pull out the desired PID
info = (info_t *) ARG(parent->context,1);
pid = info->pid;
// if the parent was waiting for any of its children
// or was waiting for us specifically, give it our
// information and terminate this process.
//
// if the parent was waiting for another child,
// turn this process into a zombie.
if( pid == 0 || pid == _current->pid ) {
// pull the parent off the waiting queue
key.u = parent->pid;
stat = _q_remove_by_key(&_waiting,(void **)&parent,key);
if( stat != E_SUCCESS ) {
_kpanic( "_zombify", "wait remove status %s",
stat );
}
// return our PID and our termination status
// to the parent
info->pid = _current->pid;
info->status = ARG(_current->context,1);
// clean up this process
stat = _stack_free( pcb->stack );
if( stat != E_SUCCESS ) {
_kpanic( "_zombify", "stack free status %s",
stat );
}
stat = _pcb_free( pcb );
if( stat != E_SUCCESS ) {
_kpanic( "_zombify", "pcb free status %s",
stat );
}
// schedule the parent; give it a quick dispatch
_schedule( parent, PRIO_MAXIMUM );
return;
}
}
//
// Our parent either wasn't waiting, or was waiting for someone
// else. Put this process on the zombie queue until our parent
// wants us.
//
key.u = _current->pid;
_current->state = ZOMBIE;
stat = _q_insert( &_zombie, (void *)_current, key );
if( stat != E_SUCCESS ) {
_kpanic( "_zombify", "zombie insert status %s", stat );
}
}
void serbuff_destroy(SerBuff *in_buff, int in_cleanup_data)
{
if (in_buff->data && in_cleanup_data) _stack_free(in_buff->data);
_stack_free(in_buff);
}