259 lines
5.8 KiB
C
259 lines
5.8 KiB
C
/*
|
|
* Server-side objects
|
|
* These are the server equivalent of K32OBJ
|
|
*
|
|
* Copyright (C) 1998 Alexandre Julliard
|
|
*/
|
|
|
|
#include <assert.h>
|
|
#include <limits.h>
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
|
|
#include "winerror.h"
|
|
#include "thread.h"
|
|
|
|
int debug_level = 0;
|
|
|
|
struct object_name
|
|
{
|
|
struct object_name *next;
|
|
struct object_name *prev;
|
|
struct object *obj;
|
|
size_t len;
|
|
char name[1];
|
|
};
|
|
|
|
#define NAME_HASH_SIZE 37
|
|
|
|
static struct object_name *names[NAME_HASH_SIZE];
|
|
|
|
#ifdef DEBUG_OBJECTS
|
|
static struct object *first;
|
|
|
|
void dump_objects(void)
|
|
{
|
|
struct object *ptr = first;
|
|
while (ptr)
|
|
{
|
|
fprintf( stderr, "%p:%d: ", ptr, ptr->refcount );
|
|
ptr->ops->dump( ptr, 1 );
|
|
ptr = ptr->next;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/*****************************************************************/
|
|
|
|
/* malloc replacement */
|
|
void *mem_alloc( size_t size )
|
|
{
|
|
void *ptr = malloc( size );
|
|
if (ptr) memset( ptr, 0x55, size );
|
|
else if (current) set_error( ERROR_OUTOFMEMORY );
|
|
return ptr;
|
|
}
|
|
|
|
/*****************************************************************/
|
|
|
|
static int get_name_hash( const char *name, size_t len )
|
|
{
|
|
char hash = 0;
|
|
while (len--) hash ^= *name++;
|
|
return hash % NAME_HASH_SIZE;
|
|
}
|
|
|
|
/* allocate a name for an object */
|
|
static struct object_name *alloc_name( const char *name, size_t len )
|
|
{
|
|
struct object_name *ptr;
|
|
|
|
if ((ptr = mem_alloc( sizeof(*ptr) + len )))
|
|
{
|
|
ptr->len = len;
|
|
memcpy( ptr->name, name, len );
|
|
ptr->name[len] = 0;
|
|
}
|
|
return ptr;
|
|
}
|
|
|
|
/* free the name of an object */
|
|
static void free_name( struct object *obj )
|
|
{
|
|
struct object_name *ptr = obj->name;
|
|
if (ptr->next) ptr->next->prev = ptr->prev;
|
|
if (ptr->prev) ptr->prev->next = ptr->next;
|
|
else
|
|
{
|
|
int hash;
|
|
for (hash = 0; hash < NAME_HASH_SIZE; hash++)
|
|
if (names[hash] == ptr)
|
|
{
|
|
names[hash] = ptr->next;
|
|
break;
|
|
}
|
|
}
|
|
free( ptr );
|
|
}
|
|
|
|
/* set the name of an existing object */
|
|
static void set_object_name( struct object *obj, struct object_name *ptr )
|
|
{
|
|
int hash = get_name_hash( ptr->name, ptr->len );
|
|
|
|
if ((ptr->next = names[hash]) != NULL) ptr->next->prev = ptr;
|
|
ptr->obj = obj;
|
|
ptr->prev = NULL;
|
|
names[hash] = ptr;
|
|
assert( !obj->name );
|
|
obj->name = ptr;
|
|
}
|
|
|
|
/* allocate and initialize an object */
|
|
void *alloc_object( const struct object_ops *ops )
|
|
{
|
|
struct object *obj = mem_alloc( ops->size );
|
|
if (obj)
|
|
{
|
|
obj->refcount = 1;
|
|
obj->ops = ops;
|
|
obj->head = NULL;
|
|
obj->tail = NULL;
|
|
obj->name = NULL;
|
|
#ifdef DEBUG_OBJECTS
|
|
obj->prev = NULL;
|
|
if ((obj->next = first) != NULL) obj->next->prev = obj;
|
|
first = obj;
|
|
#endif
|
|
}
|
|
return obj;
|
|
}
|
|
|
|
void *create_named_object( const struct object_ops *ops, const char *name, size_t len )
|
|
{
|
|
struct object *obj;
|
|
struct object_name *name_ptr;
|
|
|
|
if (!name || !len) return alloc_object( ops );
|
|
if (!(name_ptr = alloc_name( name, len ))) return NULL;
|
|
|
|
if ((obj = find_object( name_ptr->name, name_ptr->len )))
|
|
{
|
|
free( name_ptr ); /* we no longer need it */
|
|
if (obj->ops == ops)
|
|
{
|
|
set_error( ERROR_ALREADY_EXISTS );
|
|
return obj;
|
|
}
|
|
set_error( ERROR_INVALID_HANDLE );
|
|
return NULL;
|
|
}
|
|
if ((obj = alloc_object( ops )))
|
|
{
|
|
set_object_name( obj, name_ptr );
|
|
clear_error();
|
|
}
|
|
else free( name_ptr );
|
|
return obj;
|
|
}
|
|
|
|
/* return a pointer to the object name, or to an empty string */
|
|
const char *get_object_name( struct object *obj )
|
|
{
|
|
if (!obj->name) return "";
|
|
return obj->name->name;
|
|
}
|
|
|
|
/* grab an object (i.e. increment its refcount) and return the object */
|
|
struct object *grab_object( void *ptr )
|
|
{
|
|
struct object *obj = (struct object *)ptr;
|
|
assert( obj->refcount < INT_MAX );
|
|
obj->refcount++;
|
|
return obj;
|
|
}
|
|
|
|
/* release an object (i.e. decrement its refcount) */
|
|
void release_object( void *ptr )
|
|
{
|
|
struct object *obj = (struct object *)ptr;
|
|
assert( obj->refcount );
|
|
if (!--obj->refcount)
|
|
{
|
|
/* if the refcount is 0, nobody can be in the wait queue */
|
|
assert( !obj->head );
|
|
assert( !obj->tail );
|
|
if (obj->name) free_name( obj );
|
|
#ifdef DEBUG_OBJECTS
|
|
if (obj->next) obj->next->prev = obj->prev;
|
|
if (obj->prev) obj->prev->next = obj->next;
|
|
else first = obj->next;
|
|
#endif
|
|
obj->ops->destroy( obj );
|
|
memset( obj, 0xaa, obj->ops->size );
|
|
free( obj );
|
|
}
|
|
}
|
|
|
|
/* find an object by its name; the refcount is incremented */
|
|
struct object *find_object( const char *name, size_t len )
|
|
{
|
|
struct object_name *ptr;
|
|
if (!name || !len) return NULL;
|
|
for (ptr = names[ get_name_hash( name, len ) ]; ptr; ptr = ptr->next)
|
|
{
|
|
if (ptr->len != len) continue;
|
|
if (!memcmp( ptr->name, name, len )) return grab_object( ptr->obj );
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/* functions for unimplemented object operations */
|
|
|
|
int no_add_queue( struct object *obj, struct wait_queue_entry *entry )
|
|
{
|
|
set_error( ERROR_INVALID_HANDLE );
|
|
return 0;
|
|
}
|
|
|
|
int no_satisfied( struct object *obj, struct thread *thread )
|
|
{
|
|
return 0; /* not abandoned */
|
|
}
|
|
|
|
int no_read_fd( struct object *obj )
|
|
{
|
|
set_error( ERROR_INVALID_HANDLE );
|
|
return -1;
|
|
}
|
|
|
|
int no_write_fd( struct object *obj )
|
|
{
|
|
set_error( ERROR_INVALID_HANDLE );
|
|
return -1;
|
|
}
|
|
|
|
int no_flush( struct object *obj )
|
|
{
|
|
set_error( ERROR_INVALID_HANDLE );
|
|
return 0;
|
|
}
|
|
|
|
int no_get_file_info( struct object *obj, struct get_file_info_reply *info )
|
|
{
|
|
set_error( ERROR_INVALID_HANDLE );
|
|
return 0;
|
|
}
|
|
|
|
void no_destroy( struct object *obj )
|
|
{
|
|
}
|
|
|
|
void default_select_event( int event, void *private )
|
|
{
|
|
struct object *obj = (struct object *)private;
|
|
assert( obj );
|
|
wake_up( obj, 0 );
|
|
}
|