wine/server/object.c

287 lines
7.4 KiB
C

/*
* Server-side objects
*
* Copyright (C) 1998 Alexandre Julliard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "config.h"
#include "wine/port.h"
#include <assert.h>
#include <limits.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include "file.h"
#include "thread.h"
#include "unicode.h"
struct object_name
{
struct list entry; /* entry in the hash list */
struct object *obj;
size_t len;
WCHAR name[1];
};
struct namespace
{
unsigned int hash_size; /* size of hash table */
int case_sensitive; /* are names case sensitive? */
struct list names[1]; /* array of hash entry lists */
};
#ifdef DEBUG_OBJECTS
static struct list object_list = LIST_INIT(object_list);
void dump_objects(void)
{
struct list *p;
LIST_FOR_EACH( p, &object_list )
{
struct object *ptr = LIST_ENTRY( p, struct object, obj_list );
fprintf( stderr, "%p:%d: ", ptr, ptr->refcount );
ptr->ops->dump( ptr, 1 );
}
}
#endif
/*****************************************************************/
/* malloc replacement */
void *mem_alloc( size_t size )
{
void *ptr = malloc( size );
if (ptr) memset( ptr, 0x55, size );
else set_error( STATUS_NO_MEMORY );
return ptr;
}
/* duplicate a block of memory */
void *memdup( const void *data, size_t len )
{
void *ptr = malloc( len );
if (ptr) memcpy( ptr, data, len );
else set_error( STATUS_NO_MEMORY );
return ptr;
}
/*****************************************************************/
static int get_name_hash( const struct namespace *namespace, const WCHAR *name, size_t len )
{
WCHAR hash = 0;
len /= sizeof(WCHAR);
if (namespace->case_sensitive) while (len--) hash ^= *name++;
else while (len--) hash ^= tolowerW(*name++);
return hash % namespace->hash_size;
}
/* allocate a name for an object */
static struct object_name *alloc_name( const WCHAR *name, size_t len )
{
struct object_name *ptr;
if ((ptr = mem_alloc( sizeof(*ptr) + len - sizeof(ptr->name) )))
{
ptr->len = len;
memcpy( ptr->name, name, len );
}
return ptr;
}
/* free the name of an object */
static void free_name( struct object *obj )
{
struct object_name *ptr = obj->name;
list_remove( &ptr->entry );
free( ptr );
}
/* set the name of an existing object */
static void set_object_name( struct namespace *namespace,
struct object *obj, struct object_name *ptr )
{
int hash = get_name_hash( namespace, ptr->name, ptr->len );
list_add_head( &namespace->names[hash], &ptr->entry );
ptr->obj = obj;
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
list_add_head( &object_list, &obj->obj_list );
#endif
return obj;
}
return NULL;
}
void *create_named_object( struct namespace *namespace, const struct object_ops *ops,
const WCHAR *name, size_t len )
{
struct object *obj;
struct object_name *name_ptr;
if (!name || !len) return alloc_object( ops );
if ((obj = find_object( namespace, name, len )))
{
if (obj->ops == ops)
{
set_error( STATUS_OBJECT_NAME_COLLISION );
return obj;
}
set_error( STATUS_OBJECT_TYPE_MISMATCH );
return NULL;
}
if (!(name_ptr = alloc_name( name, len ))) return NULL;
if ((obj = alloc_object( ops )))
{
set_object_name( namespace, obj, name_ptr );
clear_error();
}
else free( name_ptr );
return obj;
}
/* dump the name of an object to stderr */
void dump_object_name( struct object *obj )
{
if (!obj->name) fprintf( stderr, "name=\"\"" );
else
{
fprintf( stderr, "name=L\"" );
dump_strW( obj->name->name, obj->name->len/sizeof(WCHAR), stderr, "\"\"" );
fputc( '\"', stderr );
}
}
/* 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 );
obj->ops->destroy( obj );
if (obj->name) free_name( obj );
#ifdef DEBUG_OBJECTS
list_remove( &obj->obj_list );
memset( obj, 0xaa, obj->ops->size );
#endif
free( obj );
}
}
/* find an object by its name; the refcount is incremented */
struct object *find_object( const struct namespace *namespace, const WCHAR *name, size_t len )
{
const struct list *list, *p;
if (!name || !len) return NULL;
list = &namespace->names[ get_name_hash( namespace, name, len ) ];
if (namespace->case_sensitive)
{
LIST_FOR_EACH( p, list )
{
struct object_name *ptr = LIST_ENTRY( p, struct object_name, entry );
if (ptr->len != len) continue;
if (!memcmp( ptr->name, name, len )) return grab_object( ptr->obj );
}
}
else
{
LIST_FOR_EACH( p, list )
{
struct object_name *ptr = LIST_ENTRY( p, struct object_name, entry );
if (ptr->len != len) continue;
if (!strncmpiW( ptr->name, name, len/sizeof(WCHAR) )) return grab_object( ptr->obj );
}
}
return NULL;
}
/* allocate a namespace */
struct namespace *create_namespace( unsigned int hash_size, int case_sensitive )
{
struct namespace *namespace;
unsigned int i;
namespace = mem_alloc( sizeof(*namespace) + (hash_size - 1) * sizeof(namespace->names[0]) );
if (namespace)
{
namespace->hash_size = hash_size;
namespace->case_sensitive = case_sensitive;
for (i = 0; i < hash_size; i++) list_init( &namespace->names[i] );
}
return namespace;
}
/* functions for unimplemented/default object operations */
int no_add_queue( struct object *obj, struct wait_queue_entry *entry )
{
set_error( STATUS_OBJECT_TYPE_MISMATCH );
return 0;
}
int no_satisfied( struct object *obj, struct thread *thread )
{
return 0; /* not abandoned */
}
struct fd *no_get_fd( struct object *obj )
{
set_error( STATUS_OBJECT_TYPE_MISMATCH );
return NULL;
}
void no_destroy( struct object *obj )
{
}