mirror of
https://github.com/reactos/wine.git
synced 2024-12-05 10:17:57 +00:00
ebe29ef376
- merged request and reply structures - build requests directly into the buffer to avoid a copy
259 lines
5.8 KiB
C
259 lines
5.8 KiB
C
/*
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* Server-side objects
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* These are the server equivalent of K32OBJ
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*
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* Copyright (C) 1998 Alexandre Julliard
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*/
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#include <assert.h>
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#include <limits.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include "winerror.h"
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#include "thread.h"
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int debug_level = 0;
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struct object_name
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{
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struct object_name *next;
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struct object_name *prev;
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struct object *obj;
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size_t len;
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char name[1];
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};
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#define NAME_HASH_SIZE 37
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static struct object_name *names[NAME_HASH_SIZE];
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#ifdef DEBUG_OBJECTS
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static struct object *first;
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void dump_objects(void)
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{
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struct object *ptr = first;
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while (ptr)
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{
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fprintf( stderr, "%p:%d: ", ptr, ptr->refcount );
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ptr->ops->dump( ptr, 1 );
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ptr = ptr->next;
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}
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}
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#endif
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/*****************************************************************/
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/* malloc replacement */
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void *mem_alloc( size_t size )
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{
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void *ptr = malloc( size );
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if (ptr) memset( ptr, 0x55, size );
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else if (current) set_error( ERROR_OUTOFMEMORY );
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return ptr;
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}
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/*****************************************************************/
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static int get_name_hash( const char *name, size_t len )
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{
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char hash = 0;
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while (len--) hash ^= *name++;
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return hash % NAME_HASH_SIZE;
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}
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/* allocate a name for an object */
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static struct object_name *alloc_name( const char *name, size_t len )
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{
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struct object_name *ptr;
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if ((ptr = mem_alloc( sizeof(*ptr) + len )))
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{
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ptr->len = len;
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memcpy( ptr->name, name, len );
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ptr->name[len] = 0;
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}
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return ptr;
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}
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/* free the name of an object */
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static void free_name( struct object *obj )
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{
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struct object_name *ptr = obj->name;
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if (ptr->next) ptr->next->prev = ptr->prev;
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if (ptr->prev) ptr->prev->next = ptr->next;
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else
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{
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int hash;
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for (hash = 0; hash < NAME_HASH_SIZE; hash++)
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if (names[hash] == ptr)
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{
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names[hash] = ptr->next;
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break;
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}
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}
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free( ptr );
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}
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/* set the name of an existing object */
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static void set_object_name( struct object *obj, struct object_name *ptr )
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{
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int hash = get_name_hash( ptr->name, ptr->len );
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if ((ptr->next = names[hash]) != NULL) ptr->next->prev = ptr;
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ptr->obj = obj;
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ptr->prev = NULL;
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names[hash] = ptr;
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assert( !obj->name );
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obj->name = ptr;
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}
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/* allocate and initialize an object */
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void *alloc_object( const struct object_ops *ops )
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{
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struct object *obj = mem_alloc( ops->size );
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if (obj)
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{
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obj->refcount = 1;
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obj->ops = ops;
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obj->head = NULL;
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obj->tail = NULL;
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obj->name = NULL;
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#ifdef DEBUG_OBJECTS
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obj->prev = NULL;
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if ((obj->next = first) != NULL) obj->next->prev = obj;
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first = obj;
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#endif
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}
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return obj;
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}
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void *create_named_object( const struct object_ops *ops, const char *name, size_t len )
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{
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struct object *obj;
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struct object_name *name_ptr;
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if (!name || !len) return alloc_object( ops );
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if (!(name_ptr = alloc_name( name, len ))) return NULL;
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if ((obj = find_object( name_ptr->name, name_ptr->len )))
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{
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free( name_ptr ); /* we no longer need it */
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if (obj->ops == ops)
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{
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set_error( ERROR_ALREADY_EXISTS );
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return obj;
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}
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set_error( ERROR_INVALID_HANDLE );
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return NULL;
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}
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if ((obj = alloc_object( ops )))
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{
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set_object_name( obj, name_ptr );
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clear_error();
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}
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else free( name_ptr );
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return obj;
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}
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/* return a pointer to the object name, or to an empty string */
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const char *get_object_name( struct object *obj )
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{
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if (!obj->name) return "";
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return obj->name->name;
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}
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/* grab an object (i.e. increment its refcount) and return the object */
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struct object *grab_object( void *ptr )
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{
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struct object *obj = (struct object *)ptr;
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assert( obj->refcount < INT_MAX );
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obj->refcount++;
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return obj;
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}
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/* release an object (i.e. decrement its refcount) */
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void release_object( void *ptr )
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{
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struct object *obj = (struct object *)ptr;
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assert( obj->refcount );
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if (!--obj->refcount)
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{
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/* if the refcount is 0, nobody can be in the wait queue */
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assert( !obj->head );
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assert( !obj->tail );
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if (obj->name) free_name( obj );
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#ifdef DEBUG_OBJECTS
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if (obj->next) obj->next->prev = obj->prev;
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if (obj->prev) obj->prev->next = obj->next;
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else first = obj->next;
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#endif
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obj->ops->destroy( obj );
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memset( obj, 0xaa, obj->ops->size );
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free( obj );
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}
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}
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/* find an object by its name; the refcount is incremented */
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struct object *find_object( const char *name, size_t len )
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{
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struct object_name *ptr;
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if (!name || !len) return NULL;
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for (ptr = names[ get_name_hash( name, len ) ]; ptr; ptr = ptr->next)
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{
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if (ptr->len != len) continue;
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if (!memcmp( ptr->name, name, len )) return grab_object( ptr->obj );
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}
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return NULL;
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}
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/* functions for unimplemented object operations */
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int no_add_queue( struct object *obj, struct wait_queue_entry *entry )
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{
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set_error( ERROR_INVALID_HANDLE );
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return 0;
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}
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int no_satisfied( struct object *obj, struct thread *thread )
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{
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return 0; /* not abandoned */
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}
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int no_read_fd( struct object *obj )
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{
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set_error( ERROR_INVALID_HANDLE );
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return -1;
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}
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int no_write_fd( struct object *obj )
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{
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set_error( ERROR_INVALID_HANDLE );
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return -1;
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}
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int no_flush( struct object *obj )
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{
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set_error( ERROR_INVALID_HANDLE );
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return 0;
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}
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int no_get_file_info( struct object *obj, struct get_file_info_request *info )
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{
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set_error( ERROR_INVALID_HANDLE );
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return 0;
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}
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void no_destroy( struct object *obj )
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{
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}
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void default_select_event( int event, void *private )
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{
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struct object *obj = (struct object *)private;
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assert( obj );
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wake_up( obj, 0 );
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}
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