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Made all handles multiple of 4. Fixed semantics for pseudo-handles.

This commit is contained in:
Alexandre Julliard 1999-11-04 02:33:45 +00:00
parent 1d22c531da
commit ceeb69371c
1 changed files with 59 additions and 36 deletions
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95
server/handle.c
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@ -51,6 +51,19 @@ static struct handle_table *global_table;
#define MIN_HANDLE_ENTRIES 32
/* handle to table index conversion */
/* handles are a multiple of 4 under NT; handle 0 is not used */
static int inline index_to_handle( int index )
{
return (index + 1) << 2;
}
static int inline handle_to_index( int handle )
{
return (handle >> 2) - 1;
}
static void handle_table_dump( struct object *obj, int verbose );
static void handle_table_destroy( struct object *obj );
@ -85,7 +98,7 @@ static void handle_table_dump( struct object *obj, int verbose )
for (i = 0; i <= table->last; i++, entry++)
{
if (!entry->ptr) continue;
fprintf( stderr, "%9d: %p %08x ", i + 1, entry->ptr, entry->access );
fprintf( stderr, "%9d: %p %08x ", index_to_handle(i), entry->ptr, entry->access );
entry->ptr->ops->dump( entry->ptr, 0 );
}
}
@ -143,23 +156,24 @@ static int grow_handle_table( struct handle_table *table )
return 1;
}
/* find the first free entry in the handle table */
static struct handle_entry *get_free_entry( struct handle_table *table, int *phandle )
/* allocate the first free entry in the handle table */
static int alloc_entry( struct handle_table *table, void *obj, unsigned int access )
{
struct handle_entry *entry = table->entries + table->free;
int handle;
int i;
for (handle = table->free; handle <= table->last; handle++, entry++)
if (!entry->ptr) goto found;
if (handle >= table->count)
for (i = table->free; i <= table->last; i++, entry++) if (!entry->ptr) goto found;
if (i >= table->count)
{
if (!grow_handle_table( table )) return NULL;
entry = table->entries + handle; /* the entries may have moved */
if (!grow_handle_table( table )) return -1;
entry = table->entries + i; /* the entries may have moved */
}
table->last = handle;
table->last = i;
found:
table->free = *phandle = handle + 1; /* avoid handle 0 */
return entry;
table->free = i + 1;
entry->ptr = grab_object( obj );
entry->access = access;
return index_to_handle(i);
}
/* allocate a handle for an object, incrementing its refcount */
@ -167,37 +181,29 @@ static struct handle_entry *get_free_entry( struct handle_table *table, int *pha
int alloc_handle( struct process *process, void *obj, unsigned int access, int inherit )
{
struct handle_table *table = (struct handle_table *)process->handles;
struct handle_entry *entry;
int handle;
assert( table );
assert( !(access & RESERVED_ALL) );
if (inherit) access |= RESERVED_INHERIT;
if (!(entry = get_free_entry( table, &handle ))) return -1;
entry->ptr = grab_object( obj );
entry->access = access;
return handle;
return alloc_entry( table, obj, access );
}
/* allocate a global handle for an object, incrementing its refcount */
/* return the handle, or -1 on error */
static int alloc_global_handle( void *obj, unsigned int access )
{
struct handle_entry *entry;
int handle;
if (!global_table)
{
if (!(global_table = (struct handle_table *)alloc_handle_table( NULL, 0 ))) return -1;
}
if (!(entry = get_free_entry( global_table, &handle ))) return -1;
entry->ptr = grab_object( obj );
entry->access = access;
return HANDLE_LOCAL_TO_GLOBAL(handle);
if ((handle = alloc_entry( global_table, obj, access )) != -1)
handle = HANDLE_LOCAL_TO_GLOBAL(handle);
return handle;
}
/* return an handle entry, or NULL if the handle is invalid */
/* return a handle entry, or NULL if the handle is invalid */
static struct handle_entry *get_handle( struct process *process, int handle )
{
struct handle_table *table = (struct handle_table *)process->handles;
@ -209,7 +215,7 @@ static struct handle_entry *get_handle( struct process *process, int handle )
table = global_table;
}
if (!table) goto error;
handle--; /* handles start at 1 */
handle = handle_to_index( handle );
if (handle < 0) goto error;
if (handle > table->last) goto error;
entry = table->entries + handle;
@ -281,7 +287,11 @@ int close_handle( struct process *process, int handle )
struct object *obj;
if (!(entry = get_handle( process, handle ))) return 0;
if (entry->access & RESERVED_CLOSE_PROTECT) return 0; /* FIXME: error code */
if (entry->access & RESERVED_CLOSE_PROTECT)
{
set_error( ERROR_INVALID_HANDLE );
return 0;
}
obj = entry->ptr;
entry->ptr = NULL;
table = HANDLE_IS_GLOBAL(handle) ? global_table : (struct handle_table *)process->handles;
@ -301,6 +311,21 @@ void close_global_handles(void)
}
}
/* retrieve the object corresponding to one of the magic pseudo-handles */
static inline struct object *get_magic_handle( int handle )
{
switch(handle)
{
case 0xfffffffe: /* current thread pseudo-handle */
return &current->obj;
case 0x7fffffff: /* current process pseudo-handle */
case 0xffffffff: /* current process pseudo-handle */
return (struct object *)current->process;
default:
return NULL;
}
}
/* retrieve the object corresponding to a handle, incrementing its refcount */
struct object *get_handle_obj( struct process *process, int handle,
unsigned int access, const struct object_ops *ops )
@ -308,15 +333,8 @@ struct object *get_handle_obj( struct process *process, int handle,
struct handle_entry *entry;
struct object *obj;
switch( handle )
if (!(obj = get_magic_handle( handle )))
{
case 0xfffffffe: /* current thread pseudo-handle */
obj = &current->obj;
break;
case 0x7fffffff: /* current process pseudo-handle */
obj = (struct object *)current->process;
break;
default:
if (!(entry = get_handle( process, handle ))) return NULL;
if ((entry->access & access) != access)
{
@ -324,7 +342,6 @@ struct object *get_handle_obj( struct process *process, int handle,
return NULL;
}
obj = entry->ptr;
break;
}
if (ops && (obj->ops != ops))
{
@ -340,6 +357,12 @@ static int set_handle_info( struct process *process, int handle, int mask, int f
{
struct handle_entry *entry;
if (get_magic_handle( handle ))
{
/* we can retrieve but not set info for magic handles */
if (mask) set_error( ERROR_ACCESS_DENIED );
return 0;
}
if (!(entry = get_handle( process, handle ))) return -1;
mask = (mask << RESERVED_SHIFT) & RESERVED_ALL;
flags = (flags << RESERVED_SHIFT) & mask;