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server: Add support for opening a new file handle from a mapping object.

This commit is contained in:
Alexandre Julliard 2011-04-18 13:41:54 +02:00
parent 35431ed0e7
commit eb2fe39d63
4 changed files with 55 additions and 8 deletions
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25
server/file.c
View File

@ -141,6 +141,31 @@ struct file *create_file_for_fd( int fd, unsigned int access, unsigned int shari
return file;
}
/* create a file by duplicating an fd object */
struct file *create_file_for_fd_obj( struct fd *fd, unsigned int access, unsigned int sharing )
{
struct file *file;
struct stat st;
if (fstat( get_unix_fd(fd), &st ) == -1)
{
file_set_error();
return NULL;
}
if ((file = alloc_object( &file_ops )))
{
file->mode = st.st_mode;
file->access = default_fd_map_access( &file->obj, access );
if (!(file->fd = dup_fd_object( fd, access, sharing, FILE_SYNCHRONOUS_IO_NONALERT )))
{
release_object( file );
return NULL;
}
}
return file;
}
static struct object *create_file_obj( struct fd *fd, unsigned int access, mode_t mode )
{
struct file *file = alloc_object( &file_ops );

9
server/file.h
View File

@ -116,11 +116,20 @@ extern struct file *get_file_obj( struct process *process, obj_handle_t handle,
extern int get_file_unix_fd( struct file *file );
extern int is_same_file( struct file *file1, struct file *file2 );
extern struct file *create_file_for_fd( int fd, unsigned int access, unsigned int sharing );
extern struct file *create_file_for_fd_obj( struct fd *fd, unsigned int access, unsigned int sharing );
extern struct file *grab_file_unless_removable( struct file *file );
extern void file_set_error(void);
extern struct security_descriptor *mode_to_sd( mode_t mode, const SID *user, const SID *group );
extern mode_t sd_to_mode( const struct security_descriptor *sd, const SID *owner );
/* file mapping functions */
extern struct mapping *get_mapping_obj( struct process *process, obj_handle_t handle,
unsigned int access );
extern obj_handle_t open_mapping_file( struct process *process, struct mapping *mapping,
unsigned int access, unsigned int sharing );
extern int get_page_size(void);
/* change notification functions */
extern void do_change_notify( int unix_fd );

25
server/mapping.c
View File

@ -565,6 +565,24 @@ static struct object *create_mapping( struct directory *root, const struct unico
return NULL;
}
struct mapping *get_mapping_obj( struct process *process, obj_handle_t handle, unsigned int access )
{
return (struct mapping *)get_handle_obj( process, handle, access, &mapping_ops );
}
/* open a new file handle to the file backing the mapping */
obj_handle_t open_mapping_file( struct process *process, struct mapping *mapping,
unsigned int access, unsigned int sharing )
{
obj_handle_t handle;
struct file *file = create_file_for_fd_obj( mapping->fd, access, sharing );
if (!file) return 0;
handle = alloc_handle( process, file, access, 0 );
release_object( file );
return handle;
}
static void mapping_dump( struct object *obj, int verbose )
{
struct mapping *mapping = (struct mapping *)obj;
@ -682,8 +700,7 @@ DECL_HANDLER(get_mapping_info)
struct mapping *mapping;
struct fd *fd;
if ((mapping = (struct mapping *)get_handle_obj( current->process, req->handle,
req->access, &mapping_ops )))
if ((mapping = get_mapping_obj( current->process, req->handle, req->access )))
{
reply->size = mapping->size;
reply->protect = mapping->protect;
@ -713,7 +730,7 @@ DECL_HANDLER(get_mapping_committed_range)
{
struct mapping *mapping;
if ((mapping = (struct mapping *)get_handle_obj( current->process, req->handle, 0, &mapping_ops )))
if ((mapping = get_mapping_obj( current->process, req->handle, 0 )))
{
if (!(req->offset & page_mask) && req->offset < mapping->size)
reply->committed = find_committed_range( mapping, req->offset, &reply->size );
@ -729,7 +746,7 @@ DECL_HANDLER(add_mapping_committed_range)
{
struct mapping *mapping;
if ((mapping = (struct mapping *)get_handle_obj( current->process, req->handle, 0, &mapping_ops )))
if ((mapping = get_mapping_obj( current->process, req->handle, 0 )))
{
if (!(req->size & page_mask) &&
!(req->offset & page_mask) &&

4
server/object.h
View File

@ -180,10 +180,6 @@ extern void generate_debug_event( struct thread *thread, int code, const void *a
extern void generate_startup_debug_events( struct process *process, client_ptr_t entry );
extern void debug_exit_thread( struct thread *thread );
/* mapping functions */
extern int get_page_size(void);
/* registry functions */
extern unsigned int get_prefix_cpu_mask(void);