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GFileOutputStream provides output streams that write their content to a file.
GFileOutputStream implements GSeekable, which allows the output stream to jump to arbitrary positions in the file and to truncate the file, provided the filesystem of the file supports these operations.
To find the position of a file output stream, use g_seekable_tell().
To find out if a file output stream supports seeking, use
g_seekable_can_seek().To position a file output stream, use
g_seekable_seek(). To find out if a file output stream supports
truncating, use g_seekable_can_truncate(). To truncate a file output
stream, use g_seekable_truncate().
GFileInfo * g_file_output_stream_query_info (GFileOutputStream *stream,const char *attributes,GCancellable *cancellable,GError **error);
Queries a file output stream for the given attributes
. 
This function blocks while querying the stream. For the asynchronous 
version of this function, see g_file_output_stream_query_info_async(). 
While the stream is blocked, the stream will set the pending flag 
internally, and any other operations on the stream will fail with 
G_IO_ERROR_PENDING.
Can fail if the stream was already closed (with error
 being set to 
G_IO_ERROR_CLOSED), the stream has pending operations (with error
 being
set to G_IO_ERROR_PENDING), or if querying info is not supported for 
the stream's interface (with error
 being set to G_IO_ERROR_NOT_SUPPORTED). In
all cases of failure, NULL will be returned.
If cancellable
 is not NULL, then the operation can be cancelled by
triggering the cancellable object from another thread. If the operation
was cancelled, the error G_IO_ERROR_CANCELLED will be set, and NULL will 
be returned.
| stream | ||
| attributes | a file attribute query string. | |
| cancellable | optional GCancellable object,  | |
| error | 
void g_file_output_stream_query_info_async (GFileOutputStream *stream,const char *attributes,int io_priority,GCancellable *cancellable,GAsyncReadyCallback callback,gpointer user_data);
Asynchronously queries the stream
 for a GFileInfo. When completed,
callback
 will be called with a GAsyncResult which can be used to 
finish the operation with g_file_output_stream_query_info_finish().
For the synchronous version of this function, see 
g_file_output_stream_query_info().
| stream | ||
| attributes | a file attribute query string. | |
| io_priority | the I/O priority of the request | |
| cancellable | optional GCancellable object,  | |
| callback | callback to call when the request is satisfied | |
| user_data | the data to pass to callback function | 
GFileInfo * g_file_output_stream_query_info_finish (GFileOutputStream *stream,GAsyncResult *result,GError **error);
Finalizes the asynchronous query started 
by g_file_output_stream_query_info_async().
char *
g_file_output_stream_get_etag (GFileOutputStream *stream);
Gets the entity tag for the file when it has been written. This must be called after the stream has been written and closed, as the etag can change while writing.
typedef struct _GFileOutputStream GFileOutputStream;
A subclass of GOutputStream for opened files. This adds a few file-specific operations and seeking and truncating.
GFileOutputStream implements GSeekable.