gssize fill ( GBufferedInputStream* stream, gssize count, GCancellable* cancellable, GError** error )
Tries to read
count bytes from the stream into the buffer.
Will block during this read.
count is zero, returns zero and does nothing. A value of
G_MAXSSIZE will cause a
On success, the number of bytes read into the buffer is returned.
It is not an error if this is not the same as the requested size, as it
can happen e.g. near the end of a file. Zero is returned on end of file
count is zero), but never otherwise.
count is -1 then the attempted read size is equal to the number of
bytes that are required to fill the buffer.
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 returned. If an
operation was partially finished when the operation was cancelled the
partial result will be returned, without an error.
On error -1 is returned and
error is set accordingly.
For the asynchronous, non-blocking, version of this function, see g_buffered_input_stream_fill_async().
The number of bytes that will be read from the stream.
The argument can be
The data is owned by the caller of the function.
The return location for a