Description 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().