--- Large File Object. -- Large file operations are supported up to 52 bits if the Lua number type is -- double (default). -- @cstyle instance module "nixio.File" --- Write to the file descriptor. -- @class function -- @name File.write -- @usage Warning: It is not guaranteed that all data -- in the buffer is written at once especially when dealing with pipes. -- You have to check the return value - the number of bytes actually written - -- or use the safe IO functions in the high-level IO utility module. -- @usage Unlike standard Lua indexing the lowest offset and default is 0. -- @param buffer Buffer holding the data to be written. -- @param offset Offset to start reading the buffer from. (optional) -- @param length Length of chunk to read from the buffer. (optional) -- @return number of bytes written --- Read from a file descriptor. -- @class function -- @name File.read -- @usage Warning: It is not guaranteed that all requested data -- is read at once especially when dealing with pipes. -- You have to check the return value - the length of the buffer actually read - -- or use the safe IO functions in the high-level IO utility module. -- @usage The length of the return buffer is limited by the (compile time) -- nixio buffersize which is nixio.const.buffersize (8192 by default). -- Any read request greater than that will be safely truncated to this value. -- @param length Amount of data to read (in Bytes). -- @return buffer containing data successfully read --- Reposition read / write offset of the file descriptor. -- The seek will be done either from the beginning of the file or relative -- to the current position or relative to the end. -- @class function -- @name File.seek -- @usage This function calls lseek(). -- @param offset File Offset -- @param whence Starting point ["set", "cur", "end"] -- @return new (absolute) offset position --- Return the current read / write offset of the file descriptor. -- @class function -- @name File.tell -- @usage This function calls lseek() with offset 0 from the current position. -- @return offset position --- Synchronizes the file with the storage device. -- Returns when the file is successfully written to the disk. -- @class function -- @name File.sync -- @usage This function calls fsync() when data_only equals false -- otherwise fdatasync(), on Windows _commit() is used instead. -- @usage fdatasync() is only supported by Linux and Solaris. For other systems -- the data_only parameter is ignored and fsync() is always called. -- @param data_only Do not synchronize the metadata. (optional, boolean) -- @return true --- Apply or test a lock on the file. -- @class function -- @name File.lock -- @usage This function calls lockf() on POSIX and _locking() on Windows. -- @usage The "lock" command is blocking, "tlock" is non-blocking, -- "ulock" unlocks and "test" only tests for the lock. -- @usage The "test" command is not available on Windows. -- @usage Locks are by default advisory on POSIX, but mandatory on Windows. -- @param command Locking Command ["lock", "tlock", "ulock", "test"] -- @param length Amount of Bytes to lock from current offset (optional) -- @return true --- Get file status and attributes. -- @class function -- @name File.stat -- @param field Only return a specific field, not the whole table (optional) -- @usage This function calls fstat(). -- @return Table containing: --- Close the file descriptor. -- @class function -- @name File.close -- @return true --- Get the number of the filedescriptor. -- @class function -- @name File.fileno -- @return file descriptor number --- (POSIX) Set the blocking mode of the file descriptor. -- @class function -- @name File.setblocking -- @param blocking (boolean) -- @return true