Class: cogen.core.sockets.SendFile
Uses underling OS sendfile call or a regular memory copy operation if
there is no sendfile.
You can use this as a WriteAll if you specify the length.
Usage:
yield sockets.SendFile(<file handle>, <sock>, 0) # will send till send operations return 0 yield sockets.SendFile(<file handle>, <sock>, 0, blocksize=0) # there will be only one send operation (if successfull) # that meas the whole file will be read in memory if there is #no sendfile yield sockets.SendFile(<file handle>, <sock>, 0, <file size>) # this will hang if we can't read <file size> bytes #from the file