Added useful constructors for error.
Enhanced to SlaveHelper to handle bind(2).
Implemented bind(2) for Java.
Implemented the test for listen(2).
Configured to generate listen(2).
Fixed libcommand to return a correct name.
Implemented sigaction(2).
Enhanced to check if fmaster.ko is in the kernel.
Implemented kill(2) and signal handling.
Fixed to ignore EINTR in reading.
Added classes for signal.