t.i.p._FDDetector(object) : class documentation

This class contains the logic necessary to decide which of the available system techniques should be used to detect the open file descriptors for the current process. The chosen technique gets monkey-patched into the _listOpenFDs method of this class so that the detection only needs to occur once.

Unknown Field: ivars	listdir	The implementation of listdir to use. This gets overwritten by the test cases.
	getpid	The implementation of getpid to use, returns the PID of the running process.
	openfile	The implementation of open() to use, by default the Python builtin.

Method	_listOpenFDs	Figure out which implementation to use, then run it.
Method	_getImplementation	Check if /dev/fd works, if so, use that. Otherwise, check if /proc/%d/fd exists, if so use that.
Method	_checkDevFDSanity	Returns true iff opening a file modifies the fds visible in /dev/fd, as it should on a sane platform.
Method	_devFDImplementation	Simple implementation for systems where /dev/fd actually works. See: http://www.freebsd.org/cgi/man.cgi?fdescfs
Method	_procFDImplementation	Simple implementation for systems where /proc/pid/fd exists (we assume it works).
Method	_resourceFDImplementation	Fallback implementation where the resource module can inform us about how many FDs we can expect.
Method	_fallbackFDImplementation	Fallback-fallback implementation where we just assume that we need to close 256 FDs.