rpc.pmfd is the Sun RPC
server for serving the process monitor facility that is used by Sun Cluster
software. This daemon initially starts when the system comes up.
rpc.pmfd must be started as superuser so commands
that are queued to be monitored can be run as the user that submitted them.
To avoid collisions with other controlling processes, truss(1) does not allow
tracing a process that it detects as being controlled by another process by
way of the /proc interface. As rpc.pmfd
uses the /proc interface to monitor proceses and their
descendents, those processes cannot be traced or debugged.