92a1de471c
If the -p option is turned off, privileges from a setuid or setgid binary are dropped. Make sure to check if this succeeds. If it fails, this is an error which will cause the shell to abort except in interactive mode or if 'command' was used to make 'set' or an outer 'eval' or '.' non-special. Note that taking advantage of this feature and writing setuid shell scripts seems unwise. MFC after: 1 week