[sct-hackers] sctrace patch

[Baruch E. <ba...@ev...>]

Hi,

I've just looked a bit at the code of sctrace (consider this a mini code
audit), and had a few things that I thought might be worth fixing.

Issues handled:
- Handling EINTR error code around blocking code (read and waitpid).
- Closing file handles that are only used to synchronize the parent and
  son processes.
- Remove rules from SCT in various error situations.

Patch is attached.

Baruch