Myself, the World and Everything
Linux includes a syscall filter since a long time. It was restricted to a pre-defined set of syscalls. Since some versions Linux got a more generic filter.
Linux can use a BPF-filter to define actions for syscalls. This allows a fine granular specification on which syscalls to act. Also it …
I use UUCP to get my mails. It works fine but lacks support for modern SMTP features like DSN. While it may be possible to bolt support into the the rmail part, both the sendmail interface used to submit mails and the Postfix pipe daemon used to extract mail are …