Proposal: a revoke() system call

[Poul-Henning Kamp]

In message <9820978.224231215452958017.JavaMail.root at vms227.mailsrvcs.net>, Ser
gey Babkin writes:

>Maybe make a new entry in devsw, requesting the driver to wake up
>all the sleepers (either coming from a particular file descriptor, or all
>the sleepers at all) and return EINTR for them. 

We have that, it's called ->d_purge(), but the semantics are "driver
or hardware going away", not "get rid of this thread/fd".

As I said earlier, this requires careful thought.

If the only reason we are dicussing this, is that people find the
magic pipe to select ugly, then I would even argue that we have not
reached critical mass for even thinking.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.