Proposal: a revoke() system call
phk at phk.freebsd.dk
Mon Jul 7 16:05:56 UTC 2008
In message <20080707162733.V63144 at fledge.watson.org>, Robert Watson writes:
>>> achieve something of the same end by opening /dev/null and then dup2()'ing
>>> to the file descriptor you want to revoke, perhaps? Right now there's a
>> That's a great idea. I haven't thought about it. It should do everything.
>Right, and possibly this means that no additional kernel support is required
>-- we just make it a libc or libutil interface.
I can't see how that could possibly work...
If you do a dup2(), the original fd is closed, and that still does not
release all threads that may be sleeing on it in device drivers.
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.
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