cvs commit: src/sys/sys filedesc.h

Matthew Dillon dillon at
Tue Jun 21 13:00:25 PDT 2005

:On Tue, Jun 21, 2005 at 10:59:47AM -0700, Matthew Dillon wrote:
:>   Bump fd_lastfile, freefile, and refcnt to 32 bit ints.  Also bump cmask
:>   (though that doesn't fix any particular bug).  lastfile and freefile were
:>   previously unsigned shorts which caused the system to become very confused
:>   when any single user process had more then 65535 open file descriptors.
:I don't think it can happen with a single process having 64k open file
:descriptors. It should hit resource limits much earlier. But it is
:certainly possible for multiple processes to reach this limit. On the
:other hand, that makes error handling kind of difficult, since e.g.
:fork() should be able to trigger it.

    This can happen trivially because Jeff sent me a program that blows
    the kernel up.  Resource limits are not hard-limited to 65535 so there
    is nothing preventing you from bumping them up.
					Matthew Dillon 
					<dillon at xxxxxxxxxxxxx>

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