[ofa-general] QP connection healthy detection problem with fork/exec

[Tang, Changqing]

When a process fork/exec, isn't QP destroyed automatically ? If the QP is destroyed, then
RDMA operation is based on QP connection and should fail.

Also how do I set FD_CLOEXEC ? which fd in which structure ?


--CQ


> -----Original Message-----
> From: Daniel Noe [mailto:dpn at lampreynetworks.com]
> Sent: Thursday, March 27, 2008 11:39 PM
> To: Roland Dreier
> Cc: Tang, Changqing; general at lists.openfabrics.org
> Subject: Re: [ofa-general] QP connection healthy detection
> problem with fork/exec
>
> Roland Dreier wrote:
> > I think the problem is that exec() does not clean everything up.
> > AFAIK exec doesn't close open file descriptors so there's
> no way for
> > the kernel uverbs module to know that it should clean up.
>
> There is a file descriptor flag that can be set with fcntl():
> FD_CLOEXEC
>
> If this flag is set on an fd, the kernel closes that file
> descriptor on execve().
>
> Otherwise, the file descriptor remains open.
>
> Cheers,
> Dan
>
> --
> Dan Noe (dpn at lampreynetworks.com)
> Software Engineer
> Lamprey Networks, Inc.
>