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kern_ctl_reg ctl_sendsize/ctl_recvsize limits

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kern_ctl_reg ctl_sendsize/ctl_recvsize limits

Subject: kern_ctl_reg ctl_sendsize/ctl_recvsize limits
From: "Bhavesh Davda" <email@hidden>
Date: Tue, 12 Sep 2006 13:15:08 -0700

What are the limits on ctl_sendsize/ctl_recvsize when registering a
kernel control via ctl_register()?

Looking in xnu-792.10.96/bsd/kern/uipc_socket2.c: sbreserve(), it
looks like the limit is 256K*2K/(2K+256) = ~ 227 K.

Can it be higher than that?

If not, I have a problem and have to add some sort of flow control in
the clients of my kern_ctl NKE to make sure I don't overrun the socket
buffers.

Thanks!

--
Bhavesh P. Davda
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