cvs commit: src/lib/libc/net sctp_sys_calls.c src/sys/sys param.h

Robert Watson rwatson at
Fri Dec 15 15:57:09 PST 2006

On Fri, 15 Dec 2006, Randall Stewart wrote:

> There are only 4 new system calls..
> a) sctp_generic_sendmsg()
> b) sctp_generic_sendmsg_iov()
> c) sctp_generic_recvmsg()
> d) sctp_peeloff()
> Peeloff is a lot like accept() .. it returns a new socket. It could be move 
> to a socket option petty easily.. Michael Tuexen already did one for Apple 
> :-)

I'd really rather we didn't try to fit these sorts of things into socket 
options myself: the current blend of system calls and socket options for the 
new interfaces appears right to me.  Especially with respect to in-kernel 
consumers of socket interfaces, having the socket option code make assumptions 
about file descriptor arrays on the current process, etc, would not be the 
right thing.  Socket options work well for simple get/set interfaces, but 
going too much further is just asking for trouble.  It also makes handling 
issues like binary compatibility for ABI changes a lot more tricky: we have a 
mature mechanism for handling versioning of system calls, but not for socket 

Robert N M Watson
Computer Laboratory
University of Cambridge

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