Dear all,

it would be very helpful for me (and some others) if the 1.6.5 release
could have some support for SCTP.

To see what kind of change this requires I'm appending the diff files
for libguile/socket.[ch].

What are the changes (for socket.h)?

- add to prototypes for sctp-recvmsg and sctp-sendmsg.
   These changes are #ifdefed.

What are the changes (for socket.c)?

- include <netinet/sctp.h> if available. #ifdefed.
- add two line of code to initialize socket structures to zero.
   (If you do not like these two changes, take them out. They helped
    for some SCTP implementations not doing this in the kernel. At
    least one of them is fixed now).
- add sctp-recvmsg and sctp-sendmsg wrapper functions. These are 
#ifdefed.
- add some constants, if they are available. #ifdefed.

What is still missing (configure.in)?

- A check for the existence of netinet/sctp.h. If yes, define 
HAVE_NETINET_SCTP_H
- A check if sctp_sendmsg is contained in libsctp. If yes, define 
HAVE_SCTP_SENDMSG
   an add libsctp to the list of libraries to be used.
- A check if sctp_recvmsg is contained in libsctp. If yes, define 
HAVE_SCTP_RECVMSG
   an add libsctp to the list of libraries to be used.

(libsctp is located on some platforms in /usr/lib, /usr/local/lib and 
/usr/local/v6/lib)
This can be done by adding some lines to configure.in.

I will test the configure.in changes and send a patch for configure.in 
later
this week.

Please let me know if these patches can be included in the upcoming 
1.6.5 release.

Thank you very much.

Best regards
Michael