I'm looking to combine the getsockopt and setsockopt descriptions and
add the available constants, including the new IP_ADD_MEMBERSHIP and
IP_DROP_MEMBERSHIP, especially since you need to know to pass a pair
for those (and for SO_LINGER).
I'm not sure if SOL_IP is meant to be used directly. You'd think so
from the name, but the getsockopt man page refers to getprotoent(). I
think I'll change socket.c from IPPROTO_IP to SOL_IP. The two are the
same value, but best to ensure the code matches the docs.
-- Scheme Procedure: getsockopt sock level optname
-- Scheme Procedure: setsockopt sock level optname value
-- C Function: scm_getsockopt (sock, level, optname)
-- C Function: scm_setsockopt (sock, level, optname, value)
Get or set an option on socket port SOCK. `getsockopt' returns
the current value. `setsockopt' sets a value and the return is
unspecified.
LEVEL is an integer specifying a protocol layer. The following
values are defined (when provided by the system),
-- Variable: SOL_SOCKET
-- Variable: SOL_IP
-- Variable: SOL_TCP
-- Variable: SOL_UDP
OPTNAME is an integer specifying an option within the protocol
layer.
For `SOL_SOCK' level the following OPTNAMEs are defined (when
provided by the system). For what they mean see *note
Socket-Level Options: (libc)Socket-Level Options, or `man 7
socket'.
-- Variable: SO_DEBUG
-- Variable: SO_REUSEADDR
-- Variable: SO_STYLE
-- Variable: SO_TYPE
-- Variable: SO_ERROR
-- Variable: SO_DONTROUTE
-- Variable: SO_BROADCAST
-- Variable: SO_SNDBUF
-- Variable: SO_RCVBUF
-- Variable: SO_KEEPALIVE
-- Variable: SO_OOBINLINE
-- Variable: SO_NO_CHECK
-- Variable: SO_PRIORITY
The VALUE taken or returned is an integer.
-- Variable: SO_LINGER
The VALUE taken or returned is a pair of integers `(ENABLE .
TIMEOUT)'. On old systems without timeout support (ie.
without `struct linger'), only ENABLE has an effect, but the
value in Guile is still a pair.
For `SOL_IP' level the following options are defined (when
provided by the system). See `man 7 ip' for what they mean.
-- Variable: IP_ADD_MEMBERSHIP
-- Variable: IP_DROP_MEMBERSHIP
These can be used only with `setsockopt', not `getsockopt'.
VALUE is a pair of integer IPv4 addresses `(MULTIADDR .
INTERFACEADDR)' (*note Network Address Conversion::).
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