Changes since the last edition of the manual

• The function recvmsg() now supports the option MSG_ERRQUEUE.
• New section "Error analysis" has been added. The sections describes the new functionalities of MSG_ERRQUEUE.
• New section "CMSG-Macros" has been added. It explains how to access cmsghdr structures correctly.
• getsockopt() has been supplemented by the subfunctions SO_TIMESTAMP, IP_MTU_DISCOVER, IP_OPTIONS, IP_RECVTTL, IPV6_MTU_DISCOVER, IPV6_RECVHOPLIMIT and IPV6_UNICAST_HOPS.
• setsockopt() has been supplemented by the subfunctions SO_TIMESTAMP, IP_OPTIONS, IP_RECVTTL, IPV6_RECVHOPLIMIT and IPV6_UNICAST_HOPS.
• Setting the IP_TTL and IPV6_HOPLIMIT option in setsockopt() and getsockopt() is now also allowed for IPPROTO_IPV4/IPPROTO_IPV6. Datagram sockets are supported.
• Setting the IP_MTU_DISCOVER and IPV6_MTU_DISCOVER option in setsockopt() and getsockopt() is now also allowed for IPPROTO_IPV4/IPPROTO_IPV6. Datagram sockets are supported.
• The subfunctions IP_RECVERR and IPV6_RECVERR in setsockopt() have been linked to the new MSG_ERRQUEUE.
• The description about the nslookup was moved to the user guide "openNet Server BCAM Volume 1/2".

Additional changes since SOCKETS V21.0A01:

• Both calls soc_poll() and select() now run with an accuracy of up to +200ms (previously up to +10s).
• soc_ioctl() has been supplemented by the subfunctions SIOCGBCPROC und SIOCGCBFQDN.