$ cat /usr/include/sys/socket.h | grep SOCK_


#define SOCK_STREAM NC_TPI_COTS /* stream socket */
#define SOCK_DGRAM  NC_TPI_CLTS /* datagram socket */
#define SOCK_RAW    NC_TPI_RAW  /* raw-protocol interface */
#define SOCK_STREAM 2       /* stream socket */
#define SOCK_DGRAM  1       /* datagram socket */
#define SOCK_RAW    4       /* raw-protocol interface */
#define SOCK_RDM    5       /* reliably-delivered message */
#define SOCK_SEQPACKET  6       /* sequenced packet stream */


$ cat /usr/include/netinet/in.h | grep IPPROTO_


#define IPPROTO_IP      0       /* dummy for IP */
#define IPPROTO_HOPOPTS     0       /* Hop by hop header for IPv6 */
#define IPPROTO_ICMP        1       /* control message protocol */
#define IPPROTO_IGMP        2       /* group control protocol */
#define IPPROTO_GGP     3       /* gateway^2 (deprecated) */
#define IPPROTO_ENCAP       4       /* IP in IP encapsulation */
#define IPPROTO_TCP     6       /* tcp */
#define IPPROTO_EGP     8       /* exterior gateway protocol */
#define IPPROTO_PUP     12      /* pup */
#define IPPROTO_UDP     17      /* user datagram protocol */
#define IPPROTO_IDP     22      /* xns idp */
#define IPPROTO_IPV6        41      /* IPv6 encapsulated in IP */
#define IPPROTO_ROUTING     43      /* Routing header for IPv6 */
#define IPPROTO_FRAGMENT    44      /* Fragment header for IPv6 */
#define IPPROTO_RSVP        46      /* rsvp */
#define IPPROTO_ESP     50      /* IPsec Encap. Sec. Payload */
#define IPPROTO_AH      51      /* IPsec Authentication Hdr. */
#define IPPROTO_ICMPV6      58      /* ICMP for IPv6 */
#define IPPROTO_NONE        59      /* No next header for IPv6 */
#define IPPROTO_DSTOPTS     60      /* Destination options */
#define IPPROTO_HELLO       63      /* "hello" routing protocol */
#define IPPROTO_ND      77      /* UNOFFICIAL net disk proto */
#define IPPROTO_EON     80      /* ISO clnp */
#define IPPROTO_PIM     103     /* PIM routing protocol */
#define IPPROTO_SCTP        132     /* Stream Control */
#define IPPROTO_RAW     255     /* raw IP packet */
#define IPPROTO_MAX     256


$ cat /usr/include/sys/socket.h | grep AF_

#define SO_SRCADDR  0x2001      /* Internal: AF_UNIX source address */
#define SO_FILEP    0x2002      /* Internal: AF_UNIX file pointer */
#define SO_UNIX_CLOSE   0x2003      /* Internal: AF_UNIX peer closed */
#define AF_UNSPEC   0       /* unspecified */
#define AF_UNIX     1       /* local to host (pipes, portals) */
#define AF_INET     2       /* internetwork: UDP, TCP, etc. */
#define AF_IMPLINK  3       /* arpanet imp addresses */
#define AF_PUP      4       /* pup protocols: e.g. BSP */
#define AF_CHAOS    5       /* mit CHAOS protocols */
#define AF_NS       6       /* XEROX NS protocols */
#define AF_NBS      7       /* nbs protocols */
#define AF_ECMA     8       /* european computer manufacturers */
#define AF_DATAKIT  9       /* datakit protocols */
#define AF_CCITT    10      /* CCITT protocols, X.25 etc */
#define AF_SNA      11      /* IBM SNA */
#define AF_DECnet   12      /* DECnet */
#define AF_DLI      13      /* Direct data link interface */
#define AF_LAT      14      /* LAT */
#define AF_HYLINK   15      /* NSC Hyperchannel */
#define AF_APPLETALK    16      /* Apple Talk */
#define AF_NIT      17      /* Network Interface Tap */
#define AF_802      18      /* IEEE 802.2, also ISO 8802 */
#define AF_OSI      19      /* umbrella for all families used */
#define AF_X25      20      /* CCITT X.25 in particular */
#define AF_OSINET   21      /* AFI = 47, IDI = 4 */
#define AF_GOSIP    22      /* U.S. Government OSI */
#define AF_IPX      23      /* Novell Internet Protocol */
#define AF_ROUTE    24      /* Internal Routing Protocol */
#define AF_LINK     25      /* Link-layer interface */
#define AF_INET6    26      /* Internet Protocol, Version 6 */
#define AF_KEY      27      /* Security Association DB socket */
#define AF_NCA      28      /* NCA socket */
#define AF_POLICY   29      /* Security Policy DB socket */
#define AF_MAX      29
 * Common superset of at least AF_INET, AF_INET6 and AF_LINK sockaddr
#define PF_UNSPEC   AF_UNSPEC
#define PF_UNIX     AF_UNIX
#define PF_INET     AF_INET
#define PF_IMPLINK  AF_IMPLINK
#define PF_PUP      AF_PUP
#define PF_CHAOS    AF_CHAOS
#define PF_NS       AF_NS
#define PF_NBS      AF_NBS
#define PF_ECMA     AF_ECMA
#define PF_DATAKIT  AF_DATAKIT
#define PF_CCITT    AF_CCITT
#define PF_SNA      AF_SNA
#define PF_DECnet   AF_DECnet
#define PF_DLI      AF_DLI
#define PF_LAT      AF_LAT
#define PF_HYLINK   AF_HYLINK
#define PF_APPLETALK    AF_APPLETALK
#define PF_NIT      AF_NIT
#define PF_802      AF_802
#define PF_OSI      AF_OSI
#define PF_X25      AF_X25
#define PF_OSINET   AF_OSINET
#define PF_GOSIP    AF_GOSIP
#define PF_IPX      AF_IPX
#define PF_ROUTE    AF_ROUTE
#define PF_LINK     AF_LINK
#define PF_INET6    AF_INET6
#define PF_KEY      AF_KEY
#define PF_NCA      AF_NCA
#define PF_POLICY   AF_POLICY
#define PF_MAX      AF_MAX