MODULE LinNet ["libc.so.90"];

	(*
		OpenBSD 6.2
		i386
	*)

	CONST
		NULL* = 0H;

		SOCKET_ERROR* = -1;
		INVALID_SOCKET* = -1;

		INADDR_NONE* = -1;
		INADDR_ANY* = 0;

		(* socket domains *)
			AF_UNSPEC* = 0; (* unspecified *)
			AF_LOCAL* = 1; (* local to host (pipes, portals) *)
			AF_UNIX* = AF_LOCAL; (* backward compatibility *)
			AF_INET* = 2; (* internetwork: UDP, TCP, etc. *)
			AF_IMPLINK* = 3; (* arpanet imp addresses *)
			AF_PUP* = 4; (* pup protocols: e.g. BSP *)
			AF_CHAOS* = 5; (* mit CHAOS protocols *)
			AF_NS* = 6; (* XEROX NS protocols *)
			AF_ISO* = 7; (* ISO protocols *)
			AF_ECMA* = 8; (* european computer manufacturers *)
			AF_DATAKIT* = 9; (* datakit protocols *)
			AF_CCITT* = 10; (* CCITT protocols, X.25 etc *)
			AF_SNA* = 11; (* IBM SNA *)
			AF_DECnet* = 12; (* DECnet *)
			AF_DLI* = 13; (* DEC Direct data link interface *)
			AF_LAT* = 14; (* LAT *)
			AF_HYLINK* = 15; (* NSC Hyperchannel *)
			AF_APPLETALK* = 16; (* Apple Talk *)
			AF_ROUTE* = 17; (* Internal Routing Protocol *)
			AF_LINK* = 18; (* Link layer interface *)
			AF_COIP* = 20; (* connection-oriented IP, aka ST II *)
			AF_CNT* = 21; (* Computer Network Technology *)
			AF_IPX* = 23; (* Novell Internet Protocol *)
			AF_INET6* = 24; (* IPv6 *)
			AF_ISDN* = 26; (* Integrated Services Digital Network *)
			AF_E164* = AF_ISDN; (* CCITT E.164 recommendation *)
			AF_NATM* = 27; (* native ATM access *)
			AF_ENCAP* = 28;
			AF_SIP* = 29; (* Simple Internet Protocol *)
			AF_KEY* = 30;
			AF_BLUETOOTH* = 32; (* Bluetooth *)
			AF_MPLS* = 33; (* MPLS *)
			AF_MAX* = 36;

		(* socket types *)
			SOCK_STREAM* = 1; (* stream socket *)
			SOCK_DGRAM* = 2; (* datagram socket *)
			SOCK_RAW* = 3; (* raw-protocol interface *)
			SOCK_RDM* = 4; (* reliably-delivered message *)
			SOCK_SEQPACKET* = 5; (* sequenced packet stream *)

		(* socket protocols *)
			IPPROTO_IP* = 0; (* dummy for IP *)
			IPPROTO_HOPOPTS* = IPPROTO_IP; (* Hop-by-hop option header *)
			IPPROTO_ICMP* = 1; (* control message protocol *)
			IPPROTO_IGMP* = 2; (* group mgmt protocol *)
			IPPROTO_GGP* = 3; (* gateway^2 (deprecated) *)
			IPPROTO_IPIP* = 4; (* IP inside IP *)
			IPPROTO_IPV4* = IPPROTO_IPIP; (* IP inside IP *)
			IPPROTO_TCP* = 6; (* tcp *)
			IPPROTO_EGP* = 8; (* exterior gateway protocol *)
			IPPROTO_PUP* = 12; (* pup *)
			IPPROTO_UDP* = 17; (* user datagram protocol *)
			IPPROTO_IDP* = 22; (* xns idp *)
			IPPROTO_TP* = 29; (* tp-4 w/ class negotiation *)
			IPPROTO_IPV6* = 41; (* IPv6 in IPv6 *)
			IPPROTO_ROUTING* = 43; (* Routing header *)
			IPPROTO_FRAGMENT* = 44; (* Fragmentation/reassembly header *)
			IPPROTO_RSVP* = 46; (* resource reservation *)
			IPPROTO_GRE* = 47; (* GRE encap, RFCs 1701/1702 *)
			IPPROTO_ESP* = 50; (* Encap. Security Payload *)
			IPPROTO_AH* = 51; (* Authentication header *)
			IPPROTO_MOBILE* = 55; (* IP Mobility, RFC 2004 *)
			IPPROTO_ICMPV6* = 58; (* ICMP for IPv6 *)
			IPPROTO_NONE* = 59; (* No next header *)
			IPPROTO_DSTOPTS* = 60; (* Destination options header *)
			IPPROTO_EON* = 80; (* ISO cnlp *)
			IPPROTO_ETHERIP* = 97; (* Ethernet in IPv4 *)
			IPPROTO_ENCAP* = 98; (* encapsulation header *)
			IPPROTO_PIM* = 103; (* Protocol indep. multicast *)
			IPPROTO_IPCOMP* = 108; (* IP Payload Comp. Protocol *)
			IPPROTO_CARP* = 112; (* CARP *)
			IPPROTO_MPLS* = 137; (* unicast MPLS packet *)
			IPPROTO_PFSYNC* = 240; (* PFSYNC *)
			IPPROTO_RAW* = 255; (* raw IP packet *)
			IPPROTO_MAX* = 256;
			IPPROTO_DIVERT* = 258; (* Divert sockets *)
			IPPROTO_DONE* = 257;
			IPPROTO_DIVERT_RESP* = 01H; (* {0} *) (* divert response packets *)
			IPPROTO_DIVERT_INIT* = 02H; (* {1} *) (* divert packets initial direction *)

		(* socket options *)
			SO_DEBUG* = {0}; (* turn on debugging info recording *)
			SO_ACCEPTCONN* = {1}; (* socket has had listen() *)
			SO_REUSEADDR* = {2}; (* allow local address reuse *)
			SO_KEEPALIVE* = {3}; (* keep connections alive *)
			SO_DONTROUTE* = {4}; (* just use interface addresses *)
			SO_BROADCAST* = {5}; (* permit sending of broadcast msgs *)
			SO_USELOOPBACK* = {6}; (* bypass hardware when possible *)
			SO_LINGER* = {7}; (* linger on close if data present *)
			SO_OOBINLINE* = {8}; (* leave received OOB data in line *)
			SO_REUSEPORT* = {9}; (* allow local address & port reuse *)
			SO_TIMESTAMP* = {11}; (* timestamp received dgram traffic *)
			SO_BINDANY* = {12}; (* allow bind to any address *)
			SO_ZEROIZE* = {13}; (* zero out all mbufs sent over socket *)
			SO_SNDBUF* = {0,12}; (* send buffer size *)
			SO_RCVBUF* = {1,12}; (* receive buffer size *)
			SO_SNDLOWAT* = {0,1,12}; (* send low-water mark *)
			SO_RCVLOWAT* = {2,12}; (* receive low-water mark *)
			SO_SNDTIMEO* = {0,2,12}; (* send timeout *)
			SO_RCVTIMEO* = {1,2,12}; (* receive timeout *)
			SO_ERROR* = {0..2,12}; (* get error status and clear *)
			SO_TYPE* = {3,12}; (* get socket type *)
			SO_NETPROC* = {5,12}; (* multiplex; network processing *)
			SO_RTABLE* = {0,5,12}; (* routing table to be used *)
			SO_PEERCRED* = {1,5,12}; (* get connect-time credentials *)
			SO_SPLICE* = {0,1,5,12}; (* splice data to other socket *)

		SHUT_RD* = 0;
		SHUT_WR* = 1;
		SHUT_RDWR* = 2;

		SOL_SOCKET* = 0FFFFH; (* {0..15} *) (* options for socket level *)

		MSG_OOB* = {0}; (* process out-of-band data *)
		MSG_PEEK* = {1}; (* peek at incoming message *)
		MSG_DONTROUTE* = {2}; (* send without using routing tables *)
		MSG_EOR* = {3}; (* data completes record *)
		MSG_TRUNC* = {4}; (* data discarded before delivery *)
		MSG_CTRUNC* = {5}; (* control data lost before delivery *)
		MSG_WAITALL* = {6}; (* wait for full request or error *)
		MSG_DONTWAIT* = {7}; (* this message should be nonblocking *)
		MSG_BCAST* = {8}; (* this message rec'd as broadcast *)
		MSG_MCAST* = {9}; (* this message rec'd as multicast *)
		MSG_NOSIGNAL* = {10}; (* do not send SIGPIPE *)
		MSG_CMSG_CLOEXEC* = {11}; (* set FD_CLOEXEC on received fds *)

		SOMAXCONN* = 128;

		(* addrinfo.ai_flags *)
			AI_PASSIVE* = {0}; (* socket address is intended for bind() *)
			AI_CANONNAME* = {1}; (* request for canonical name *)
			AI_NUMERICHOST* = {2}; (* don't ever try hostname lookup *)
			AI_EXT* = {3}; (* enable non-portable extensions *)
			AI_NUMERICSERV* = {4}; (* don't ever try servname lookup *)
			AI_FQDN* = {5}; (* return the FQDN that was resolved *)
			AI_ADDRCONFIG* = {6}; (* return configured address families only *)

		(* getaddrinfo/getnameinfo/gai_strerror error codes *)
			EAI_BADFLAGS* = -1; (* invalid value for ai_flags *)
			EAI_NONAME* = -2; (* name or service is not known *)
			EAI_AGAIN* = -3; (* temporary failure in name resolution *)
			EAI_FAIL* = -4; (* non-recoverable failure in name resolution *)
			EAI_NODATA* = -5; (* no address associated with name *)
			EAI_FAMILY* = -6; (* ai_family not supported *)
			EAI_SOCKTYPE* = -7; (* ai_socktype not supported *)
			EAI_SERVICE* = -8; (* service not supported for ai_socktype *)
			EAI_ADDRFAMILY* = -9; (* address family for name not supported *)
			EAI_MEMORY* = -10; (* memory allocation failure *)
			EAI_SYSTEM* = -11; (* system error (code indicated in errno) *)
			EAI_BADHINTS* = -12; (* invalid value for hints *)
			EAI_PROTOCOL* = -13; (* resolved protocol is unknown *)
			EAI_OVERFLOW* = -14; (* argument buffer overflow *)

		(* OpenBSD 6.0 /usr/include/sys/select.h *)
			FD_SETSIZE = 1024;
			__NBBY = 8;

	TYPE
		u_int8_t = SHORTCHAR;
		int8_t = SHORTCHAR;
		uint16_t = SHORTINT;
		(* PtrVoid, int, intFlags, short, socklen_t, size_t, ssize_t, in_addr_t, in_port_t, time_t, suseconds_t, nfds_t, sa_family_t *)
		PtrVoid* = INTEGER;
		short* = SHORTINT;
		int* = INTEGER;
		intFlags* = SET;
		size_t* = INTEGER;
		ssize_t* = INTEGER;
		time_t* = LONGINT;
		suseconds_t* = INTEGER;
		socklen_t* = INTEGER;
		in_addr_t* = INTEGER;
		in_port_t* = SHORTINT;
		nfds_t* = INTEGER;
		sa_family_t* = SHORTCHAR;

		PtrSTR* = POINTER [untagged] TO ARRAY [untagged] OF SHORTCHAR;

		SOCKET* = int;

(*
		in_addr* = RECORD [untagged]
			s_addr*: in_addr_t;
		END;
*)
		in_addr* = RECORD [untagged]
			S_un*: RECORD [union]
				S_un_b*: RECORD [untagged]
					s_b1*: SHORTCHAR;
					s_b2*: SHORTCHAR;
					s_b3*: SHORTCHAR;
					s_b4*: SHORTCHAR;
				END;
				S_un_w*: RECORD [untagged]
					s_w1*: SHORTINT;
					s_w2*: SHORTINT;
				END;
				S_addr*: in_addr_t;
			END;
		END;

		Ptrsockaddr* = POINTER [untagged] TO sockaddr;
		sockaddr* = RECORD [untagged]
			(* OpenBSD /usr/include/sys/socket.h *)
				sa_len*: SHORTCHAR; (* total length *)
				sa_family*: sa_family_t; (* address family *)
				sa_data*: ARRAY [untagged] 14 OF SHORTCHAR; (* actually longer; address value *)
		END;

		Ptrsockaddr_storage = POINTER [untagged] TO sockaddr_storage;
		sockaddr_storage* = RECORD [untagged]
			(* OpenBSD 6.0 /usr/include/sys/socket.h *)
				ss_len*: SHORTCHAR; (* total length *)
				ss_family*: sa_family_t; (* address family *)
				__ss_pad1: ARRAY [untagged] 6 OF SHORTCHAR; (* align to quad *)
				__ss_pad2: LONGINT; (* force alignment for stupid compilers *)
				__ss_pad3: ARRAY [untagged] 240 OF SHORTCHAR; (* pad to a total of 256 bytes *)
		END;

		Ptrsockaddr_in* = POINTER [untagged] TO sockaddr_in;
		sockaddr_in* = RECORD [untagged]
			(* OpenBSD /usr/include/netinet/in.h *)
				sin_len*: u_int8_t;
				sin_family*: sa_family_t;
				sin_port*: in_port_t;
				sin_addr*: in_addr;
				sin_zero*: ARRAY [untagged] 8 OF int8_t;
		END;

		Ptraddrinfo* = POINTER [untagged] TO addrinfo;
		addrinfo* = RECORD [untagged]
			(* OpenBSD 6.0 /usr/include/netdb.h *)
				ai_flags*: intFlags; (* input flags *)
				ai_family*: int; (* protocol family for socket *)
				ai_socktype*: int; (* socket type *)
				ai_protocol*: int; (* protocol for socket *)
				ai_addrlen*: socklen_t; (* length of socket-address *)
				ai_addr*: Ptrsockaddr; (* socket-address for socket *)
				ai_canonname*: PtrSTR; (* canonical name for service location (iff req) *)
				ai_next*: Ptraddrinfo; (* pointer to next in list *)
		END;

		timeval* = RECORD [untagged]
			(* Linux, FreeBSD, OpenBSD *)
				tv_sec*: time_t; (* seconds *)
				tv_usec*: suseconds_t; (* and microseconds *)
		END;

		pollfd* = RECORD [untagged]
			(* Linux, FreeBSD, OpenBSD *)
				fd*: int;
				events*: short;
				revents*: short;
		END;

		(* OpenBSD 6.0 /usr/include/sys/select.h *)
			__fd_mask = SET;
			fd_set* = ARRAY [untagged] (FD_SETSIZE + (SIZE(__fd_mask) * __NBBY - 1)) DIV (SIZE(__fd_mask) * __NBBY) OF __fd_mask;

	(* POSIX.1 *)
		PROCEDURE [ccall] socket* (domain: int; type: int; protocol: int): SOCKET;
		PROCEDURE [ccall] accept* (s: SOCKET; VAR addr: sockaddr; VAR addrlen: socklen_t): SOCKET;
		PROCEDURE [ccall] bind* (s: SOCKET; VAR name: sockaddr; namelen: socklen_t): int;
		PROCEDURE [ccall] connect* (s: SOCKET; VAR name: sockaddr; namelen: socklen_t): int;
		PROCEDURE [ccall] getsockname* (s: SOCKET; VAR name: sockaddr; VAR namelen: socklen_t): int;
		PROCEDURE [ccall] listen* (s: SOCKET; backlog: int): int;
		PROCEDURE [ccall] recv* (s: SOCKET; buf: PtrVoid; len: size_t; flags: intFlags): ssize_t;
		PROCEDURE [ccall] send* (s: SOCKET; msg: PtrVoid; len: size_t; flags: intFlags): ssize_t;
		PROCEDURE [ccall] shutdown* (s: SOCKET; how: int): int;
		PROCEDURE [ccall] getsockopt* (s: SOCKET; level: int; optname: intFlags; optval: PtrVoid; VAR [nil] optlen: socklen_t): int;
		PROCEDURE [ccall] setsockopt* (s: SOCKET; level: int; optname: intFlags; optval: PtrVoid; optlen: socklen_t): int;

		PROCEDURE [ccall] inet_addr* (cp: PtrSTR): in_addr_t;
		PROCEDURE [ccall] htons* (host16: uint16_t): uint16_t;

		PROCEDURE [ccall] select* (nfds: INTEGER; VAR [nil] readfds: fd_set; VAR [nil] writefds: fd_set; VAR [nil] exceptfds: fd_set; VAR timeout: timeval): int;

		PROCEDURE [ccall] poll* (VAR fds: ARRAY [untagged] OF pollfd; nfds: nfds_t; timeout: int): int;

(*
	PROCEDURE FD_ZERO (VAR set: Net.fd_set);
		VAR i: INTEGER;
	BEGIN
		i := LEN(set); REPEAT DEC(i); set[i] := {} UNTIL i = 0
	END FD_ZERO;

	PROCEDURE FD_SET (fd: Net.SOCKET; VAR set: Net.fd_set);
	BEGIN
		INCL(set[fd DIV 32], fd MOD 32)
	END FD_SET;
*)

	(* POSIX.1g *)
		PROCEDURE [ccall] getaddrinfo* (hostname: PtrSTR; servname: PtrSTR; VAR [nil] hints: addrinfo; VAR res: Ptraddrinfo): int;
		PROCEDURE [ccall] freeaddrinfo* (ai: Ptraddrinfo);

		PROCEDURE [ccall] gai_strerror* (ecode: int): PtrSTR;

END LinNet.