path: root/contrib/perl5/ext/Socket/Socket.xs

#define PERL_NO_GET_CONTEXT
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"

#ifndef VMS
# ifdef I_SYS_TYPES
#  include <sys/types.h>
# endif
# include <sys/socket.h>
# if defined(USE_SOCKS) && defined(I_SOCKS)
#   include <socks.h>
# endif 
# ifdef MPE
#  define PF_INET AF_INET
#  define PF_UNIX AF_UNIX
#  define SOCK_RAW 3
# endif
# ifdef I_SYS_UN
#  include <sys/un.h>
# endif
/* XXX Configure test for <netinet/in_systm.h needed XXX */
# if defined(NeXT) || defined(__NeXT__)
#  include <netinet/in_systm.h>
# endif
# ifdef I_NETINET_IN
#  include <netinet/in.h>
# endif
# ifdef I_NETDB
#  include <netdb.h>
# endif
# ifdef I_ARPA_INET
#  include <arpa/inet.h>
# endif
# ifdef I_NETINET_TCP
#  include <netinet/tcp.h>
# endif
#else
# include "sockadapt.h"
#endif

#ifdef I_SYSUIO
# include <sys/uio.h>
#endif

#ifndef AF_NBS
# undef PF_NBS
#endif

#ifndef AF_X25
# undef PF_X25
#endif

#ifndef INADDR_NONE
# define INADDR_NONE	0xffffffff
#endif /* INADDR_NONE */
#ifndef INADDR_BROADCAST
# define INADDR_BROADCAST	0xffffffff
#endif /* INADDR_BROADCAST */
#ifndef INADDR_LOOPBACK
# define INADDR_LOOPBACK         0x7F000001
#endif /* INADDR_LOOPBACK */

#ifndef HAS_INET_ATON

/* 
 * Check whether "cp" is a valid ascii representation
 * of an Internet address and convert to a binary address.
 * Returns 1 if the address is valid, 0 if not.
 * This replaces inet_addr, the return value from which
 * cannot distinguish between failure and a local broadcast address.
 */
static int
my_inet_aton(register const char *cp, struct in_addr *addr)
{
	dTHX;
	register U32 val;
	register int base;
	register char c;
	int nparts;
	const char *s;
	unsigned int parts[4];
	register unsigned int *pp = parts;

	if (!cp)
		return 0;
	for (;;) {
		/*
		 * Collect number up to ``.''.
		 * Values are specified as for C:
		 * 0x=hex, 0=octal, other=decimal.
		 */
		val = 0; base = 10;
		if (*cp == '0') {
			if (*++cp == 'x' || *cp == 'X')
				base = 16, cp++;
			else
				base = 8;
		}
		while ((c = *cp) != '\0') {
			if (isDIGIT(c)) {
				val = (val * base) + (c - '0');
				cp++;
				continue;
			}
			if (base == 16 && (s=strchr(PL_hexdigit,c))) {
				val = (val << 4) + 
					((s - PL_hexdigit) & 15);
				cp++;
				continue;
			}
			break;
		}
		if (*cp == '.') {
			/*
			 * Internet format:
			 *	a.b.c.d
			 *	a.b.c	(with c treated as 16-bits)
			 *	a.b	(with b treated as 24 bits)
			 */
			if (pp >= parts + 3 || val > 0xff)
				return 0;
			*pp++ = val, cp++;
		} else
			break;
	}
	/*
	 * Check for trailing characters.
	 */
	if (*cp && !isSPACE(*cp))
		return 0;
	/*
	 * Concoct the address according to
	 * the number of parts specified.
	 */
	nparts = pp - parts + 1;	/* force to an int for switch() */
	switch (nparts) {

	case 1:				/* a -- 32 bits */
		break;

	case 2:				/* a.b -- 8.24 bits */
		if (val > 0xffffff)
			return 0;
		val |= parts[0] << 24;
		break;

	case 3:				/* a.b.c -- 8.8.16 bits */
		if (val > 0xffff)
			return 0;
		val |= (parts[0] << 24) | (parts[1] << 16);
		break;

	case 4:				/* a.b.c.d -- 8.8.8.8 bits */
		if (val > 0xff)
			return 0;
		val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
		break;
	}
	addr->s_addr = htonl(val);
	return 1;
}

#undef inet_aton
#define inet_aton my_inet_aton

#endif /* ! HAS_INET_ATON */


static int
not_here(char *s)
{
    croak("Socket::%s not implemented on this architecture", s);
    return -1;
}

static double
constant(char *name, int arg)
{
    errno = 0;
    switch (*name) {
    case 'A':
	if (strEQ(name, "AF_802"))
#ifdef AF_802
	    return AF_802;
#else
	    goto not_there;
#endif
	if (strEQ(name, "AF_APPLETALK"))
#ifdef AF_APPLETALK
	    return AF_APPLETALK;
#else
	    goto not_there;
#endif
	if (strEQ(name, "AF_CCITT"))
#ifdef AF_CCITT
	    return AF_CCITT;
#else
	    goto not_there;
#endif
	if (strEQ(name, "AF_CHAOS"))
#ifdef AF_CHAOS
	    return AF_CHAOS;
#else
	    goto not_there;
#endif
	if (strEQ(name, "AF_DATAKIT"))
#ifdef AF_DATAKIT
	    return AF_DATAKIT;
#else
	    goto not_there;
#endif
	if (strEQ(name, "AF_DECnet"))
#ifdef AF_DECnet
	    return AF_DECnet;
#else
	    goto not_there;
#endif
	if (strEQ(name, "AF_DLI"))
#ifdef AF_DLI
	    return AF_DLI;
#else
	    goto not_there;
#endif
	if (strEQ(name, "AF_ECMA"))
#ifdef AF_ECMA
	    return AF_ECMA;
#else
	    goto not_there;
#endif
	if (strEQ(name, "AF_GOSIP"))
#ifdef AF_GOSIP
	    return AF_GOSIP;
#else
	    goto not_there;
#endif
	if (strEQ(name, "AF_HYLINK"))
#ifdef AF_HYLINK
	    return AF_HYLINK;
#else
	    goto not_there;
#endif
	if (strEQ(name, "AF_IMPLINK"))
#ifdef AF_IMPLINK
	    return AF_IMPLINK;
#else
	    goto not_there;
#endif
	if (strEQ(name, "AF_INET"))
#ifdef AF_INET
	    return AF_INET;
#else
	    goto not_there;
#endif
	if (strEQ(name, "AF_LAT"))
#ifdef AF_LAT
	    return AF_LAT;
#else
	    goto not_there;
#endif
	if (strEQ(name, "AF_MAX"))
#ifdef AF_MAX
	    return AF_MAX;
#else
	    goto not_there;
#endif
	if (strEQ(name, "AF_NBS"))
#ifdef AF_NBS
	    return AF_NBS;
#else
	    goto not_there;
#endif
	if (strEQ(name, "AF_NIT"))
#ifdef AF_NIT
	    return AF_NIT;
#else
	    goto not_there;
#endif
	if (strEQ(name, "AF_NS"))
#ifdef AF_NS
	    return AF_NS;
#else
	    goto not_there;
#endif
	if (strEQ(name, "AF_OSI"))
#ifdef AF_OSI
	    return AF_OSI;
#else
	    goto not_there;
#endif
	if (strEQ(name, "AF_OSINET"))
#ifdef AF_OSINET
	    return AF_OSINET;
#else
	    goto not_there;
#endif
	if (strEQ(name, "AF_PUP"))
#ifdef AF_PUP
	    return AF_PUP;
#else
	    goto not_there;
#endif
	if (strEQ(name, "AF_SNA"))
#ifdef AF_SNA
	    return AF_SNA;
#else
	    goto not_there;
#endif
	if (strEQ(name, "AF_UNIX"))
#ifdef AF_UNIX
	    return AF_UNIX;
#else
	    goto not_there;
#endif
	if (strEQ(name, "AF_UNSPEC"))
#ifdef AF_UNSPEC
	    return AF_UNSPEC;
#else
	    goto not_there;
#endif
	if (strEQ(name, "AF_X25"))
#ifdef AF_X25
	    return AF_X25;
#else
	    goto not_there;
#endif
	break;
    case 'B':
	break;
    case 'C':
	break;
    case 'D':
	break;
    case 'E':
	break;
    case 'F':
	break;
    case 'G':
	break;
    case 'H':
	break;
    case 'I':
	if (strEQ(name, "IOV_MAX"))
#ifdef IOV_MAX
	    return IOV_MAX;
#else
	    goto not_there;
#endif
	if (strEQ(name, "IPPROTO_TCP"))
#ifdef IPPROTO_TCP
	    return IPPROTO_TCP;
#else
	    goto not_there;
#endif
	break;
    case 'J':
	break;
    case 'K':
	break;
    case 'L':
	break;
    case 'M':
	if (strEQ(name, "MSG_BCAST"))
#ifdef MSG_BCAST
	    return MSG_BCAST;
#else
	    goto not_there;
#endif
	if (strEQ(name, "MSG_CTLFLAGS"))
#ifdef MSG_CTLFLAGS
	    return MSG_CTLFLAGS;
#else
	    goto not_there;
#endif
	if (strEQ(name, "MSG_CTLIGNORE"))
#ifdef MSG_CTLIGNORE
	    return MSG_CTLIGNORE;
#else
	    goto not_there;
#endif
	if (strEQ(name, "MSG_CTRUNC"))
#if defined(MSG_TRUNC) || defined(HAS_MSG_CTRUNC) /* might be an enum */
	    return MSG_CTRUNC;
#else
	    goto not_there;
#endif
	if (strEQ(name, "MSG_DONTROUTE"))
#if defined(MSG_DONTROUTE) || defined(HAS_MSG_DONTROUTE) /* might be an enum */
	    return MSG_DONTROUTE;
#else
	    goto not_there;
#endif
	if (strEQ(name, "MSG_DONTWAIT"))
#ifdef MSG_DONTWAIT
	    return MSG_DONTWAIT;
#else
	    goto not_there;
#endif
	if (strEQ(name, "MSG_EOF"))
#ifdef MSG_EOF
	    return MSG_EOF;
#else
	    goto not_there;
#endif
	if (strEQ(name, "MSG_EOR"))
#ifdef MSG_EOR
	    return MSG_EOR;
#else
	    goto not_there;
#endif
	if (strEQ(name, "MSG_ERRQUEUE"))
#ifdef MSG_ERRQUEUE
	    return MSG_ERRQUEUE;
#else
	    goto not_there;
#endif
	if (strEQ(name, "MSG_FIN"))
#ifdef MSG_FIN
	    return MSG_FIN;
#else
	    goto not_there;
#endif
	if (strEQ(name, "MSG_MAXIOVLEN"))
#ifdef MSG_MAXIOVLEN
	    return MSG_MAXIOVLEN;
#else
	    goto not_there;
#endif
	if (strEQ(name, "MSG_MCAST"))
#ifdef MSG_MCAST
	    return MSG_MCAST;
#else
	    goto not_there;
#endif
	if (strEQ(name, "MSG_NOSIGNAL"))
#ifdef MSG_NOSIGNAL
	    return MSG_NOSIGNAL;
#else
	    goto not_there;
#endif
	if (strEQ(name, "MSG_OOB"))
#if defined(MSG_OOB) || defined(HAS_MSG_OOB) /* might be an enum */
	    return MSG_OOB;
#else
	    goto not_there;
#endif
	if (strEQ(name, "MSG_PEEK"))
#if defined(MSG_PEEK) || defined(HAS_MSG_PEEK) /* might be an enum */
	    return MSG_PEEK;
#else
	    goto not_there;
#endif
	if (strEQ(name, "MSG_PROXY"))
#if defined(MSG_PROXY) || defined(HAS_MSG_PROXY) /* might be an enum */
	    return MSG_PROXY;
#else
	    goto not_there;
#endif
	if (strEQ(name, "MSG_RST"))
#ifdef MSG_RST
	    return MSG_RST;
#else
	    goto not_there;
#endif
	if (strEQ(name, "MSG_SYN"))
#ifdef MSG_SYN
	    return MSG_SYN;
#else
	    goto not_there;
#endif
	if (strEQ(name, "MSG_TRUNC"))
#ifdef MSG_TRUNC
	    return MSG_TRUNC;
#else
	    goto not_there;
#endif
	if (strEQ(name, "MSG_WAITALL"))
#ifdef MSG_WAITALL
	    return MSG_WAITALL;
#else
	    goto not_there;
#endif
	break;
    case 'N':
	break;
    case 'O':
	break;
    case 'P':
	if (strEQ(name, "PF_802"))
#ifdef PF_802
	    return PF_802;
#else
	    goto not_there;
#endif
	if (strEQ(name, "PF_APPLETALK"))
#ifdef PF_APPLETALK
	    return PF_APPLETALK;
#else
	    goto not_there;
#endif
	if (strEQ(name, "PF_CCITT"))
#ifdef PF_CCITT
	    return PF_CCITT;
#else
	    goto not_there;
#endif
	if (strEQ(name, "PF_CHAOS"))
#ifdef PF_CHAOS
	    return PF_CHAOS;
#else
	    goto not_there;
#endif
	if (strEQ(name, "PF_DATAKIT"))
#ifdef PF_DATAKIT
	    return PF_DATAKIT;
#else
	    goto not_there;
#endif
	if (strEQ(name, "PF_DECnet"))
#ifdef PF_DECnet
	    return PF_DECnet;
#else
	    goto not_there;
#endif
	if (strEQ(name, "PF_DLI"))
#ifdef PF_DLI
	    return PF_DLI;
#else
	    goto not_there;
#endif
	if (strEQ(name, "PF_ECMA"))
#ifdef PF_ECMA
	    return PF_ECMA;
#else
	    goto not_there;
#endif
	if (strEQ(name, "PF_GOSIP"))
#ifdef PF_GOSIP
	    return PF_GOSIP;
#else
	    goto not_there;
#endif
	if (strEQ(name, "PF_HYLINK"))
#ifdef PF_HYLINK
	    return PF_HYLINK;
#else
	    goto not_there;
#endif
	if (strEQ(name, "PF_IMPLINK"))
#ifdef PF_IMPLINK
	    return PF_IMPLINK;
#else
	    goto not_there;
#endif
	if (strEQ(name, "PF_INET"))
#ifdef PF_INET
	    return PF_INET;
#else
	    goto not_there;
#endif
	if (strEQ(name, "PF_LAT"))
#ifdef PF_LAT
	    return PF_LAT;
#else
	    goto not_there;
#endif
	if (strEQ(name, "PF_MAX"))
#ifdef PF_MAX
	    return PF_MAX;
#else
	    goto not_there;
#endif
	if (strEQ(name, "PF_NBS"))
#ifdef PF_NBS
	    return PF_NBS;
#else
	    goto not_there;
#endif
	if (strEQ(name, "PF_NIT"))
#ifdef PF_NIT
	    return PF_NIT;
#else
	    goto not_there;
#endif
	if (strEQ(name, "PF_NS"))
#ifdef PF_NS
	    return PF_NS;
#else
	    goto not_there;
#endif
	if (strEQ(name, "PF_OSI"))
#ifdef PF_OSI
	    return PF_OSI;
#else
	    goto not_there;
#endif
	if (strEQ(name, "PF_OSINET"))
#ifdef PF_OSINET
	    return PF_OSINET;
#else
	    goto not_there;
#endif
	if (strEQ(name, "PF_PUP"))
#ifdef PF_PUP
	    return PF_PUP;
#else
	    goto not_there;
#endif
	if (strEQ(name, "PF_SNA"))
#ifdef PF_SNA
	    return PF_SNA;
#else
	    goto not_there;
#endif
	if (strEQ(name, "PF_UNIX"))
#ifdef PF_UNIX
	    return PF_UNIX;
#else
	    goto not_there;
#endif
	if (strEQ(name, "PF_UNSPEC"))
#ifdef PF_UNSPEC
	    return PF_UNSPEC;
#else
	    goto not_there;
#endif
	if (strEQ(name, "PF_X25"))
#ifdef PF_X25
	    return PF_X25;
#else
	    goto not_there;
#endif
	break;
    case 'Q':
	break;
    case 'R':
	break;
    case 'S':
	if (strEQ(name, "SCM_CONNECT"))
#ifdef SCM_CONNECT
	    return SCM_CONNECT;
#else
	    goto not_there;
#endif
	if (strEQ(name, "SCM_CREDENTIALS"))
#ifdef SCM_CREDENTIALS
	    return SCM_CREDENTIALS;
#else
	    goto not_there;
#endif
	if (strEQ(name, "SCM_CREDS"))
#ifdef SCM_CREDS
	    return SCM_CREDS;
#else
	    goto not_there;
#endif
	if (strEQ(name, "SCM_RIGHTS"))
#if defined(SCM_RIGHTS) || defined(HAS_SCM_RIGHTS) /* might be an enum */
	    return SCM_RIGHTS;
#else
	    goto not_there;
#endif
	if (strEQ(name, "SCM_TIMESTAMP"))
#ifdef SCM_TIMESTAMP
	    return SCM_TIMESTAMP;
#else
	    goto not_there;
#endif
	if (strEQ(name, "SHUT_RD"))
#ifdef SHUT_RD
	    return SHUT_RD;
#else
	    return 0;
#endif
	if (strEQ(name, "SHUT_RDWR"))
#ifdef SHUT_RDWR
	    return SHUT_RDWR;
#else
	    return 2;
#endif
	if (strEQ(name, "SHUT_WR"))
#ifdef SHUT_WR
	    return SHUT_WR;
#else
	    return 1;
#endif
	if (strEQ(name, "SOCK_DGRAM"))
#ifdef SOCK_DGRAM
	    return SOCK_DGRAM;
#else
	    goto not_there;
#endif
	if (strEQ(name, "SOCK_RAW"))
#ifdef SOCK_RAW
	    return SOCK_RAW;
#else
	    goto not_there;
#endif
	if (strEQ(name, "SOCK_RDM"))
#ifdef SOCK_RDM
	    return SOCK_RDM;
#else
	    goto not_there;
#endif
	if (strEQ(name, "SOCK_SEQPACKET"))
#ifdef SOCK_SEQPACKET
	    return SOCK_SEQPACKET;
#else
	    goto not_there;
#endif
	if (strEQ(name, "SOCK_STREAM"))
#ifdef SOCK_STREAM
	    return SOCK_STREAM;
#else
	    goto not_there;
#endif
	if (strEQ(name, "SOL_SOCKET"))
#ifdef SOL_SOCKET
	    return SOL_SOCKET;
#else
	    goto not_there;
#endif
	if (strEQ(name, "SOMAXCONN"))
#ifdef SOMAXCONN
	    return SOMAXCONN;
#else
	    goto not_there;
#endif
	if (strEQ(name, "SO_ACCEPTCONN"))
#ifdef SO_ACCEPTCONN
	    return SO_ACCEPTCONN;
#else
	    goto not_there;
#endif
	if (strEQ(name, "SO_BROADCAST"))
#ifdef SO_BROADCAST
	    return SO_BROADCAST;
#else
	    goto not_there;
#endif
	if (strEQ(name, "SO_DEBUG"))
#ifdef SO_DEBUG
	    return SO_DEBUG;
#else
	    goto not_there;
#endif
	if (strEQ(name, "SO_DONTLINGER"))
#ifdef SO_DONTLINGER
	    return SO_DONTLINGER;
#else
	    goto not_there;
#endif
	if (strEQ(name, "SO_DONTROUTE"))
#ifdef SO_DONTROUTE
	    return SO_DONTROUTE;
#else
	    goto not_there;
#endif
	if (strEQ(name, "SO_ERROR"))
#ifdef SO_ERROR
	    return SO_ERROR;
#else
	    goto not_there;
#endif
	if (strEQ(name, "SO_KEEPALIVE"))
#ifdef SO_KEEPALIVE
	    return SO_KEEPALIVE;
#else
	    goto not_there;
#endif
	if (strEQ(name, "SO_LINGER"))
#ifdef SO_LINGER
	    return SO_LINGER;
#else
	    goto not_there;
#endif
	if (strEQ(name, "SO_OOBINLINE"))
#ifdef SO_OOBINLINE
	    return SO_OOBINLINE;
#else
	    goto not_there;
#endif
	if (strEQ(name, "SO_RCVBUF"))
#ifdef SO_RCVBUF
	    return SO_RCVBUF;
#else
	    goto not_there;
#endif
	if (strEQ(name, "SO_RCVLOWAT"))
#ifdef SO_RCVLOWAT
	    return SO_RCVLOWAT;
#else
	    goto not_there;
#endif
	if (strEQ(name, "SO_RCVTIMEO"))
#ifdef SO_RCVTIMEO
	    return SO_RCVTIMEO;
#else
	    goto not_there;
#endif
	if (strEQ(name, "SO_REUSEADDR"))
#ifdef SO_REUSEADDR
	    return SO_REUSEADDR;
#else
	    goto not_there;
#endif
	if (strEQ(name, "SO_REUSEPORT"))
#ifdef SO_REUSEPORT
	    return SO_REUSEPORT;
#else
	    goto not_there;
#endif
	if (strEQ(name, "SO_SNDBUF"))
#ifdef SO_SNDBUF
	    return SO_SNDBUF;
#else
	    goto not_there;
#endif
	if (strEQ(name, "SO_SNDLOWAT"))
#ifdef SO_SNDLOWAT
	    return SO_SNDLOWAT;
#else
	    goto not_there;
#endif
	if (strEQ(name, "SO_SNDTIMEO"))
#ifdef SO_SNDTIMEO
	    return SO_SNDTIMEO;
#else
	    goto not_there;
#endif
	if (strEQ(name, "SO_TYPE"))
#ifdef SO_TYPE
	    return SO_TYPE;
#else
	    goto not_there;
#endif
	if (strEQ(name, "SO_USELOOPBACK"))
#ifdef SO_USELOOPBACK
	    return SO_USELOOPBACK;
#else
	    goto not_there;
#endif
	break;
    case 'T':
	if (strEQ(name, "TCP_KEEPALIVE"))
#ifdef TCP_KEEPALIVE
	    return TCP_KEEPALIVE;
#else
	    goto not_there;
#endif
	if (strEQ(name, "TCP_MAXRT"))
#ifdef TCP_MAXRT
	    return TCP_MAXRT;
#else
	    goto not_there;
#endif
	if (strEQ(name, "TCP_MAXSEG"))
#ifdef TCP_MAXSEG
	    return TCP_MAXSEG;
#else
	    goto not_there;
#endif
	if (strEQ(name, "TCP_NODELAY"))
#ifdef TCP_NODELAY
	    return TCP_NODELAY;
#else
	    goto not_there;
#endif
	if (strEQ(name, "TCP_STDURG"))
#ifdef TCP_STDURG
	    return TCP_STDURG;
#else
	    goto not_there;
#endif
	break;
    case 'U':
	if (strEQ(name, "UIO_MAXIOV"))
#ifdef UIO_MAXIOV
	    return UIO_MAXIOV;
#else
	    goto not_there;
#endif
	break;
    case 'V':
	break;
    case 'W':
	break;
    case 'X':
	break;
    case 'Y':
	break;
    case 'Z':
	break;
    }
    errno = EINVAL;
    return 0;

not_there:
    errno = ENOENT;
    return 0;
}


MODULE = Socket		PACKAGE = Socket

double
constant(name,arg)
	char *		name
	int		arg


void
inet_aton(host)
	char *	host
	CODE:
	{
	struct in_addr ip_address;
	struct hostent * phe;
	int ok = inet_aton(host, &ip_address);

	if (!ok && (phe = gethostbyname(host))) {
		Copy( phe->h_addr, &ip_address, phe->h_length, char );
		ok = 1;
	}

	ST(0) = sv_newmortal();
	if (ok) {
		sv_setpvn( ST(0), (char *)&ip_address, sizeof ip_address );
	}
	}

void
inet_ntoa(ip_address_sv)
	SV *	ip_address_sv
	CODE:
	{
	STRLEN addrlen;
	struct in_addr addr;
	char * addr_str;
	char * ip_address = SvPV(ip_address_sv,addrlen);
	if (addrlen != sizeof(addr)) {
	    croak("Bad arg length for %s, length is %d, should be %d",
			"Socket::inet_ntoa",
			addrlen, sizeof(addr));
	}

	Copy( ip_address, &addr, sizeof addr, char );
	addr_str = inet_ntoa(addr);

	ST(0) = sv_2mortal(newSVpvn(addr_str, strlen(addr_str)));
	}

void
pack_sockaddr_un(pathname)
	char *	pathname
	CODE:
	{
#ifdef I_SYS_UN
	struct sockaddr_un sun_ad; /* fear using sun */
	STRLEN len;

	Zero( &sun_ad, sizeof sun_ad, char );
	sun_ad.sun_family = AF_UNIX;
	len = strlen(pathname);
	if (len > sizeof(sun_ad.sun_path))
	    len = sizeof(sun_ad.sun_path);
#  ifdef OS2	/* Name should start with \socket\ and contain backslashes! */
	{
	    int off;
	    char *s, *e;

	    if (pathname[0] != '/' && pathname[0] != '\\')
		croak("Relative UNIX domain socket name '%s' unsupported", pathname);
	    else if (len < 8 
		     || pathname[7] != '/' && pathname[7] != '\\'
		     || !strnicmp(pathname + 1, "socket", 6))
		off = 7;
	    else
		off = 0;		/* Preserve names starting with \socket\ */
	    Copy( "\\socket", sun_ad.sun_path, off, char);
	    Copy( pathname, sun_ad.sun_path + off, len, char );

	    s = sun_ad.sun_path + off - 1;
	    e = s + len + 1;
	    while (++s < e)
		if (*s = '/')
		    *s = '\\';
	}
#  else	/* !( defined OS2 ) */ 
	Copy( pathname, sun_ad.sun_path, len, char );
#  endif
	ST(0) = sv_2mortal(newSVpvn((char *)&sun_ad, sizeof sun_ad));
#else
	ST(0) = (SV *) not_here("pack_sockaddr_un");
#endif
	
	}

void
unpack_sockaddr_un(sun_sv)
	SV *	sun_sv
	CODE:
	{
#ifdef I_SYS_UN
	struct sockaddr_un addr;
	STRLEN sockaddrlen;
	char * sun_ad = SvPV(sun_sv,sockaddrlen);
	char * e;
#   ifndef __linux__
	/* On Linux sockaddrlen on sockets returned by accept, recvfrom,
	   getpeername and getsockname is not equal to sizeof(addr). */
	if (sockaddrlen != sizeof(addr)) {
	    croak("Bad arg length for %s, length is %d, should be %d",
			"Socket::unpack_sockaddr_un",
			sockaddrlen, sizeof(addr));
	}
#   endif

	Copy( sun_ad, &addr, sizeof addr, char );

	if ( addr.sun_family != AF_UNIX ) {
	    croak("Bad address family for %s, got %d, should be %d",
			"Socket::unpack_sockaddr_un",
			addr.sun_family,
			AF_UNIX);
	}
	e = addr.sun_path;
	while (*e && e < addr.sun_path + sizeof addr.sun_path)
	    ++e;
	ST(0) = sv_2mortal(newSVpvn(addr.sun_path, e - addr.sun_path));
#else
	ST(0) = (SV *) not_here("unpack_sockaddr_un");
#endif
	}

void
pack_sockaddr_in(port,ip_address)
	unsigned short	port
	char *	ip_address
	CODE:
	{
	struct sockaddr_in sin;

	Zero( &sin, sizeof sin, char );
	sin.sin_family = AF_INET;
	sin.sin_port = htons(port);
	Copy( ip_address, &sin.sin_addr, sizeof sin.sin_addr, char );

	ST(0) = sv_2mortal(newSVpvn((char *)&sin, sizeof sin));
	}

void
unpack_sockaddr_in(sin_sv)
	SV *	sin_sv
	PPCODE:
	{
	STRLEN sockaddrlen;
	struct sockaddr_in addr;
	unsigned short	port;
	struct in_addr	ip_address;
	char *	sin = SvPV(sin_sv,sockaddrlen);
	if (sockaddrlen != sizeof(addr)) {
	    croak("Bad arg length for %s, length is %d, should be %d",
			"Socket::unpack_sockaddr_in",
			sockaddrlen, sizeof(addr));
	}
	Copy( sin, &addr,sizeof addr, char );
	if ( addr.sin_family != AF_INET ) {
	    croak("Bad address family for %s, got %d, should be %d",
			"Socket::unpack_sockaddr_in",
			addr.sin_family,
			AF_INET);
	} 
	port = ntohs(addr.sin_port);
	ip_address = addr.sin_addr;

	EXTEND(SP, 2);
	PUSHs(sv_2mortal(newSViv((IV) port)));
	PUSHs(sv_2mortal(newSVpvn((char *)&ip_address,sizeof ip_address)));
	}

void
INADDR_ANY()
	CODE:
	{
	struct in_addr	ip_address;
	ip_address.s_addr = htonl(INADDR_ANY);
	ST(0) = sv_2mortal(newSVpvn((char *)&ip_address,sizeof ip_address ));
	}

void
INADDR_LOOPBACK()
	CODE:
	{
	struct in_addr	ip_address;
	ip_address.s_addr = htonl(INADDR_LOOPBACK);
	ST(0) = sv_2mortal(newSVpvn((char *)&ip_address,sizeof ip_address));
	}

void
INADDR_NONE()
	CODE:
	{
	struct in_addr	ip_address;
	ip_address.s_addr = htonl(INADDR_NONE);
	ST(0) = sv_2mortal(newSVpvn((char *)&ip_address,sizeof ip_address));
	}

void
INADDR_BROADCAST()
	CODE:
	{
	struct in_addr	ip_address;
	ip_address.s_addr = htonl(INADDR_BROADCAST);
	ST(0) = sv_2mortal(newSVpvn((char *)&ip_address,sizeof ip_address));
	}