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<HTML>
<HEAD>
<TITLE>System dependencies in the W3 library</TITLE>
<NEXTID N="z5">
</HEAD>
<BODY>
<H1>System Dependencies</H1>System-system differences for TCP
include files and macros. This file
includes for each system the files
necessary for network and file I/O.
 Part of <A NAME="z4" HREF="Overview.html">libwww</A>.

<H3>Authors</H3>
<DL>
<DT>TBL
<DD> Tim Berners-Lee, W3 project, CERN, &lt;timbl@info.cern.ch&gt;
<DT>EvA
<DD> Eelco van Asperen &lt;evas@cs.few.eur.nl&gt;
<DT>MA
<DD> Marc Andreesen NCSA
<DT>MD
<DD> Mark Donszelmann &lt;duns@vxcern.cern.ch&gt;
<DT>AT
<DD> Aleksandar Totic &lt;atotic@ncsa.uiuc.edu&gt;
<DT>SCW
<DD> Susan C. Weber &lt;sweber@kyle.eitech.com&gt;
<DT>HF
<DD> Henrik Frystyk, &lt;frystyk@dxcern.cern.ch&gt;
</DL>

<H3>History:</H3>
<DL>
<DT>22 Feb 91
<DD> Written (TBL) as part of
the WWW library.
<DT>16 Jan 92
<DD> PC code from (EvA)
<DT>22 Apr 93
<DD> Merged diffs bits from
xmosaic release
<DT>29 Apr 93
<DD> Windows/NT code from (SCW)
<DT>29 Sep 93
<DD> VMS fixes (MD)
</DL>

<PRE>
#ifndef TCP_H
#define TCP_H
</PRE>

<H2>Default values</H2>These values may be reset and altered by
system-specific sections later on. There is also a bunch of
<A NAME="z5" HREF="#z2">defaults</A> at the end and a section for
<A NAME="z11" HREF="#z10">ordinary BSD unix versions</A>.

<PRE>/* Default values of those: */
#define NETCLOSE close	    /* Routine to close a TCP-IP socket		*/
#define NETREAD  read	    /* Routine to read from a TCP-IP socket	*/
#define NETWRITE write	    /* Routine to write to a TCP-IP socket	*/

/* Unless stated otherwise, */
#define SELECT			/* Can handle &gt;1 channel.		*/
#define GOT_SYSTEM		/* Can call shell with string		*/

#ifdef unix
#define GOT_PIPE
#endif
#ifdef VM
#define GOT_PIPE		/* Of sorts */
#endif

#ifdef DECNET
typedef struct sockaddr_dn SockA;  /* See netdnet/dn.h or custom vms.h */
#else /* Internet */
typedef struct sockaddr_in SockA;  /* See netinet/in.h */
#endif
</PRE>

<A NAME="z1"><H1>Platform Specific Stuff</H1></A>
Information below this line is general for most platforms. <P>

See also <A NAME="z6" HREF="#z2">General Stuff</A>

<H2>Macintosh - Think-C</H2>

Think-C is one development environment on the Mac.<P>

We recommend that you compile with 4-byte ints to be compatible with
MPW C. We used Tom Milligan's s_socket library which was written for 4 byte
int, and the MacTCP library assumes 4-byte int.

<PRE>
#ifdef THINK_C
#undef GOT_SYSTEM
#define DEBUG			/* Can't put it on the CC command line	*/
#define NO_UNIX_IO		/* getuid() missing			*/
#define NO_GETPID		/* getpid() does not exist 		*/
#define NO_GETWD		/* getwd() does not exist 		*/

#undef NETCLOSE		    /* Routine to close a TCP-IP socket		*/
#undef NETREAD		    /* Routine to read from a TCP-IP socket	*/
#undef NETWRITE 	    /* Routine to write to a TCP-IP socket	*/
#define NETCLOSE s_close    /* Routine to close a TCP-IP socket		*/
#define NETREAD  s_read	    /* Routine to read from a TCP-IP socket	*/
#define NETWRITE s_write    /* Routine to write to a TCP-IP socket	*/

#define bind s_bind	    /* Funny names presumably to prevent clashes */
#define connect s_connect
#define accept s_accept
#define listen s_listen
#define socket s_socket
#define getsockname s_getsockname

/* The function prototype checking is better than the include files */

extern s_close(int s);
extern s_read(int s, char *buffer, int buflen);
extern s_write(int s, const char *buffer, int buflen);

extern bind(int s, struct sockaddr *name, int namelen);
extern accept(int s, struct sockaddr *addr, int *addrlen);
extern listen(int s, int qlen);
extern connect(int s, struct sockaddr *addr, int addrlen);

extern s_socket(int domain, int type, int protocol);
extern s_getsockname(int s, struct sockaddr *name, int *namelen);
extern struct hostent *gethostent(const char * name);
extern unsigned long inet_addr(const char * name);
#endif /* THINK_C */
</PRE>

<H2>Macintosh - MPW</H2>

MPW is one development environment on the Mac.<P>

This entry was created by Aleksandar Totic (atotic@ncsa.uiuc.edu) this
file is compatible with sockets package released by NCSA.  One major conflict
is that this library redefines write/read/etc as macros.  In some of HTML code
these macros get executed when they should not be. Such files should
define NO_SOCKET_DEFS on top. This is a temporary hack.

<PRE>
#ifdef applec			/* MPW  */
#undef GOT_SYSTEM
#define DEBUG			/* Can't put it on the CC command line */
#define NO_UNIX_IO		/* getuid() missing */
#define NO_GETPID		/* getpid() does not exist */
#define NO_GETWD		/* getwd() does not exist */

#undef NETCLOSE		    /* Routine to close a TCP-IP socket */
#undef NETREAD		    /* Routine to read from a TCP-IP socket */
#undef NETWRITE 	    /* Routine to write to a TCP-IP socket */
#define NETCLOSE s_close    /* Routine to close a TCP-IP socket */
#define NETREAD  s_read	    /* Routine to read from a TCP-IP socket */
#define NETWRITE s_write    /* Routine to write to a TCP-IP socket */
#define _ANSI_SOURCE
#define GUI
#define LINEFEED 10
#define ANON_FTP_HOSTNAME
#ifndef NO_SOCKET_DEFS
#include &lt;MacSockDefs.h&gt;
#endif /* NO_SOCKET_DEFS */

#include &lt;socket.ext.h&gt;
#include &lt;string.h&gt;

#endif /* MPW */

#ifndef STDIO_H
#include &lt;stdio.h&gt;
#define STDIO_H
#endif
</PRE>

<H2>Big Blue - the world of incompatibility</H2>

IBM RS600</H2>On the IBM RS-6000, AIX is almost Unix. <P>

<PRE>
#ifdef _AIX
#define AIX
#endif
#ifdef AIX
#define unix
#endif

/*    AIX 3.2
**    -------
*/

#ifdef _IBMR2
#define USE_DIRENT		/* sys V style directory open */
#endif
</PRE>

<H2>IBM VM-CMS, VM-XA Mainframes</H2>

MVS is compiled as for VM. MVS has no unix-style I/O.  The command line
compile options seem to come across in lower case.

<PRE>
#ifdef mvs
#define MVS
#endif

#ifdef MVS
#define VM
#endif

#ifdef NEWLIB
#pragma linkage(newlib,OS)	/* Enables recursive NEWLIB */
#endif

/*	VM doesn't have a built-in predefined token, so we cheat: */
#ifndef VM
#include &lt;string.h&gt;		/* For bzero etc - not  VM */
#endif

/*	Note:	All include file names must have 8 chars max (+".h")
**
**	Under VM, compile with "(DEF=VM,SHORT_NAMES,DEBUG)"
**
**	Under MVS, compile with "NOMAR DEF(MVS)" to get rid of 72 char margin
**	  System include files TCPIP and COMMMAC neeed line number removal(!)
*/

#ifdef VM			/* or MVS -- see above. */
#define NOT_ASCII		/* char type is not ASCII */
#define NO_UNIX_IO		/* Unix I/O routines are not supported */
#define NO_GETPID		/* getpid() does not exist */
#define NO_GETWD		/* getwd() does not exist */
#ifndef SHORT_NAMES
#define SHORT_NAMES		/* 8 character uniqueness for globals */
#endif
#include &lt;manifest.h&gt;
#include &lt;bsdtypes.h&gt;
#include &lt;stdefs.h&gt;
#include &lt;socket.h&gt;
#include &lt;in.h&gt;
#include &lt;inet.h&gt;
#include &lt;netdb.h&gt;
#include &lt;errno.h&gt;	    /* independent */
extern char asciitoebcdic[], ebcdictoascii[];
#define TOASCII(c)   (c=='\n' ?  10  : ebcdictoascii[c])
#define FROMASCII(c) (c== 10  ? '\n' : asciitoebcdic[c])
#include &lt;bsdtime.h&gt;
#include &lt;time.h&gt;
#include &lt;string.h&gt;
#define INCLUDES_DONE
#define TCP_INCLUDES_DONE
#endif
</PRE>

<H2>IBM-PC running MS-DOS with SunNFS for TCP/IP</H2>
This code thanks to Eelco van Asperen &lt;evas@cs.few.eur.nl&gt;

<PRE>
#ifdef PCNFS
#include &lt;sys/types.h&gt;
#include &lt;string.h&gt;
#include &lt;errno.h&gt;	    /* independent */
#include &lt;sys/time.h&gt;	    /* independent */
#include &lt;sys/stat.h&gt;
#include &lt;fcntl.h&gt;	    /* In place of sys/param and sys/file */
#define INCLUDES_DONE
#define FD_SET(fd,pmask) (*(unsigned*)(pmask)) |=  (1&lt;&lt;(fd))
#define FD_CLR(fd,pmask) (*(unsigned*)(pmask)) &amp;= ~(1&lt;&lt;(fd))
#define FD_ZERO(pmask)   (*(unsigned*)(pmask))=0
#define FD_ISSET(fd,pmask) (*(unsigned*)(pmask) &amp; (1&lt;&lt;(fd)))
#define NO_GROUPS
#endif  /* PCNFS */
</PRE>

<H2>IBM-PC running Windows NT</H2>
These parameters providede by  Susan C. Weber &lt;sweber@kyle.eitech.com&gt;.

<PRE>
#ifdef _WINDOWS
#include "fcntl.h"			/* For HTFile.c */
#include "sys\types.h"			/* For HTFile.c */
#include "sys\stat.h"			/* For HTFile.c */

#undef NETREAD
#undef NETWRITE
#undef NETCLOSE
#define NETREAD(s,b,l)	((s)&gt;10 ? recv((s),(b),(l),0) : read((s),(b),(l)))
#define NETWRITE(s,b,l)	((s)&gt;10 ? send((s),(b),(l),0) : write((s),(b),(l)))
#define NETCLOSE(s) 	((s)&gt;10 ? closesocket(s) : close(s))
#include &lt;io.h&gt;
#include &lt;string.h&gt;
#include &lt;process.h&gt;
#include &lt;time.h&gt;
#include &lt;direct.h&gt;
#include &lt;stdio.h&gt;
#include &lt;winsock.h&gt;
typedef struct sockaddr_in SockA;  /* See netinet/in.h */
#define INCLUDES_DONE
#define TCP_INCLUDES_DONE
#endif  /* WINDOWS */
</PRE>

<H2>VAX/VMS</H2>
Under VMS, there are many versions of TCP-IP. Define one if you do not
use Digital's UCX product:
<DL>
<DT>UCX
<DD> DEC's "Ultrix connection" (default)
<DT>WIN_TCP
<DD> From Wollongong, now GEC
software.
<DT>MULTINET
<DD> From SRI, now from TGV Inv.
<DT>DECNET
<DD> Cern's TCP socket emulation
over DECnet
</DL>
The last three do not interfere with
the unix i/o library, and so they
need special calls to read, write
and close sockets. In these cases
the socket number is a VMS channel
number, so we make the @@@ HORRIBLE
@@@ assumption that a channel number
will be greater than 10 but a unix
file descriptor less than 10.  It
works.

<PRE>
#ifdef VMS 
#define CACHE_FILE_PREFIX  "SYS$LOGIN:Z_"

#ifdef WIN_TCP
#undef NETREAD
#undef NETWRITE
#undef NETCLOSE
#define NETREAD(s,b,l)	((s)&gt;10 ? netread((s),(b),(l)) : read((s),(b),(l)))
#define NETWRITE(s,b,l)	((s)&gt;10 ? netwrite((s),(b),(l)) : write((s),(b),(l)))
#define NETCLOSE(s) 	((s)&gt;10 ? netclose(s) : close(s))
#endif /* WIN_TCP */

#ifdef MULTINET
#undef NETCLOSE
#undef NETREAD
#undef NETWRITE
#define NETREAD(s,b,l)	((s)&gt;10 ? socket_read((s),(b),(l)) : read((s),(b),(l)))
#define NETWRITE(s,b,l)	((s)&gt;10 ? socket_write((s),(b),(l)) : \
				write((s),(b),(l)))
#define NETCLOSE(s) 	((s)&gt;10 ? socket_close(s) : close(s))
#endif /* MULTINET */

#ifdef DECNET
#undef SELECT  /* not supported */
#undef NETREAD
#undef NETWRITE
#undef NETCLOSE
#define NETREAD(s,b,l)	((s)&gt;10 ? recv((s),(b),(l),0) : read((s),(b),(l)))
#define NETWRITE(s,b,l)	((s)&gt;10 ? send((s),(b),(l),0) : write((s),(b),(l)))
#define NETCLOSE(s) 	((s)&gt;10 ? socket_close(s) : close(s))
#endif /* Decnet */
         
/*	Certainly this works for UCX and Multinet; not tried for Wollongong
*/
#ifdef MULTINET
#include &lt;time.h&gt;
#ifdef __TIME_T
#define __TYPES
#define __TYPES_LOADED
#endif /* __TIME_T */
#include "multinet_root:[multinet.include.sys]types.h"
#include "multinet_root:[multinet.include]errno.h"
#ifdef __TYPES
#define __TIME_T
#endif /* __TYPE */
#ifdef __TIME_LOADED
#define __TIME
#endif /* __TIME_LOADED */
#include "multinet_root:[multinet.include.sys]time.h"
#else /* not MULTINET */
#include &lt;types.h&gt;
#include &lt;errno.h&gt;
#include &lt;time.h&gt;
#endif /* not MULTINET */

#include string

#ifndef STDIO_H
#include &lt;stdio&gt;
#define STDIO_H
#endif

#include file

#ifndef DECNET  /* Why is it used at all ? Types conflict with "types.h" */
#include unixio
#endif

#define INCLUDES_DONE

#ifdef MULTINET  /* Include from standard Multinet directories */
#include "multinet_root:[multinet.include.sys]socket.h"
#ifdef __TIME_LOADED  /* defined by sys$library:time.h */
#define __TIME  /* to avoid double definitions in next file */
#endif
#include "multinet_root:[multinet.include.netinet]in.h"
#include "multinet_root:[multinet.include.arpa]inet.h"
#include "multinet_root:[multinet.include]netdb.h"
#include "multinet_root:[multinet.include.sys]ioctl.h"

#else  /* not multinet */
#ifdef DECNET
#include "types.h"  /* for socket.h */
#include "socket.h"
#include "dn"
#include "dnetdb"
/* #include "vms.h" */

#else /* UCX or WIN */
#ifdef CADDR_T
#define __CADDR_T
#endif /* problem with xlib.h inclusion */
#include &lt;socket.h&gt;
#include &lt;in.h&gt;
#include &lt;inet.h&gt;
#include &lt;netdb.h&gt;
#include &lt;ucx$inetdef.h&gt;

#endif  /* not DECNET */
#endif  /* of Multinet or other TCP includes */

#define TCP_INCLUDES_DONE
</PRE>

On VMS directory browsing is available through a separate
copy of dirent.c. The definition of R_OK seem to be missing
from the system include files...

<PRE>
#define USE_DIRENT
#define GOT_READ_DIR 1
#include "dirent.h"
#define STRUCT_DIRENT struct dirent
#define R_OK 4
</PRE>

On VMS machines, the linker needs
to be told to put global data sections
into a data segment using these storage
classes. (MarkDonszelmann)

<PRE>
#ifdef VAXC
#define GLOBALDEF globaldef
#define GLOBALREF globalref
#endif /*  VAXC */
#endif	/* vms */
</PRE>

On non-VMS machines, the GLOBALDEF and GLOBALREF storage types default
to normal C storage types.

<PRE>
#ifndef GLOBALREF
#define GLOBALDEF
#define GLOBALREF extern
#endif
</PRE>

On non-VMS machines HTStat should be stat...On VMS machines
HTStat is a function that converts directories and devices so that you
can stat them.

<PRE>
#ifdef VMS
#define HTLstat HTStat
#else /* non VMS */
#define HTStat stat
#define HTLstat lstat
#endif /* non VMS */
</PRE>

<H2>SCO ODT unix version</H2>

(by Brian King)

<PRE>
#ifdef sco
#include &lt;grp.h&gt;
#include &lt;unistd.h&gt;
#include &lt;sys/fcntl.h&gt;
#include &lt;time.h&gt;
#define USE_DIRENT
#define NEED_INITGROUPS
#endif
</PRE>

<H2>MIPS unix</H2>
Mips hack (bsd4.3/sysV mixture...)

<PRE>
#ifdef Mips	/* Bruker */
extern int errno;
typedef mode_t		int;
#define S_ENFMT		S_ISGID		/* record locking enforcement flag */
#define S_ISCHR(m)	(m & S_IFCHR)
#define S_ISBLK(m)	(m & S_IFBLK)
#define WEXITSTATUS(s)	(((s).w_status &gt;&gt; 8) & 0377)
#define NO_STRFTIME
</PRE>

<H3>File Permissions</H3>

<PRE>
#ifndef S_IRWXU
#define S_IRWXU 0000700
#define S_IRWXG 0000070
#define S_IRWXO 0000007
#define S_IRUSR 0000400
#define S_IWUSR 0000200
#define S_IXUSR 0000100
#define S_IRGRP 0000040
#define S_IWGRP 0000020
#define S_IXGRP 0000010
#define S_IROTH 0000004
#define S_IWOTH 0000002
#define S_IXOTH 0000001
#endif /* S_IRWXU */
#endif /* Mips */
</PRE>

<H2>Solaris</H2>

Includes Linux (thanks to Rainer Klute) and other SVR5 based systems

<PRE>
#if defined(__svr4__) || defined(_POSIX_SOURCE) || defined(__hpux)

#ifdef UTS4				      /* UTS wants sys/types.h first */
#include &lt;sys/types.h&gt;
#endif

#include &lt;unistd.h&gt;

#ifdef UTS4
#include &lt;sys/fcntl.h&gt;
#define POSIXWAIT
#endif

#ifdef AIX						       /* Apple Unix */
#include &lt;fcntl.h&gt;
#else
#include &lt;sys/fcntl.h&gt;
#endif
</PRE>

This is for NCR 3000 and Pyramid that also are SVR4 systems. Thanks to
<EM>Alex Podlecki, &lt;a.podlecki@att.com&gt;</EM>

<PRE>
#ifndef NGROUPS_MAX		
#include &lt;limits.h&gt;
#endif 

#endif /* Solaris and SVR5 */
</PRE>

<H2>UTS 2.1 (BSD-like)</H2>
<PRE>
#ifdef UTS2
#include &lt;time.h&gt;
#include &lt;fcntl.h&gt;

#define	NO_STRFTIME
#define	WEXITSTATUS(x)	((int)((x).w_T.w_Retcode))

#undef POSIXWAIT
#endif /* UTS2 */
</PRE>

<H2>OSF/1</H2>
<PRE>
#ifdef __osf__
#define USE_DIRENT
#endif /* OSF1 AXP */
</PRE>

<H2>ISC 3.0</H2>
by Lauren Weinstein &lt;lauren@vortex.com&gt;.
<PRE>

#ifdef ISC3			/* Lauren */
#define USE_DIRENT
#define GOT_READ_DIR 1
#include &lt;sys/ipc.h&gt;
#include &lt;sys/dirent.h&gt;
#define direct dirent
#include &lt;sys/unistd.h&gt;
#define d_namlen d_reclen
#include &lt;sys/limits.h&gt;

#define SIGSTP
#define POSIXWAIT
#include &lt;sys/types.h&gt;
#include &lt;sys/wait.h&gt;
#include &lt;net/errno.h&gt;

#define _SYSV3
#include &lt;time.h&gt;

#include &lt;sys/fcntl.h&gt;
#define S_ISDIR(m)	(((m) & 0170000) == 0040000)
#define S_ISCHR(m)	(((m) & 0170000) == 0020000)
#define S_ISBLK(m)	(((m) & 0170000) == 0060000)
#define S_ISREG(m)	(((m) & 0170000) == 0100000)
#define S_ISFIFO(m)	(((m) & 0170000) == 0010000)
#define S_ISLNK(m)	(((m) & 0170000) == 0120000)
#endif	/* ISC 3.0 */
</PRE>

<H2>SOCKS</H2>
SOCKS modifications by Ian Dunkin &lt;imd1707@ggr.co.uk&gt;.
<PRE>
#if defined(SOCKS) && !defined(RULE_FILE)
#define connect Rconnect
#define accept  Raccept
#define getsockname Rgetsockname
#define bind Rbind 
#define listen Rlisten  
#endif
</PRE>

<H2>NeXT</H2>
<PRE>
#ifdef NeXT
#include "sys/types.h"
#include "sys/stat.h"

typedef unsigned short mode_t;

#ifndef S_ISDIR
#define S_ISDIR(m)     (m &amp; S_IFDIR)
#define S_ISREG(m)     (m &amp; S_IFREG)
#define S_ISCHR(m)     (m &amp; S_IFCHR)
#define S_ISBLK(m)     (m &amp; S_IFBLK)
#define S_ISLNK(m)     (m &amp; S_IFLNK)
#define S_ISSOCK(m)    (m &amp; S_IFSOCK)
#define S_ISFIFO(m)    (NO)
#endif

#ifndef WEXITSTATUS
#define WEXITSTATUS(s) (((s).w_status &gt;&gt; 8) &amp; 0377)
#endif
</PRE>

<H3>File Permissions for NeXT</H3>
<PRE>
#ifndef S_IRWXU
#define S_IRWXU 0000700
#define S_IRWXG 0000070
#define S_IRWXO 0000007
#define S_IRUSR 0000400
#define S_IWUSR 0000200
#define S_IXUSR 0000100
#define S_IRGRP 0000040
#define S_IWGRP 0000020
#define S_IXGRP 0000010
#define S_IROTH 0000004
#define S_IWOTH 0000002
#define S_IXOTH 0000001
#endif /* S_IRWXU */
#endif /* NeXT */
</PRE>

<H2>A/UX Apple UNIX</H2>

<ADDRESS>Kelly King, bhutab@apple.com and Jim Jagielski,
jim@jagubox.gsfc.nasa.gov</ADDRESS>

<PRE>
#ifdef _AUX
#include &lt;time.h&gt;
#define WEXITSTATUS(s) (((s).w_status &gt;&gt; 8) &amp; 0377)
#endif
</PRE>

<H2><A NAME="z10">Regular BSD unix versions</H2>

These are a default unix where not already defined specifically.

<PRE>
#ifndef INCLUDES_DONE

#include &lt;sys/types.h&gt;
#include &lt;string.h&gt;

#include &lt;errno.h&gt;	    /* independent */
#include &lt;sys/time.h&gt;	    /* independent */
#include &lt;sys/stat.h&gt;
#include &lt;sys/param.h&gt;
#include &lt;sys/file.h&gt;	    /* For open() etc */
#define INCLUDES_DONE
#endif	/* Normal includes */
</PRE>

<H3>Directory reading stuff - BSD or SYS V</H3>
<PRE>
#ifdef unix                    	  /* if this is to compile on a UNIX machine */
#define GOT_READ_DIR 1       /* if directory reading functions are available */

#ifndef NeXT
#define USE_DIRENT		  /* Try this all the time, Henrik May 29 94 */
#endif
#ifdef USE_DIRENT             			 	    /* sys v version */
#include &lt;dirent.h&gt;
#define STRUCT_DIRENT struct dirent
#else
#include &lt;sys/dir.h&gt;
#define STRUCT_DIRENT struct direct
#endif

#if defined(sun) &amp;&amp; defined(__svr4__)
#include &lt;sys/fcntl.h&gt;
#include &lt;limits.h&gt;
#endif
#ifndef FNDELAY
#define FNDELAY		O_NDELAY
#endif
#endif
</PRE>

<H1><A NAME="z2">General Stuff</A></H1>

Information below this line is general for most platforms. <P>

See also <A NAME="z3" HREF="#z1">Platform Specific Stuff</A>

<H3>Include files for TCP</H3>
<PRE>
#ifndef TCP_INCLUDES_DONE
#include &lt;sys/socket.h&gt;
#include &lt;netinet/in.h&gt;

/* #ifndef __hpux */ /* this may or may not be good -marc -- according
			to somebody, it wasn't a good thing...(?) -- Ari */
#include &lt;arpa/inet.h&gt;	    /* Must be after netinet/in.h */
/* #endif */

#include &lt;netdb.h&gt;
#endif	/* TCP includes */
</PRE>

<H3>Rough estimate of max path length</H3>
<PRE>
#ifndef HT_MAX_PATH
#ifdef MAXPATHLEN
#define HT_MAX_PATH MAXPATHLEN
#else
#ifdef PATH_MAX
#define HT_MAX_PATH PATH_MAX
#else
#define HT_MAX_PATH 1024	 	      	/* Any better ideas? */
#endif
#endif
#endif /* HT_MAX_PATH */
</PRE>


<H3>Definition of NGROUPS</H3>
<PRE>
#ifdef NO_UNIX_IO
#define NO_GROUPS
#endif

#ifndef NO_GROUPS
#ifndef NGROUPS
#ifdef NGROUPS_MAX
#define NGROUPS NGROUPS_MAX
#else
#define NGROUPS 20				/* Any better ideas? */
#endif
#endif
#endif
</PRE>

<H3>Definition of Max Domain Name Length</H3>
<PRE>
#ifndef MAXHOSTNAMELEN
#define MAXHOSTNAMELEN 64			/* Any better ideas? */
#endif
</PRE>

<H3>Macros for manipulating masks for select()</H3>
<PRE>
#ifdef SELECT
#ifndef FD_SET
typedef unsigned int fd_set;
#define FD_SET(fd,pmask) (*(pmask)) |=  (1&lt;&lt;(fd))
#define FD_CLR(fd,pmask) (*(pmask)) &amp;= ~(1&lt;&lt;(fd))
#define FD_ZERO(pmask)   (*(pmask))=0
#define FD_ISSET(fd,pmask) (*(pmask) &amp; (1&lt;&lt;(fd)))
#endif  /* FD_SET */
#endif  /* SELECT */
</PRE>

<H3>Macros for converting characters</H3>

<PRE>
#ifndef TOASCII
#define TOASCII(c) (c)
#define FROMASCII(c) (c)                                   
#endif
</PRE>

<H3>White Characters</H3>

Is character c white space? For speed, include all control characters

<PRE>
#define WHITE(c) (((unsigned char)(TOASCII(c))) &lt;= 32)
</PRE>

<H3>Cache file prefix</H3>

This is something onto which we tag something meaningful to make a cache
file name.  used in HTWSRC.c at least. If it is nor defined at all, caching
is turned off.

<PRE>
#ifndef CACHE_FILE_PREFIX
#ifdef unix
#define CACHE_FILE_PREFIX  "/usr/wsrc/"
#endif
#endif
</PRE>

<PRE>
#endif
</PRE>
End of system-specific file
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