System Dependencies

/*
**	(c) COPYRIGHT MIT 1995.
**	Please first read the full copyright statement in the file COPYRIGH.
*/
System-system differences for TCP include files and macros. This file includes for each system the files necessary for network and file I/O.

This module is a part of the Library of Common Code.

Authors

TBL
Tim Berners-Lee, W3 project, CERN, <timbl@info.cern.ch>
EvA
Eelco van Asperen <evas@cs.few.eur.nl>
MA
Marc Andreesen NCSA
MD
Mark Donszelmann <duns@vxcern.cern.ch>
AT
Aleksandar Totic <atotic@ncsa.uiuc.edu>
SCW
Susan C. Weber <sweber@kyle.eitech.com>
HF
Henrik Frystyk, <frystyk@dxcern.cern.ch>
CLB
Charlie Brooks, <cbrooks@osf.org>

History:

22 Feb 91
Written (TBL) as part of the WWW library.
16 Jan 92
PC code from (EvA)
22 Apr 93
Merged diffs bits from xmosaic release
29 Apr 93
Windows/NT code from (SCW)
29 Sep 93
Mar 96 CLB - changed SLEEP() macro for Windows/NT MSC compiler added BOOLEAN_DEFINED macro to avoid duplicate definitions in HUtils.h changed netread() macros to support reading from stdin,etc. as well as sockets. (Required for linemode browser to work).
#ifndef TCP_H
#define TCP_H

Default values

These values may be reset and altered by system-specific sections later on. There is also a bunch of defaults at the end and a section for ordinary BSD unix versions.
#define SELECT			/* Can handle >1 channel */
#define GOT_SYSTEM		/* Can call shell with string */
#define GOT_PASSWD		/* Can we use getpass() command */

Platform Specific Stuff

Information below this line is specific for most platforms. See also General Stuff

Macintosh - Think-C

Think-C is one development environment on the Mac.

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.

#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 		*/

#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 */

Macintosh - MPW

MPW is one development environment on the Mac.

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.

#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 */

#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 <MacSockDefs.h>
#endif /* NO_SOCKET_DEFS */

#include <socket.ext.h>
#include <string.h>

#endif /* applec MPW */

Big Blue - the world of incompatibility

IBM RS600

On the IBM RS-6000, AIX is almost Unix.

#ifdef _AIX
#define AIX
#endif
#ifdef AIX
#define NO_ALTZONE
#define unix
#endif

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

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

IBM VM-CMS, VM-XA Mainframes

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.
#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 <string.h>		/* 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 GOT_PIPE		/* Of sorts */
#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 <manifest.h>
#include <bsdtypes.h>
#include <stdefs.h>
#include <socket.h>
#include <in.h>
#include <inet.h>
#include <netdb.h>
#include <errno.h>	    /* independent */
extern char asciitoebcdic[], ebcdictoascii[];
#define TOASCII(c)   (c=='\n' ?  10  : ebcdictoascii[c])
#define FROMASCII(c) (c== 10  ? '\n' : asciitoebcdic[c])
#include <bsdtime.h>
#include <time.h>
#include <string.h>
#define INCLUDES_DONE
#define TCP_INCLUDES_DONE
#endif

IBM-PC running MS-DOS with SunNFS for TCP/IP

This code thanks to Eelco van Asperen <evas@cs.few.eur.nl>
#ifdef PCNFS
#include <sys/types.h>
#include <string.h>
#include <errno.h>	    /* independent */
#include <sys/time.h>	    /* independent */
#include <sys/stat.h>
#include <fcntl.h>	    /* In place of sys/param and sys/file */
#define INCLUDES_DONE
#define FD_SET(fd,pmask) (*(unsigned*)(pmask)) |=  (1<<(fd))
#define FD_CLR(fd,pmask) (*(unsigned*)(pmask)) &= ~(1<<(fd))
#define FD_ZERO(pmask)   (*(unsigned*)(pmask))=0
#define FD_ISSET(fd,pmask) (*(unsigned*)(pmask) & (1<<(fd)))
#define NO_GROUPS
#endif  /* PCNFS */

PC running Windows (16-bit)

Help provided by Susan C. Weber <sweber@kyle.eitech.com>, Paul Hounslow , and a lot of other PC people.
#ifdef _WINDOWS
#include <windows.h>
#include <fcntl.h>
#include <sys\types.h>
#include <sys\stat.h>

#define NETREAD(s,b,l)  recv((s),(b),(l),0)
#define NETWRITE(s,b,l) send((s),(b),(l),0)
#define NETCLOSE(s)     closesocket(s)
#define IOCTL(s,c,a)	ioctlsocket(s,c, (long *) a)

#define MKDIR(a,b)	mkdir((a))
#define REMOVE_FILE	remove
#define DEFAULT_SUFFIXES	"."

#include <io.h>
#include <string.h>
#include <process.h>
#include <time.h>
#include <direct.h>
#include <stdio.h>
#include <stdlib.h>
#include <winsock.h>

#ifdef _WINDLL
#define NO_STDIO				/* If we are making a DLL */
#endif

#define NO_PASSWD
#define NO_GETWD
#define HAS_GETCWD
#define NO_GETPASSWD
#define NO_GETDOMAINNAME
#define BOOLEAN_DEFINED

#define INCLUDES_DONE
#define TCP_INCLUDES_DONE

#define SOCKFD SOCKET			/* WinSocks socket descriptor */
#define INVSOC INVALID_SOCKET		/* WinSocks invalid socket */

#define DESIRED_WINSOCK_VERSION	0x0101  /* we'd like winsock ver 1.1... */
#define MINIMUM_WINSOCK_VERSION	0x0101  /* ...but we'll take ver 1.1 :) */

File Access

These next defintions are because the UNIX stuff is not supplied with BC4 (Paul Hounslow
#define NO_UNIX_IO

typedef unsigned long mode_t;

#define		_IFMT	0170000	/* type of file */
#define		_IFDIR	0040000	/* directory */
#define		_IFCHR	0020000	/* character special */
#define		_IFBLK	0060000	/* block special */
#define		_IFREG	0100000	/* regular */
#define		_IFLNK	0120000	/* symbolic link */
#define		_IFSOCK	0140000	/* socket */
#define		_IFIFO	0010000	/* fifo */

#define	S_ISUID		0004000	/* set user id on execution */
#define	S_ISGID		0002000	/* set group id on execution */
#define	S_ISVTX		0001000	/* save swapped text even after use */

#ifdef S_IREAD
#undef S_IREAD
#define	S_IREAD		0000400	/* read permission, owner */
#endif

#ifdef S_IWRITE
#undef S_IWRITE
#define	S_IWRITE 	0000200	/* write permission, owner */
#endif

#ifdef S_IEXEC
#undef S_IEXEC
#define	S_IEXEC		0000100	/* execute/search permission, owner */
#endif

#define	S_ENFMT 	0002000	/* enforcement-mode locking */

#ifdef S_IFMT
#undef S_IFMT
#define	S_IFMT		_IFMT
#endif

#ifdef S_IDIR
#undef S_IDIR
#define	S_IFDIR		_IFDIR
#endif

#ifdef S_IFCHR
#undef S_IFCHR
#define	S_IFCHR		_IFCHR
#endif

#ifdef S_IBLK
#undef S_IBLK
#define	S_IFBLK		_IFBLK
#endif

#ifdef S_IREG
#undef S_IREG
#define	S_IFREG		_IFREG
#endif

#define	S_IFLNK		_IFLNK

#ifdef S_IFIFO
#undef S_IFIFO
#define	S_IFIFO		_IFIFO
#endif

#define	S_IRWXU 	0000700	/* rwx, owner */
#define		S_IRUSR	0000400	/* read permission, owner */
#define		S_IWUSR	0000200	/* write permission, owner */
#define		S_IXUSR	0000100	/* execute/search permission, owner */
#define	S_IRWXG		0000070	/* rwx, group */
#define		S_IRGRP	0000040	/* read permission, group */
#define		S_IWGRP	0000020	/* write permission, grougroup */
#define		S_IXGRP	0000010	/* execute/search permission, group */
#define	S_IRWXO		0000007	/* rwx, other */
#define		S_IROTH	0000004	/* read permission, other */
#define		S_IWOTH	0000002	/* write permission, other */
#define		S_IXOTH	0000001	/* execute/search permission, other */

#define	S_ISREG(m)	(((m)&_IFMT) == _IFREG)

Errno and Return Codes

Winsock has its own errno codes and it returns them through WSAGetLastError(). However, it does also support BSD error codes, so we make a compromise.
/* extern int errno; */
#define socerrno WSAGetLastError()
#define ERRNO_DONE
Return code for socket functions. We can't use -1 as return value

#endif  /* WINDOWS */

Windows NT (32 bit)

Some special things for the 32 bit version...
#ifdef WIN32
#define EWOULDBLOCK	WSAEWOULDBLOCK
#define EINPROGRESS	WSAEINPROGRESS
#define ECONNREFUSED	WSAECONNREFUSED
#define ETIMEDOUT	WSAETIMEDOUT
#define ENETUNREACH	WSAENETUNREACH
#define EHOSTUNREACH	WSAEHOSTUNREACH
#define EHOSTDOWN	WSAEHOSTDOWN
#define EISCONN		WSAEISCONN

#undef NETREAD 
#undef NETWRITE 

#define NETREAD(s,b,l)  ((s) >= 10) ? recv((s),(b),(l),0) : read((s), (b), (l))
#define NETWRITE(s,b,l) ((s) >= 10) ? send((s),(b),(l),0) : write((s), (b), (l))
 
#undef NO_UNIX_IO	/* CLB NT has some Unix IO - must be more specific */

/* Some compilers do only define WIN32 and NOT _WINDOWS */
#undef  MKDIR
#define MKDIR(a,b) mkdir((a))  /* CLB NT has mkdir, but only one arg */

#define NO_GROUPS
#define NO_ALTZONE
#define SLEEP(n)	Sleep((n)*1000)
#endif /* WIN32 */

VAX/VMS

Under VMS, there are many versions of TCP-IP. Define one if you do not use Digital's UCX product:
UCX
DEC's "Ultrix connection" (default)
WIN_TCP
From Wollongong, now GEC software.
MULTINET
From SRI, now from TGV Inv.
DECNET
Cern's TCP socket emulation over DECnet
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.
#ifdef VMS 
#define CACHE_FILE_PREFIX	"SYS$LOGIN:Z_"
#define DEFAULT_SUFFIXES	"._"

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

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

#ifdef DECNET
#undef SELECT  /* not supported */
#define NETREAD(s,b,l)	((s)>10 ? recv((s),(b),(l),0) : read((s),(b),(l)))
#define NETWRITE(s,b,l)	((s)>10 ? send((s),(b),(l),0) : write((s),(b),(l)))
#define NETCLOSE(s) 	((s)>10 ? socket_close(s) : close(s))
#endif /* Decnet */
         
/*	Certainly this works for UCX and Multinet; not tried for Wollongong
*/
#ifdef MULTINET
#include <time.h>
#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 <types.h>
#include <errno.h>
#include <time.h>
#endif /* not MULTINET */

#include string

#ifndef STDIO_H
#include <stdio>
#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"

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

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

#define TCP_INCLUDES_DONE
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...
#define USE_DIRENT
#define GOT_READ_DIR
#include <dirent.h>
#define STRUCT_DIRENT struct dirent
#define R_OK 4
On VMS machines, the linker needs to be told to put global data sections into a data segment using these storage classes. (MarkDonszelmann)
#ifdef VAXC
#define GLOBALDEF globaldef
#define GLOBALREF globalref
#endif /*  VAXC */
#endif	/* vms */
On non-VMS machines, the GLOBALDEF and GLOBALREF storage types default to normal C storage types.
#ifndef GLOBALREF
#define GLOBALDEF
#define GLOBALREF extern
#endif
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.
#ifdef VMS
typedef unsigned long mode_t;
#define HTLstat HTStat
#else /* non VMS */
#define HTStat stat
#define HTLstat lstat
#endif /* non VMS */

Strftime and other time stuff

#ifdef VMS
#ifndef DECC
#define NO_STRFTIME
#endif
#define NO_MKTIME
#define NO_TIMEGM
#define NO_GMTOFF
#define NO_TIMEZONE
#endif

Definition of Errno

#ifdef VMS
#ifndef __DECC
extern int uerrno;	/* Deposit of error info (as per errno.h) */
extern volatile noshare int socket_errno; /* socket VMS error info 
                                          (used for translation of vmserrno) */
extern volatile noshare int vmserrno;	/* Deposit of VMS error info */
extern volatile noshare int errno;  /* noshare to avoid PSECT conflict */
#define ERRNO_DONE
#endif /* not DECC */
#endif /* VMS */

SCO ODT unix version

(by Brian King)
#ifdef sco
#include <grp.h>
#include <unistd.h>
#include <sys/fcntl.h>
#include <time.h>
#define USE_DIRENT
#define NEED_INITGROUPS
#define NO_GETDOMAINNAME
#endif

BSDi BSD/386 Unix

Specific stuff for BSDi BSD/386
#ifdef bsdi
#define NO_GETDOMAINNAME
#endif

MIPS unix

Mips hack (bsd4.3/sysV mixture...)
#ifdef Mips	/* Bruker */
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 S_ISDIR(m)      (((m)& S_IFMT) == S_IFDIR)
#define S_ISREG(m)      (((m)& S_IFMT) == S_IFREG)
#define WEXITSTATUS(s)	(((s).w_status >> 8) & 0377)
#define NO_STRFTIME

/* Mips can't uppercase non-alpha */
#define TOLOWER(c) (isupper(c) ? tolower(c) : (c))
#define TOUPPER(c) (islower(c) ? toupper(c) : (c))

File Permissions

#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 */

Solaris

Includes Linux (thanks to Rainer Klute) and other SVR5 based systems
#if defined(__svr4__) || defined(_POSIX_SOURCE) || defined(__hpux)

#ifdef __hpux
#define NO_ALTZONE
#endif

#ifdef UTS4				      /* UTS wants sys/types.h first */
#include <sys/types.h>
#endif

#include <unistd.h>

#ifdef UTS4
#include <sys/fcntl.h>
#define POSIXWAIT
#endif

#ifdef AIX						       /* Apple Unix */
#include <fcntl.h>
#else
#include <sys/fcntl.h>
#endif
This is for NCR 3000 and Pyramid that also are SVR4 systems. Thanks to Alex Podlecki, <a.podlecki@att.com>
#ifndef NGROUPS_MAX		
#include <limits.h>
#endif 

/* Pyramid and Mips can't uppercase non-alpha */
#ifdef pyramid
#define TOLOWER(c) (isupper(c) ? tolower(c) : (c))
#define TOUPPER(c) (islower(c) ? toupper(c) : (c))
#endif

getwd() is BSD. System V has getcwd()
#define NO_GETWD
#define HAS_GETCWD

#endif /* Solaris and SVR4 */

UTS 2.1 (BSD-like)

#ifdef UTS2
#include <time.h>
#include <fcntl.h>

#ifndef R_OK
#define R_OK 4
#endif
#define	NO_STRFTIME
#define	WEXITSTATUS(x)	((int)((x).w_T.w_Retcode))

#undef POSIXWAIT
#endif /* UTS2 */

OSF/1

#ifdef __osf__
#define USE_DIRENT
#define NO_TIMEZONE					 /* OSF/1 has gmtoff */
#endif /* OSF1 AXP */

Ultrix Decstation

#ifdef decstation
#define NO_TIMEZONE					/* Ultrix has gmtoff */
#endif

ISC 3.0

by Lauren Weinstein <lauren@vortex.com>.

#ifdef ISC3			/* Lauren */
#define USE_DIRENT
#define GOT_READ_DIR
#include <sys/ipc.h>
#include <sys/dirent.h>
#define direct dirent
#include <sys/unistd.h>
#define d_namlen d_reclen
#include <sys/limits.h>
typedef int mode_t;

#define SIGSTP

#define POSIXWAIT
#define _POSIX_SOURCE

#include <sys/types.h>
#include <sys/wait.h>
#include <net/errno.h>

#define _SYSV3
#include <time.h>

#include <sys/fcntl.h>
#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 */

NeXT

Next has a lot of strange changes in constants...
#ifdef NeXT
#include <sys/types.h>
#include <sys/stat.h>

typedef unsigned short mode_t;

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

#ifndef WEXITSTATUS
#define WEXITSTATUS(s) (((s).w_status >> 8) & 0377)
#endif

#ifndef O_NONBLOCK
#define O_NONBLOCK	O_NDELAY
#endif

#define NO_TIMEZONE					  /* next has gmtoff */

File Permissions for NeXT

#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 */

A/UX Apple UNIX

Kelly King, bhutab@apple.com and Jim Jagielski, jim@jagubox.gsfc.nasa.gov
#ifdef _AUX
#include <time.h>
#define WEXITSTATUS(s) (((s).w_status >> 8) & 0377)
#define NO_STRFTIME
#endif

Regular BSD unix versions

These are a default unix where not already defined specifically.
#ifndef INCLUDES_DONE

#include <sys/types.h>
#include <string.h>

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

#ifdef SUNOS
#define NO_TIMEZONE
#define NO_MKTIME
#undef HAVE_STRERROR
#endif

Directory reading stuff - BSD or SYS V

#ifdef unix                    	  /* if this is to compile on a UNIX machine */

#define GOT_PIPE				        /* We do have a pipe */

#define GOT_READ_DIR         /* if directory reading functions are available */
#include <pwd.h>
#include <grp.h>

#include <stdio.h>

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

#ifdef SOLARIS
#include <sys/fcntl.h>
#include <limits.h>
#endif
#ifndef FNDELAY
#define FNDELAY		O_NDELAY
#endif

#endif /* unix */

General Stuff

Information below this line is general for most platforms.

See also Platform Specific Stuff

Sleep System Call

Some systems use milliseconds instead of seconds
#ifndef SLEEP
#define SLEEP(n)	sleep(n)
#endif

SOCKS

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

Network Family

#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

Default Values of Network Access

#ifndef NETCLOSE
#define NETCLOSE close		/* Routine to close a TCP-IP socket */
#endif

#ifndef NETREAD
#define NETREAD  read		/* Routine to read from a TCP-IP socket	*/
#endif

#ifndef NETWRITE
#define NETWRITE write		/* Routine to write to a TCP-IP socket */
#endif

Include files for TCP

#ifndef TCP_INCLUDES_DONE
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>		       /* Must be after netinet/in.h */
#include <netdb.h>
#define TCP_INCLUDES_DONE
#endif

Definition of errno and Return Code

This is the definition of error codes and the corresponding string constants. If we do not have the strerror function then try the error list table.
#ifndef ERRNO_DONE
extern int errno;
#define socerrno errno
#endif

#ifndef HAVE_STRERROR				  /* Otherwise use the table */
extern char *sys_errlist[];
extern int sys_nerr;
#endif

Definition of Socket Desrciptores

This is necessary in order to support Windows NT...
#ifndef SOCKFD
#define SOCKFD int		/* Unix like socket descriptor */
#define INVSOC -1		/* Unix invalid socket */
#endif

Rough estimate of max path length

#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 */

Definition of NGROUPS

#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

Definition of Standard File Descriptors

If we don't have stderr etc. then set STDIN_FILENO to a dummy value. However, the value IS used!
#ifdef NO_STDIO
#define STDIN_FILENO	-1
#else
#ifndef STDIN_FILENO
#define STDIN_FILENO	0
#endif
#ifndef STDOUT_FILENO
#define STDOUT_FILENO	1
#endif
#ifndef STDERR_FILENO
#define STDERR_FILENO	2
#endif
#endif

Definition of Max Domain Name Length

#ifndef MAXHOSTNAMELEN
#define MAXHOSTNAMELEN 64			/* Any better ideas? */
#endif

File/Directory Management

#ifndef MKDIR
#define MKDIR(a,b)	mkdir((a), (b))
#endif

#ifndef REMOVE_FILE
#define REMOVE_FILE	unlink
#endif

#ifndef DEFAULT_SUFFIXES
#define DEFAULT_SUFFIXES	".,_"
#endif

Macros for manipulating masks for select()

#ifdef SELECT
#ifndef FD_SET
typedef unsigned int fd_set;
#define FD_SET(fd,pmask) (*(pmask)) |=  (1<<(fd))
#define FD_CLR(fd,pmask) (*(pmask)) &= ~(1<<(fd))
#define FD_ZERO(pmask)   (*(pmask))=0
#define FD_ISSET(fd,pmask) (*(pmask) & (1<<(fd)))
#endif  /* FD_SET */
#endif  /* SELECT */

Macros for converting characters

#ifndef TOASCII
#define TOASCII(c) (c)
#define FROMASCII(c) (c)                                   
#endif

Cache file prefix

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.
#ifndef CACHE_FILE_PREFIX
#ifdef unix
#define CACHE_FILE_PREFIX  "/usr/wsrc/"
#endif
#endif
#endif
End of system-specific file