Annotation of libwww/Library/src/wwwsys.html, revision 2.8

2.7       timbl       1: <HTML>
                      2: <HEAD>
2.2       timbl       3: <TITLE>System dependencies in the W3 library</TITLE>
2.7       timbl       4: <NEXTID N="z4">
                      5: </HEAD>
2.2       timbl       6: <BODY>
                      7: <H1>System Dependencies</H1>System-system differences for TCP
                      8: include files and macros. This file
                      9: includes for each system the files
                     10: necessary for network and file I/O.
                     11: <H3>Authors</H3>
                     12: <DL>
                     13: <DT>TBL
                     14: <DD> Tim Berners-Lee, W3 project,
                     15: CERN, &lt;timbl@info.cern.ch>
                     16: <DT>EvA
                     17: <DD> Eelco van Asperen &lt;evas@cs.few.eur.nl>
                     18: <DT>MA
                     19: <DD> Marc Andreesen NCSA
2.7       timbl      20: <DT>MD
                     21: <DD> Mark Donszelmann &lt;duns@vxcern.cern.ch>
2.2       timbl      22: <DT>AT
2.4       timbl      23: <DD> Aleksandar Totic &lt;atotic@ncsa.uiuc.edu>
                     24: <DT>SCW
2.5       timbl      25: <DD> Susan C. Weber &lt;sweber@kyle.eitech.com>
2.2       timbl      26: </DL>
                     27: 
                     28: <H3>History:</H3>
                     29: <DL>
                     30: <DT>22 Feb 91
                     31: <DD> Written (TBL) as part of
                     32: the WWW library.
                     33: <DT>16 Jan 92
2.7       timbl      34: <DD> PC code from (EvA)
2.2       timbl      35: <DT>22 Apr 93
                     36: <DD> Merged diffs bits from
                     37: xmosaic release
2.4       timbl      38: <DT>29 Apr 93
2.7       timbl      39: <DD> Windows/NT code from (SCW)
                     40: <DT>29 Sep 93
                     41: <DD> VMS fixes (MD)
2.2       timbl      42: </DL>
                     43: 
2.1       timbl      44: <PRE>
                     45: #ifndef TCP_H
                     46: #define TCP_H
                     47: 
2.2       timbl      48: </PRE>
                     49: <H2>Default values</H2>These values may be reset and altered
                     50: by system-specific sections later
                     51: on.  there are also a bunch of <A
2.7       timbl      52: NAME="z2" HREF="#z1">defaults
2.3       timbl      53: at the end</A> .
2.2       timbl      54: <PRE>/* Default values of those: */
2.1       timbl      55: #define NETCLOSE close     /* Routine to close a TCP-IP socket         */
                     56: #define NETREAD  read      /* Routine to read from a TCP-IP socket     */
                     57: #define NETWRITE write     /* Routine to write to a TCP-IP socket      */
                     58: 
                     59: /* Unless stated otherwise, */
2.2       timbl      60: #define SELECT                 /* Can handle >1 channel.               */
2.1       timbl      61: #define GOT_SYSTEM             /* Can call shell with string           */
                     62: 
                     63: #ifdef unix
                     64: #define GOT_PIPE
                     65: #endif
                     66: #ifdef VM
                     67: #define GOT_PIPE               /* Of sorts */
                     68: #endif
                     69: 
                     70: #ifdef DECNET
                     71: typedef struct sockaddr_dn SockA;  /* See netdnet/dn.h or custom vms.h */
                     72: #else /* Internet */
                     73: typedef struct sockaddr_in SockA;  /* See netinet/in.h */
                     74: #endif
                     75: 
                     76: 
2.2       timbl      77: </PRE>
                     78: <H2>Macintosh - Think-C</H2>Think-C is one development environment
                     79: on the Mac.<P>
                     80: We recommend that you compile with
                     81: 4-byte ints to be compatible with
                     82: MPW C.  We used Tom Milligan's s_socket
                     83: library which was written for 4 byte
                     84: int, and the MacTCP library assumes
                     85: 4-byte int.
                     86: <PRE>#ifdef THINK_C
2.1       timbl      87: #undef GOT_SYSTEM
                     88: #define DEBUG                  /* Can't put it on the CC command line  */
                     89: #define NO_UNIX_IO             /* getuid() missing                     */
                     90: #define NO_GETPID              /* getpid() does not exist              */
                     91: #define NO_GETWD               /* getwd() does not exist               */
                     92: 
                     93: #undef NETCLOSE                    /* Routine to close a TCP-IP socket         */
                     94: #undef NETREAD             /* Routine to read from a TCP-IP socket     */
                     95: #undef NETWRITE            /* Routine to write to a TCP-IP socket      */
                     96: #define NETCLOSE s_close    /* Routine to close a TCP-IP socket                */
                     97: #define NETREAD  s_read            /* Routine to read from a TCP-IP socket     */
                     98: #define NETWRITE s_write    /* Routine to write to a TCP-IP socket     */
                     99: 
                    100: #define bind s_bind        /* Funny names presumably to prevent clashes */
                    101: #define connect s_connect
                    102: #define accept s_accept
                    103: #define listen s_listen
                    104: #define socket s_socket
                    105: #define getsockname s_getsockname
                    106: 
                    107: /* The function prototype checking is better than the include files
                    108: */
                    109: 
                    110: extern s_close(int s);
                    111: extern s_read(int s, char *buffer, int buflen);
                    112: extern s_write(int s, const char *buffer, int buflen);
                    113: 
                    114: extern bind(int s, struct sockaddr *name, int namelen);
                    115: extern accept(int s, struct sockaddr *addr, int *addrlen);
                    116: extern listen(int s, int qlen);
                    117: extern connect(int s, struct sockaddr *addr, int addrlen);
                    118: 
                    119: extern s_socket(int domain, int type, int protocol);
                    120: extern s_getsockname(int s, struct sockaddr *name, int *namelen);
                    121: extern struct hostent *gethostent(const char * name);
                    122: extern unsigned long inet_addr(const char * name);
                    123: 
                    124: #endif /* THINK_C */
                    125: 
                    126: 
2.2       timbl     127: </PRE>
                    128: <H2>Macintosh - MPW</H2>MPW is one development environment
                    129: on the Mac.<P>
                    130: This entry was created by Aleksandar
                    131: Totic (atotic@ncsa.uiuc.edu) this
                    132: file is compatible with sockets package
                    133: released by NCSA.  One major conflict
                    134: is that this library redefines write/read/etc
                    135: as macros.  In some of HTML code
                    136: these macros get executed when they
                    137: should not be. Such files should
                    138: define NO_SOCKET_DEFS on top. This
                    139: is a temporary hack.
                    140: <PRE>#ifdef applec                     /* MPW  */
                    141: #undef GOT_SYSTEM
                    142: #define DEBUG                  /* Can't put it on the CC command line */
                    143: #define NO_UNIX_IO             /* getuid() missing
                    144: */
                    145: #define NO_GETPID              /* getpid() does not exist
                    146: */
                    147: #define NO_GETWD               /* getwd() does not exist
                    148: */
                    149: 
                    150: #undef NETCLOSE                    /* Routine to close a TCP-IP socket */
                    151: #undef NETREAD             /* Routine to read from a TCP-IP socket */
                    152: #undef NETWRITE            /* Routine to write to a TCP-IP socket */
                    153: #define NETCLOSE s_close    /* Routine to close a TCP-IP socket */
                    154: #define NETREAD  s_read            /* Routine to read from a TCP-IP socket */
                    155: #define NETWRITE s_write    /* Routine to write to a TCP-IP socket */
                    156: #define _ANSI_SOURCE
                    157: #define GUI
                    158: #define LINEFEED 10
                    159: #define ANON_FTP_HOSTNAME
                    160: #ifndef NO_SOCKET_DEFS
                    161: #include &lt;MacSockDefs.h>
                    162: #endif
                    163: 
                    164: #include &lt;socket.ext.h>
                    165: #include &lt;string.h>
                    166: 
                    167: #endif                 /* MPW */
                    168: 
                    169: 
                    170: 
2.1       timbl     171: #ifndef STDIO_H
2.2       timbl     172: #include &lt;stdio.h>
2.1       timbl     173: #define STDIO_H
                    174: #endif
                    175: 
2.2       timbl     176: </PRE>
2.6       timbl     177: <H2>Big Blue - the world of incompatibility</H2>
                    178: <H2>IBM RS600</H2>On the IBM RS-6000, AIX is almost
                    179: Unix.
                    180: <PRE>#ifdef _AIX
2.2       timbl     181: #define AIX
                    182: #endif
2.1       timbl     183: #ifdef AIX
                    184: #define unix
                    185: #endif
                    186: 
2.2       timbl     187: /*    AIX 3.2
                    188: **    -------
                    189: */
                    190: 
                    191: #ifdef _IBMR2
2.6       timbl     192: #define USE_DIRENT             /* sys V style directory open */
2.2       timbl     193: #endif
                    194: 
                    195: 
                    196: </PRE>
2.4       timbl     197: <H2>IBM VM-CMS, VM-XA Mainframes</H2>MVS is compiled as for VM. MVS has
                    198: no unix-style I/O.  The command line
                    199: compile options seem to come across
                    200: in lower case.
                    201: <PRE>#ifdef mvs
2.1       timbl     202: #define MVS
                    203: #endif
                    204: 
                    205: #ifdef MVS
                    206: #define VM
                    207: #endif
                    208: 
                    209: #ifdef NEWLIB
                    210: #pragma linkage(newlib,OS)     /* Enables recursive NEWLIB */
                    211: #endif
                    212: 
                    213: /*     VM doesn't have a built-in predefined token, so we cheat: */
                    214: #ifndef VM
2.2       timbl     215: #include &lt;string.h>         /* For bzero etc - not  VM */
                    216: #endif
                    217: 
                    218: /*     Note:   All include file names must have 8 chars max (+".h")
                    219: **
                    220: **     Under VM, compile with "(DEF=VM,SHORT_NAMES,DEBUG)"
                    221: **
                    222: **     Under MVS, compile with "NOMAR DEF(MVS)" to get rid of 72 char margin
                    223: **       System include files TCPIP and COMMMAC neeed line number removal(!)
                    224: */
                    225: 
                    226: #ifdef VM                      /* or MVS -- see above. */
                    227: #define NOT_ASCII              /* char type is not ASCII */
                    228: #define NO_UNIX_IO             /* Unix I/O routines are not supported */
                    229: #define NO_GETPID              /* getpid() does not exist */
                    230: #define NO_GETWD               /* getwd() does not exist */
                    231: #ifndef SHORT_NAMES
                    232: #define SHORT_NAMES            /* 8 character uniqueness for globals */
                    233: #endif
                    234: #include &lt;manifest.h>                                                           
                    235: #include &lt;bsdtypes.h>                                                           
                    236: #include &lt;stdefs.h>                                                             
                    237: #include &lt;socket.h>                                                             
                    238: #include &lt;in.h>
                    239: #include &lt;inet.h>
                    240: #include &lt;netdb.h>                                                                 
                    241: #include &lt;errno.h>      /* independent */
                    242: extern char asciitoebcdic[], ebcdictoascii[];
                    243: #define TOASCII(c)   (c=='\n' ?  10  : ebcdictoascii[c])
                    244: #define FROMASCII(c) (c== 10  ? '\n' : asciitoebcdic[c])                                   
                    245: #include &lt;bsdtime.h>
                    246: #include &lt;time.h>
                    247: #include &lt;string.h>                                                            
                    248: #define INCLUDES_DONE
                    249: #define TCP_INCLUDES_DONE
2.1       timbl     250: #endif
                    251: 
                    252: 
2.2       timbl     253: </PRE>
                    254: <H2>IBM-PC running MS-DOS with SunNFS
                    255: for TCP/IP</H2>This code thanks to Eelco van Asperen
2.3       timbl     256: &lt;evas@cs.few.eur.nl>
                    257: <PRE>#ifdef PCNFS
                    258: #include &lt;sys/types.h>
2.2       timbl     259: #include &lt;string.h>
                    260: #include &lt;errno.h>      /* independent */
                    261: #include &lt;sys/time.h>           /* independent */
                    262: #include &lt;sys/stat.h>
                    263: #include &lt;fcntl.h>      /* In place of sys/param and sys/file */
                    264: #define INCLUDES_DONE
                    265: #define FD_SET(fd,pmask) (*(unsigned*)(pmask)) |=  (1&lt;&lt;(fd))
                    266: #define FD_CLR(fd,pmask) (*(unsigned*)(pmask)) &amp;= ~(1&lt;&lt;(fd))
                    267: #define FD_ZERO(pmask)   (*(unsigned*)(pmask))=0
                    268: #define FD_ISSET(fd,pmask) (*(unsigned*)(pmask) &amp; (1&lt;&lt;(fd)))
                    269: #endif  /* PCNFS */
                    270: 
2.4       timbl     271: </PRE>
                    272: <H2>IBM-PC running Windows NT</H2>These parameters providede by  Susan
                    273: C. Weber &lt;sweber@kyle.eitech.com>.
                    274: <PRE>#ifdef _WINDOWS
                    275: #include "fcntl.h"                     /* For HTFile.c */
                    276: #include "sys\types.h"                 /* For HTFile.c */
                    277: #include "sys\stat.h"                  /* For HTFile.c */
                    278: 
                    279: #undef NETREAD
                    280: #undef NETWRITE
                    281: #undef NETCLOSE
                    282: #define NETREAD(s,b,l) ((s)>10 ? recv((s),(b),(l),0) : read((s),(b),(l)))
                    283: #define NETWRITE(s,b,l)        ((s)>10 ? send((s),(b),(l),0) : write((s),(b),(l)))
                    284: #define NETCLOSE(s)    ((s)>10 ? closesocket(s) : close(s))
                    285: #include &lt;io.h>
                    286: #include &lt;string.h>
                    287: #include &lt;process.h>
                    288: #include &lt;time.h>
                    289: #include &lt;direct.h>
                    290: #include &lt;stdio.h>
                    291: #include &lt;winsock.h>
                    292: typedef struct sockaddr_in SockA;  /* See netinet/in.h */
                    293: #define INCLUDES_DONE
                    294: #define TCP_INCLUDES_DONE
                    295: #endif  /* WINDOWS */
                    296:  
2.2       timbl     297: 
                    298: 
                    299: </PRE>
2.4       timbl     300: <H2>VAX/VMS</H2>Under VMS, there are many versions
                    301: of TCP-IP. Define one if you do not
                    302: use Digital's UCX product:
                    303: <DL>
                    304: <DT>UCX
2.5       timbl     305: <DD> DEC's "Ultrix connection" (default)
2.4       timbl     306: <DT>WIN_TCP
2.5       timbl     307: <DD> From Wollongong, now GEC
                    308: software.
2.4       timbl     309: <DT>MULTINET
2.5       timbl     310: <DD> From SRI, now from TGV Inv.
2.4       timbl     311: <DT>DECNET
2.5       timbl     312: <DD> Cern's TCP socket emulation
2.4       timbl     313: over DECnet
                    314: </DL>
                    315: The last three do not interfere with
                    316: the unix i/o library, and so they
                    317: need special calls to read, write
                    318: and close sockets. In these cases
                    319: the socket number is a VMS channel
                    320: number, so we make the @@@ HORRIBLE
                    321: @@@ assumption that a channel number
                    322: will be greater than 10 but a unix
                    323: file descriptor less than 10.  It
                    324: works.
                    325: <PRE>#ifdef vms
2.7       timbl     326: #define CACHE_FILE_PREFIX  "SYS$LOGIN:Z_"
                    327: 
                    328: #ifdef WIN_TCP
2.1       timbl     329: #undef NETREAD
                    330: #undef NETWRITE
                    331: #undef NETCLOSE
2.2       timbl     332: #define NETREAD(s,b,l) ((s)>10 ? netread((s),(b),(l)) : read((s),(b),(l)))
                    333: #define NETWRITE(s,b,l)        ((s)>10 ? netwrite((s),(b),(l)) : write((s),(b),(l)))
                    334: #define NETCLOSE(s)    ((s)>10 ? netclose(s) : close(s))
2.1       timbl     335: #endif
                    336: 
                    337: #ifdef MULTINET
                    338: #undef NETCLOSE
                    339: #undef NETREAD
                    340: #undef NETWRITE
2.2       timbl     341: #define NETREAD(s,b,l) ((s)>10 ? socket_read((s),(b),(l)) : read((s),(b),(l)))
                    342: #define NETWRITE(s,b,l)        ((s)>10 ? socket_write((s),(b),(l)) : \
2.1       timbl     343:                                write((s),(b),(l)))
2.2       timbl     344: #define NETCLOSE(s)    ((s)>10 ? socket_close(s) : close(s))
2.1       timbl     345: #endif
                    346: 
                    347: #ifdef DECNET
                    348: #undef SELECT  /* not supported */
                    349: #undef NETREAD
                    350: #undef NETWRITE
                    351: #undef NETCLOSE
2.2       timbl     352: #define NETREAD(s,b,l) ((s)>10 ? recv((s),(b),(l),0) : read((s),(b),(l)))
                    353: #define NETWRITE(s,b,l)        ((s)>10 ? send((s),(b),(l),0) : write((s),(b),(l)))
                    354: #define NETCLOSE(s)    ((s)>10 ? socket_close(s) : close(s))
2.1       timbl     355: #endif /* Decnet */
                    356: 
                    357: /*     Certainly this works for UCX and Multinet; not tried for Wollongong
                    358: */
                    359: #ifdef MULTINET
                    360: #include "multinet_root:[multinet.include.sys]types.h"
                    361: #include "multinet_root:[multinet.include]errno.h"
                    362: #include "multinet_root:[multinet.include.sys]time.h"
                    363: #else
                    364: #include types
                    365: #include errno
                    366: #include time
                    367: #endif /* multinet */
                    368: 
                    369: #include string
                    370: 
                    371: #ifndef STDIO_H
                    372: #include stdio
                    373: #define STDIO_H
                    374: #endif
                    375: 
                    376: #include file
                    377: 
                    378: #ifndef DECNET  /* Why is it used at all ? Types conflict with "types.h" */
                    379: #include unixio
                    380: #endif
                    381: 
                    382: #define INCLUDES_DONE
                    383: 
                    384: #ifdef MULTINET  /* Include from standard Multinet directories */
                    385: #include "multinet_root:[multinet.include.sys]socket.h"
                    386: #ifdef __TIME_LOADED  /* defined by sys$library:time.h */
                    387: #define __TIME  /* to avoid double definitions in next file */
                    388: #endif
                    389: #include "multinet_root:[multinet.include.netinet]in.h"
                    390: #include "multinet_root:[multinet.include.arpa]inet.h"
                    391: #include "multinet_root:[multinet.include]netdb.h"
                    392: 
                    393: #else  /* not multinet */
                    394: #ifdef DECNET
                    395: #include "types.h"  /* for socket.h */
                    396: #include "socket.h"
                    397: #include "dn"
                    398: #include "dnetdb"
                    399: /* #include "vms.h" */
                    400: 
                    401: #else /* UCX or WIN */
                    402: #include socket
                    403: #include in
                    404: #include inet
                    405: #include netdb
                    406: 
                    407: #endif  /* not DECNET */
                    408: #endif  /* of Multinet or other TCP includes */
                    409: 
                    410: #define TCP_INCLUDES_DONE
                    411: 
2.7       timbl     412: </PRE>On VMS machines, the linker needs
                    413: to be told to put global data sections
                    414: into a data segment using these storage
                    415: classes. (MarkDonszelmann)
                    416: <PRE>#ifdef VAXC
                    417: #define GLOBALDEF globaldef
                    418: #define GLOBALREF globalref
                    419: #endif /*  VAXC */
                    420: 
2.1       timbl     421: #endif /* vms */
                    422: 
2.7       timbl     423: </PRE>On non-VMS machines, the GLOBALDEF
                    424: and GLOBALREF storage types default
                    425: to normal C storage types.
                    426: <PRE>#ifndef GLOBALREF
                    427: #define GLOBALDEF
                    428: #define GLOBALREF extern
                    429: #endif
                    430: 
2.1       timbl     431: 
                    432: 
2.2       timbl     433: </PRE>
                    434: <H2>SCO ODT unix version</H2>
                    435: <PRE>
                    436: #ifdef sco
                    437: #include &lt;sys/fcntl.h>
                    438: #define USE_DIRENT
2.1       timbl     439: #endif
                    440: 
2.2       timbl     441: </PRE>
                    442: <H2>MIPS unix</H2>
                    443: <PRE>/* Mips hack (bsd4.3/sysV mixture...) */
2.1       timbl     444: 
                    445: #ifdef mips
                    446: extern int errno;
                    447: #endif
                    448: 
2.8     ! timbl     449: </PRE>
        !           450: <H2>OSF/1</H2>
        !           451: <PRE>#ifdef __osf__
        !           452: #define USE_DIRENT
        !           453: #endif /* OSF1 AXP */
        !           454: 
2.2       timbl     455: 
                    456: </PRE>
                    457: <H2>Regular BSD unix versions</H2>These are a default unix where not
                    458: already defined specifically.
                    459: <PRE>#ifndef INCLUDES_DONE
                    460: #include &lt;sys/types.h>
                    461: /* #include &lt;streams/streams.h>                     not ultrix */
                    462: #include &lt;string.h>
                    463: 
                    464: #include &lt;errno.h>      /* independent */
                    465: #include &lt;sys/time.h>           /* independent */
                    466: #include &lt;sys/stat.h>
                    467: #include &lt;sys/param.h>
                    468: #include &lt;sys/file.h>           /* For open() etc */
2.1       timbl     469: #define INCLUDES_DONE
                    470: #endif /* Normal includes */
                    471: 
2.2       timbl     472: /*                     Directory reading stuff - BSD or SYS V
                    473: */
2.1       timbl     474: #ifdef unix                    /* if this is to compile on a UNIX machine */
                    475: #define GOT_READ_DIR 1    /* if directory reading functions are available */
2.2       timbl     476: #ifdef USE_DIRENT             /* sys v version */
                    477: #include &lt;dirent.h>
                    478: #define direct dirent
                    479: #else
                    480: #include &lt;sys/dir.h>
2.1       timbl     481: #endif
2.2       timbl     482: #if defined(sun) &amp;&amp; defined(__svr4__)
                    483: #include &lt;sys/fcntl.h>
                    484: #include &lt;limits.h>
                    485: #endif
                    486: #endif
2.1       timbl     487: 
2.2       timbl     488: </PRE>
                    489: <H2><A
2.7       timbl     490: NAME="z1">Defaults</A></H2>
2.2       timbl     491: <H3>Include files for TCP</H3>
                    492: <PRE>#ifndef TCP_INCLUDES_DONE
                    493: #include &lt;sys/socket.h>
                    494: #include &lt;netinet/in.h>
                    495: #ifndef __hpux /* this may or may not be good -marc */
                    496: #include &lt;arpa/inet.h>          /* Must be after netinet/in.h */
                    497: #endif
                    498: #include &lt;netdb.h>
2.1       timbl     499: #endif /* TCP includes */
                    500: 
                    501: 
2.2       timbl     502: </PRE>
                    503: <H3>Macros for manipulating masks for
                    504: select()</H3>
                    505: <PRE>#ifdef SELECT
2.1       timbl     506: #ifndef FD_SET
                    507: typedef unsigned int fd_set;
2.2       timbl     508: #define FD_SET(fd,pmask) (*(pmask)) |=  (1&lt;&lt;(fd))
                    509: #define FD_CLR(fd,pmask) (*(pmask)) &amp;= ~(1&lt;&lt;(fd))
2.1       timbl     510: #define FD_ZERO(pmask)   (*(pmask))=0
2.2       timbl     511: #define FD_ISSET(fd,pmask) (*(pmask) &amp; (1&lt;&lt;(fd)))
2.1       timbl     512: #endif  /* FD_SET */
                    513: #endif  /* SELECT */
                    514: 
2.2       timbl     515: </PRE>
                    516: <H3><A
2.8     ! timbl     517: NAME="z0">M</A>acros for converting characters</H3>
2.2       timbl     518: <PRE>#ifndef TOASCII
2.1       timbl     519: #define TOASCII(c) (c)
                    520: #define FROMASCII(c) (c)                                   
2.5       timbl     521: #endif
                    522: 
                    523: </PRE>
                    524: <H3>Cache file prefix</H3>This is something onto which we tag
                    525: something meaningful to make a cache
                    526: file name.  used in HTWSRC.c at least.
2.6       timbl     527: If it is nor defined at all, caching
2.5       timbl     528: is turned off.
                    529: <PRE>#ifndef CACHE_FILE_PREFIX
                    530: #ifdef unix
2.6       timbl     531: #define CACHE_FILE_PREFIX  "/usr/wsrc/"
2.5       timbl     532: #endif
2.1       timbl     533: #endif
                    534: 
2.2       timbl     535: #endif /* TCP_H */
                    536: 
                    537: 
2.1       timbl     538: 
2.3       timbl     539: </PRE>end of system-specific file</BODY>
2.7       timbl     540: </HTML>

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