1PERLBS2000(1) Perl Programmers Reference Guide PERLBS2000(1)
2
6 README.BS2000 - building and installing Perl for BS2000.
7
9 This document will help you Configure, build, test and install Perl on
10 BS2000 in the POSIX subsystem.
11
13 This is a ported perl for the POSIX subsystem in BS2000 VERSION OSD
14 V3.1A or later. It may work on other versions, but we started porting
15 and testing it with 3.1A and are currently using Version V4.0A.
16 You may need the following GNU programs in order to install perl:
18 gzip on BS2000
20 We used version 1.2.4, which could be installed out of the box with one
22 failure during 'make check'.
23 bison on BS2000
25 The yacc coming with BS2000 POSIX didn't work for us. So we had to use
27 bison. We had to make a few changes to perl in order to use the pure
28 (reentrant) parser of bison. We used version 1.25, but we had to add a
29 few changes due to EBCDIC. See below for more details concerning yacc.
30 Unpacking Perl Distribution on BS2000
32 To extract an ASCII tar archive on BS2000 POSIX you need an ASCII
34 filesystem (we used the mountpoint /usr/local/ascii for this). Now you
35 extract the archive in the ASCII filesystem without I/O-conversion:
36 cd /usr/local/ascii export IO_CONVERSION=NO gunzip <
38 /usr/local/src/perl.tar.gz ⎪ pax -r
39 You may ignore the error message for the first element of the archive
41 (this doesn't look like a tar archive / skipping to next file...), it's
42 only the directory which will be created automatically anyway.
43 After extracting the archive you copy the whole directory tree to your
45 EBCDIC filesystem. This time you use I/O-conversion:
46 cd /usr/local/src IO_CONVERSION=YES cp -r /usr/local/ascii/perl5.005_02
48 ./
49 Compiling Perl on BS2000
51 There is a "hints" file for BS2000 called hints.posix-bc (because
53 posix-bc is the OS name given by `uname`) that specifies the correct
54 values for most things. The major problem is (of course) the EBCDIC
55 character set. We have german EBCDIC version.
56 Because of our problems with the native yacc we used GNU bison to gen‐
58 erate a pure (=reentrant) parser for perly.y. So our yacc is really
59 the following script:
60 -----8<-----/usr/local/bin/yacc-----8<----- #! /usr/bin/sh
62 # Bison as a reentrant yacc:
64 # save parameters: params="" while [[ $# -gt 1 ]]; do
66 params="$params $1"
67 shift done
68 # add flag %pure_parser:
70 tmpfile=/tmp/bison.$$.y echo %pure_parser > $tmpfile cat $1 >> $tmpfile
72 # call bison:
74 echo "/usr/local/bin/bison --yacc $params $1\t\t\t(Pure Parser)"
76 /usr/local/bin/bison --yacc $params $tmpfile
77 # cleanup:
79 rm -f $tmpfile -----8<----------8<-----
81 We still use the normal yacc for a2p.y though!!! We made a softlink
83 called byacc to distinguish between the two versions:
84 ln -s /usr/bin/yacc /usr/local/bin/byacc
86 We build perl using GNU make. We tried the native make once and it
88 worked too.
89 Testing Perl on BS2000
91 We still got a few errors during "make test". Some of them are the
93 result of using bison. Bison prints parser error instead of syntax
94 error, so we may ignore them. The following list shows our errors,
95 your results may differ:
96 op/numconvert.......FAILED tests 1409-1440 op/regexp...........FAILED
98 tests 483, 496 op/regexp_noamp.....FAILED tests 483, 496 pragma/over‐
99 load.....FAILED tests 152-153, 170-171 pragma/warnings.....FAILED tests
100 14, 82, 129, 155, 192, 205, 207 lib/bigfloat........FAILED tests
101 351-352, 355 lib/bigfltpm........FAILED tests 354-355, 358 lib/com‐
102 plex.........FAILED tests 267, 487 lib/dumper..........FAILED tests 43,
103 45 Failed 11/231 test scripts, 95.24% okay. 57/10595 subtests failed,
104 99.46% okay.
105 Installing Perl on BS2000
107 We have no nroff on BS2000 POSIX (yet), so we ignored any errors while
109 installing the documentation.
110 Using Perl in the Posix-Shell of BS2000
112 BS2000 POSIX doesn't support the shebang notation
114 ("#!/usr/local/bin/perl"), so you have to use the following lines
115 instead:
116 : # use perl
118 eval 'exec /usr/local/bin/perl -S $0 ${1+"$@"}'
119 if $running_under_some_shell;
120 Using Perl in "native" BS2000
122 We don't have much experience with this yet, but try the following:
124 Copy your Perl executable to a BS2000 LLM using bs2cp:
126 "bs2cp /usr/local/bin/perl 'bs2:perl(perl,l)'"
128 Now you can start it with the following (SDF) command:
130 "/START-PROG FROM-FILE=*MODULE(PERL,PERL),PROG-MODE=*ANY,RUN-MODE=*ADV"
132 First you get the BS2000 commandline prompt ('*'). Here you may enter
134 your parameters, e.g. "-e 'print "Hello World!\\n";'" (note the double
135 backslash!) or "-w" and the name of your Perl script. Filenames start‐
136 ing with "/" are searched in the Posix filesystem, others are searched
137 in the BS2000 filesystem. You may even use wildcards if you put a "%"
138 in front of your filename (e.g. "-w checkfiles.pl %*.c"). Read your
139 C/C++ manual for additional possibilities of the commandline prompt
140 (look for PARAMETER-PROMPTING).
141 Floating point anomalies on BS2000
143 There appears to be a bug in the floating point implementation on
145 BS2000 POSIX systems such that calling int() on the product of a number
146 and a small magnitude number is not the same as calling int() on the
147 quotient of that number and a large magnitude number. For example, in
148 the following Perl code:
149 my $x = 100000.0;
151 my $y = int($x * 1e-5) * 1e5; # '0'
152 my $z = int($x / 1e+5) * 1e5; # '100000'
153 print "\$y is $y and \$z is $z\n"; # $y is 0 and $z is 100000
154 Although one would expect the quantities $y and $z to be the same and
156 equal to 100000 they will differ and instead will be 0 and 100000
157 respectively.
158 Using PerlIO and different encodings on ASCII and EBCDIC partitions
160 Since version 5.8 Perl uses the new PerlIO on BS2000. This enables you
162 using different encodings per IO channel. For example you may use
163 use Encode;
165 open($f, ">:encoding(ascii)", "test.ascii");
166 print $f "Hello World!\n";
167 open($f, ">:encoding(posix-bc)", "test.ebcdic");
168 print $f "Hello World!\n";
169 open($f, ">:encoding(latin1)", "test.latin1");
170 print $f "Hello World!\n";
171 open($f, ">:encoding(utf8)", "test.utf8");
172 print $f "Hello World!\n";
173 to get two files containing "Hello World!\n" in ASCII, EBCDIC, ISO
175 Latin-1 (in this example identical to ASCII) respective UTF-EBCDIC (in
176 this example identical to normal EBCDIC). See the documentation of
177 Encode::PerlIO for details.
178 As the PerlIO layer uses raw IO internally, all this totally ignores
180 the type of your filesystem (ASCII or EBCDIC) and the IO_CONVERSION
181 environment variable. If you want to get the old behavior, that the
182 BS2000 IO functions determine conversion depending on the filesystem
183 PerlIO still is your friend. You use IO_CONVERSION as usual and tell
184 Perl, that it should use the native IO layer:
185 export IO_CONVERSION=YES
187 export PERLIO=stdio
188 Now your IO would be ASCII on ASCII partitions and EBCDIC on EBCDIC
190 partitions. See the documentation of PerlIO (without "Encode::"!) for
191 further posibilities.
192
194 Thomas Dorner
195
197 INSTALL, perlport.
198 Mailing list
200 If you are interested in the VM/ESA, z/OS (formerly known as OS/390)
202 and POSIX-BC (BS2000) ports of Perl then see the perl-mvs mailing list.
203 To subscribe, send an empty message to perl-mvs-subscribe@perl.org.
204 See also:
206 http://lists.perl.org/showlist.cgi?name=perl-mvs
208 There are web archives of the mailing list at:
210 http://www.xray.mpe.mpg.de/mailing-lists/perl-mvs/
212 http://archive.develooper.com/perl-mvs@perl.org/
213
215 This document was originally written by Thomas Dorner for the 5.005
216 release of Perl.
217 This document was podified for the 5.6 release of perl 11 July 2000.
219perl v5.8.8 2006-01-07 PERLBS2000(1)