This document will help you Configure, build, test and install Perl on
OS/390 (aka z/OS) Unix System Services.
This document needs to be updated, but we don't know what it should
say. Please email comments to firstname.lastname@example.org
This is a fully ported Perl for OS/390 Version 2 Release 3, 5, 6, 7, 8,
and 9. It may work on other versions or releases, but those are the
ones we've tested it on.
You may need to carry out some system configuration tasks before
running the Configure script for Perl.
The z/OS Unix Tools and Toys list may prove helpful and contains links
to ports of much of the software helpful for building Perl.
Unpacking Perl distribution on OS/390
If using ftp remember to transfer the distribution in binary format.
Gunzip/gzip for OS/390 is discussed at:
to extract an ASCII tar archive on OS/390, try this:
pax -o to=IBM-1047,from=ISO8859-1 -r < latest.tar
zcat latest.tar.Z | pax -o to=IBM-1047,from=ISO8859-1 -r
If you get lots of errors of the form
tar: FSUM7171 ...: cannot set uid/gid: EDC5139I Operation not permitted.
you didn't read the above and tried to use tar instead of pax, you'll
first have to remove the (now corrupt) perl directory
rm -rf perl-...
and then use pax.
Setup and utilities for Perl on OS/390
Be sure that your yacc installation is in place including any necessary
parser template files. If you have not already done so then be sure to:
cp /samples/yyparse.c /etc
This may also be a good time to ensure that your /etc/protocol file and
either your /etc/resolv.conf or /etc/hosts files are in place. The IBM
make (as well as Perl and Apache) in the red-piece/book "Open Source
Software for OS/390 UNIX", SG24-5944-00 from IBM.
If instead of the recommended GNU make you would like to use the system
supplied make program then be sure to install the default rules file
properly via the shell command:
cp /samples/startup.mk /etc
and be sure to also set the environment variable _C89_CCMODE=1
(exporting _C89_CCMODE=1 is also a good idea for users of GNU make).
You might also want to have GNU groff for OS/390 installed before
running the "make install" step for Perl.
There is a syntax error in the /usr/include/sys/socket.h header file
that IBM supplies with USS V2R7, V2R8, and possibly V2R9. The problem
with the header file is that near the definition of the SO_REUSEPORT
constant there is a spurious extra '/' character outside of a comment
#define SO_REUSEPORT 0x0200 /* allow local address & port
reuse */ /
You could edit that header yourself to remove that last '/', or you
might note that Language Environment (LE) APAR PQ39997 describes the
problem and PTF's UQ46272 and UQ46271 are the (R8 at least) fixes and
apply them. If left unattended that syntax error will turn up as an
inability for Perl to build its "Socket" extension.
For successful testing you may need to turn on the sticky bit for your
world readable /tmp directory if you have not already done so (see man
Configure Perl on OS/390
Once you've unpacked the distribution, run "sh Configure" (see INSTALL
for a full discussion of the Configure options). There is a "hints"
file for os390 that specifies the correct values for most things. Some
things to watch out for include:
o A message of the form:
(I see you are using the Korn shell. Some ksh's blow up on Configure,
mainly on older exotic systems. If yours does, try the Bourne shell instead.)
is nothing to worry about at all.
o Some of the parser default template files in /samples are needed in
/etc. In particular be sure that you at least copy
/samples/yyparse.c to /etc before running Perl's Configure. This
step ensures successful extraction of EBCDIC versions of parser
files such as perly.c and perly.h. This has to be done before
running Configure the first time. If you failed to do so then the
easiest way to re-Configure Perl is to delete your misconfigured
see an error message similar to:
CEE3501S The module libperl.dll was not found.
From entry point __dllstaticinit at compile unit offset +00000194 at
then your LIBPATH does not have the location of libperl.x and
either libperl.dll or libperl.so in it. Add that directory to your
LIBPATH and proceed.
o Do not turn on the compiler optimization flag "-O". There is a bug
in either the optimizer or perl that causes perl to not work
correctly when the optimizer is on.
o Some of the configuration files in /etc used by the networking APIs
are either missing or have the wrong names. In particular, make
sure that there's either an /etc/resolv.conf or an /etc/hosts, so
that gethostbyname() works, and make sure that the file /etc/proto
has been renamed to /etc/protocol (NOT /etc/protocols, as used by
other Unix systems). You may have to look for things like HOSTNAME
and DOMAINORIGIN in the "//'SYS1.TCPPARMS(TCPDATA)'" PDS member in
order to properly set up your /etc networking files.
Build, Test, Install Perl on OS/390
if everything looks ok (see the next section for test/IVP diagnosis)
this last step may or may not require UID=0 privileges depending on how
you answered the questions that Configure asked and whether or not you
have write access to the directories you specified.
Build Anomalies with Perl on OS/390
"Out of memory!" messages during the build of Perl are most often fixed
by re building the GNU make utility for OS/390 from a source code kit.
Another memory limiting item to check is your MAXASSIZE parameter in
your 'SYS1.PARMLIB(BPXPRMxx)' data set (note too that as of V2R8
address space limits can be set on a per user ID basis in the USS
segment of a RACF profile). People have reported successful builds of
Perl with MAXASSIZE parameters as small as 503316480 (and it may be
possible to build Perl with a MAXASSIZE smaller than that).
Within USS your /etc/profile or $HOME/.profile may limit your ulimit
settings. Check that the following command returns reasonable values:
o A message of the form:
io/openpid...........CEE5210S The signal SIGHUP was received.
CEE5210S The signal SIGHUP was received.
CEE5210S The signal SIGHUP was received.
indicates that the t/io/openpid.t test of Perl has passed but done
so with extraneous messages on stderr from CEE.
o A message of the form:
lib/ftmp-security....File::Temp::_gettemp: Parent directory (/tmp/) is not safe
(sticky bit not set when world writable?) at lib/ftmp-security.t line 100
File::Temp::_gettemp: Parent directory (/tmp/) is not safe (sticky bit not
set when world writable?) at lib/ftmp-security.t line 100
indicates a problem with the permissions on your /tmp directory
within the HFS. To correct that problem issue the command:
chmod a+t /tmp
from an account with write access to the directory entry for /tmp.
o Out of Memory!
Recent perl test suite is quite memory hungry. In addition to the
comments above on memory limitations it is also worth checking for
_CEE_RUNOPTS in your environment. Perl now has (in miniperlmain.c)
a C #pragma to set CEE run options, but the environment variable
The C code asks for:
#pragma runopts(HEAP(2M,500K,ANYWHERE,KEEP,8K,4K) STACK(,,ANY,) ALL31(ON))
The important parts of that are the second argument (the increment)
to HEAP, and allowing the stack to be "Above the (16M) line". If
the heap increment is too small then when perl (for example loading
unicode/Name.pl) tries to create a "big" (400K+) string it cannot
fit in a single segment and you get "Out of Memory!" - even if
there is still plenty of memory available.
A related issue is use with perl's malloc. Perl's malloc uses
"sbrk()" to get memory, and "sbrk()" is limited to the first
allocation so in this case something like:
is needed to get through the test suite.
Installation Anomalies with Perl on OS/390
#!/path/to/perl script invocation. There is a PTF available from IBM
for V2R7 that will allow shell/kernel support for #!. USS releases
prior to V2R7 did not support the #! means of script invocation. If
you are running V2R6 or earlier then see:
head `whence perldoc`
for an example of how to use the "eval exec" trick to ask the shell to
have Perl run your scripts on those older releases of Unix System
If you are having trouble with square brackets then consider switching
your rlogin or telnet client. Try to avoid older 3270 emulators and
ISHELL for working with Perl on USS.
Floating Point Anomalies with Perl on OS/390
There appears to be a bug in the floating point implementation on S/390
systems such that calling int() on the product of a number and a small
magnitude number is not the same as calling int() on the quotient of
that number and a large magnitude number. For example, in the
following Perl code:
my $x = 100000.0;
my $y = int($x * 1e-5) * 1e5; # '0'
my $z = int($x / 1e+5) * 1e5; # '100000'
print "\$y is $y and \$z is $z\n"; # $y is 0 and $z is 100000
Although one would expect the quantities $y and $z to be the same and
equal to 100000 they will differ and instead will be 0 and 100000
The problem can be further examined in a roughly equivalent C program:
double x = 100000.0;
double y = 0.0;
double z = 0.0;
x = 100000.0 * 1e-5;
r1 = modf (x,&y);
x = 100000.0 / 1e+5;
r2 = modf (x,&z);
printf("y is %e and z is %e\n",y*1e5,z*1e5);
/* y is 0.000000e+00 and z is 1.000000e+05 (with c89) */
Modules and Extensions for Perl on OS/390
Pure pure (that is non xs) modules may be installed via the usual:
make -f Makefile.aperl inst_perl MAP_TARGET=perl
In most cases people have reported better results with GNU make rather
than the system's /bin/make program, whether for plain modules or for
xs based extensions.
If the make process encounters trouble with either compilation or
linking then try setting the _C89_CCMODE to 1. Assuming sh is your
login shell then run:
If tcsh is your login shell then use the setenv command.
David Fiander and Peter Prymmer with thanks to Dennis Longnecker and
William Raffloer for valuable reports, LPAR and PTF feedback. Thanks
to Mike MacIsaac and Egon Terwedow for SG24-5944-00. Thanks to Ignasi
Roca for pointing out the floating point problems. Thanks to John
Goodyear for dynamic loading help.
INSTALL, perlport, perlebcdic, ExtUtils::MakeMaker.
Mailing list for Perl on OS/390
If you are interested in the z/OS (formerly known as OS/390) and POSIX-
BC (BS2000) ports of Perl then see the perl-mvs mailing list. To
subscribe, send an empty message to email@example.com.
There are web archives of the mailing list at:
Updated 24 January 2001 to mention dynamic loading.
Updated 12 March 2001 to mention //'SYS1.TCPPARMS(TCPDATA)'.
perl v5.22.1 2018-11-19 PERLOS390(1)
Man Pages Copyright Respective Owners. Site Copyright (C) 1994 - 2019
All Rights Reserved.