Perl 5 README file for the Stratus VOS operating system. Paul Green (Paul_Green@stratus.com) February 3, 2000 Introduction ------------ This is a port of Perl version 5, revision 005-63, to VOS. Perl is a scripting or macro language that is popular on many systems. See your local computer bookstore for a number of good books on Perl. Most of the Perl features should work on VOS. However, any attempt by perl.pm to call the following unimplemented POSIX functions will result in an error message and an immediate and fatal call to the VOS debugger. They are "dup", "fork", and "waitpid". The lack of these functions pretty much prevents you from starting VOS commands and grabbing their output in perl. The workaround is to run the commands outside of perl, then have perl process the output file. Compiling Perl 5 on VOS ----------------------- Before you can build Perl 5 on VOS, you need to have or acquire the following additional items. 1. The VOS Standard C Compiler and Runtime, or the VOS Standard C Cross-Compiler. This is a standard Stratus product. 2. The VOS OS TCP/IP product set. While the necessary header files are included with VOS POSIX.1, you still need the appropriate object files in order to bind perl.pm. This is a standard Stratus product. 3. The VOS POSIX.1 environment. As of this writing, this is available on the VOS FTP site. Login anonymously to ftp.stratus.com and get the file /pub/vos/alpha/posix.save.evf.gz in binary file-transfer mode. Or use the Uniform Resource Locator (URL) ftp://ftp.stratus.com/pub/vos/alpha/posix.save.evf.gz from your web browser. This is not a standard Stratus product. Instructions for unbundling this file are at ftp://ftp.stratus.com/pub/vos/utility/utility.html. 4. You must compile this version of Perl 5 on VOS Release 14.1.0 or higher because some of the perl source files contain more than 32,767 source lines. Due to VOS release-compatibility rules, this port of perl may not execute on VOS Release 12 or earlier. To build perl 5, change to the "vos" subdirectory and type the command "compile_perl -processor X", where X is the processor type (mc68020, i80860, pa7100, pa8000) that you wish to use. Note that code compiled for the pa7100 processor type can execute on the PA7100, PA8000, and PA8500 processors, and that code compiled for the pa8000 processor type can execute on the PA8000 and PA8500 processors. Installing Perl 5 on VOS ------------------------ 1. Create the directory >system>ported>command_library. 2. Copy the appropriate version of the perl program module to this directory. For example, with your current directory set to the top-level directory of Perl 5, to install the executable program module for the Motorola 68K architecture, enter: !copy_file vos>obj>perl.pm >system>ported>command_library>* (If you wish to use both Perl version 4 and Perl version 5, you must give them different names; for example, perl.pm and perl5.pm). 3. Create the directory >system>ported>perl>lib. 4. Copy all of the files and subdirectories from the lib subdirectory into this new directory. For example, with the current directory set to the top-level directory of the perl distribution, enter: !copy_dir lib >system>ported>perl>lib>5.005 5. While there are currently no architecture-specific extensions or modules distributed with perl, the following directories can be used to hold such files: >system>ported>perl>lib>5.005.68k >system>ported>perl>lib>5.005.860 >system>ported>perl>lib>5.005.7100 >system>ported>perl>lib>5.005.8000 6. Site-specific perl extensions and modules can be installed in one of two places. Put architecture-independent files into: >system>ported>perl>lib>site>5.005 Put architecture-dependent files into one of the following directories: >system>ported>perl>lib>site>5.005.68k >system>ported>perl>lib>site>5.005.860 >system>ported>perl>lib>site>5.005.7100 >system>ported>perl>lib>site>5.005.8000 7. You can examine the @INC variable from within a perl program to see the order in which Perl searches these directories. Unimplemented Features ---------------------- If Perl 5 attempts to call an unimplemented VOS POSIX.1 function, it will print a fatal error message and enter the VOS debugger. This error is not recoverable. See vos_dummies.c for a list of the unimplemented POSIX.1 functions. To see what functions are unimplemented and what the error message looks like, compile and execute "test_vos_dummies.c". Restrictions ------------ This port of Perl version 5 to VOS prefers Unix-style, slash-separated pathnames over VOS-style greater-than-separated pathnames. VOS-style pathnames should work in most contexts, but if you have trouble, replace all greater-than characters by slash characters. Because the slash character is used as a pathname delimiter, Perl cannot process VOS pathnames containing a slash character in a directory or file name; these must be renamed. This port of Perl also uses Unix-epoch date values internally. As long as you are dealing with ASCII character string representations of dates, this should not be an issue. The supported epoch is January 1, 1980 to January 17, 2038. See the file pod/perlport.pod for more information about the VOS port of Perl. Support Status -------------- I'm offering this port "as is". You can ask me questions, but I can't guarantee I'll be able to answer them; I don't know much about Perl itself; I'm still learning that. There are some excellent books available on the Perl language; consult a book seller. (end)