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=head1 NAME

perlplan9 - Plan 9-specific documentation for Perl


These are a few notes describing features peculiar to
Plan 9 Perl. As such, it is not intended to be a replacement
for the rest of the Perl 5 documentation (which is both 
copious and excellent). If you have any questions to 
which you can't find answers in these man pages, contact 
Luther Huffman at and we'll try to 
answer them.

=head2 Invoking Perl

Perl is invoked from the command line as described in 
L<perl>. Most perl scripts, however, do have a first line 
such as "#!/usr/local/bin/perl". This is known as a shebang 
(shell-bang) statement and tells the OS shell where to find 
the perl interpreter. In Plan 9 Perl this statement should be 
"#!/bin/perl" if you wish to be able to directly invoke the 
script by its name.
     Alternatively, you may invoke perl with the command "Perl"
instead of "perl". This will produce Acme-friendly error
messages of the form "filename:18".

Some scripts, usually identified with a *.PL extension, are 
self-configuring and are able to correctly create their own 
shebang path from config information located in Plan 9 
Perl. These you won't need to be worried about.

=head2 What's in Plan 9 Perl

Although Plan 9 Perl currently only  provides static 
loading, it is built with a number of useful extensions. 
These include Opcode, FileHandle, Fcntl, and POSIX. Expect 
to see others (and DynaLoading!) in the future.

=head2 What's not in Plan 9 Perl

As mentioned previously, dynamic loading isn't currently 
available nor is MakeMaker. Both are high-priority items.

=head2 Perl5 Functions not currently supported in Plan 9 Perl

Some, such as C<chown> and C<umask> aren't provided 
because the concept does not exist within Plan 9. Others,
such as some of the socket-related functions, simply
haven't been written yet. Many in the latter category 
may be supported in the future.

The functions not currently implemented include:

    chown, chroot, dbmclose, dbmopen, getsockopt, 
    setsockopt, recvmsg, sendmsg, getnetbyname, 
    getnetbyaddr, getnetent, getprotoent, getservent, 
    sethostent, setnetent, setprotoent, setservent, 
    endservent, endnetent, endprotoent, umask

There may be several other functions that have undefined 
behavior so this list shouldn't be considered complete.

=head2 Signals in Plan 9 Perl

For compatibility with perl scripts written for the Unix 
environment, Plan 9 Perl uses the POSIX signal emulation
provided in Plan 9's ANSI POSIX Environment (APE). Signal stacking
isn't supported. The signals provided are:



WELCOME to Plan 9 Perl, brave soul!

   This is a preliminary alpha version of Plan 9 Perl. Still to be
implemented are MakeMaker and DynaLoader. Many perl commands are
missing or currently behave in an inscrutable manner. These gaps will,
with perseverance and a modicum of luck, be remedied in the near
future.To install this software:

1. Create the source directories and libraries for perl by running the
plan9/setup.rc command (i.e., located in the plan9 subdirectory).
Note: the setup routine assumes that you haven't dearchived these
files into /sys/src/cmd/perl. After running setup.rc you may delete
the copy of the source you originally detarred, as source code has now
been installed in /sys/src/cmd/perl. If you plan on installing perl
binaries for all architectures, run "setup.rc -a".

2. After making sure that you have adequate privileges to build system
software, from /sys/src/cmd/perl/5.00301 (adjust version
appropriately) run:

	mk install

If you wish to install perl versions for all architectures (68020,
mips, sparc and 386) run:

	mk installall

3. Wait. The build process will take a *long* time because perl
bootstraps itself. A 75MHz Pentium, 16MB RAM machine takes roughly 30
minutes to build the distribution from scratch.

=head2 Installing Perl Documentation on Plan 9

This perl distribution comes with a tremendous amount of
documentation. To add these to the built-in manuals that come with
Plan 9, from /sys/src/cmd/perl/5.00301 (adjust version appropriately)

	mk man

To begin your reading, start with:

	man perl

This is a good introduction and will direct you towards other man
pages that may interest you.

(Note: "mk man" may produce some extraneous noise. Fear not.)

=head1 BUGS

"As many as there are grains of sand on all the beaches of the 
world . . ." - Carl Sagan

=head1 Revision date

This document was revised 09-October-1996 for Perl 5.003_7.

=head1 AUTHOR

Direct questions, comments, and the unlikely bug report (ahem) direct
comments toward:

Luther Huffman,, 
Strategic Computer Solutions, Inc.