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
email@example.com and we'll try to answer them.
Perl is invoked from the command line as described in 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
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.
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.
What's not in Plan 9 Perl¶
As mentioned previously, dynamic loading isn't currently available nor is
MakeMaker. Both are high-priority items.
Perl5 Functions not currently supported in Plan 9 Perl¶
Some, such as "chown" and "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.
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:
SIGHUP, SIGINT, SIGQUIT, SIGILL, SIGABRT,
SIGFPE, SIGKILL, SIGSEGV, SIGPIPE, SIGPIPE, SIGALRM,
SIGTERM, SIGUSR1, SIGUSR2, SIGCHLD, SIGCONT,
SIGSTOP, SIGTSTP, SIGTTIN, SIGTTOU
COMPILING AND INSTALLING PERL ON PLAN 9¶
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:
If you wish to install perl versions for all architectures (68020, mips, sparc
and 386) run:
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.
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) run:
To begin your reading, start with:
This is a good introduction and will direct you towards other man pages that may
(Note: "mk man" may produce some extraneous noise. Fear not.)
"As many as there are grains of sand on all the beaches of the world . .
." - Carl Sagan
This document was revised 09-October-1996 for Perl 5.003_7.
Direct questions, comments, and the unlikely bug report (ahem) direct comments
Luther Huffman, firstname.lastname@example.org, Strategic Computer Solutions, Inc.