X-Git-Url: https://perl5.git.perl.org/perl5.git/blobdiff_plain/df3ef7a9a68db503d1aecd7cb40d5f974fa0066b..948ed65c2d5d9ca21c1cfa047db55fc6022dc977:/README.os2 diff --git a/README.os2 b/README.os2 index e6782e3..fbc2731 100644 --- a/README.os2 +++ b/README.os2 @@ -27,9 +27,15 @@ A copy of a Win* viewer is contained in the "Just add OS/2 Warp" package ftp://ftp.software.ibm.com/ps/products/os2/tools/jaow/jaow.zip -in F. This gives one an access to B's +in F. This gives one an access to EMX's F<.INF> docs as well (text form is available in F in -B's distribution). +EMX's distribution). + +Note that if you have F installed, you can follow WWW links +from this document in F<.INF> format. If you have EMX docs installed +correctly, you can follow library links (you need to have C +working by setting C environment variable as it is described +in EMX docs). =cut @@ -43,12 +49,13 @@ Contents - Target - Other OSes - Prerequisites - - Starting Perl programs under OS/2 - - Starting OS/2 programs under Perl + - Starting Perl programs under OS/2 (and DOS and...) + - Starting OS/2 (and DOS) programs under Perl Frequently asked questions - I cannot run external programs - I cannot embed perl into my program, or use perl.dll from my program. - `` and pipe-open do not work under DOS. + - Cannot start find.exe "pattern" file INSTALLATION - Automatic binary installation - Manual binary installation @@ -77,9 +84,10 @@ Contents - Some problem (forget which ;-) - Library ... not found - Segfault in make - Specific (mis)features of OS/2 port + Specific (mis)features of EMX port - setpriority, getpriority - system() + - extproc on the first line - Additional modules: - Prebuilt methods: - Misfeatures @@ -104,16 +112,18 @@ Contents - Threading - Calls to external programs - Memory allocation + - Threads AUTHOR SEE ALSO - + =head1 DESCRIPTION =head2 Target The target is to make OS/2 the best supported platform for using/building/developing Perl and I, as well as -make Perl the best language to use under OS/2. +make Perl the best language to use under OS/2. The secondary target is +to try to make this work under DOS and Win* as well (but not B hard). The current state is quite close to this target. Known limitations: @@ -121,20 +131,28 @@ The current state is quite close to this target. Known limitations: =item * -Some *nix programs use fork() a lot, but currently fork() is not -supported after Iing dynamically loaded extensions. +Some *nix programs use fork() a lot; with the mostly useful flavors of perl +for OS/2 (there are several built simultaneously) this is supported; +some flavors do not. Using fork() after Iing dynamically loading +extensions would not work with very old versions of EMX. =item * You need a separate perl executable F (see L) -to use PM code in your application (like the forthcoming Perl/Tk). +if you want to use PM code in your application (as Perl/Tk or OpenGL +Perl modules do) without having a text-mode window present. + +While using the standard F from a text-mode window is possible +too, I have seen cases when this causes degradation of the system stability. +Using F avoids such a degradation. =item * -There is no simple way to access B objects. The only way I know +There is no simple way to access WPS objects. The only way I know is via C extension (see L), and we do not have access to -convenience methods of B. (Is it possible at all? I know -of no B API.) +convenience methods of Object-REXX. (Is it possible at all? I know +of no Object-REXX API.) The C extension (currently in alpha-text) +may eventually remove this shortcoming. =back @@ -142,15 +160,15 @@ Please keep this list up-to-date by informing me about other items. =head2 Other OSes -Since OS/2 port of perl uses a remarkable B environment, it can -run (and build extensions, and - possibly - be build itself) under any +Since OS/2 port of perl uses a remarkable EMX environment, it can +run (and build extensions, and - possibly - be built itself) under any environment which can run EMX. The current list is DOS, DOS-inside-OS/2, Win0.3*, Win0.95 and WinNT. Out of many perl flavors, only one works, see L<"perl_.exe">. Note that not all features of Perl are available under these environments. This depends on the features the I - most -probably C - decided to implement. +probably RSX - decided to implement. Cf. L. @@ -158,22 +176,24 @@ Cf. L. =over 6 -=item B +=item EMX -B runtime is required (may be substituted by B). Note that +EMX runtime is required (may be substituted by RSX). Note that it is possible to make F to run under DOS without any external support by binding F/F to it, see L. Note -that under DOS for best results one should use B runtime, which +that under DOS for best results one should use RSX runtime, which has much more functions working (like C, C and so on). In -fact B is required if there is no C present. Note the -B requires C. +fact RSX is required if there is no VCPI present. Note the +RSX requires DPMI. -Only the latest runtime is supported, currently C<0.9c>. +Only the latest runtime is supported, currently C<0.9d fix 03>. Perl may run +under earlier versions of EMX, but this is not tested. -One can get different parts of B from, say +One can get different parts of EMX from, say - ftp://ftp.cdrom.com/pub/os2/emx0.9c/ - ftp://hobbes.nmsu.edu/os2/unix/gnu/ + http://www.leo.org/pub/comp/os/os2/leo/gnu/emx+gcc/ + http://powerusersbbs.com/pub/os2/dev/ [EMX+GCC Development] + http://hobbes.nmsu.edu/pub/os2/dev/emx/v0.9d/ The runtime component should have the name F. @@ -184,41 +204,57 @@ does not need to specify them explicitly (though this will work as well.) -=item B +=item RSX -To run Perl on C platforms one needs B runtime. This is +To run Perl on DPMI platforms one needs RSX runtime. This is needed under DOS-inside-OS/2, Win0.3*, Win0.95 and WinNT (see -L<"Other OSes">). B would not work with C -only, as B would, it requires C. +L<"Other OSes">). RSX would not work with VCPI +only, as EMX would, it requires DMPI. -Having B and the latest F one gets a fully functional +Having RSX and the latest F one gets a fully functional B<*nix>-ish environment under DOS, say, C, C<``> and pipe-C work. In fact, MakeMaker works (for static build), so one can have Perl development environment under DOS. -One can get B from, say +One can get RSX from, say - ftp://ftp.cdrom.com/pub/os2/emx0.9c/contrib + ftp://ftp.cdrom.com/pub/os2/emx09c/contrib ftp://ftp.uni-bielefeld.de/pub/systems/msdos/misc + ftp://ftp.leo.org/pub/comp/os/os2/leo/devtools/emx+gcc/contrib Contact the author on C. -The latest F with DOS hooks is available at +The latest F with DOS hooks is available in - ftp://ftp.math.ohio-state.edu/pub/users/ilya/os2/sh_dos.exe + ftp://ftp.math.ohio-state.edu/pub/users/ilya/os2/ -=item B +as F or under similar names starting with C, C etc. + +=item HPFS Perl does not care about file systems, but to install the whole perl library intact one needs a file system which supports long file names. Note that if you do not plan to build the perl itself, it may be -possible to fool B to truncate file names. This is not supported, -read B docs to see how to do it. +possible to fool EMX to truncate file names. This is not supported, +read EMX docs to see how to do it. + +=item pdksh + +To start external programs with complicated command lines (like with +pipes in between, and/or quoting of arguments), Perl uses an external +shell. With EMX port such shell should be named F, and located +either in the wired-in-during-compile locations (usually F), +or in configurable location (see L<"PERL_SH_DIR">). + +For best results use EMX pdksh. The standard binary (5.2.14 or later) runs +under DOS (with L) as well, see + + ftp://ftp.math.ohio-state.edu/pub/users/ilya/os2/ =back -=head2 Starting Perl programs under OS/2 +=head2 Starting Perl programs under OS/2 (and DOS and...) Start your Perl program F with arguments C the same way as on any other platform, by @@ -230,33 +266,28 @@ opposed to to your program), use perl -my_opts foo.pl arg1 arg2 arg3 -Alternately, if you use OS/2-ish shell, like C or C<4os2>, put +Alternately, if you use OS/2-ish shell, like CMD or 4os2, put the following at the start of your perl script: - extproc perl -x -S - #!/usr/bin/perl -my_opts + extproc perl -S -my_opts rename your program to F, and start it by typing foo arg1 arg2 arg3 -(Note that having *nixish full path to perl F is not -necessary, F would be enough, but having full path would make it -easier to use your script under *nix.) - Note that because of stupid OS/2 limitations the full path of the perl script is not available when you use C, thus you are forced to -use C<-S> perl switch, and your script should be on path. As a plus +use C<-S> perl switch, and your script should be on the C. As a plus side, if you know a full path to your script, you may still start it with - perl -x ../../blah/foo.cmd arg1 arg2 arg3 + perl ../../blah/foo.cmd arg1 arg2 arg3 -(note that the argument C<-my_opts> is taken care of by the C<#!> line -in your script). +(note that the argument C<-my_opts> is taken care of by the C line +in your script, see L on the first line>). To understand what the above I does, read perl docs about C<-S> -and C<-x> switches - see L, and cmdref about C: +switch - see L, and cmdref about C: view perl perlrun man perlrun @@ -266,11 +297,14 @@ and C<-x> switches - see L, and cmdref about C: or whatever method you prefer. There are also endless possibilities to use I of -B<4OS2>, I of B and so on... However, if you use +4os2, I of WPS and so on... However, if you use *nixish shell (like F supplied in the binary distribution), you need to follow the syntax specified in L. -=head2 Starting OS/2 programs under Perl +Note that B<-S> switch enables a search with additional extensions +F<.cmd>, F<.btm>, F<.bat>, F<.pl> as well. + +=head2 Starting OS/2 (and DOS) programs under Perl This is what system() (see L), C<``> (see L), and I (see L) @@ -278,27 +312,111 @@ are for. (Avoid exec() (see L) unless you know what you do). Note however that to use some of these operators you need to have a -C-syntax shell installed (see L<"Pdksh">, +sh-syntax shell installed (see L<"Pdksh">, L<"Frequently asked questions">), and perl should be able to find it (see L<"PERL_SH_DIR">). -The only cases when the shell is not used is the multi-argument -system() (see L)/exec() (see L), and -one-argument version thereof without redirection and shell -meta-characters. +The cases when the shell is used are: + +=over + +=item 1 + +One-argument system() (see L), exec() (see L) +with redirection or shell meta-characters; + +=item 2 + +Pipe-open (see L) with the command which contains redirection +or shell meta-characters; + +=item 3 + +Backticks C<``> (see L) with the command which contains +redirection or shell meta-characters; + +=item 4 + +If the executable called by system()/exec()/pipe-open()/C<``> is a script +with the "magic" C<#!> line or C line which specifies shell; + +=item 5 + +If the executable called by system()/exec()/pipe-open()/C<``> is a script +without "magic" line, and C<$ENV{EXECSHELL}> is set to shell; + +=item 6 + +If the executable called by system()/exec()/pipe-open()/C<``> is not +found; + +=item 7 + +For globbing (see L, L). + +=back + +For the sake of speed for a common case, in the above algorithms +backslashes in the command name are not considered as shell metacharacters. + +Perl starts scripts which begin with cookies +C or C<#!> directly, without an intervention of shell. Perl uses the +same algorithm to find the executable as F: if the path +on C<#!> line does not work, and contains C, then the executable +is searched in F<.> and on C. To find arguments for these scripts +Perl uses a different algorithm than F: up to 3 arguments are +recognized, and trailing whitespace is stripped. + +If a script +does not contain such a cooky, then to avoid calling F, Perl uses +the same algorithm as F: if C<$ENV{EXECSHELL}> is set, the +script is given as the first argument to this command, if not set, then +C<$ENV{COMSPEC} /c> is used (or a hardwired guess if C<$ENV{COMSPEC}> is +not set). + +If starting scripts directly, Perl will use exactly the same algorithm as for +the search of script given by B<-S> command-line option: it will look in +the current directory, then on components of C<$ENV{PATH}> using the +following order of appended extensions: no extension, F<.cmd>, F<.btm>, +F<.bat>, F<.pl>. + +Note that Perl will start to look for scripts only if OS/2 cannot start the +specified application, thus C will not look for a script if +there is an executable file F I on C. + +Note also that executable files on OS/2 can have an arbitrary extension, +but F<.exe> will be automatically appended if no dot is present in the name. +The workaround as as simple as that: since F and F denote the +same file, to start an executable residing in file F (no +extension) give an argument C (dot appended) to system(). + +Perl will correctly start PM programs from VIO (=text-mode) Perl process; +the opposite is not true: when you start a non-PM program from a PM +Perl process, it would not run it in a separate session. If a separate +session is desired, either ensure +that shell will be used, as in C, or start it using +optional arguments to system() documented in C module. This +is considered to be a feature. =head1 Frequently asked questions +=head2 "It does not work" + +Perl binary distributions come with a F script which tries +to detect common problems with misconfigured installations. There is a +pretty large chance it will discover which step of the installation you +managed to goof. C<;-)> + =head2 I cannot run external programs =over 4 -=item +=item * Did you run your programs with C<-w> switch? See -L. +L. -=item +=item * Do you try to run I shell commands, like C<`copy a b`> (internal for F), or C<`glob a*b`> (internal for ksh)? You @@ -312,12 +430,12 @@ program. =over 4 -=item Is your program B-compiled with C<-Zmt -Zcrtdll>? +=item Is your program EMX-compiled with C<-Zmt -Zcrtdll>? If not, you need to build a stand-alone DLL for perl. Contact me, I did it once. Sockets would not work, as a lot of other stuff. -=item Did you use C? +=item Did you use L? I had reports it does not work. Somebody would need to fix it. @@ -326,25 +444,42 @@ I had reports it does not work. Somebody would need to fix it. =head2 C<``> and pipe-C do not work under DOS. This may a variant of just L<"I cannot run external programs">, or a -deeper problem. Basically: you I B (see L<"Prerequisites">) +deeper problem. Basically: you I RSX (see L<"Prerequisites">) for these commands to work, and you may need a port of F which understands command arguments. One of such ports is listed in -L<"Prerequisites"> under B. +L<"Prerequisites"> under RSX. Do not forget to set variable +C> as well. + +DPMI is required for RSX. + +=head2 Cannot start C + +Use one of -C is required for B. + system 'cmd', '/c', 'find "pattern" file'; + `cmd /c 'find "pattern" file'` + +This would start F via F via C via +C, but this is a price to pay if you want to use +non-conforming program. In fact F cannot be started at all +using C library API only. Otherwise the following command-lines would be +equivalent: + + find "pattern" file + find pattern file =head1 INSTALLATION =head2 Automatic binary installation -The most convenient way of installing perl is via perl installer +The most convenient way of installing a binary distribution of perl is via perl installer F. Just follow the instructions, and 99% of the installation blues would go away. Note however, that you need to have F on your path, and -B environment I. The latter means that if you just -installed B, and made all the needed changes to F, -you may need to reboot in between. Check B runtime by running +EMX environment I. The latter means that if you just +installed EMX, and made all the needed changes to F, +you may need to reboot in between. Check EMX runtime by running emxrev @@ -358,7 +493,7 @@ B =item C may be needed if you change your codepage I perl installation, -and the new value is not supported by B. See L<"PERL_BADLANG">. +and the new value is not supported by EMX. See L<"PERL_BADLANG">. =item C @@ -377,19 +512,23 @@ data, please keep me informed if you find one. =back +B. Because of a typo the binary installer of 5.00305 +would install a variable C into F. Please +remove this variable and put C> instead. + =head2 Manual binary installation As of version 5.00305, OS/2 perl binary distribution comes split into 11 components. Unfortunately, to enable configurable binary -installation, the file paths in the C files are not absolute, but +installation, the file paths in the zip files are not absolute, but relative to some directory. Note that the extraction with the stored paths is still necessary -(default with C, specify C<-d> to C). However, you +(default with unzip, specify C<-d> to pkunzip). However, you need to know where to extract the files. You need also to manually change entries in F to reflect where did you put the files. Note that if you have some primitive unzipper (like -C), you may get a lot of warnings/errors during +pkunzip), you may get a lot of warnings/errors during unzipping. Upgrade to C<(w)unzip>. Below is the sample of what to do to reproduce the configuration on my @@ -402,70 +541,72 @@ machine: unzip perl_exc.zip *.exe *.ico -d f:/emx.add/bin unzip perl_exc.zip *.dll -d f:/emx.add/dll -(have the directories with C<*.exe> on C, and C<*.dll> on -C); +(have the directories with C<*.exe> on PATH, and C<*.dll> on +LIBPATH); =item Perl_ VIO executable (statically linked) unzip perl_aou.zip -d f:/emx.add/bin -(have the directory on C); +(have the directory on PATH); =item Executables for Perl utilities unzip perl_utl.zip -d f:/emx.add/bin -(have the directory on C); +(have the directory on PATH); =item Main Perl library unzip perl_mlb.zip -d f:/perllib/lib -If this directory is preserved, you do not need to change -anything. However, for perl to find it if it is changed, you need to +If this directory is exactly the same as the prefix which was compiled +into F, you do not need to change +anything. However, for perl to find the library if you use a different +path, you need to C in F, see L<"PERLLIB_PREFIX">. =item Additional Perl modules - unzip perl_ste.zip -d f:/perllib/lib/site_perl + unzip perl_ste.zip -d f:/perllib/lib/site_perl/5.8.3/ -If you do not change this directory, do nothing. Otherwise put this +Same remark as above applies. Additionally, if this directory is not +one of directories on @INC (and @INC is influenced by C), you +need to put this directory and subdirectory F<./os2> in C or C variable. Do not use C unless you have it set already. See -L. +L. =item Tools to compile Perl modules unzip perl_blb.zip -d f:/perllib/lib -If this directory is preserved, you do not need to change -anything. However, for perl to find it if it is changed, you need to -C in F, see L<"PERLLIB_PREFIX">. +Same remark as for F. =item Manpages for Perl and utilities unzip perl_man.zip -d f:/perllib/man This directory should better be on C. You need to have a -working C to access these files. +working man to access these files. =item Manpages for Perl modules unzip perl_mam.zip -d f:/perllib/man This directory should better be on C. You need to have a -working C to access these files. +working man to access these files. =item Source for Perl documentation unzip perl_pod.zip -d f:/perllib/lib -This is used by by C program (see L), and may be used to -generate B documentation usable by WWW browsers, and +This is used by the C program (see L), and may be used to +generate HTML documentation usable by WWW browsers, and documentation in zillions of other formats: C, C, C, C and so on. -=item Perl manual in .INF format +=item Perl manual in F<.INF> format unzip perl_inf.zip -d d:/os2/book @@ -482,8 +623,8 @@ metacharacters>. It is also used instead of explicit F. Set C (see L<"PERL_SH_DIR">) if you move F from the above location. -B It may be possible to use some other C-compatible shell -(I). +B It may be possible to use some other sh-compatible shell +(file globbing - if done via shell - may break). =back @@ -511,7 +652,7 @@ identical) Perl documentation in the following formats: =head2 OS/2 F<.INF> file -Most probably the most convenient form. View it as +Most probably the most convenient form. Under OS/2 view it as view perl view perl perlfunc @@ -519,7 +660,7 @@ Most probably the most convenient form. View it as view perl ExtUtils::MakeMaker (currently the last two may hit a wrong location, but this may improve -soon). +soon). Under Win* see L<"SYNOPSIS">. If you want to build the docs yourself, and have I, run @@ -535,7 +676,7 @@ BOOKSHELF path. =head2 Plain text If you have perl documentation in the source form, perl utilities -installed, and B C installed, you may use +installed, and GNU groff installed, you may use perldoc perlfunc perldoc less @@ -548,7 +689,7 @@ Alternately, try running pod2text on F<.pod> files. =head2 Manpages -If you have C installed on your system, and you installed perl +If you have man installed on your system, and you installed perl manpages, use something like this: man perlfunc @@ -568,11 +709,13 @@ on our C, like this set MANPATH=c:/man;f:/perllib/man -=head2 B +for Perl manpages in C etc. + +=head2 HTML If you have some WWW browser available, installed the Perl documentation in the source form, and Perl utilities, you can build -B docs. Cd to directory with F<.pod> files, and do like this +HTML docs. Cd to directory with F<.pod> files, and do like this cd f:/perllib/lib/pod pod2html @@ -582,11 +725,11 @@ directory, and go ahead with reading docs, like this: explore file:///f:/perllib/lib/pod/perl.html -Alternatively you may be able to get these docs prebuilt from C. +Alternatively you may be able to get these docs prebuilt from CPAN. -=head2 B C files +=head2 GNU C files -Users of C would appreciate it very much, especially with +Users of Emacs would appreciate it very much, especially with C mode loaded. You need to get latest C from C, or, alternately, prebuilt info pages. @@ -602,12 +745,34 @@ can be constructed using C. =head1 BUILD Here we discuss how to build Perl under OS/2. There is an alternative -(but maybe older) view on L. +(but maybe older) view on http://www.shadow.net/~troc/os2perl.html + +=head2 The short story + +Assume that you are a seasoned porter, so are sure that all the necessary +tools are already present on your system, and you know how to get the Perl +source distribution. Untar it, change to the extract directory, and + + gnupatch -p0 < os2\diff.configure + sh Configure -des -D prefix=f:/perllib + make + make test + make install + make aout_test + make aout_install + +This puts the executables in f:/perllib/bin. Manually move them to the +C, manually move the built F to C (here F<*> is +a not-very-meaningful hex checksum), and run + + make installcmd INSTALLCMDDIR=d:/ir/on/path + +What follows is a detailed guide through these steps. =head2 Prerequisites -You need to have the latest B development environment, the full -B tool suite (C renamed to C, and B F +You need to have the latest EMX development environment, the full +GNU tool suite (gawk renamed to awk, and GNU F earlier on path than the OS/2 F, same with F, to check use @@ -616,16 +781,27 @@ check use ). You need the latest version of F installed as F. +Check that you have B libraries and headers installed, and - +optionally - Berkeley DB headers and libraries, and crypt. + Possible locations to get this from are - ftp://hobbes.nmsu.edu/os2/unix/gnu/ + ftp://hobbes.nmsu.edu/os2/unix/ ftp://ftp.cdrom.com/pub/os2/unix/ ftp://ftp.cdrom.com/pub/os2/dev32/ - ftp://ftp.cdrom.com/pub/os2/emx0.9c/ + ftp://ftp.cdrom.com/pub/os2/emx09c/ + +It is reported that the following archives contain enough utils to +build perl: F, F, F, F, +F, F, F, F and +F (or a later version). Note that all these utilities are +known to be available from LEO: + ftp://ftp.leo.org/pub/comp/os/os2/leo/gnu -Make sure that no copies or perl are currently running. Later steps -of the build may fail since an older version of perl.dll loaded into +If you have I installed already, +make sure that no copies or perl are currently running. Later steps +of the build may fail since an older version of F loaded into memory may be found. Also make sure that you have F directory on the current drive, @@ -636,17 +812,17 @@ latter condition by if you use something like F or latest versions of F<4os2.exe>. -Make sure your C is good for C<-Zomf> linking: run C +Make sure your gcc is good for C<-Zomf> linking: run C script in F directory. -Check that you have C installed. It comes standard with OS/2, +Check that you have link386 installed. It comes standard with OS/2, but may be not installed due to customization. If typing link386 shows you do not have it, do I, and choose C in I. If you get into -C, press C. +link386 prompts, press C to exit. =head2 Getting perl source @@ -675,27 +851,21 @@ Extract it like this You may see a message about errors while extracting F. This is because there is a conflict with a similarly-named file F. -Rename F to F. Extract F like this - - tar --case-sensitive -vzxf perl5.00409.tar.gz perl5.00409/Configure - Change to the directory of extraction. =head2 Application of the patches -You need to apply the patches in F<./os2/diff.*> and -F<./os2/POSIX.mkfifo> like this: +You need to apply the patches in F<./os2/diff.*> like this: - gnupatch -p0 < os2\POSIX.mkfifo gnupatch -p0 < os2\diff.configure You may also need to apply the patches supplied with the binary distribution of perl. -Note also that the F and F from the B distribution -are not suitable for multi-threaded compile (note that currently perl -is not multithreaded, but is compiled as multithreaded for -compatibility with B-OS/2). Get a corrected one from +Note also that the F and F from the EMX distribution +are not suitable for multi-threaded compile (even single-threaded +flavor of Perl uses multi-threaded C RTL, for +compatibility with XFree86-OS/2). Get a corrected one from ftp://ftp.math.ohio-state.edu/pub/users/ilya/os2/db_mt.zip @@ -708,27 +878,23 @@ wrong you find there. I do not expect it is needed anywhere. sh Configure -des -D prefix=f:/perllib -Prefix means where to install the resulting perl library. Giving +C means: where to install the resulting perl library. Giving correct prefix you may avoid the need to specify C, see L<"PERLLIB_PREFIX">. I, and about C<-c> option to -C>. In fact if you can trace where the latter spurious warning -comes from, please inform me. +tr>. The latter is most probably already fixed, if you see it and can trace +where the latter spurious warning comes from, please inform me. Now make At some moment the built may die, reporting a I or -I>. This means that most of the build has been -finished, and it is the time to move the constructed F to -some I location in C. After this done the build -should finish without a lot of fuss. I on C.> - -Warnings which are safe to ignore: I inside -F. +I>. This means that you do not have F<.> in +your LIBPATH, so F cannot find the needed F (treat +these hex digits as line noise). After this is fixed the build +should finish without a lot of fuss. =head2 Testing @@ -736,51 +902,53 @@ Now run make test -Some tests (4..6) should fail. Some perl invocations should end in a -segfault (system error C). To get finer error reports, +All tests should succeed (with some of them skipped). - cd t - perl -I ../lib harness +Some tests may generate extra messages similar to -The report you get may look like +=over 4 - Failed Test Status Wstat Total Fail Failed List of failed - --------------------------------------------------------------- - io/fs.t 26 11 42.31% 2-5, 7-11, 18, 25 - lib/io_pipe.t 3 768 6 ?? % ?? - lib/io_sock.t 3 768 5 ?? % ?? - op/stat.t 56 5 8.93% 3-4, 20, 35, 39 - Failed 4/140 test scripts, 97.14% okay. 27/2937 subtests failed, 99.08% okay. +=item A lot of C -Note that using `make test' target two more tests may fail: C -because of (mis)feature of C, and C, which checks -that the buffers are not flushed on C<_exit> (this is a bug in the test -which assumes that tty output is buffered). +in database tests related to Berkeley DB. I +If it persists, you may disable this warnings, see L<"PERL_BADFREE">. + +=item Process terminated by SIGTERM/SIGINT -I submitted a patch to B which makes it possible to fork() with EMX -dynamic libraries loaded, which makes F tests pass. This means -that soon the number of failing tests may decrease yet more. +This is a standard message issued by OS/2 applications. *nix +applications die in silence. It is considered to be a feature. One can +easily disable this by appropriate sighandlers. -However, the test F is disabled, since it never terminates, I -do not know why. Comments/fixes welcome. +However the test engine bleeds these message to screen in unexpected +moments. Two messages of this kind I be present during +testing. -The reasons for failed tests are: +=back -=over 8 +To get finer test reports, call -=item F + perl t/harness -Checks I operations. Tests: +The report with F failing may look like this: -=over 10 + Failed Test Status Wstat Total Fail Failed List of failed + ------------------------------------------------------------ + io/pipe.t 12 1 8.33% 9 + 7 tests skipped, plus 56 subtests skipped. + Failed 1/195 test scripts, 99.49% okay. 1/6542 subtests failed, 99.98% okay. -=item 2-5, 7-11 +The reasons for most important skipped tests are: -Check C and C - nonesuch under OS/2. +=over 8 + +=item F + +=over 4 =item 18 -Checks C and C of C - I could not understand this test. +Checks C and C of C - unfortunately, HPFS +provides only 2sec time granularity (for compatibility with FAT?). =item 25 @@ -789,94 +957,39 @@ know why this should or should not work. =back -=item F - -Checks C module. Some feature of B - test fork()s with -dynamic extension loaded - unsupported now. - -=item F - -Checks C module. Some feature of B - test fork()s -with dynamic extension loaded - unsupported now. - =item F Checks C. Tests: =over 4 -=item 3 - -Checks C - nonesuch under OS/2. - =item 4 -Checks C and C of C - I could not understand this test. - -=item 20 - -Checks C<-x> - determined by the file extension only under OS/2. - -=item 35 - -Needs F. - -=item 39 - -Checks C<-t> of F. Should not fail! - -=back +Checks C and C of C - unfortunately, HPFS +provides only 2sec time granularity (for compatibility with FAT?). =back -In addition to errors, you should get a lot of warnings. - -=over 4 - -=item A lot of `bad free' - -in databases related to Berkeley DB. This is a confirmed bug of -DB. You may disable this warnings, see L<"PERL_BADFREE">. - -=item Process terminated by SIGTERM/SIGINT - -This is a standard message issued by OS/2 applications. *nix -applications die in silence. It is considered a feature. One can -easily disable this by appropriate sighandlers. - -However the test engine bleeds these message to screen in unexpected -moments. Two messages of this kind I be present during -testing. - -=item F<*/sh.exe>: ln: not found - -=item C: /dev: No such file or directory - -The last two should be self-explanatory. The test suite discovers that -the system it runs on is not I *nixish. - =back -A lot of `bad free'... in databases, bug in DB confirmed on other -platforms. You may disable it by setting PERL_BADFREE environment variable -to 1. - =head2 Installing the built perl +If you haven't yet moved perl.dll onto LIBPATH, do it now. + Run make install It would put the generated files into needed locations. Manually put F, F and F to a location on your -C, F to a location on your C. +PATH, F to a location on your LIBPATH. Run - make cmdscripts INSTALLCMDDIR=d:/ir/on/path + make installcmd INSTALLCMDDIR=d:/ir/on/path to convert perl utilities to F<.cmd> files and put them on -C. You need to put F<.EXE>-utilities on path manually. They are +PATH. You need to put F<.EXE>-utilities on path manually. They are installed in C<$prefix/bin>, here C<$prefix> is what you gave to F, see L. @@ -891,23 +1004,13 @@ test and install by make aout_test make aout_install -Manually put F to a location on your C. - -Since C has the extensions prebuilt, it does not suffer from -the I syndrome, thus the failing tests -look like - - Failed Test Status Wstat Total Fail Failed List of failed - --------------------------------------------------------------- - io/fs.t 26 11 42.31% 2-5, 7-11, 18, 25 - op/stat.t 56 5 8.93% 3-4, 20, 35, 39 - Failed 2/118 test scripts, 98.31% okay. 16/2445 subtests failed, 99.35% okay. +Manually put F to a location on your PATH. B The build process for C I about all the dependencies, so you should make sure that anything is up-to-date, say, by doing - make perl.dll + make perl_dll first. @@ -921,13 +1024,13 @@ You have a very old pdksh. See L. You do not have MT-safe F. See L. -=head2 Problems with C +=head2 Problems with tr or sed -reported with very old version of C. +reported with very old version of tr and sed. =head2 Some problem (forget which ;-) -You have an older version of F on your C, which +You have an older version of F on your LIBPATH, which broke the build of extensions. =head2 Library ... not found @@ -936,7 +1039,11 @@ You did not run C. See L. =head2 Segfault in make -You use an old version of C make. See L. +You use an old version of GNU make. See L. + +=head2 op/sprintf test failure + +This can result from a bug in emx sprintf which was fixed in 0.9d fix 03. =head1 Specific (mis)features of OS/2 port @@ -946,21 +1053,67 @@ Note that these functions are compatible with *nix, not with the older ports of '94 - 95. The priorities are absolute, go from 32 to -95, lower is quicker. 0 is the default priority. +B. Calling C on a non-existing process can lock the +system before Warp3 fixpak22. + =head2 C Multi-argument form of C allows an additional numeric argument. The meaning of this argument is described in L. +When finding a program to run, Perl first asks the OS to look for executables +on C. If not found, it looks for a script with possible extensions +added in this order: no extension, F<.cmd>, F<.btm>, +F<.bat>, F<.pl>. If found, Perl checks the start of the file for magic +strings C<"#!"> and C<"extproc ">. If found, Perl uses the rest of the +first line as the beginning of the command line to run this script. The +only mangling done to the first line is extraction of arguments (currently +up to 3), and ignoring of the path-part of the "interpreter" name if it can't +be found using the full path. + +E.g., C may lead Perl to finding +F with the first line being + + extproc /bin/bash -x -c + +If F is not found, and appending of executable extensions to +F does not help either, then Perl looks for an executable F on +C. If found in F, then the above system() is +translated to + + system qw(C:/emx.add/bin/bash.exe -x -c C:/emx/bin/foo.cmd bar baz) + +One additional translation is performed: instead of F Perl uses +the hardwired-or-customized shell (see C>). + +The above search for "interpreter" is recursive: if F executable is not +found, but F is found, Perl will investigate its first line etc. +The only hardwired limit on the recursion depth is implicit: there is a limit +4 on the number of additional arguments inserted before the actual arguments +given to system(). In particular, if no additional arguments are specified +on the "magic" first lines, then the limit on the depth is 4. + +If Perl finds that the found executable is of different type than the +current session, it will start the new process in a separate session of +necessary type. Call via C to disable this magic. + +=head2 C on the first line + +If the first chars of a Perl script are C<"extproc ">, this line is treated +as C<#!>-line, thus all the switches on this line are processed (twice +if script was started via cmd.exe). See L. + =head2 Additional modules: -L, L, L, L. This -modules provide access to additional numeric argument for C, -to DLLs having functions with REXX signature and to REXX runtime, to +L, L, L, L, L. These +modules provide access to additional numeric argument for C +and to the information about the running process, +to DLLs having functions with REXX signature and to the REXX runtime, to OS/2 databases in the F<.INI> format, and to Extended Attributes. Two additional extensions by Andreas Kaiser, C, and -C, are included into my ftp directory, mirrored on CPAN. +C, are included into C directory, mirrored on CPAN. =head2 Prebuilt methods: @@ -968,7 +1121,7 @@ C, are included into my ftp directory, mirrored on CPAN. =item C -used by C, see L. +used by C, see L. =item C @@ -984,6 +1137,7 @@ leaves drive as it is. =item C +chanes the "current" drive. =item C @@ -999,7 +1153,7 @@ means changes with current dir. =item C -Interface to cwd from B. Used by C. +Interface to cwd from EMX. Used by C. =item C @@ -1007,7 +1161,7 @@ Really really odious function to implement. Returns absolute name of file which would have C if CWD were C. C defaults to the current dir. -=item C Get current value of extended library search path. If C is present and I, works with END_LIBPATH, otherwise with @@ -1019,42 +1173,220 @@ Set current value of extended library search path. If C is present and I, works with END_LIBPATH, otherwise with C. +=item C + +Returns C if it was not called yet, otherwise bit 1 is +set if on the previous call do_harderror was enabled, bit +2 is set if if on previous call do_exception was enabled. + +This function enables/disables error popups associated with +hardware errors (Disk not ready etc.) and software exceptions. + +I know of no way to find out the state of popups I the first call +to this function. + +=item C + +Returns C if it was not called yet, otherwise return false if errors +were not requested to be written to a hard drive, or the drive letter if +this was requested. + +This function may redirect error popups associated with hardware errors +(Disk not ready etc.) and software exceptions to the file POPUPLOG.OS2 at +the root directory of the specified drive. Overrides OS2::Error() specified +by individual programs. Given argument undef will disable redirection. + +Has global effect, persists after the application exits. + +I know of no way to find out the state of redirection of popups to the disk +I the first call to this function. + +=item OS2::SysInfo() + +Returns a hash with system information. The keys of the hash are + + MAX_PATH_LENGTH, MAX_TEXT_SESSIONS, MAX_PM_SESSIONS, + MAX_VDM_SESSIONS, BOOT_DRIVE, DYN_PRI_VARIATION, + MAX_WAIT, MIN_SLICE, MAX_SLICE, PAGE_SIZE, + VERSION_MAJOR, VERSION_MINOR, VERSION_REVISION, + MS_COUNT, TIME_LOW, TIME_HIGH, TOTPHYSMEM, TOTRESMEM, + TOTAVAILMEM, MAXPRMEM, MAXSHMEM, TIMER_INTERVAL, + MAX_COMP_LENGTH, FOREGROUND_FS_SESSION, + FOREGROUND_PROCESS + +=item OS2::BootDrive() + +Returns a letter without colon. + +=item C, C + +Transforms the current application into a PM application and back. +The argument true means that a real message loop is going to be served. +OS2::MorphPM() returns the PM message queue handle as an integer. + +See L<"Centralized management of resources"> for additional details. + +=item C + +Fake on-demand retrieval of outstanding PM messages. If C is false, +will not dispatch messages if a real message loop is known to +be present. Returns number of messages retrieved. + +Dies with "QUITing..." if WM_QUIT message is obtained. + +=item C + +Retrieval of PM messages until window creation/destruction. +If C is false, will not dispatch messages if a real message loop +is known to be present. + +Returns change in number of windows. If C is given, +it is incremented by the number of messages retrieved. + +Dies with "QUITing..." if WM_QUIT message is obtained. + +=item C + +the same as L<_control87(3)> of EMX. Takes integers as arguments, returns +the previous coprocessor control word as an integer. Only bits in C which +are present in C are changed in the control word. + +=item OS2::get_control87() + +gets the coprocessor control word as an integer. + +=item C + +The variant of OS2::_control87() with default values good for +handling exception mask: if no C, uses exception mask part of C +only. If no C, disables all the floating point exceptions. + +See L<"Misfeatures"> for details. + =back (Note that some of these may be moved to different libraries - eventually). +=head2 Prebuilt variables: + +=over 4 + +=item $OS2::emx_rev + +same as _emx_rev of EMX, a string similar to C<0.9c>. + +=item $OS2::emx_env + +same as _emx_env of EMX, a number similar to 0x8001. + +=item $OS2::os_ver + +a number C. + +=back + =head2 Misfeatures =over 4 -=item +=item * -Since is present in B, but is not functional, the same is -true for perl. Here is the list of things which may be "broken" on +Since L is present in EMX, but is not functional, it is +emulated by perl. To disable the emulations, set environment variable +C. + +=item * + +Here is the list of things which may be "broken" on EMX (from EMX docs): - - The functions recvmsg(), sendmsg(), and socketpair() are not - implemented. - - sock_init() is not required and not implemented. - - flock() is not yet implemented (dummy function). - - kill: - Special treatment of PID=0, PID=1 and PID=-1 is not implemented. - - waitpid: +=over 4 + +=item * + +The functions L, L, and L are not +implemented. + +=item * + +L is not required and not implemented. + +=item * + +L is not yet implemented (dummy function). (Perl has a workaround.) + +=item * + +L: Special treatment of PID=0, PID=1 and PID=-1 is not implemented. + +=item * + +L: + WUNTRACED Not implemented. waitpid() is not implemented for negative values of PID. +=back + Note that C does not work with the current version of EMX. -=item +=item * Since F is used for globing (see L), the bugs of F plague perl as well. In particular, uppercase letters do not work in C<[...]>-patterns with -the current C. +the current pdksh. + +=item * + +Unix-domain sockets on OS/2 live in a pseudo-file-system C. +To avoid a failure to create a socket with a name of a different form, +C<"/socket/"> is prepended to the socket name (unless it starts with this +already). + +This may lead to problems later in case the socket is accessed via the +"usual" file-system calls using the "initial" name. + +=item * + +Apparently, IBM used a compiler (for some period of time around '95?) which +changes FP mask right and left. This is not I bad for IBM's +programs, but the same compiler was used for DLLs which are used with +general-purpose applications. When these DLLs are used, the state of +floating-point flags in the application is not predictable. + +What is much worse, some DLLs change the floating point flags when in +_DLLInitTerm() (e.g., F). This means that even if you do not I +any function in the DLL, just the act of loading this DLL will reset your +flags. What is worse, the same compiler was used to compile some HOOK DLLs. +Given that HOOK dlls are executed in the context of I the applications +in the system, this means a complete unpredictablity of floating point +flags on systems using such HOOK DLLs. E.g., F of B +origin changes the floating point flags on each write to the TTY of a VIO +(windowed text-mode) applications. + +Some other (not completely debugged) situations when FP flags change include +some video drivers (?), and some operations related to creation of the windows. +People who code B may have more experience on this. + +Perl is generally used in the situation when all the floating-point +exceptions are ignored, as is the default under EMX. If they are not ignored, +some benign Perl programs would get a C and would die a horrible death. + +To circumvent this, Perl uses two hacks. They help against I type of +damage only: FP flags changed when loading a DLL. + +One of the hacks is to disable floating point exceptions on startup (as +is the default with EMX). This helps only with compile-time-linked DLLs +changing the flags before main() had a chance to be called. + +The other hack is to restore FP flags after a call to dlopen(). This helps +against similar damage done by DLLs _DLLInitTerm() at runtime. Currently +no way to switch these hacks off is provided. =back @@ -1086,12 +1418,87 @@ a dummy implementation. C special-cases F and F. +=item C, C + +these EMX functions do not work if the path contains a trailing C. +Perl contains a workaround for this. + +=item C + +Since L is present in EMX, but is not functional, it is +emulated by perl. To disable the emulations, set environment variable +C. + +=back + +=head2 Identifying DLLs + +All the DLLs built with the current versions of Perl have ID strings +identifying the name of the extension, its version, and the version +of Perl required for this DLL. Run C to find this +info. + +=head2 Centralized management of resources + +Since to call certain OS/2 API one needs to have a correctly initialized +C subsystem, OS/2-specific extensions may require getting Cs and +Cs. If an extension would do it on its own, another extension could +fail to initialize. + +Perl provides a centralized management of these resources: + +=over + +=item C + +To get the HAB, the extension should call C in C. After +this call is performed, C may be accessed as C. There is +no need to release the HAB after it is used. + +If by some reasons F cannot be included, use + + extern int Perl_hab_GET(void); + +instead. + +=item C + +There are two cases: + +=over + +=item * + +the extension needs an C only because some API will not work otherwise. +Use C below. + +=item * + +the extension needs an C since it wants to engage in a PM event loop. +Use C below. + +=back + +To get an C, the extension should call C in C. +After this call is performed, C may be accessed as C. + +To signal to Perl that HMQ is not needed any more, call +C. Perl process will automatically morph/unmorph itself +into/from a PM process if HMQ is needed/not-needed. Perl will automatically +enable/disable C message during shutdown if the message queue is +served/not-served. + +B. If during a shutdown there is a message queue which did not disable +WM_QUIT, and which did not process the received WM_QUIT message, the +shutdown will be automatically cancelled. Do not call C +unless you are going to process messages on an orderly basis. + =back =head1 Perl flavors Because of idiosyncrasies of OS/2 one cannot have all the eggs in the -same basket (though C environment tries hard to overcome this +same basket (though EMX environment tries hard to overcome this limitations, so the situation may somehow improve). There are 4 executables for Perl provided by the distribution: @@ -1099,59 +1506,64 @@ executables for Perl provided by the distribution: The main workhorse. This is a chimera executable: it is compiled as an C-style executable, but is linked with C-style dynamic -library F, and with dynamic B DLL. This executable is a -C application. +library F, and with dynamic CRT DLL. This executable is a +VIO application. -It can load perl dynamic extensions, and it can fork(). Unfortunately, -with the current version of B it cannot fork() with dynamic -extensions loaded (may be fixed by patches to B). +It can load perl dynamic extensions, and it can fork(). B Keep in mind that fork() is needed to open a pipe to yourself. =head2 F -This is a statically linked C-style executable. It can fork(), -but cannot load dynamic Perl extensions. The supplied executable has a -lot of extensions prebuilt, thus there are situations when it can -perform tasks not possible using F, like fork()ing when -having some standard extension loaded. This executable is a C +This is a statically linked C-style executable. It cannot +load dynamic Perl extensions. The executable supplied in binary +distributions has a lot of extensions prebuilt, thus the above restriction is +important only if you use custom-built extensions. This executable is a VIO application. -B A better behaviour could be obtained from C if it -were statically linked with standard I, but -dynamically linked with the I and C DLL. Then it would -be able to fork() with standard extensions, I would be able to -dynamically load arbitrary extensions. Some changes to Makefiles and -hint files should be necessary to achieve this. - -I The +I The friends locked into C world would appreciate the fact that this executable runs under DOS, Win0.3*, Win0.95 and WinNT with an appropriate extender. See L<"Other OSes">. =head2 F -This is the same executable as , but it is a C +This is the same executable as F, but it is a PM application. -B Usually C, C, and C of a C -application are redirected to C. However, it is possible to see +B Usually (unless explicitly redirected during the startup) +STDIN, STDERR, and STDOUT of a PM +application are redirected to F. However, it is possible to I them if you start C from a PM program which emulates a -console window, like I of C or C. Thus it I of Emacs or EPM. Thus it I to use Perl debugger (see L) to debug your PM -application. +application (but beware of the message loop lockups - this will not +work if you have a message queue to serve, unless you hook the serving +into the getc() function of the debugger). + +Another way to see the output of a PM program is to run it as + + pm_prog args 2>&1 | cat - + +with a shell I from F, so that it does not create +a link between a VIO session and the session of C. (Such a link +closes the VIO window.) E.g., this works with F - or with Perl! + + open P, 'pm_prog args 2>&1 |' or die; + print while

; -This flavor is required if you load extensions which use C, like -the forthcoming C. +The flavor F is required if you want to start your program without +a VIO window present, but not Ced (run C for more info). +Very useful for extensions which use PM, like C or C. =head2 F This is an C-style executable which is dynamically linked to -F and C DLL. I know no advantages of this executable +F and CRT DLL. I know no advantages of this executable over C, but it cannot fork() at all. Well, one advantage is that the build process is not so convoluted as with C. -It is a C application. +It is a VIO application. =head2 Why strange names? @@ -1168,69 +1580,102 @@ digits (which have absolutely different semantics). Well, having several executables dynamically linked to the same huge library has its advantages, but this would not substantiate the -additional work to make it compile. The reason is stupid-but-quick -"hard" dynamic linking used by OS/2. +additional work to make it compile. The reason is the complicated-to-developers +but very quick and convenient-to-users "hard" dynamic linking used by OS/2. + +There are two distinctive features of the dyna-linking model of OS/2: +all the references to external functions are resolved at the compile time; +there is no runtime fixup of the DLLs after they are loaded into memory. +The first feature is an enormous advantage over other models: it avoids +conflicts when several DLLs used by an application export entries with +the same name. In such cases "other" models of dyna-linking just choose +between these two entry points using some random criterion - with predictable +disasters as results. But it is the second feature which requires the build +of F. The address tables of DLLs are patched only once, when they are -loaded. The addresses of entry points into DLLs are guaranteed to be -the same for all programs which use the same DLL, which reduces the -amount of runtime patching - once DLL is loaded, its code is -read-only. - -While this allows some performance advantages, this makes life -terrible for developers, since the above scheme makes it impossible -for a DLL to be resolved to a symbol in the .EXE file, since this -would need a DLL to have different relocations tables for the -executables which use it. +loaded. The addresses of the entry points into DLLs are guaranteed to be +the same for all the programs which use the same DLL. This removes the +runtime fixup - once DLL is loaded, its code is read-only. -However, a Perl extension is forced to use some symbols from the perl -executable, say to know how to find the arguments provided on the perl -internal evaluation stack. The solution is that the main code of -interpreter should be contained in a DLL, and the F<.EXE> file just loads -this DLL into memory and supplies command-arguments. +While this allows some (significant?) performance advantages, this makes life +much harder for developers, since the above scheme makes it impossible +for a DLL to be "linked" to a symbol in the F<.EXE> file. Indeed, this +would need a DLL to have different relocations tables for the +(different) executables which use this DLL. + +However, a dynamically loaded Perl extension is forced to use some symbols +from the perl +executable, e.g., to know how to find the arguments to the functions: +the arguments live on the perl +internal evaluation stack. The solution is to put the main code of +the interpreter into a DLL, and make the F<.EXE> file which just loads +this DLL into memory and supplies command-arguments. The extension DLL +cannot link to symbols in F<.EXE>, but it has no problem linking +to symbols in the F<.DLL>. This I increases the load time for the application (as well as -the number of problems during compilation). Since interpreter is in a DLL, -the C is basically forced to reside in a DLL as well (otherwise -extensions would not be able to use C). +complexity of the compilation). Since interpreter is in a DLL, +the C RTL is basically forced to reside in a DLL as well (otherwise +extensions would not be able to use CRT). There are some advantages if +you use different flavors of perl, such as running F and +F simultaneously: they share the memory of F. + +B. There is one additional effect which makes DLLs more wasteful: +DLLs are loaded in the shared memory region, which is a scarse resource +given the 512M barrier of the "standard" OS/2 virtual memory. The code of +F<.EXE> files is also shared by all the processes which use the particular +F<.EXE>, but they are "shared in the private address space of the process"; +this is possible because the address at which different sections +of the F<.EXE> file are loaded is decided at compile-time, thus all the +processes have these sections loaded at same addresses, and no fixup +of internal links inside the F<.EXE> is needed. + +Since DLLs may be loaded at run time, to have the same mechanism for for DLLs +one needs to have the address range of I DLLs in the +system to be available I which did not load a particular +DLL yet. This is why the DLLs are mapped to the shared memory region. =head2 Why chimera build? -Current C environment does not allow DLLs compiled using Unixish -C format to export symbols for data. This forces C-style -compile of F. +Current EMX environment does not allow DLLs compiled using Unixish +C format to export symbols for data (or at least some types of +data). This forces C-style compile of F. -Current C environment does not allow F<.EXE> files compiled in +Current EMX environment does not allow F<.EXE> files compiled in C format to fork(). fork() is needed for exactly three Perl operations: =over 4 -=item explicit fork() +=item * -in the script, and +explicit fork() in the script, -=item open FH, "|-" +=item * -=item open FH, "-|" +C -opening pipes to itself. +=item * + +C, in other words, opening pipes to itself. =back -While these operations are not questions of life and death, a lot of -useful scripts use them. This forces C-style compile of +While these operations are not questions of life and death, they are +needed for a lot of +useful scripts. This forces C-style compile of F. =head1 ENVIRONMENT -Here we list environment variables with are either OS/2-specific, or -are more important under OS/2 than under other OSes. +Here we list environment variables with are either OS/2- and DOS- and +Win*-specific, or are more important under OS/2 than under other OSes. =head2 C -Specific for OS/2. Should have the form +Specific for EMX port. Should have the form path1;path2 @@ -1243,28 +1688,56 @@ substituted with F. Should be used if the perl library is moved from the default location in preference to C, since this would not leave wrong -entries in <@INC>. +entries in @INC. For example, if the compiled version of perl looks for @INC +in F, and you want to install the library in +F, do + + set PERLLIB_PREFIX=f:/perllib/lib;h:/opt/gnu + +This will cause Perl with the prebuilt @INC of + + f:/perllib/lib/5.00553/os2 + f:/perllib/lib/5.00553 + f:/perllib/lib/site_perl/5.00553/os2 + f:/perllib/lib/site_perl/5.00553 + . + +to use the following @INC: + + h:/opt/gnu/5.00553/os2 + h:/opt/gnu/5.00553 + h:/opt/gnu/site_perl/5.00553/os2 + h:/opt/gnu/site_perl/5.00553 + . =head2 C -If 1, perl ignores setlocale() failing. May be useful with some +If 0, perl ignores setlocale() failing. May be useful with some strange Is. =head2 C -If 1, perl would not warn of in case of unwarranted free(). May be -useful in conjunction with the module DB_File, since Berkeley DB -memory handling code is buggy. +If 0, perl would not warn of in case of unwarranted free(). With older +perls this might be +useful in conjunction with the module DB_File, which was buggy when +dynamically linked and OMF-built. + +Should not be set with newer Perls, since this may hide some I problems. =head2 C -Specific for OS/2. Gives the directory part of the location for +Specific for EMX port. Gives the directory part of the location for F. +=head2 C + +Specific for EMX port. Since L is present in EMX, but is not +functional, it is emulated by perl. To disable the emulations, set +environment variable C. + =head2 C or C -Specific for OS/2. Used as storage place for temporary files, most -notably C<-e> scripts. +Specific for EMX port. Used as storage place for temporary files. =head1 Evolution @@ -1278,18 +1751,47 @@ ports by Andreas Kaiser. See C<"setpriority, getpriority">. =head2 DLL name mangling With the release 5.003_01 the dynamically loadable libraries -should be rebuilt. In particular, DLLs are now created with the names +should be rebuilt when a different version of Perl is compiled. In particular, +DLLs (including F) are now created with the names which contain a checksum, thus allowing workaround for OS/2 scheme of caching DLLs. +It may be possible to code a simple workaround which would + +=over + +=item * + +find the old DLLs looking through the old @INC; + +=item * + +mangle the names according to the scheme of new perl and copy the DLLs to +these names; + +=item * + +edit the internal C tables of DLL to reflect the change of the name +(probably not needed for Perl extension DLLs, since the internally coded names +are not used for "specific" DLLs, they used only for "global" DLLs). + +=item * + +edit the internal C tables and change the name of the "old" +F to the "new" F. + +=back + =head2 Threading -As of release 5.003_01 perl is linked to multithreaded C -DLL. Perl itself is not multithread-safe, as is not perl +As of release 5.003_01 perl is linked to multithreaded C RTL +DLL. If perl itself is not compiled multithread-enabled, so will not be perl's malloc(). However, extensions may use multiple thread on their own risk. -Needed to compile C for C out-of-the-box. +This was needed to compile C for XFree86-OS/2 out-of-the-box, and +link with DLLs for other useful libraries, which typically are compiled +with C<-Zmt -Zcrtdll>. =head2 Calls to external programs @@ -1299,19 +1801,21 @@ external program I, the F will be called, or whatever is the override, see L<"PERL_SH_DIR">. Thus means that you need to get some copy of a F as well (I -use one from pdksh). The drive F: above is set up automatically during +use one from pdksh). The path F above is set up automatically during the build to a correct value on the builder machine, but is overridable at runtime, B a consensus on C was that perl should use one non-overridable shell per platform. The obvious choices for OS/2 are F and F. Having perl build itself would be impossible -with F as a shell, thus I picked up C. Thus assures almost -100% compatibility with the scripts coming from *nix. +with F as a shell, thus I picked up C. This assures almost +100% compatibility with the scripts coming from *nix. As an added benefit +this works as well under DOS if you use DOS-enabled port of pdksh +(see L<"Prerequisites">). -B currently F of C calls external programs +B currently F of pdksh calls external programs via fork()/exec(), and there is I functioning exec() on -OS/2. exec() is emulated by EMX by asyncroneous call while the caller +OS/2. exec() is emulated by EMX by an asynchronous call while the caller waits for child completion (to pretend that the C did not change). This means that 1 I copy of F is made active via fork()/exec(), which may lead to some resources taken from the system (even if we do @@ -1339,17 +1843,32 @@ If you have some working code for C, please send it to me, I will include it into distribution. I have no need for such a module, so cannot test it. +For the details of the current situation with calling external programs, +see L. Set us mention a couple +of features: + +=over 4 + +=item * + +External scripts may be called by their basename. Perl will try the same +extensions as when processing B<-S> command-line switch. + +=item * + +External scripts starting with C<#!> or C will be executed directly, +without calling the shell, by calling the program specified on the rest of +the first line. + +=back + =head2 Memory allocation Perl uses its own malloc() under OS/2 - interpreters are usually malloc-bound -for speed, but perl is not, since its malloc is lightning-fast. -Unfortunately, it is also quite frivolous with memory usage as well. - -Since kitchen-top machines are usually low on memory, perl is compiled with -all the possible memory-saving options. This probably makes perl's -malloc() as greedy with memory as the neighbor's malloc(), but still -much quickier. Note that this is true only for a "typical" usage, -it is possible that the perl malloc will be worse for some very special usage. +for speed, but perl is not, since its malloc is lightning-fast. +Perl-memory-usage-tuned benchmarks show that Perl's malloc is 5 times quicker +than EMX one. I do not have convincing data about memory footprint, but +a (pretty random) benchmark showed that Perl's one is 5% better. Combination of perl's malloc() and rigid DLL name resolution creates a special problem with library functions which expect their return value to @@ -1358,6 +1877,31 @@ such functions, system memory-allocation functions are still available with the prefix C added. (Currently only DLL perl has this, it should propagate to F shortly.) +=head2 Threads + +One can build perl with thread support enabled by providing C<-D usethreads> +option to F. Currently OS/2 support of threads is very +preliminary. + +Most notable problems: + +=over 4 + +=item C + +may have a race condition. Needs a reimplementation (in terms of chaining +waiting threads, with the linked list stored in per-thread structure?). + +=item F + +has a couple of static variables used in OS/2-specific functions. (Need to be +moved to per-thread structure, or serialized?) + +=back + +Note that these problems should not discourage experimenting, since they +have a low probability of affecting small programs. + =cut OS/2 extensions @@ -1370,7 +1914,8 @@ there are OS2::ExtAttr, OS2::PrfDB for tied access to EAs and .INI files - and maybe some other extensions at the time you read it. Note that OS2 perl defines 2 pseudo-extension functions -OS2::Copy::copy and DynaLoader::mod2fname. +OS2::Copy::copy and DynaLoader::mod2fname (many more now, see +L). The -R switch of older perl is deprecated. If you need to call a REXX code which needs access to variables, include the call into a REXX compartment