I am writing a kernel extension in AIX 6.1. I use the "kget_proc_info()" for getting info of a process. But there is a error when I make it:
1>ld : 0711-317 error : Undefined symbol: .kget_proc_info
And I use command "nm" to check this symbol：
#nm -A -X64 /unix | grep kget_proc_info
/unix: .kget_proc_info T 3702624
/unix: kget_proc_info D 45909296 24
I can't understand the difference between ".kget_proc_info" and "kget_proc_info".
How to solve this problem?
You don't actually "link to" the kernel. Instead, you tell the loader, "this list of symbols will be resolved by /unix" and that list comes from kernex.exp. You do that with -bIkernex.exp. The book will help. There are also bos.adt.samples that give you (some very dated) examples.
Related
If I ever have an error during a build, I see it twice
# ghc (for _build/lib/WCLoan.o)
# ghc (for _build/lib/WCLoan.o)
[2 of 2] Compiling WCLoan ( src/WCLoan.hs, _build/lib/WCLoan.o )
src/WCLoan.hs:18:1: error:
Parse error: module header, import declaration
or top-level declaration expected.
|
18 | imAnError
| ^^^^^^^^^
Error when running Shake build system:
* _build/lib/WCLoan.o
user error (Development.Shake.cmd, system command failed
Command: ghc -this-unit-id wcloan-0.0.1 src/WCLoan.hs -outputdir_build/lib -isrc:app:test -dynamic-too -O2 -j12 -fPIC -Werror -Wall -package-name wcloan-0.0.1 '-package base
-4.12.0.0' '-package calc-0.0.1' '-package vector-0.12.0.3'
Exit code: 1
Stderr:
src/WCLoan.hs:18:1: error:
Parse error: module header, import declaration
or top-level declaration expected.
|
18 | imAnError
| ^^^^^^^^^
)
I see that the error occurs during build, then is also shown under the line
Error when running Shake build system:
Is there anything I can do to have it show only once?
The error messages are coming from two distinct locations:
The first one is being printed by a command that Shake runs and writes to stderr with an error message. When you do cmd ... Shake defaults to EchoStderr True (print out the stderr stream to the console), but you can pass EchoStderr False to not echo the stderr.
The second is an exception being bubbled up by Haskell, as a ShakeException, which then gets printed out at the end, and includes the stderr. When you do cmd ... Shake defaults to WithStderr True to include the stderr in the exception, and you can pass WithStderr False to not include the stderr in the exception.
However, because of the way Shake works, you may find that the error message comes out quite a long way before the end of the full Shake command. Therefore, I recommend leaving WithStderr as it is, if you do want to see stderr only once.
My main question: Please may you list a few examples of what SDL_GetError would print?
I want to use SDL_GetError to help me debug, however I don't know what to expect or how to create my own intentional errors.
The libsdl wiki says:
The message is only applicable when an SDL function has signaled an
error. You must check the return values of SDL function calls to determine
when to appropriately call SDL_GetError().
however http://sdl.beuc.net/sdl.wiki/SDL_GetError says:
Although this example uses SDL_Init, SDL_GetError provides an error
message for any failed SDL operation.
so which is it? Only some or all? None of the SDL wikis/documentations I have seen give a list of example error messages, so I don't know how to initiate an error, or what to expect in terms of content and format. Is
Error in `./foo': double free or corruption (top):
an SDL_GetError message or is that caused by something else?
The wiki entry for SDL_Error lists the error strings:
SDL_errorcode | The corresponding error string
SDL_ENOMEM | Out of memory
SDL_EFREAD | Error reading from datastream
SDL_EFWRITE | Error writing to datastream
SDL_EFSEEK | Error seeking in datastream
SDL_UNSUPPORTED | Unknown SDL error
SDL_LASTERROR | Unknown SDL error
any other value | Unknown SDL error
See also SDL_error.c. One of the wiki entries seems to be incorrect. The correct error code - error string pair would be:
SDL_UNSUPPORTED | That operation is not supported
You can set custom errors messages with SDL_SetError - see the .c above. Finally, "double free or corruption" is not an error caused by SDL, but most likely by a double free. I suggest gdb/valgrind to debug it.
I've been compiling OpenSSL (and thus Perl >5.10, as it is a dependency) on multiple platforms. I've managed to get 1.1.0b compiled on every single platform except AIX, which I can't even compile Perl. I've tried several versions and looked at the documentation Perl provides online. From what I can tell, it suggests version 5.12.2.
When I attempt to compile version 5.12.2,
I take the following from the documentation, and fill in a few local system variables, such as using XLC rv7.
export OBJECT_MODE=64
./Configure \
-d \
-Dcc=/usr/vac/bin/xlc_r7 \
-Duseshrplib \
-Duse64bitall \
-Dprefix=`pwd`/../PERL
Then I attempt to make as prompted, and get the following error:
/usr/vac/bin/xlc_r7 -q64 -o miniperl -brtl -bdynamic -L/usr/local/lib -b64 gv.o toke.o perly.o pad.o regcomp.o dump.o util.o mg.o reentr.o mro.o hv.o av.o run.o pp_hot.o sv.o pp.o scope.o pp_ctl.o pp_sys.o doop.o doio.o regexec.o utf8.o taint.o deb.o universal.o globals.o perlio.o perlapi.o numeric.o mathoms.o locale.o pp_pack.o pp_sort.o miniperlmain.o opmini.o perlmini.o -lbind -lnsl -ldl -lld -lm -lcrypt -lc
LIBPATH=.../perl-5.12.2 ./miniperl -w -Ilib -MExporter -e '<?>' || make minitest
LIBPATH=.../perl-5.12.2 ./miniperl -Ilib autodoc.pl
/usr/bin/ln -s perl5122delta.pod pod/perldelta.pod
LIBPATH=.../perl-5.12.2 ./miniperl -Ilib -Icpan/Cwd -Icpan/Cwd/lib pod/perlmodlib.PL -q
readdir(./../../../../..): Bad file number at lib/FindBin.pm line 116
stat(/pod/): No such file or directory at lib/FindBin.pm line 197
stat(/pod/): No such file or directory at lib/FindBin.pm line 200
Use of chdir('') or chdir(undef) as chdir() is deprecated at pod/perlmodlib.PL line 9.
No such file or directory at pod/perlmodlib.PL line 19.
make: The error code from the last command is 2.
Taking a look at pod/perlmodlib.PL, we see the following:
# MANIFEST itself is Unix style filenames, so we have to assume that Unix style
# filenames will work.
open (MANIFEST, "../MANIFEST") or die $!;
In my desperation I tried to hack it up and avoid writing to the manifest, but then I get this issue:
Creating Makefile.PL in cpan/Archive-Extract for Archive::Extract
Running Makefile.PL in cpan/Archive-Extract
../../miniperl Makefile.PL INSTALLDIRS=perl INSTALLMAN1DIR=none INSTALLMAN3DIR=none PERL_CORE=1 LIBPERL_A=libperl.a
readdir(./../../../../../../..): No such file or directory at ../../lib/File/Find.pm line 610
Use of chdir('') or chdir(undef) as chdir() is deprecated at ../../lib/File/Find.pm line 773.
readdir(./../../..): No such file or directory at ../../cpan/Cwd/lib/File/Spec/Unix.pm line 483
Could not open 'lib/Archive/Extract.pm': No such file or directory at ../../cpan/ExtUtils-MakeMaker/lib/ExtUtils/MM_Unix.pm line 2588.
512 from cpan/Archive-Extract's Makefile.PL at make_ext.pl line 390.
Warning: No Makefile!
make: Cannot find a rule to create target config from dependencies.
Stop.
make config PERL_CORE=1 LIBPERL_A=libperl.a failed, continuing anyway...
Making all in cpan/Archive-Extract
make all PERL_CORE=1 LIBPERL_A=libperl.a
make: Cannot find a rule to create target all from dependencies.
Stop.
Unsuccessful make(cpan/Archive-Extract): code=512 at make_ext.pl line 449.
make: The error code from the last command is 2.
The frequency of errors makes me feel like perhaps I don't have something configured right...
My next thought was to try the most updated version, which at the time of writing is 5.24. Using the same configuration and attempting to make I get the following issue:
Can't locate strict.pm in #INC (you may need to install the strict module) (#INC contains: /cpan/AutoLoader/lib /dist/Carp/lib /dist/PathTools /dist/PathTools/lib /cpan/ExtUtils-Install/lib /cpan/ExtUtils-MakeMaker/lib /cpan/ExtUtils-Manifest/lib /cpan/File-Path/lib /ext/re /dist/Term-ReadLine/lib /dist/Exporter/lib /ext/File-Find/lib /cpan/Text-Tabs/lib /dist/constant/lib /cpan/version/lib /lib .) at autodoc.pl line 25.
BEGIN failed--compilation aborted at autodoc.pl line 25.
make: The error code from the last command is 2.
Which I know from other compilations means I need to edit the PERL5LIB variable.
If I keep adding all the modules to the path:
export PERL5LIB=`pwd`/dist/Exporter/lib:$PERL5LIB
export PERL5LIB=`pwd`/cpan/Text-Tabs/lib:$PERL5LIB
export PERL5LIB=`pwd`/ext/re:$PERL5LIB
export PERL5LIB=`pwd`/dist/constant/lib:$PERL5LIB
export PERL5LIB=`pwd`/cpan/ExtUtils-MakeMaker/lib:$PERL5LIB
export PERL5LIB=`pwd`/dist/Carp/lib:$PERL5LIB
export PERL5LIB=`pwd`/cpan/File-Path/lib:$PERL5LIB
export PERL5LIB=`pwd`/dist/PathTools:$PERL5LIB
export PERL5LIB=`pwd`/dist/PathTools/lib:$PERL5LIB
export PERL5LIB=`pwd`/ext/File-Find/lib:$PERL5LIB
Even so, I'll still get an error for a module that isn't even present in the 5.24.0 source!
Can't locate ExtUtils/MakeMaker/version/vpp.pm in #INC (you may need to install the ExtUtils::MakeMaker::version::vpp module) (#INC contains: <removed from post>) at (eval 2) line 2.
BEGIN failed--compilation aborted at (eval 2) line 2.
Compilation failed in require at .../perl-5.24.0/cpan/ExtUtils-MakeMaker/lib/ExtUtils/MakeMaker.pm line 10.
BEGIN failed--compilation aborted at .../perl-5.24.0/cpan/ExtUtils-MakeMaker/lib/ExtUtils/MakeMaker.pm line 10.
Compilation failed in require at Makefile.PL line 7.
BEGIN failed--compilation aborted at Makefile.PL line 7.
Unsuccessful Makefile.PL(cpan/Archive-Tar): code=512 at make_ext.pl line 517.
make: The error code from the last command is 2.
I have MakeMaker, but the 5.24 version does not contain vpp.pm! Again, in desperation I attempted to put it in there from a different source, and I get this error:
LIBPATH=.../perl-5.24.0 ./miniperl -Ilib make_ext.pl cpan/Archive-Tar/pm_to_blib MAKE="make" LIBPERL_A=libperl.a
readdir(./../../../../../../..): No such file or directory at .../perl-5.24.0/ext/File-Find/lib/File/Find.pm line 142.
Can't cd to : No such file or directory
Unsuccessful Makefile.PL(cpan/Archive-Tar): code=512 at make_ext.pl line 517.
make: The error code from the last command is 2.
All of this makes me feel like perhaps I'm not configuring something right... Can anyone with some experience help me out with some cut and dry installation instructions for Perl on AIX? I'd be super grateful. Thanks!
Below is some information about my system:
> prtconf
System Model: IBM,8231-E1D
Machine Serial Number: Not Available
Processor Type: Not Available
Processor Implementation Mode: POWER 7
Processor Version: PV_7_Compat
Number Of Processors: 0
Processor Clock Speed: Not Available
CPU Type: 64-bit
Kernel Type: 64-bit
Memory Size: 10240 MB
Good Memory Size: Not Available
Platform Firmware level: Not Available
Firmware Version: IBM,AL770_092
Console Login: disable
Auto Restart: true
Full Core: false
I pull down and compile openssh and openssl frequently. I use gcc and no real magic that I can recall.
Here is my script to build it. I don't know which perl is native to AIX but it seems to work for me.
https://github.com/pedz/aix-build-scripts/blob/master/build-scripts/build-openssl
I have a C program hello.c. I created a shared object hello.so.
hello.c and hello.so are in directory /u/grv/program/hello.c /u/grv/objects/hello.so respectively
LIBPATH is set to /u/grv/objects:$LIBPATH
when i use dbx to debug the code..dbx asks me to choose from a list of two so..
In all the directories of LIBPATH there is only one "hello.so" file..so where is the secound "so" file coming from?
here is the screen shot of dbx session:
(dbx) stop on load "hello.so"
[1] stop on load "hello.so"
(dbx) c
stop: loaded /u/grv/object/hello.so
[1] stopped in uload at 0x9fffffff0002024 ($t1)
0x9fffffff0002024 (uload+0x104) e8410028 ld r2,0x28(r1)
(dbx) stop in hello
1. hello.hello
2. glink64.hello
Select one or more of [1 - 2]:
Additional information:
genkld command does not the hello.so .. that means its not loaded..is this the reason why it is asking me to select..or there is any other reason..?
How to load a shared object so that it is shown in genkld list?
it is obvious that the library glink64 also contains an entry point called hello.
You might try changing the function name from hello to something more unique, then have your application call this new unique function name
I'm not familiar with the genkld utility so cannot help you there
I am trying to create a gem that wraps libpuzzle, but cannot figure out this flat_namespace issue:
--- personal/sayzame ‹master* M⁇› » gem build sayzame.gemspec && gem install sayzame-0.0.1.gem
Successfully built RubyGem
Name: sayzame
Version: 0.0.1
File: sayzame-0.0.1.gem
Building native extensions. This could take a while...
Successfully installed sayzame-0.0.1
1 gem installed
--- personal/sayzame ‹master* M⁇› » pry -rsayzame -Ilib
[1] pry(main)> Sayzame.compare_images :a, :b
dyld: lazy symbol binding failed: Symbol not found: _puzzle_init_dvec
Referenced from: /usr/local/lib/libpuzzle.dylib
Expected in: flat namespace
dyld: Symbol not found: _puzzle_init_dvec
Referenced from: /usr/local/lib/libpuzzle.dylib
Expected in: flat namespace
[1] 56394 trace trap pry -rsayzame -Ilib
My full source code here: https://github.com/neezer/sayzame
I'm fairly sure the problem is in my ext/puzzle/extconf.rb file, in that I am not linking the library correctly. I have already posted on ffi/ffi's issue tracker about it and followed up on those two leads with no success.
I would really appreciate any and all help here; been banging my head against the wall for quite sometime on this.
Possibly related:
- https://groups.google.com/d/msg/picky-ruby/8kuG8FkATgU/89JLc6U7SrcJ