topic Re: How compile a shared library ??? Help !!!! in Operating System - HP-UX

How compile a shared library ??? Help !!!!

Lorein — Tue, 27 Jan 2009 23:13:38 GMT

Hi

I have a progrma in C and I want to compile as a shared library.

My program name is shell.c and this is the code

#include
#include
#include

void sh(char *);

void sh( char *cmd )
{
int num;

num = system(cmd);
}

This is the correct way to compile a shell library ?

$ cc -b -c shell.c
$ ld -r -o shell.so shell.o

I'll call this library from an Oracle 10g procedure

Re: How compile a shared library ??? Help !!!!

Dennis Handly — Wed, 28 Jan 2009 02:18:55 GMT

Is this for PA or IPF?
$ cc -b +z shell.c

Re: How compile a shared library ??? Help !!!!

Lorein — Wed, 28 Jan 2009 19:48:30 GMT

Is Itanium.

Re: How compile a shared library ??? Help !!!!

Lorein — Wed, 28 Jan 2009 23:48:23 GMT

Let me add more detial.
I hava a HP-UX itanium 12.23 and the datbase is oracle 10g

When I compile the C programm I can create the .so (shared library) and .o files. But when I tried to call it from the procedure in oracle I receive an error. I think maybe i'm not compiling in the correct way.
I receive the next errors

ora-06520: PL/SQL: Error loading external library
ora-06522 '/oracle/SA_scripts/scripts/shell.so' is not a valid load module. Bad magic
number

Re: How compile a shared library ??? Help !!!!

Dennis Handly — Thu, 29 Jan 2009 00:31:35 GMT

>But when I tried to call it from the procedure in oracle I receive an error. I think maybe i'm not compiling in the correct way.

Oracle is 64 bit so your shlib must be compiled the same way.
$ cc -b +DD64 +z shell.c -o shell.so

>is not a valid load module. Bad magic number

Right I get the same thing:
dlopen error: './libdebug.so' is not a valid load module: Bad magic number
$ file a.out libdebug.so
a.out: ELF-32 executable object file - IA64
libdebug.so: ELF-64 shared object file - IA64

Re: How compile a shared library ??? Help !!!!

Lorein — Thu, 12 Feb 2009 00:01:33 GMT

Do you know what else I need to do?

What is the correct way to compile a shared library?

Thanks

Re: How compile a shared library ??? Help !!!!

Dennis Handly — Thu, 12 Feb 2009 00:39:29 GMT

>Do you know what else I need to do?
>What is the correct way to compile a shared library?

Unless you have a new error message or a different question, my answers are the same.

What does "file /oracle/SA_scripts/scripts/shell.so" show?

Re: How compile a shared library ??? Help !!!!

Lorein — Thu, 12 Feb 2009 15:45:12 GMT

Now I fixed the error of magic number , and I compile the library like you did:
$ cc -b +DD64 +z shell.c -o shell.so

My question now is how can I link this file? in order to create a shell.o

thanks!

Re: How compile a shared library ??? Help !!!!

Dennis Handly — Fri, 13 Feb 2009 03:32:07 GMT

>My question now is how can I link this file? in order to create a shell.o

This compiles and links and creates shell.so in one step.
If you need multiple steps:
cc -c +z sources ...
cc -b -o shell.so objects

Re: How compile a shared library ??? Help !!!!

Dennis Handly — Fri, 13 Feb 2009 03:39:08 GMT

It might be helpful to look at the documentation:
http://docs.hp.com/en/14487/libs.htm
http://docs.hp.com/en/14640/OnlineHelp/linkhelp.html

You can also use:
cc +help
ld +help

Re: How compile a shared library ??? Help !!!!

Lorein — Fri, 13 Feb 2009 15:38:54 GMT

Thanks let me try...

Re: How compile a shared library ??? Help !!!!

Dennis Handly — Fri, 13 Feb 2009 22:54:33 GMT

If you are happy with the answers you got, please read the following about assigning points:
http://forums.itrc.hp.com/service/forums/helptips.do?#33