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Full Discussion: Linkers and Loaders: how to (if possible) specify relative path for shared library to the loader
Top Forums Programming Linkers and Loaders: how to (if possible) specify relative path for shared library to the loader Post 302366233 by emitrax on Thursday 29th of October 2009 05:45:13 AM
Old 10-29-2009
Linkers and Loaders: how to (if possible) specify relative path for shared library to the loader
Hi,

first of all I apologize if this is not the right section to post this question, but I didn't
know where else to post it.

I've developed an application which uses a shared library developed by me.

Basically I want to give both the application and the shared library without the source,
and avoiding any installation process.

What I'd like to achieve is to provide a zip packet, which when unpacked, without doing
anything else, can run the application right away.

My problem is how to tell the loader to look for the shared library used in a relative path (perhaps the same of the application (working directory).

Usually you have to tell the loader which directory to look for for the library you want to use, by listing the directory in its .conf file (ld.so.conf), but I want to avoid this.

Is this possible to do? If so, how?

The working environment is of course Linux.

Any hint would be appreciated.

Regards,
S.
 

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LEARN ABOUT HPUX

shlib_debug_enable

shlib_debug_enable(5)						File Formats Manual					     shlib_debug_enable(5)

NAME

       shlib_debug_enable - dynamically enable or disable online shared library debugging support

VALUES

   Fail Safe
   Default
       semantics is disabled

   Allowed values
DESCRIPTION

       This  tunable  dynamically  enables  (1) or disables (0) the online shared library debugging feature.  When this tunable is enabled, shared
       libraries of a running (active) application can be debugged.

   Who Is Expected to Change This Tunable?
       System administrators and developers who want to change the default behavior of

   Restrictions on Changing
       Changes to this tunable take effect immediately.  There is no need to reboot the system.

   When Should the Tunable Be Turned On?
       When there is a need to debug a shared library of a running (active) application, this tunable can be turned on.

       When this feature/tunable is not enabled, debugging of shared libraries can be done at application start time  through  the  command.   See
       chatr(1).

   What Are the Side Effects of Turning the Tunable On?
       If  an application which is being debugged for shared libraries is not MPAS (Mostly Private Address Space) executable, then the application
       will be converted to an MPAS executable type.  After the conversion, all rules which apply to regular MPAS executable type  does  apply	to
       the converted application until the process exits.  The rules apply even after being detached from the debugger.

   When Should the Tunable Be Turned Off?
       Administrators and/or developers who will not need the online debugging feature of shared libraries.

   What Are the Side Effects of Turning the Tunable Off?
       When  this  tunable  is	disabled,  then online debugging of shared libraries will not be possible beyond the existing hardware break point
       facility.  With hardware break points, only a limited number of breakpoints can be set.

   What Other Tunables Should Be Changed at the Same Time?
       None.

WARNINGS

       All HP-UX kernel tunable parameters are release specific.  This parameter may be removed or have its meaning changed in future releases	of
       HP-UX.

       Installation  of  optional  kernel  software, from HP or other vendors, may cause changes to tunable parameter values.  After installation,
       some tunable parameters may no longer be at the default or recommended values.  For information about the effects of installation  on  tun-
       able  values,  consult  the documentation for the kernel software being installed.  For information about optional kernel software that was
       factory installed on your system, see at

AUTHOR

       was developed by HP.

SEE ALSO

       chatr(1).

HP Integrity Systems Only				     Tunable Kernel Parameters					     shlib_debug_enable(5)
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