loading library

loading library

Post by kelvi » Mon, 14 Aug 2000 04:00:00

  How can I reload a shared library from my C program
again if the shared library exit after my program
loaded it.



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1. Loading libries which load libraries


I've a problem with UNIX library dependencies.

I wrote a program on HPUX. It loads a library "libBVJC_API.sl", which in
turn loads other libraries. One of these libraries that gets (eventually)
loaded is "libITdummytls.sl".

My program compiles and links without problem, but executing it gives loads
of runtime errors (from the line that actually loads "libBVJC_API.sl") like
the following:

aCC runtime: Error 215 from
/usr/lib/dld.sl: Unresolved symbol: do_ipfx__7istreamFi (code)  from
/usr/lib/dld.sl: Unresolved symbol: __dt__13Iostream_initFv (code)  from
/usr/lib/dld.sl: Unresolved symbol: __ct__13Iostream_initFv_1 (code)  from

I ran "chatr" (a program like Windows' quickview, but for HPUX) on
libITdummytls.sl , to see what libraries it was linked with. It did not
mention any dependent libraries. (See output below...)

$ chatr /opt/bv1to1/orbix/lib/libITdummytls.sl
                shared library
                shared library dynamic path search:
                    SHLIB_PATH     disabled  second
                    embedded path  disabled  first  Not Defined
                shared vtable support disabled
                static branch prediction disbaled
                executable from stack: D (default)
                kernel assisted branch prediction enabled
                lazy swap allocation disabled
                text segment locking disabled
                data segment locking disabled
                data page size: D (default)
                instruction page size: D (default)

I then did a grep command, to see what libraries contain strings matching
the missing symbols. A few do, so I put their paths on LD_LIBRARY_PATH and
SHLIB_PATH. This made no difference.

Not knowing much about the behaviour of UNIX libraries, I'm at a loss as to
what could possibly be the matter here. Can anybody suggest anything
(nomatter how unlikely)?


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