Do we need to symbolically linking /lib/security/pam_pwdb.so to create library for use with JNI, Java?

["Tran, Canh" <canh.tran@intel.com>]

	I wrote a file called pamcode.c where 

	Pamcode.c
	#include <security/pam_appl.h>
	#include <security/pam_misc.h>

	.............................
	int retval;
	struct pam_conv conv = {
	      misc_conv,
	      NULL
	}

	retval = pam_start("check_user", username, &conv, &pamh);
	retval = pam_authenticate(pamh, 0);
	.............................

	On command line, if I create binary with command 
	>> cc pam_code.c -lpam -lpam_misc -ldl

	Then, a.out is created and I can run it by ./a.out with no errors
reported.

	However, if I try to build a library by having following line in
makefile:

	Makefile
	..................
	ld -G -dy -o   libauthentication.so    pam_code.o    -lpam
-lpam_misc -ldl
	..................

	and then, having this library loaded into Java code as:

	javacode.java
	......................................
	System.LoadLibrary("authentication");
	......................................

	Then, at runtime, I get an error 28 "Module is unknown" (static
	 libs) from somewhere inside pam_pwdb.so
	 
	    I've discovered that the dlopen() call in pam_pwdb.so is
	 failing with this error "/lib/security/pam_pwdb.so: undefined
	 symbol: pam_get_item".  
	 
	 /lib/security/pam_pwdb.so exists.  The /etc/pam.d/check_user file
is
	 a symbolic link to /etc/pam.d/passwd, and passwd works fine
	++++++++++++++++++++++++
	However, if I change the makefile above to following:
	Makefile
	..................
	ld -G -dy -o   libauthentication.so    pam_code.o
/lib/security/pam_pwdb.so  -lpam -lpam_misc -ldl
	..................

	Essentially, symbolically linking the /lib/security/pam_pwdb.so to
the libpam and libpammisc library,
	Then, everything's fine afterward (i.e: no runtime errors are
reported, and I can make call from
	Java code.

	Any suggestion? Ideally, I prefer not to have
/lib/security/pam_pwdb.so symbolically linked with the 2 pam libraries, but
for now, that's the only way to make it work.

	Thanks.

	Canh.