loading modules for running programs

michalbella · 11-12-2001, 06:26 AM

I want to load a library while the program is running, something like in linux-kernel (loading modules); (C/C++ under RH/Linux)
does anybody "know how" ?

isajera · 11-12-2001, 01:31 PM

well.. if it's a kernel module, then you use insmod to load it. if you're talking about a library, then it needs to be dynamically linked against a program at compile time to be loaded during runtime.

crabboy · 11-12-2001, 04:49 PM

Try this example:

Code:

/* test.h */

void test();

Code:

/* test.c */

#include <stdio.h>
#include "test.h"

void test()
{
   printf("Hello dude");
}

Code:

/* loadtest.c */

#include <stdio.h>

#include "test.h"

main()
{
   test();
}

Build Commands:

Code:

# pwd
/home/whatever/src/shared
# cc -c -shared test.c
# cc -shared -W1,-soname,libtest.so -o libtest.so test.o
# cc loadtest.c -o loadtest -L. -ltest
# export LD_LIBRARY_PATH=/home/whatever/src/shared
# ./loadtest
Hello dude

Hope this helps. Hope this works...

Gary

crabboy · 11-12-2001, 04:55 PM

Quick test:

Code:

# mv libtest.so libtest.dude
# ./loadtest
./loadtest: error in loading shared libraries: libtest.so: cannot 
open shared object file: No such file or directory
# mv libtest.dude libtest.so