Explicit Linking of a Shared Library Using dlopen

The following procedure enables a shared program to load a shared library explicitly.

Linking a Shared Library Using dlopen

1. Create the library file.

   Copy the libdyn2.c file into the libshared2dir directory and rename it libshared2.c. The following Imakefile will build a shared library called libshared2.so:

   FPIC = ON
   SRCS = libshared2.c
   SharedLibraryTarget (libshared2.so, libshared2.o,,,,)
   Depend($(SRCS))

2. Create the program file.

   Copy the progdyn2.c file into the progshared2dir directory and rename it progshared2.c. The following Imakefile will build a PIC binary object file called progshared2.o and an executable file called progshared2

   FPIC = ON
   SRCS = progshared2.c
   SharedUserTarget (progshared2_u, progshared2.o,
       $(UTILS_LIB) $(CLX_UTILS_LIB),,,)
   Depend($(SRCS))

3. Copy the application.

   Copy the shared application into the /bin subdirectory of the chorus_root_directory directory:

   % cp $WORK/progshared2dir/progshared2_u chorus_root_directory/bin

4. Copy the shared library.

   Copy the shared library into the /lib subdirectory of the chorus_root_directory directory:

   % cp $WORK/libshared2dir/libshared2.so chorus_root_directory/lib

5. Notify the runtime linker.

   The following command will notify the runtime linker where to find the libshared2.so shared library:

   % rsh jericho setenv LD_LIBRARY_PATH /lib/shared:/lib

   Alternatively, set the runpath to /lib in the ldopts argument of the program macro (-rpath /lib).

6. Start the program.

   The following command will start the program and load the libshared2.so and libc.so libraries (if they have not already been loaded by another actor):

   % rsh jericho /bin/progshared2