Shared Library Management Routines

The shl_load Shared Library Management Routines

However, programs are not restricted to using shared libraries only in that situation. For example, rather than linking with any required libraries, a program could explicitly load libraries as they are needed. One possible reason for doing this is to minimize virtual memory overhead. To keep virtual memory resource usage to a minimum, a program could load libraries with shl_load and unload with shl_unload when the library is no longer needed. However, it is normally not necessary to incur the programming overhead of loading and unloading libraries yourself for the sole reason of managing system resources.

Note that if shared library initializers have been declared for an explicitly loaded library, they are called after the library is loaded. For details, see “Initializers for Shared Libraries”.

To explicitly load a shared library, use the shl_load routine. If loading a C++ library, use the cxxshl_load routine. This ensures that constructors of nonlocal static objects are executed when the library is loaded. The syntax of cxxshl_load is the same as that of shl_load.

In 64-bit mode, shl_load lets you load a compatibility or standard mode shared libraries. The BIND_BREADTH_FIRST flag overrides the default depth-first loading mechanism.

shl_load Usage

Since the library was not specified at link time, the program must get the library name at run time. Here are some practical ways to do this:

Hard-code the library name into the program (the easiest method).

Get the library name from an environment variable using the getenv library routine (see getenv(3C)).

Get the library path name from the command line through argv.

Read the library name from a configuration file.

Prompt for the library path name at run time.

If successful, shl_load returns a shared library handle (of type shl_t), which uniquely identifies the library. This handle can then be passed to the shl_findsym or shl_unload routine.

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Chapter 6

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Kenwood HP 9000 manual Shlload Usage, 218

HP 9000 specifications

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