Shared Library Management Routines

The shl_load Shared Library Management Routines

Description

To unload a shared library, use the shl_unload function. One reason to do this is to free up the private copy of shared library data and swap space allocated when the library was loaded with shl_load. (This is done automatically when a process exits.)

Another reason for doing this occurs if a program needs to replace a shared library. For example, suppose you implement some sort of shell or interpreter, and you want to load and execute user “programs” which are actually shared libraries. So you load one program, look up its entry point, and call it. Now you want to run a different program. If you do not unload the old one, its symbol definitions might get in the way of the new library. So you should unload it before loading the new library.

Note that if shared library initializers have been declared for a shared library, they will be called when the shared library is explicitly unloaded. For details, see “Initializers for Shared Libraries”.

If unloading a C++ library, use the cxxshl_unload routine. This ensures that destructors of nonlocal static objects are executed when the library is unloaded. The syntax of cxxshl_unload is the same as that of shl_unload.

Usage

When a library is unloaded, existing linkages to symbols in an unloaded library are not invalidated. Therefore, the programmer must ensure that the program does not reference symbols in an unloaded library as undefined behavior will result. In general, this routine is recommended only for experienced programmers.

In 32-bit mode the shl_unload routine unloads a shared library irrespective of whether other shared libraries depend on it. In 64-bit mode shl_unload unloads a shared library only if no other shared library depend on it.

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Kenwood HP 9000 manual Usage
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HP 9000 specifications

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