Shared Library Management Routines

The dlopen Shared Library Management Routines

Parameters

Parm

Definition

 

 

handle

Value returned by a previous invocation of dlopen.

 

 

Return Values

If the referenced shared library was successfully closed, dlclose returns 0. If the shared library could not be closed, or if handle does not refer to an open shared library, dlclose returns a non-0 value. More detailed diagnostic information is available through dlerror.

Description

dlclose disassociates a shared library previously opened by dlopen from the current process. Once an shared library has been closed using dlclose, dlsym no longer has access to its symbols. All shared libraries loaded automatically as a result of invoking dlopen on the referenced shared library [see dlopen(3C)] are also closed.

A successful invocation of dlclose does not guarantee that the shared libraries associated with handle have actually been removed from the address space of the process. shared libraries loaded by one invocation of dlopen may also be loaded by another invocation of dlopen. The same shared library may also be opened multiple times. An shared library is not removed from the address space until all references to that shared library through an explicit dlopen invocation have been closed and all other shared libraries implicitly referencing that shared library have also been closed. Once an shared library has been closed by dlclose, referencing symbols contained in that shared library can cause undefined behavior.

Example

The following example shows how to use dlclose to unload a shared library:

void* handle;

int ret_value;

handle = dlopen(“./lib1.sl”, RTLD_GLOBAL RTLD_LAZY);

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HP 9000 specifications

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