dlclose(3) [osf1 man page]

dlclose(3)						     Library Functions Manual							dlclose(3)

NAME

       dlclose - Close a dlopen() object

SYNOPSIS

       #include <dlfcn.h>

       int dlclose(void *handle)

PARAMETERS

       A pointer to a global symbol object that is returned from a call to dlopen().

DESCRIPTION

       The dlclose function is used to inform the system that the object referenced by a handle returned from a previous dlopen() invocation is no
       longer needed by the application.

       The use of dlclose() reflects a statement of intent on the part of the process, but does not create any requirements on the dynamic library
       loader,	such as removal of the code or symbols referenced by handle. Once an object has been closed using dlclose(), an application should
       assume that its symbols are no longer available to dlsym(). All objects loaded automatically as a result of invoking dlopen() on the refer-
       enced object are also closed.

       The dlclose function deallocates the address space for the library corresponding to handle.  The results are undefined if any user function
       continues to call a symbol resolved in the address space of a library that has since been deallocated by dlclose.

       The dlclose operation will not remove an object to which references have been relocated, until or unless all such references  are  removed.
       For  instance,  an object that had been loaded with a dlopen() operation specifying the RTLD_GLOBAL flag might provide a target for dynamic
       relocations performed in the processing of other objects - in such environments, an application may assume that no relocation,  once  made,
       will be undone or remade unless the object requiring the relocation has itself been removed.

RETURN VALUE

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

ERRORS

       No errors are defined.

NOTES

       The dlopen and dlclose routines might dynamically change the resolution of certain symbols referenced by a program or  its  shared  library
       dependencies.  The dlopen routine might resolve symbols that were previously unresolved, and dlclose might cause resolved symbols to become
       unresolved or to be reresolved to a different symbol definition.

       A portable application will employ a handle returned from a dlopen() invocation only within a given scope bracketed  by	the  dlopen()  and
       dlclose()  operations.	The  dynamic  library  loader  is  free  to use reference counting or other techniques such that multiple calls to
       dlopen() referencing the same object may return the same object for handle. The dynamic library loader is also free to re-use a handle. For
       these reasons, the value of a handle must be treated as an opaque object by the application, used only in calls to dlsym() and dlclose().

RELATED INFORMATION

       dlerror(3), dlopen(3), dlsym(3).  delim off

																	dlclose(3)

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dlclose(3C)															       dlclose(3C)

NAME

       dlclose() - close a shared library

SYNOPSIS

       [flag ... ] file ...  [library]...

   Multithread Usage
       This routine is thread-safe.

       NOTE:  The  dynamic loader serializes the loading and unloading of shared libraries in multithreaded applications using a recursive pthread
       mutex lock.  See the for more information.

DESCRIPTION

       is one of a family of routines that give the user direct access to the dynamic linking facilities (using the option on the compiler or com-
       mand  line).  disassociates a shared object previously opened by from the current process. Once an object has been closed using its symbols
       are no longer available to All objects loaded automatically as a result of invoking on the referenced  object  (see  dlopen(3C))  are  also
       closed.	handle is the value returned by a previous invocation of

RETURN VALUE

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

ERRORS

       If fails, a subsequent call to returns one of the following values.
	      Cannot apply relocation in library.

	      Cannot close library due to remaining dependencies.

	      Invalid handle.

	      Out of memory.

	      failed on entry to or exit from

	      failed on exit from

	      failed on entry to

	      Unknown handle.

WARNINGS

       A successful invocation of does not guarantee that the objects associated with handle have actually been removed from the address space	of
       the  process.   Objects loaded by one invocation of may also be loaded by another invocation of The same object may also be opened multiple
       times.  An object is not removed from the address space until all references to that object through an explicit invocation have been closed
       and all other objects implicitly referencing that object have also been closed.

       Once an object has been closed by referencing symbols contained in that object can cause undefined behavior.

SEE ALSO

       dlerrno(3C), dlerror(3C), dlopen(3C), dlsym(3C).

   Texts and Tutorials
       (See the 	 option)
       (See		 manuals(5) for ordering information)

																       dlclose(3C)

Linux and UNIX Man Pages

dlclose(3) [osf1 man page]

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