dlclose(3c) [sunos man page]

dlclose(3C)						   Standard C Library Functions 					       dlclose(3C)

NAME

       dlclose - close a shared object

SYNOPSIS

       #include <dlfcn.h>

       int dlclose(void *handle);

DESCRIPTION

       The  dlclose()  function  decrements  the  reference count of the supplied handle. This handle represents an executable object file and its
       dependencies, acquired from a previous call to dlopen(). A handle that is no longer referenced is processed in an  attempt  to  unload  any
       objects that are associated with the handle from the current process. An unreferenced handle is no longer available to dlsym().

       Any  finalization  code	within	an  object  is	executed  prior  to that object being unloaded. Any routines registered by an object using
       atexit(3C) are called prior to that object being unloaded. See NOTES.

RETURN VALUES

       If the handle was successfully unreferenced, dlclose() returns 0. If the handle is invalid, or an error occurred as a result  of  unloading
       an object, dlclose() returns a non-zero value. Additional diagnostic information is available through dlerror().

USAGE

       The dlclose() function is one of a family of functions that give the user direct access to the dynamic linking facilities. These facilities
       are available to dynamically-linked processes only. See the Linker and Libraries Guide.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       ld(1), ld.so.1(1), atexit(3C), dladdr(3C), dldump(3C), dlerror(3C), dlopen(3C), dlsym(3C), attributes(5), standards(5)

       Linker and Libraries Guide

NOTES

       A successful invocation of  dlclose() does not guarantee that the objects associated with the handle are removed from the address space	of
       the  current  process.  Objects can be referenced by multiple handles, or by other objects. An object is not removed from the address space
       of the current process until all references to that object are removed.

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

       As part of unloading an object, finalization code within the object is called before the dlclose() returns. This finalization is user code,
       and  as such, can produce errors that can not be caught by dlclose(). For example, an object loaded using RTLD_LAZY that attempts to call a
       function that can not be located, results in process termination. Erroneous programming practices within the  finalization  code  can  also
       result  in  process  termination.  The runtime linkers debugging facility can offer help identifying these types of error. See the LD_DEBUG
       environment variable of ld.so.1(1).

SunOS 5.10							   1 March 2004 						       dlclose(3C)

Check Out this Related Man Page

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(3c) [sunos man page]

Check Out this Related Man Page