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           OpenLDAP LDAP (libldap, -lldap)


           #include <ldap.h>
           LDAP *ldap_dup(
                  LDAP *old );
           int ldap_destroy(
                  LDAP *old );


           ldap_dup()  duplicates  an  existing LDAP (LDAP *) session handle.  The
           new session handle may be used concurrently with the  original  session
           handle.   In a threaded environment, different threads may execute con-
           current requests on the same connection/session without fear of contam-
           ination.  Each session handle manages its own private error results.
           ldap_destroy() destroys an existing session handle.
           The  ldap_dup()  and  ldap_destroy()  functions are used in conjunction
           with a "thread safe" version of libldap (libldap_r) to enable operation
           thread  safe  API calls, so that a single session may be simultaneously
           used across multiple threads with consistent error handling.
           When a session is created through the use of one of  the  session  cre-
           ation  functions  including  ldap_open(3),  ldap_init(3), ldap_initial-
           ize(3) or ldap_init_fd(3) an LDAP * session handle is returned  to  the
           application.  The session handle may be shared amongst threads, however
           the error codes are unique to a session handle.  Multiple threads  per-
           forming  different operations using the same session handle will result
           in inconsistent error codes and return values.
           To prevent this confusion, ldap_dup() is  used  duplicate  an  existing
           session  handle  so  that  multiple  threads can share the session, and
           maintain consistent error information and results.
           The message queues for a session are  shared  between  sibling  session
           handles.  Results of operations on a sibling session handles are acces-
           sible to  all  the  sibling  session  handles.   Applications  desiring
           results  associated with a specific operation should provide the appro-
           priate msgid  to  ldap_result().   Applications  should  avoid  calling
           ldap_result()  with LDAP_RES_ANY as that may "steal" and return results
           in the calling thread that another operation  in  a  different  thread,
           using a different session handle, may require to complete.
           When ldap_unbind() is called on a session handle with siblings, all the
           siblings become invalid.
           Siblings  must  be  destroyed  using  ldap_destroy().   Session  handle
           resources  associated with the original (LDAP *) will be freed when the
           This  work  is  based on the previously proposed LDAP C API Concurrency
           Extensions draft (draft-zeilenga-ldap-c-api-concurrency-00.txt) effort.
           OpenLDAP  Software  is developed and maintained by The OpenLDAP Project
           <>.  OpenLDAP Software is derived from  Univer-
           sity of Michigan LDAP 3.3 Release.

    OpenLDAP 2.4.40 2014/09/20 LDAP_OPEN(3)


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