LDAP_OPEN(3) Library Functions Manual LDAP_OPEN(3) NAME ldap_dup, ldap_destroy, - Duplicate and destroy LDAP session handles LIBRARY OpenLDAP LDAP (libldap, -lldap) SYNOPSIS #include <ldap.h> LDAP *ldap_dup( LDAP *old ); int ldap_destroy( LDAP *old ); DESCRIPTION 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 last session handle is destroyed or when ldap_unbind() is called, if no other session handles currently exist. ERRORS If an error occurs, ldap_dup() will return NULL and errno should be set appropriately. ldap_destroy() will directly return the LDAP code asso- ciated to the error (or LDAP_SUCCESS in case of success); errno should be set as well whenever appropriate. SEE ALSO ldap_open(3), ldap_init(3), ldap_initialize(3), ldap_init_fd(3), errno(3) ACKNOWLEDGEMENTS 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 <http://www.openldap.org/>. OpenLDAP Software is derived from Univer- sity of Michigan LDAP 3.3 Release. OpenLDAP 2014/09/20 LDAP_OPEN(3)
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