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ldap_destroy.3
.lf 1 stdin .TH LDAP_OPEN 3 "2018/03/22" "OpenLDAP 2.4.46" .\" $OpenLDAP$ .\" Copyright 1998-2018 The OpenLDAP Foundation All Rights Reserved. .\" Copying restrictions apply. See COPYRIGHT/LICENSE. .SH NAME ldap_dup, ldap_destroy, \- Duplicate and destroy LDAP session handles .SH LIBRARY OpenLDAP LDAP (libldap, \-lldap) .SH SYNOPSIS .nf .ft B #include <ldap.h> .LP .ft B LDAP *ldap_dup( .RS .ft B LDAP *\fIold\fB ); .RE .LP .ft B int ldap_destroy( .RS .ft B LDAP *\fIold\fB ); .RE .SH DESCRIPTION .LP .B ldap_dup() duplicates an existing LDAP .RB ( "LDAP *" ) session handle. The new session handle may be used concurrently with the original session handle. In a threaded environment, different threads may execute concurrent requests on the same connection/session without fear of contamination. Each session handle manages its own private error results. .LP .B ldap_destroy() destroys an existing session handle. .LP The .B ldap_dup() and .B ldap_destroy() functions are used in conjunction with a "thread safe" version of .B libldap .RB ( 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. .LP When a session is created through the use of one of the session creation functions including .BR ldap_open (3), .BR ldap_init (3), .BR ldap_initialize (3) or .BR ldap_init_fd (3) an .B "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 performing different operations using the same session handle will result in inconsistent error codes and return values. .LP To prevent this confusion, .B ldap_dup() is used duplicate an existing session handle so that multiple threads can share the session, and maintain consistent error information and results. .LP The message queues for a session are shared between sibling session handles. Results of operations on a sibling session handles are accessible to all the sibling session handles. Applications desiring results associated with a specific operation should provide the appropriate msgid to .BR ldap_result() . Applications should avoid calling .B ldap_result() with .B 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. .LP When .B ldap_unbind() is called on a session handle with siblings, all the siblings become invalid. .LP Siblings must be destroyed using .BR ldap_destroy() . Session handle resources associated with the original .RB ( "LDAP *" ) will be freed when the last session handle is destroyed or when .B ldap_unbind() is called, if no other session handles currently exist. .SH ERRORS If an error occurs, .B ldap_dup() will return NULL and .I errno should be set appropriately. .B ldap_destroy() will directly return the LDAP code associated to the error (or .I LDAP_SUCCESS in case of success); .I errno should be set as well whenever appropriate. .SH SEE ALSO .BR ldap_open (3), .BR ldap_init (3), .BR ldap_initialize (3), .BR ldap_init_fd (3), .BR errno (3) .SH ACKNOWLEDGEMENTS This work is based on the previously proposed .B LDAP C API Concurrency Extensions draft .BR ( draft-zeilenga-ldap-c-api-concurrency-00.txt ) effort. .lf 1 ./../Project .\" Shared Project Acknowledgement Text .B "OpenLDAP Software" is developed and maintained by The OpenLDAP Project <http://www.openldap.org/>. .B "OpenLDAP Software" is derived from the University of Michigan LDAP 3.3 Release. .lf 127 stdin
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