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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | ERRORS | SEE ALSO | ACKNOWLEDGEMENTS | COLOPHON |
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LDAP_OPEN(3) Library Functions Manual LDAP_OPEN(3)
ldap_dup, ldap_destroy, - Duplicate and destroy LDAP session handles
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
concurrent requests on the same connection/session without fear of
contamination. 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
creation functions including ldap_open(3), ldap_init(3),
ldap_initialize(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 performing 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
accessible to all the sibling session handles. Applications desiring
results associated with a specific operation should provide the
appropriate 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.
If an error occurs, ldap_dup() will return NULL and errno should be
set appropriately. ldap_destroy() will directly return the LDAP code
associated to the error (or LDAP_SUCCESS in case of success); errno
should be set as well whenever appropriate.
ldap_open(3), ldap_init(3), ldap_initialize(3), ldap_init_fd(3),
errno(3)
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 the University of Michigan LDAP 3.3 Release.
This page is part of the OpenLDAP (an open source implementation of
the Lightweight Directory Access Protocol) project. Information
about the project can be found at ⟨http://www.openldap.org/⟩. If you
have a bug report for this manual page, see
⟨http://www.openldap.org/its/⟩. This page was obtained from the
project's upstream Git repository
⟨git://git.openldap.org/openldap.git⟩ on 2018-02-02. (At that time,
the date of the most recent commit that was found in the repository
was 2018-01-30.) If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-to-
date source for the page, or you have corrections or improvements to
the information in this COLOPHON (which is not part of the original
manual page), send a mail to man-pages@man7.org
OpenLDAP LDVERSION RELEASEDATE LDAP_OPEN(3)
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