ldap_result - Wait for the result of an LDAP operation
int ldap_result(ld, msgid, all, timeout, result)
int msgid, all;
struct timeval *timeout;
The ldap_result() routine is used to wait for and return the result of an operation previ-
ously initiated by one of the LDAP asynchronous operation routines (e.g., ldap_search(3),
ldap_modify(3), etc.). Those routines all return -1 in case of error, and an invocation
identifier upon successful initiation of the operation. The invocation identifier is
picked by the library and is guaranteed to be unique across the LDAP session. It can be
used to request the result of a specific operation from ldap_result() through the msgid
The ldap_result() routine will block or not, depending upon the setting of the timeout
parameter. If timeout is not a NULL pointer, it specifies a maximum interval to wait
for the selection to complete. If timeout is a NULL pointer, the select blocks
indefinitely. To effect a poll, the timeout argument should be a non-NULL pointer,
pointing to a zero-valued timeval structure. See select(2) for further details.
If the result of a specific operation is required, msgid should be set to the invocation
identifier returned when the operation was initiated, otherwise LDAP_RES_ANY should be
supplied. The all parameter only has meaning for search responses and is used to select
whether a single entry of the search response should be returned, or all results of the
search should be returned.
A search response is made up of zero or more search entries followed by a search result.
If all is set to 0, search entries will be returned one at a time as they come in, via
separate calls to ldap_result(). If it's set to 1, the search response will only be
returned in its entirety, i.e., after all entries and the final search result have been
Upon success, the type of the result received is returned and the result parameter will
contain the result of the operation. This result should be passed to the LDAP parsing
routines, ldap_first_entry(3) and friends, for interpretation.
The possible result types returned are:
#define LDAP_RES_BIND 0x61L
#define LDAP_RES_SEARCH_ENTRY 0x64L
#define LDAP_RES_SEARCH_RESULT 0x65L
#define LDAP_RES_MODIFY 0x67L
#define LDAP_RES_ADD 0x69L
#define LDAP_RES_DELETE 0x6bL
#define LDAP_RES_MODRDN 0x6dL
#define LDAP_RES_COMPARE 0x6fL
The ldap_msgfree() routine is used to free the memory allocated for a result by
ldap_result() or ldap_search_s(3) and friends. It takes a pointer to the result to be
freed and returns the type of the message it freed.
The ldap_msgtype() routine returns the type of a message.
The ldap_msgid() routine returns the message id of a message.
ldap_result() returns -1 if something bad happens, and zero if the timeout specified was
exceeded. ldap_msgtype() and ldap_msgid() return -1 on error.
This routine dynamically allocates memory for results that it receives. The memory can be
freed by the caller using ldap_msgfree.
ldap(3), ldap_search(3), select(2)
OpenLDAP is developed and maintained by The OpenLDAP Project (http://www.openldap.org/).
OpenLDAP is derived from University of Michigan LDAP 3.3 Release.
OpenLDAP 2.0.27-Release 22 September 1998 LDAP_RESULT(3)