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RedHat 9 (Linux i386) - man page for ldap_open (redhat section 3)

LDAP_OPEN(3)									     LDAP_OPEN(3)

NAME
       ldap_init, ldap_open - Initialize the LDAP library and open a connection to an LDAP server

SYNOPSIS
       #include <ldap.h>

       LDAP *ldap_open(host, port)
       char *host;
       int port;

       LDAP *ldap_init(host, port)
       char *host;
       int port;

DESCRIPTION
       ldap_open()  opens a connection to an LDAP server and allocates an LDAP structure which is
       used to identify the connection and to maintain per-connection  information.   ldap_init()
       allocates  an  LDAP  structure  but does not open an initial connection.  One of these two
       routines must be called before any operations are attempted.

       ldap_open() takes host, the hostname on which the LDAP server is running,  and  port,  the
       port  number  to  which	to connect.  If the default IANA-assigned port of 389 is desired,
       LDAP_PORT should be specified for port.	The host parameter may contain a  blank-separated
       list of hosts to try to connect to, and each host may optionally by of the form host:port.
       If present, the :port overrides the port parameter to ldap_open().  Upon successfully mak-
       ing  a  connection  to  an LDAP server, ldap_open() returns a pointer to an LDAP structure
       (defined below), which should be passed to subsequent calls to ldap_bind(), ldap_search(),
       etc.  Certain  fields in the LDAP structure can be set to indicate size limit, time limit,
       and how aliases are handled during operations.  See <ldap.h> for more details.

	    typedef struct ldap {
		 /* ... other stuff you should not mess with ... */
		 char	   ld_lberoptions;
		 int	   ld_deref;
	    #define LDAP_DEREF_NEVER 0
	    #define LDAP_DEREF_SEARCHING  1
	    #define LDAP_DEREF_FINDING	  2
	    #define LDAP_DEREF_ALWAYS	  3
		 int	   ld_timelimit;
		 int	   ld_sizelimit;
	    #define LDAP_NO_LIMIT	  0
		 int	   ld_errno;
		 char	   *ld_error;
		 char	   *ld_matched;
		 int	   ld_refhoplimit;
		 unsigned long	ld_options;
	    #define LDAP_OPT_REFERRALS	    0x00000002	 /* set by default */
	    #define LDAP_OPT_RESTART 0x00000004
		 /* ... other stuff you should not mess with ... */
	    } LDAP;

       ldap_init() acts just like ldap_open(), but does not open a connection to the LDAP server.
       The  actual  connection	open  will  occur when the first operation is attempted.  At this
       time, ldap_init() is preferred.	ldap_open() will be depreciated in a later release.

ERRORS
       If an error occurs, these routines will return NULL and errno should be set appropriately.

OPTIONS
       Options that affect a particular LDAP instance may be  set  by  modifying  the  ld_options
       field  in  the LDAP structure.  This field is set to LDAP_OPT_REFERRALS in ldap_open() and
       ldap_init(), which causes the library to automatically follow referrals to  other  servers
       that may be returned in response to an LDAP operation.

       The  other  supported option is LDAP_OPT_RESTART, which if set will cause the LDAP library
       to restart the select(2) system call when it is interrupted by the system (i.e., errno  is
       set to EINTR).  This option is not supported on the Macintosh and under MS-DOS.

       An option can be turned off by clearing the appropriate bit in the ld_options field.

NOTES
       There  are other elements in the LDAP structure that you should not change. You should not
       make any assumptions about the order of elements in the LDAP structure.

SEE ALSO
       ldap(3), ldap_bind(3), errno(3)

ACKNOWLEDGEMENTS
       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_OPEN(3)


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