LDAP_OPT_DEBUG

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Use the LDAP_OPT_DEBUG setting to specify a bitmap that indicates the level of debug trace for the LDAP library.

Supported values: 
  /* Debug levels */

   LDAP_DEBUG_OFF         0x000
   LDAP_DEBUG_TRACE       0x001
   LDAP_DEBUG_PACKETS     0x002
   LDAP_DEBUG_ARGS        0x004
   LDAP_DEBUG_CONNS       0x008
   LDAP_DEBUG_BER         0x010
   LDAP_DEBUG_FILTER      0x020
   LDAP_DEBUG_CONFIG      0x040
   LDAP_DEBUG_ACL         0x080
   LDAP_DEBUG_STATS       0x100
   LDAP_DEBUG_STATS2      0x200
   LDAP_DEBUG_SHELL       0x400
   LDAP_DEBUG_PARSE       0x800
   LDAP_DEBUG_ANY         0xffff
For example: 
  int value;
   int debugvalue= LDAP_DEBUG_TRACE | LDAP_DEBUG_PACKETS;
   ldap_set_option( ld, LDAP_OPT_DEBUG, &debugvalue);
   ldap_get_option( ld, LDAP_OPT_DEBUG, &value );