AC_SOCKET_INVALID nitpick: ((unsigned)~0) [needs 2's compl.] -> ((unsigned)-1)

be sent to transmit client credentials. Buffer the message data.

(with notable exceptions: ignore tests for EINTR which winsock never sets)

This does not happen normally.

internal atexit handler.

Clean up headers.

Calls to gai_strerror() should be replaced with calls AC_GAI_STRERROR().

s/LDAP_PF_UNIX/LDAP_PF_LOCAL/
s/AF_UNIX/AF_LOCAL/
s/PF_UNIX/PF_LOCAL/

macros into our namespace and limit use to headers.  A subsequent
round will add macros to separately handle forward declarations
of variables from declaration of function prototypes.  The last
round will add additional macros for declaring actual variables and
functions.

ber_pvt_wsa_err2string.

support for DCE slash-delimited, left-to-right DNs;
support for a domain socket transport (enable with
--enable-ldapi); and extensions to URL parsing to
support the latter transport.