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diff --git a/include/ac/socket.h b/include/ac/socket.h
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+/* Generic socket.h */
+/* $OpenLDAP$ */
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright 1998-2021 The OpenLDAP Foundation.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted only as authorized by the OpenLDAP
+ * Public License.
+ *
+ * A copy of this license is available in file LICENSE in the
+ * top-level directory of the distribution or, alternatively, at
+ * <http://www.OpenLDAP.org/license.html>.
+ */
+
+#ifndef _AC_SOCKET_H_
+#define _AC_SOCKET_H_
+
+#ifdef HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+
+#ifdef HAVE_POLL_H
+#include <poll.h>
+#elif defined(HAVE_SYS_POLL_H)
+#include <sys/poll.h>
+#endif
+
+#ifdef HAVE_SYS_SOCKET_H
+#include <sys/socket.h>
+
+#ifdef HAVE_SYS_UN_H
+#include <sys/un.h>
+#endif
+
+#ifdef HAVE_SYS_SELECT_H
+#include <sys/select.h>
+#endif
+
+#include <netinet/in.h>
+
+#ifdef HAVE_NETINET_TCP_H
+#include <netinet/tcp.h>
+#endif
+
+#ifdef HAVE_ARPA_INET_H
+#include <arpa/inet.h>
+#endif
+
+#ifdef HAVE_ARPA_NAMESER_H
+#include <arpa/nameser.h>
+#endif
+
+#include <netdb.h>
+
+#ifdef HAVE_RESOLV_H
+#include <resolv.h>
+#endif
+
+#endif /* HAVE_SYS_SOCKET_H */
+
+#ifdef HAVE_WINSOCK2
+#include <winsock2.h>
+#include <ws2tcpip.h>
+#elif HAVE_WINSOCK
+#include <winsock.h>
+#endif
+
+#ifdef HAVE_PCNFS
+#include <tklib.h>
+#endif /* HAVE_PCNFS */
+
+#ifndef INADDR_LOOPBACK
+#define INADDR_LOOPBACK (0x7f000001UL)
+#endif
+
+#ifndef MAXHOSTNAMELEN
+#define MAXHOSTNAMELEN 64
+#endif
+
+#undef sock_errno
+#undef sock_errstr
+#define sock_errno() errno
+#define sock_errstr(e) STRERROR(e)
+#define sock_errset(e) ((void) (errno = (e)))
+
+#ifdef HAVE_WINSOCK
+# define tcp_read( s, buf, len ) recv( s, buf, len, 0 )
+# define tcp_write( s, buf, len ) send( s, buf, len, 0 )
+# define ioctl( s, c, a ) ioctlsocket( (s), (c), (a) )
+# define ioctl_t u_long
+# define AC_SOCKET_INVALID ((unsigned int) -1)
+
+# ifdef SD_BOTH
+# define tcp_close( s ) (shutdown( s, SD_BOTH ), closesocket( s ))
+# else
+# define tcp_close( s ) closesocket( s )
+# endif
+
+#define EWOULDBLOCK WSAEWOULDBLOCK
+#define EINPROGRESS WSAEINPROGRESS
+#define ETIMEDOUT WSAETIMEDOUT
+
+#undef sock_errno
+#undef sock_errstr
+#undef sock_errset
+#define sock_errno() WSAGetLastError()
+#define sock_errstr(e) ber_pvt_wsa_err2string(e)
+#define sock_errset(e) WSASetLastError(e)
+
+LBER_F( char * ) ber_pvt_wsa_err2string LDAP_P((int));
+
+#elif MACOS
+# define tcp_close( s ) tcpclose( s )
+# define tcp_read( s, buf, len ) tcpread( s, buf, len )
+# define tcp_write( s, buf, len ) tcpwrite( s, buf, len )
+
+#elif DOS
+# ifdef PCNFS
+# define tcp_close( s ) close( s )
+# define tcp_read( s, buf, len ) recv( s, buf, len, 0 )
+# define tcp_write( s, buf, len ) send( s, buf, len, 0 )
+# endif /* PCNFS */
+# ifdef NCSA
+# define tcp_close( s ) do { netclose( s ); netshut() } while(0)
+# define tcp_read( s, buf, len ) nread( s, buf, len )
+# define tcp_write( s, buf, len ) netwrite( s, buf, len )
+# endif /* NCSA */
+
+#elif defined(HAVE_CLOSESOCKET)
+# define tcp_close( s ) closesocket( s )
+
+# ifdef __BEOS__
+# define tcp_read( s, buf, len ) recv( s, buf, len, 0 )
+# define tcp_write( s, buf, len ) send( s, buf, len, 0 )
+# endif
+
+#else
+# define tcp_read( s, buf, len) read( s, buf, len )
+# define tcp_write( s, buf, len) write( s, buf, len )
+
+# ifdef SHUT_RDWR
+# define tcp_close( s ) (shutdown( s, SHUT_RDWR ), close( s ))
+# else
+# define tcp_close( s ) close( s )
+# endif
+
+#ifdef HAVE_PIPE
+/*
+ * Only use pipe() on systems where file and socket descriptors
+ * are interchangable
+ */
+# define USE_PIPE HAVE_PIPE
+#endif
+
+#endif /* MACOS */
+
+#ifndef ioctl_t
+# define ioctl_t int
+#endif
+
+#ifndef AC_SOCKET_INVALID
+# define AC_SOCKET_INVALID (-1)
+#endif
+#ifndef AC_SOCKET_ERROR
+# define AC_SOCKET_ERROR (-1)
+#endif
+
+#if !defined( HAVE_INET_ATON ) && !defined( inet_aton )
+# define inet_aton ldap_pvt_inet_aton
+struct in_addr;
+LDAP_F (int) ldap_pvt_inet_aton LDAP_P(( const char *, struct in_addr * ));
+#endif
+
+#if defined(__WIN32) && defined(_ALPHA)
+/* NT on Alpha is hosed. */
+# define AC_HTONL( l ) \
+ ((((l)&0xffU)<<24) + (((l)&0xff00U)<<8) + \
+ (((l)&0xff0000U)>>8) + (((l)&0xff000000U)>>24))
+# define AC_NTOHL(l) AC_HTONL(l)
+
+#else
+# define AC_HTONL( l ) htonl( l )
+# define AC_NTOHL( l ) ntohl( l )
+#endif
+
+/* htons()/ntohs() may be broken much like htonl()/ntohl() */
+#define AC_HTONS( s ) htons( s )
+#define AC_NTOHS( s ) ntohs( s )
+
+#ifdef LDAP_PF_LOCAL
+# if !defined( AF_LOCAL ) && defined( AF_UNIX )
+# define AF_LOCAL AF_UNIX
+# endif
+# if !defined( PF_LOCAL ) && defined( PF_UNIX )
+# define PF_LOCAL PF_UNIX
+# endif
+#endif
+
+#ifndef INET_ADDRSTRLEN
+# define INET_ADDRSTRLEN 16
+#endif
+#ifndef INET6_ADDRSTRLEN
+# define INET6_ADDRSTRLEN 46
+#endif
+
+#if defined( HAVE_GETADDRINFO ) || defined( HAVE_GETNAMEINFO )
+# ifdef HAVE_GAI_STRERROR
+# define AC_GAI_STRERROR(x) (gai_strerror((x)))
+# else
+# define AC_GAI_STRERROR(x) (ldap_pvt_gai_strerror((x)))
+ LDAP_F (char *) ldap_pvt_gai_strerror( int );
+# endif
+#endif
+
+#if defined(LDAP_PF_LOCAL) && \
+ !defined(HAVE_GETPEEREID) && \
+ !defined(HAVE_GETPEERUCRED) && \
+ !defined(SO_PEERCRED) && !defined(LOCAL_PEERCRED) && \
+ defined(HAVE_SENDMSG) && (defined(HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTSLEN) || \
+ defined(HAVE_STRUCT_MSGHDR_MSG_CONTROL))
+# define LDAP_PF_LOCAL_SENDMSG 1
+#endif
+
+#ifdef HAVE_GETPEEREID
+#define LUTIL_GETPEEREID( s, uid, gid, bv ) getpeereid( s, uid, gid )
+#elif defined(LDAP_PF_LOCAL_SENDMSG)
+struct berval;
+LDAP_LUTIL_F( int ) lutil_getpeereid( int s, uid_t *, gid_t *, struct berval *bv );
+#define LUTIL_GETPEEREID( s, uid, gid, bv ) lutil_getpeereid( s, uid, gid, bv )
+#else
+LDAP_LUTIL_F( int ) lutil_getpeereid( int s, uid_t *, gid_t * );
+#define LUTIL_GETPEEREID( s, uid, gid, bv ) lutil_getpeereid( s, uid, gid )
+#endif
+
+/* DNS RFC defines max host name as 255. New systems seem to use 1024 */
+#ifndef NI_MAXHOST
+#define NI_MAXHOST 256
+#endif
+
+#ifdef HAVE_POLL
+# ifndef INFTIM
+# define INFTIM (-1)
+# endif
+#undef POLL_OTHER
+#define POLL_OTHER (POLLERR|POLLHUP)
+#undef POLL_READ
+#define POLL_READ (POLLIN|POLLPRI|POLL_OTHER)
+#undef POLL_WRITE
+#define POLL_WRITE (POLLOUT|POLL_OTHER)
+#endif
+
+#endif /* _AC_SOCKET_H_ */