pgsql/include/server/port/win32/sys/socket.h

/*
 * src/include/port/win32/sys/socket.h
 */
#ifndef WIN32_SYS_SOCKET_H
#define WIN32_SYS_SOCKET_H

/*
 * Unfortunately, <wingdi.h> of VC++ also defines ERROR.
 * To avoid the conflict, we include <windows.h> here and undefine ERROR
 * immediately.
 *
 * Note: Don't include <wingdi.h> directly.  It causes compile errors.
 */
#include <winsock2.h>
#include <ws2tcpip.h>
#include <windows.h>

#undef ERROR
#undef small

/* Restore old ERROR value */
#ifdef PGERROR
#define ERROR PGERROR
#endif

/*
 * We don't use the Windows gai_strerror[A] function because it is not
 * thread-safe.  We define our own in src/port/win32gai_strerror.c.
 */
#undef gai_strerror

extern const char *gai_strerror(int ecode);

#endif							/* WIN32_SYS_SOCKET_H */