acinclude.m4

dnl CURL_CHECK_HEADER_WINDOWS
dnl -------------------------------------------------
dnl Check for compilable and valid windows.h header 

AC_DEFUN([CURL_CHECK_HEADER_WINDOWS], [
  AC_CACHE_CHECK([for windows.h], [ac_cv_header_windows_h], [
    AC_COMPILE_IFELSE([
      AC_LANG_PROGRAM([
#undef inline
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
      ],[
        int dummy=2*WINVER;
      ])
    ],[
      ac_cv_header_windows_h="yes"
    ],[
      ac_cv_header_windows_h="no"
    ])
  ])
  if test "x$ac_cv_header_windows_h" = "xyes"; then
    AC_DEFINE_UNQUOTED(HAVE_WINDOWS_H, 1,
      [Define to 1 if you have the windows.h header file.])
    AC_DEFINE_UNQUOTED(WIN32_LEAN_AND_MEAN, 1,
      [Define to avoid automatic inclusion of winsock.h])
  fi
])


dnl CURL_CHECK_HEADER_WINSOCK
dnl -------------------------------------------------
dnl Check for compilable and valid winsock.h header 

AC_DEFUN([CURL_CHECK_HEADER_WINSOCK], [
  AC_REQUIRE([CURL_CHECK_HEADER_WINDOWS])dnl
  AC_CACHE_CHECK([for winsock.h], [ac_cv_header_winsock_h], [
    AC_COMPILE_IFELSE([
      AC_LANG_PROGRAM([
#undef inline
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <winsock.h>
      ],[
        int dummy=WSACleanup();
      ])
    ],[
      ac_cv_header_winsock_h="yes"
    ],[
      ac_cv_header_winsock_h="no"
    ])
  ])
  if test "x$ac_cv_header_winsock_h" = "xyes"; then
    AC_DEFINE_UNQUOTED(HAVE_WINSOCK_H, 1,
      [Define to 1 if you have the winsock.h header file.])
  fi
])


dnl CURL_CHECK_HEADER_WINSOCK2
dnl -------------------------------------------------
dnl Check for compilable and valid winsock2.h header 

AC_DEFUN([CURL_CHECK_HEADER_WINSOCK2], [
  AC_REQUIRE([CURL_CHECK_HEADER_WINDOWS])dnl
  AC_CACHE_CHECK([for winsock2.h], [ac_cv_header_winsock2_h], [
    AC_COMPILE_IFELSE([
      AC_LANG_PROGRAM([
#undef inline
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <winsock2.h>
      ],[
        int dummy=2*IPPROTO_ESP;
      ])
    ],[
      ac_cv_header_winsock2_h="yes"
    ],[
      ac_cv_header_winsock2_h="no"
    ])
  ])
  if test "x$ac_cv_header_winsock2_h" = "xyes"; then
    AC_DEFINE_UNQUOTED(HAVE_WINSOCK2_H, 1,
      [Define to 1 if you have the winsock2.h header file.])
  fi
])


dnl CURL_CHECK_HEADER_WS2TCPIP
dnl -------------------------------------------------
dnl Check for compilable and valid ws2tcpip.h header

AC_DEFUN([CURL_CHECK_HEADER_WS2TCPIP], [
  AC_REQUIRE([CURL_CHECK_HEADER_WINSOCK2])dnl
  AC_CACHE_CHECK([for ws2tcpip.h], [ac_cv_header_ws2tcpip_h], [
    AC_COMPILE_IFELSE([
      AC_LANG_PROGRAM([
#undef inline
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <winsock2.h>
#include <ws2tcpip.h>
      ],[
        int dummy=2*IP_PKTINFO;
      ])
    ],[
      ac_cv_header_ws2tcpip_h="yes"
    ],[
      ac_cv_header_ws2tcpip_h="no"
    ])
  ])
  if test "x$ac_cv_header_ws2tcpip_h" = "xyes"; then
    AC_DEFINE_UNQUOTED(HAVE_WS2TCPIP_H, 1,
      [Define to 1 if you have the ws2tcpip.h header file.])
  fi
])


dnl CURL_CHECK_TYPE_SOCKLEN_T
dnl -------------------------------------------------
dnl Check for existing socklen_t type, and provide
dnl an equivalent type if socklen_t not available

AC_DEFUN([CURL_CHECK_TYPE_SOCKLEN_T], [
  AC_REQUIRE([CURL_CHECK_HEADER_WS2TCPIP])dnl
  AC_CHECK_TYPE([socklen_t], ,[
    AC_CACHE_CHECK([for socklen_t equivalent], 
      [curl_cv_socklen_t_equiv], [
      curl_cv_socklen_t_equiv="unknown"
      for arg2 in "struct sockaddr" void; do
        for t in int size_t unsigned long "unsigned long"; do
          AC_COMPILE_IFELSE([
            AC_LANG_PROGRAM([
#undef inline
#ifdef HAVE_WINDOWS_H
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#ifdef HAVE_WINSOCK2_H
#include <winsock2.h>
#else
#ifdef HAVE_WINSOCK_H
#include <winsock.h>
#endif
#endif
#else
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#endif
              int getpeername (int, $arg2 *, $t *);
              int getsockname (int, $arg2 *, $t *);
              int bind   (int, $arg2 *, $t);
              int accept (int, $arg2 *, $t *);
            ],[
              $t len=0;
              getpeername(0,0,&len);
              getsockname(0,0,&len);
              bind(0,0,len);
              accept(0,0,&len);
            ])
          ],[
             curl_cv_socklen_t_equiv="$t"
             break 2
          ])
        done
      done
    ])
    if test "$curl_cv_socklen_t_equiv" = "unknown"; then
      AC_MSG_ERROR([Cannot find a type to use in place of socklen_t])
    else
      AC_DEFINE_UNQUOTED(socklen_t, $curl_cv_socklen_t_equiv,
        [type to use in place of socklen_t if not defined])
    fi
  ],[
#ifdef HAVE_WINDOWS_H
#ifdef HAVE_WS2TCPIP_H
#include <ws2tcpip.h>
#endif
#else
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#endif
  ])
])


dnl Check for how to set a socket to non-blocking state. There seems to exist
dnl four known different ways, with the one used almost everywhere being POSIX
dnl and XPG3, while the other different ways for different systems (old BSD,
dnl Windows and Amiga).
dnl
dnl There are two known platforms (AIX 3.x and SunOS 4.1.x) where the