Added non-blocking sockets test

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

dnl O_NONBLOCK define is found but does not work. This condition is attempted

dnl to get caught in this script by using an excessive number of #ifdefs...

dnl

AC_DEFUN(CURL_CHECK_NONBLOCKING_SOCKET,

[

  AC_MSG_CHECKING([non-blocking sockets style])

  AC_TRY_COMPILE([

/* headers for O_NONBLOCK test */

#include <sys/types.h>

#include <unistd.h>

#include <fcntl.h>

],[

/* try to compile O_NONBLOCK */

#if defined(sun) || defined(__sun__) || defined(__SUNPRO_C) || defined(__SUNPRO_CC)

# if defined(__SVR4) || defined(__srv4__)

#  define PLATFORM_SOLARIS

# else

#  define PLATFORM_SUNOS4

# endif

#endif

#if (defined(_AIX) || defined(__xlC__)) && !defined(_AIX4)

# define PLATFORM_AIX_V3

#endif

#if defined(PLATFORM_SUNOS4) || defined(PLATFORM_AIX_V3)

#error "O_NONBLOCK does not work on this platform"

#endif

  int socket;

  int flags = fcntl(socket, F_SETFL, flags | O_NONBLOCK);

],[

dnl the O_NONBLOCK test was fine

nonblock="O_NONBLOCK"

AC_DEFINE(HAVE_O_NONBLOCK)

],[

dnl the code was bad, try a different program now, test 2

  AC_TRY_COMPILE([

/* headers for FIONBIO test */

#include <unistd.h>

#include <stropts.h>

],[

/* FIONBIO source test */

 int flags = ioctl(socket, FIONBIO, &flags);

],[

dnl FIONBIO test was good

nonblock="FIONBIO"

AC_DEFINE(HAVE_FIONBIO)

],[

dnl FIONBIO test was also bad

dnl the code was bad, try a different program now, test 3

  AC_TRY_COMPILE([

/* headers for ioctlsocket test (cygwin?) */

#include <windows.h>

],[

/* ioctlsocket source code */

 int flags = ioctlsocket(socket, FIONBIO, &flags);

],[

dnl ioctlsocket test was good

nonblock="ioctlsocket"

AC_DEFINE(HAVE_IOCTLSOCKET)

],[

dnl ioctlsocket didnt compile!

  AC_TRY_COMPILE([

/* headers for IoctlSocket test (Amiga?) */

#include <sys/ioctl.h>

],[

/* IoctlSocket source code */

 int flags = IoctlSocket(socket, FIONBIO, (long)1);

],[

dnl ioctlsocket test was good

nonblock="IoctlSocket"

AC_DEFINE(HAVE_IOCTLSOCKET_CASE)

],[

dnl ioctlsocket didnt compile!

nonblock="nada"

AC_DEFINE(HAVE_DISABLED_NONBLOCKING)

])

dnl end of forth test

])

dnl end of third test

])

dnl end of second test

])

dnl end of non-blocking try-compile test

  AC_MSG_RESULT($nonblock)

  if test "$nonblock" = "nada"; then

    AC_MSG_WARN([non-block sockets disabled])

  fi

])

dnl Check for socklen_t: historically on BSD it is an int, and in

dnl POSIX 1g it is a type of its own, but some platforms use different

dnl types for the argument to getsockopt, getpeername, etc.  So we

dnl dl lib?

AC_CHECK_FUNC(dlclose, , AC_CHECK_LIB(dl, dlopen))

dnl **********************************************************************

dnl Check how non-blocking sockets are set

dnl **********************************************************************

AC_ARG_ENABLE(nonblocking,

[  --enable-nonblocking  Makes the script detect how to do it

  --disable-nonblocking Makes the script disable non-blocking sockets],

[

  if test "$enableval" = "no" ; then

    AC_MSG_WARN([non-blocking sockets disabled])

    AC_DEFINE(HAVE_DISABLED_NONBLOCKING)

  else

    CURL_CHECK_NONBLOCKING_SOCKET

  fi

],

[

  CURL_CHECK_NONBLOCKING_SOCKET

])

dnl **********************************************************************

dnl Check for the random seed preferences 

dnl **********************************************************************