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 have to test to find something that will work.
AC_DEFUN([TYPE_SOCKLEN_T],
[
   AC_CHECK_TYPE([socklen_t], ,[
      AC_MSG_CHECKING([for socklen_t equivalent])
      AC_CACHE_VAL([curl_cv_socklen_t_equiv],
      [
         # Systems have either "struct sockaddr *" or
         # "void *" as the second argument to getpeername
         curl_cv_socklen_t_equiv=
         for arg2 in "struct sockaddr" void; do
            for t in int size_t unsigned long "unsigned long"; do
               AC_TRY_COMPILE([
                  #include <sys/types.h>
                  #include <sys/socket.h>

                  int getpeername (int, $arg2 *, $t *);
               ],[
                  $t len;
                  getpeername(0,0,&len);
               ],[
                  curl_cv_socklen_t_equiv="$t"
                  break
               ])
            done
         done

         if test "x$curl_cv_socklen_t_equiv" = x; then
            AC_MSG_ERROR([Cannot find a type to use in place of socklen_t])
         fi
      ])
      AC_MSG_RESULT($curl_cv_socklen_t_equiv)
      AC_DEFINE_UNQUOTED(socklen_t, $curl_cv_socklen_t_equiv,
			[type to use in place of socklen_t if not defined])],
      [#include <sys/types.h>
#include <sys/socket.h>])
])

dnl ************************************************************
dnl check for "localhost", if it doesn't exist, we can't do the
dnl gethostbyname_r tests!
dnl 

AC_DEFUN(CURL_CHECK_WORKING_RESOLVER,[
AC_MSG_CHECKING([if "localhost" resolves])
AC_TRY_RUN([
#include <string.h>
#include <sys/types.h>
#include <netdb.h>

int
main () {
struct hostent *h;
h = gethostbyname("localhost");
exit (h == NULL ? 1 : 0); }],[
      AC_MSG_RESULT(yes)],[
      AC_MSG_RESULT(no)
      AC_MSG_ERROR([can't figure out gethostbyname_r() since localhost doesn't resolve])

      ]
)
])

dnl ************************************************************
dnl check for working getaddrinfo()
dnl
AC_DEFUN(CURL_CHECK_WORKING_GETADDRINFO,[
  AC_CACHE_CHECK(for working getaddrinfo, ac_cv_working_getaddrinfo,[
  AC_TRY_RUN( [
#include <netdb.h>
#include <sys/types.h>
#include <sys/socket.h>

void main(void) {
    struct addrinfo hints, *ai;
    int error;

    memset(&hints, 0, sizeof(hints));
    hints.ai_family = AF_UNSPEC;
    hints.ai_socktype = SOCK_STREAM;
    error = getaddrinfo("127.0.0.1", "8080", &hints, &ai);
    if (error) {
        exit(1);
    }
    else {
        exit(0);
    }
}
],[
  ac_cv_working_getaddrinfo="yes"
],[
  ac_cv_working_getaddrinfo="no"
],[
  ac_cv_working_getaddrinfo="yes"
])])
if test "$ac_cv_working_getaddrinfo" = "yes"; then
  AC_DEFINE(HAVE_GETADDRINFO, 1, [Define if getaddrinfo exists and works])
  AC_DEFINE(ENABLE_IPV6, 1, [Define if you want to enable IPv6 support])

  IPV6_ENABLED=1
  AC_SUBST(IPV6_ENABLED)
fi
])


AC_DEFUN(CURL_CHECK_LOCALTIME_R,
[
  dnl check for a few thread-safe functions
  AC_CHECK_FUNCS(localtime_r,[
    AC_MSG_CHECKING(whether localtime_r is declared)
    AC_EGREP_CPP(localtime_r,[
#include <time.h>],[
      AC_MSG_RESULT(yes)],[
      AC_MSG_RESULT(no)
      AC_MSG_CHECKING(whether localtime_r with -D_REENTRANT is declared)
      AC_EGREP_CPP(localtime_r,[
#define _REENTRANT
#include <time.h>],[
	AC_DEFINE(NEED_REENTRANT)
	AC_MSG_RESULT(yes)],
	AC_MSG_RESULT(no))])])
])

AC_DEFUN(CURL_CHECK_INET_NTOA_R,
[
  dnl determine if function definition for inet_ntoa_r exists.
  AC_CHECK_FUNCS(inet_ntoa_r,[
    AC_MSG_CHECKING(whether inet_ntoa_r is declared)
    AC_EGREP_CPP(inet_ntoa_r,[
#include <arpa/inet.h>],[
      AC_DEFINE(HAVE_INET_NTOA_R_DECL)
      AC_MSG_RESULT(yes)],[
      AC_MSG_RESULT(no)
      AC_MSG_CHECKING(whether inet_ntoa_r with -D_REENTRANT is declared)
      AC_EGREP_CPP(inet_ntoa_r,[
#define _REENTRANT
#include <arpa/inet.h>],[
	AC_DEFINE(HAVE_INET_NTOA_R_DECL)
	AC_DEFINE(NEED_REENTRANT)
	AC_MSG_RESULT(yes)],
	AC_MSG_RESULT(no))])])

])

AC_DEFUN(CURL_CHECK_GETHOSTBYADDR_R,
[
  dnl check for number of arguments to gethostbyaddr_r. it might take
  dnl either 5, 7, or 8 arguments.
  AC_CHECK_FUNCS(gethostbyaddr_r,[
    AC_MSG_CHECKING(if gethostbyaddr_r takes 5 arguments)
    AC_TRY_COMPILE([
#include <sys/types.h>
#include <netdb.h>],[
char * address;
int length;
int type;
struct hostent h;
struct hostent_data hdata;
int rc;
rc = gethostbyaddr_r(address, length, type, &h, &hdata);],[
      AC_MSG_RESULT(yes)
      AC_DEFINE(HAVE_GETHOSTBYADDR_R_5)
      ac_cv_gethostbyaddr_args=5],[
      AC_MSG_RESULT(no)
      AC_MSG_CHECKING(if gethostbyaddr_r with -D_REENTRANT takes 5 arguments)
      AC_TRY_COMPILE([
#define _REENTRANT
#include <sys/types.h>
#include <netdb.h>],[
char * address;
int length;
int type;
struct hostent h;
struct hostent_data hdata;
int rc;
rc = gethostbyaddr_r(address, length, type, &h, &hdata);],[
	AC_MSG_RESULT(yes)
	AC_DEFINE(HAVE_GETHOSTBYADDR_R_5)
	AC_DEFINE(NEED_REENTRANT)
	ac_cv_gethostbyaddr_args=5],[
	AC_MSG_RESULT(no)
	AC_MSG_CHECKING(if gethostbyaddr_r takes 7 arguments)
	AC_TRY_COMPILE([
#include <sys/types.h>
#include <netdb.h>],[
char * address;
int length;
int type;
struct hostent h;
char buffer[8192];
int h_errnop;
struct hostent * hp;

hp = gethostbyaddr_r(address, length, type, &h,
                     buffer, 8192, &h_errnop);],[
	  AC_MSG_RESULT(yes)
	  AC_DEFINE(HAVE_GETHOSTBYADDR_R_7)
	  ac_cv_gethostbyaddr_args=7],[
	  AC_MSG_RESULT(no)
	  AC_MSG_CHECKING(if gethostbyaddr_r takes 8 arguments)
	  AC_TRY_COMPILE([
#include <sys/types.h>
#include <netdb.h>],[
char * address;
int length;
int type;
struct hostent h;
char buffer[8192];
int h_errnop;
struct hostent * hp;
int rc;

rc = gethostbyaddr_r(address, length, type, &h,
                     buffer, 8192, &hp, &h_errnop);],[
	    AC_MSG_RESULT(yes)
	    AC_DEFINE(HAVE_GETHOSTBYADDR_R_8)
	    ac_cv_gethostbyaddr_args=8],[
	    AC_MSG_RESULT(no)
	    have_missing_r_funcs="$have_missing_r_funcs gethostbyaddr_r"])])])])])


])

AC_DEFUN(CURL_CHECK_GETHOSTBYNAME_R,
[
  dnl check for number of arguments to gethostbyname_r. it might take
  dnl either 3, 5, or 6 arguments.
  AC_CHECK_FUNCS(gethostbyname_r,[
    AC_MSG_CHECKING(if gethostbyname_r takes 3 arguments)
    AC_TRY_RUN([
#include <string.h>
#include <sys/types.h>
#include <netdb.h>

int
main () {
struct hostent h;
struct hostent_data hdata;
char *name = "localhost";
int rc;
memset(&h, 0, sizeof(struct hostent));
memset(&hdata, 0, sizeof(struct hostent_data));
rc = gethostbyname_r(name, &h, &hdata);
exit (rc != 0 ? 1 : 0); }],[
      AC_MSG_RESULT(yes)
      AC_DEFINE(HAVE_GETHOSTBYNAME_R_3)
      ac_cv_gethostbyname_args=3],[
      AC_MSG_RESULT(no)
      AC_MSG_CHECKING(if gethostbyname_r with -D_REENTRANT takes 3 arguments)
      AC_TRY_RUN([
#define _REENTRANT

#include <string.h>
#include <sys/types.h>
#include <netdb.h>

int
main () {
struct hostent h;
struct hostent_data hdata;
char *name = "localhost";
int rc;
memset(&h, 0, sizeof(struct hostent));
memset(&hdata, 0, sizeof(struct hostent_data));
rc = gethostbyname_r(name, &h, &hdata);
exit (rc != 0 ? 1 : 0); }],[
	AC_MSG_RESULT(yes)
	AC_DEFINE(HAVE_GETHOSTBYNAME_R_3)
	AC_DEFINE(NEED_REENTRANT)
	ac_cv_gethostbyname_args=3],[
	AC_MSG_RESULT(no)
	AC_MSG_CHECKING(if gethostbyname_r takes 5 arguments)
	AC_TRY_RUN([
#include <sys/types.h>
#include <netdb.h>

int
main () {
struct hostent *hp;
struct hostent h;
char *name = "localhost";
char buffer[8192];
int h_errno;
hp = gethostbyname_r(name, &h, buffer, 8192, &h_errno);
exit (hp == NULL ? 1 : 0); }],[
	  AC_MSG_RESULT(yes)
	  AC_DEFINE(HAVE_GETHOSTBYNAME_R_5)
          ac_cv_gethostbyname_args=5],[
	  AC_MSG_RESULT(no)
	  AC_MSG_CHECKING(if gethostbyname_r takes 6 arguments)
	  AC_TRY_RUN([
#include <sys/types.h>
#include <netdb.h>

int
main () {
struct hostent h;
struct hostent *hp;
char *name = "localhost";
char buf[8192];
int rc;
int h_errno;
rc = gethostbyname_r(name, &h, buf, 8192, &hp, &h_errno);
exit (rc != 0 ? 1 : 0); }],[
	    AC_MSG_RESULT(yes)
	    AC_DEFINE(HAVE_GETHOSTBYNAME_R_6)
            ac_cv_gethostbyname_args=6],[
	    AC_MSG_RESULT(no)
	    have_missing_r_funcs="$have_missing_r_funcs gethostbyname_r"],
	    [ac_cv_gethostbyname_args=0])],
	  [ac_cv_gethostbyname_args=0])],
	[ac_cv_gethostbyname_args=0])],
      [ac_cv_gethostbyname_args=0])])

if test "$ac_cv_func_gethostbyname_r" = "yes"; then
  if test "$ac_cv_gethostbyname_args" = "0"; then
    dnl there's a gethostbyname_r() function, but we don't know how
    dnl many arguments it wants!
    AC_MSG_ERROR([couldn't figure out how to use gethostbyname_r()])
  fi
fi
])