curl-functions.m4

            return 1;
        ]])
      ],[
        AC_MSG_RESULT([yes])
        tst_compi_getservbyport_r="yes"
        tst_nargs_getservbyport_r="6"
      ],[
        AC_MSG_RESULT([no])
        tst_compi_getservbyport_r="no"
      ])
    fi
    AC_MSG_CHECKING([if getservbyport_r is compilable])
    if test "$tst_compi_getservbyport_r" = "yes"; then
      AC_MSG_RESULT([yes])
    else
      AC_MSG_RESULT([no])
    fi
  fi
  #
  if test "$tst_compi_getservbyport_r" = "yes"; then
    AC_MSG_CHECKING([if getservbyport_r usage allowed])
    if test "x$curl_disallow_getservbyport_r" != "xyes"; then
      AC_MSG_RESULT([yes])
      tst_allow_getservbyport_r="yes"
    else
      AC_MSG_RESULT([no])
      tst_allow_getservbyport_r="no"
    fi
  fi
  #
  AC_MSG_CHECKING([if getservbyport_r might be used])
  if test "$tst_links_getservbyport_r" = "yes" &&
     test "$tst_proto_getservbyport_r" = "yes" &&
     test "$tst_compi_getservbyport_r" = "yes" &&
     test "$tst_allow_getservbyport_r" = "yes"; then
    AC_MSG_RESULT([yes])
    AC_DEFINE_UNQUOTED(HAVE_GETSERVBYPORT_R, 1,
      [Define to 1 if you have the getservbyport_r function.])
    AC_DEFINE_UNQUOTED(GETSERVBYPORT_R_ARGS, $tst_nargs_getservbyport_r,
      [Specifies the number of arguments to getservbyport_r])
    if test "$tst_nargs_getservbyport_r" -eq "4"; then
      AC_DEFINE(GETSERVBYPORT_R_BUFSIZE, sizeof(struct servent_data),
        [Specifies the size of the buffer to pass to getservbyport_r])
    else
      AC_DEFINE(GETSERVBYPORT_R_BUFSIZE, 4096,
        [Specifies the size of the buffer to pass to getservbyport_r])
    fi
    ac_cv_func_getservbyport_r="yes"
  else
    AC_MSG_RESULT([no])
    ac_cv_func_getservbyport_r="no"
  fi
])


dnl CURL_CHECK_FUNC_GMTIME_R
dnl -------------------------------------------------
dnl Verify if gmtime_r is available, prototyped, can
dnl be compiled and seems to work. If all of these are
dnl true, and usage has not been previously disallowed
dnl with shell variable curl_disallow_gmtime_r, then
dnl HAVE_GMTIME_R will be defined.

AC_DEFUN([CURL_CHECK_FUNC_GMTIME_R], [
  AC_REQUIRE([CURL_INCLUDES_STDLIB])dnl
  AC_REQUIRE([CURL_INCLUDES_TIME])dnl
  #
  tst_links_gmtime_r="unknown"
  tst_proto_gmtime_r="unknown"
  tst_compi_gmtime_r="unknown"
  tst_works_gmtime_r="unknown"
  tst_allow_gmtime_r="unknown"
  #
  AC_MSG_CHECKING([if gmtime_r can be linked])
  AC_LINK_IFELSE([
    AC_LANG_FUNC_LINK_TRY([gmtime_r])
  ],[
    AC_MSG_RESULT([yes])
    tst_links_gmtime_r="yes"
  ],[
    AC_MSG_RESULT([no])
    tst_links_gmtime_r="no"
  ])
  #
  if test "$tst_links_gmtime_r" = "yes"; then
    AC_MSG_CHECKING([if gmtime_r is prototyped])
    AC_EGREP_CPP([gmtime_r],[
      $curl_includes_time
    ],[
      AC_MSG_RESULT([yes])
      tst_proto_gmtime_r="yes"
    ],[
      AC_MSG_RESULT([no])
      tst_proto_gmtime_r="no"
    ])
  fi
  #
  if test "$tst_proto_gmtime_r" = "yes"; then
    AC_MSG_CHECKING([if gmtime_r is compilable])
    AC_COMPILE_IFELSE([
      AC_LANG_PROGRAM([[
        $curl_includes_time
      ]],[[
        if(0 != gmtime_r(0, 0))
          return 1;
      ]])
    ],[
      AC_MSG_RESULT([yes])
      tst_compi_gmtime_r="yes"
    ],[
      AC_MSG_RESULT([no])
      tst_compi_gmtime_r="no"
    ])
  fi
  #
  dnl only do runtime verification when not cross-compiling
  if test "x$cross_compiling" != "xyes" &&
    test "$tst_compi_gmtime_r" = "yes"; then
    AC_MSG_CHECKING([if gmtime_r seems to work])
    AC_RUN_IFELSE([
      AC_LANG_PROGRAM([[
        $curl_includes_stdlib
        $curl_includes_time
      ]],[[
        time_t local = 1170352587;
        struct tm *gmt = 0;
        struct tm result;
        gmt = gmtime_r(&local, &result);
        if(gmt)
          exit(0);
        else
          exit(1);
      ]])
    ],[
      AC_MSG_RESULT([yes])
      tst_works_gmtime_r="yes"
    ],[
      AC_MSG_RESULT([no])
      tst_works_gmtime_r="no"
    ])
  fi
  #
  if test "$tst_compi_gmtime_r" = "yes" &&
    test "$tst_works_gmtime_r" != "no"; then
    AC_MSG_CHECKING([if gmtime_r usage allowed])
    if test "x$curl_disallow_gmtime_r" != "xyes"; then
      AC_MSG_RESULT([yes])
      tst_allow_gmtime_r="yes"
    else
      AC_MSG_RESULT([no])
      tst_allow_gmtime_r="no"
    fi
  fi
  #
  AC_MSG_CHECKING([if gmtime_r might be used])
  if test "$tst_links_gmtime_r" = "yes" &&
     test "$tst_proto_gmtime_r" = "yes" &&
     test "$tst_compi_gmtime_r" = "yes" &&
     test "$tst_allow_gmtime_r" = "yes" &&
     test "$tst_works_gmtime_r" != "no"; then
    AC_MSG_RESULT([yes])
    AC_DEFINE_UNQUOTED(HAVE_GMTIME_R, 1,
      [Define to 1 if you have a working gmtime_r function.])
    ac_cv_func_gmtime_r="yes"
  else
    AC_MSG_RESULT([no])
    ac_cv_func_gmtime_r="no"
  fi
])


dnl CURL_CHECK_FUNC_INET_NTOA_R
dnl -------------------------------------------------
dnl Verify if inet_ntoa_r is available, prototyped,
dnl and can be compiled. If all of these are true, and
dnl usage has not been previously disallowed with
dnl shell variable curl_disallow_inet_ntoa_r, then
dnl HAVE_INET_NTOA_R will be defined.

AC_DEFUN([CURL_CHECK_FUNC_INET_NTOA_R], [
  AC_REQUIRE([CURL_INCLUDES_ARPA_INET])dnl
  #
  tst_links_inet_ntoa_r="unknown"
  tst_proto_inet_ntoa_r="unknown"
  tst_compi_inet_ntoa_r="unknown"
  tst_allow_inet_ntoa_r="unknown"
  tst_nargs_inet_ntoa_r="unknown"
  #
  AC_MSG_CHECKING([if inet_ntoa_r can be linked])
  AC_LINK_IFELSE([
    AC_LANG_FUNC_LINK_TRY([inet_ntoa_r])
  ],[
    AC_MSG_RESULT([yes])
    tst_links_inet_ntoa_r="yes"
  ],[
    AC_MSG_RESULT([no])
    tst_links_inet_ntoa_r="no"
  ])
  #
  if test "$tst_links_inet_ntoa_r" = "yes"; then
    AC_MSG_CHECKING([if inet_ntoa_r is prototyped])
    AC_EGREP_CPP([inet_ntoa_r],[
      $curl_includes_arpa_inet
    ],[
      AC_MSG_RESULT([yes])
      tst_proto_inet_ntoa_r="yes"
    ],[
      AC_MSG_RESULT([no])
      tst_proto_inet_ntoa_r="no"
    ])
  fi
  #
  if test "$tst_proto_inet_ntoa_r" = "yes"; then
    if test "$tst_nargs_inet_ntoa_r" = "unknown"; then
      AC_MSG_CHECKING([if inet_ntoa_r takes 2 args.])
      AC_COMPILE_IFELSE([
        AC_LANG_PROGRAM([[
          $curl_includes_arpa_inet
        ]],[[
          struct in_addr addr;
          if(0 != inet_ntoa_r(addr, 0))
            return 1;
        ]])
      ],[
        AC_MSG_RESULT([yes])
        tst_compi_inet_ntoa_r="yes"
        tst_nargs_inet_ntoa_r="2"
      ],[
        AC_MSG_RESULT([no])
        tst_compi_inet_ntoa_r="no"
      ])
    fi
    if test "$tst_nargs_inet_ntoa_r" = "unknown"; then
      AC_MSG_CHECKING([if inet_ntoa_r takes 3 args.])
      AC_COMPILE_IFELSE([
        AC_LANG_PROGRAM([[
          $curl_includes_arpa_inet
        ]],[[
          struct in_addr addr;
          if(0 != inet_ntoa_r(addr, 0, 0))
            return 1;
        ]])
      ],[
        AC_MSG_RESULT([yes])
        tst_compi_inet_ntoa_r="yes"
        tst_nargs_inet_ntoa_r="3"
      ],[
        AC_MSG_RESULT([no])
        tst_compi_inet_ntoa_r="no"
      ])
    fi
    AC_MSG_CHECKING([if inet_ntoa_r is compilable])
    if test "$tst_compi_inet_ntoa_r" = "yes"; then
      AC_MSG_RESULT([yes])
    else
      AC_MSG_RESULT([no])
    fi
  fi
  #
  if test "$tst_compi_inet_ntoa_r" = "yes"; then
    AC_MSG_CHECKING([if inet_ntoa_r usage allowed])
    if test "x$curl_disallow_inet_ntoa_r" != "xyes"; then
      AC_MSG_RESULT([yes])
      tst_allow_inet_ntoa_r="yes"
    else
      AC_MSG_RESULT([no])
      tst_allow_inet_ntoa_r="no"
    fi
  fi
  #
  AC_MSG_CHECKING([if inet_ntoa_r might be used])
  if test "$tst_links_inet_ntoa_r" = "yes" &&
     test "$tst_proto_inet_ntoa_r" = "yes" &&
     test "$tst_compi_inet_ntoa_r" = "yes" &&
     test "$tst_allow_inet_ntoa_r" = "yes"; then
    AC_MSG_RESULT([yes])
    AC_DEFINE_UNQUOTED(HAVE_INET_NTOA_R, 1,
      [Define to 1 if you have the inet_ntoa_r function.])
    dnl AC_DEFINE_UNQUOTED(INET_NTOA_R_ARGS, $tst_nargs_inet_ntoa_r,
    dnl   [Specifies the number of arguments to inet_ntoa_r])
    #
    if test "$tst_nargs_inet_ntoa_r" -eq "2"; then
      AC_DEFINE(HAVE_INET_NTOA_R_2, 1, [inet_ntoa_r() takes 2 args])
    elif test "$tst_nargs_inet_ntoa_r" -eq "3"; then
      AC_DEFINE(HAVE_INET_NTOA_R_3, 1, [inet_ntoa_r() takes 3 args])
    fi
    #
    ac_cv_func_inet_ntoa_r="yes"
  else
    AC_MSG_RESULT([no])
    ac_cv_func_inet_ntoa_r="no"
  fi
])


dnl CURL_CHECK_FUNC_INET_NTOP
dnl -------------------------------------------------
dnl Verify if inet_ntop is available, prototyped, can
dnl be compiled and seems to work. If all of these are
dnl true, and usage has not been previously disallowed
dnl with shell variable curl_disallow_inet_ntop, then
dnl HAVE_INET_NTOP will be defined.

AC_DEFUN([CURL_CHECK_FUNC_INET_NTOP], [
  AC_REQUIRE([CURL_INCLUDES_STDLIB])dnl
  AC_REQUIRE([CURL_INCLUDES_ARPA_INET])dnl
  AC_REQUIRE([CURL_INCLUDES_STRING])dnl
  #
  tst_links_inet_ntop="unknown"
  tst_proto_inet_ntop="unknown"
  tst_compi_inet_ntop="unknown"
  tst_works_inet_ntop="unknown"
  tst_allow_inet_ntop="unknown"
  #
  AC_MSG_CHECKING([if inet_ntop can be linked])
  AC_LINK_IFELSE([
    AC_LANG_FUNC_LINK_TRY([inet_ntop])
  ],[
    AC_MSG_RESULT([yes])
    tst_links_inet_ntop="yes"
  ],[
    AC_MSG_RESULT([no])
    tst_links_inet_ntop="no"
  ])
  #
  if test "$tst_links_inet_ntop" = "yes"; then
    AC_MSG_CHECKING([if inet_ntop is prototyped])
    AC_EGREP_CPP([inet_ntop],[
      $curl_includes_arpa_inet
    ],[
      AC_MSG_RESULT([yes])
      tst_proto_inet_ntop="yes"
    ],[
      AC_MSG_RESULT([no])
      tst_proto_inet_ntop="no"
    ])
  fi
  #
  if test "$tst_proto_inet_ntop" = "yes"; then
    AC_MSG_CHECKING([if inet_ntop is compilable])
    AC_COMPILE_IFELSE([
      AC_LANG_PROGRAM([[
        $curl_includes_arpa_inet
      ]],[[
        if(0 != inet_ntop(0, 0, 0, 0))
          return 1;
      ]])
    ],[
      AC_MSG_RESULT([yes])
      tst_compi_inet_ntop="yes"
    ],[
      AC_MSG_RESULT([no])
      tst_compi_inet_ntop="no"
    ])
  fi
  #
  dnl only do runtime verification when not cross-compiling
  if test "x$cross_compiling" != "xyes" &&
    test "$tst_compi_inet_ntop" = "yes"; then
    AC_MSG_CHECKING([if inet_ntop seems to work])
    AC_RUN_IFELSE([
      AC_LANG_PROGRAM([[
        $curl_includes_stdlib
        $curl_includes_arpa_inet
        $curl_includes_string
      ]],[[
        char ipv6res[sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")];
        char ipv4res[sizeof "255.255.255.255"];
        unsigned char ipv6a[26];
        unsigned char ipv4a[5];
        char *ipv6ptr = 0;
        char *ipv4ptr = 0;
        /* - */
        ipv4res[0] = '\0';
        ipv4a[0] = 0xc0;
        ipv4a[1] = 0xa8;
        ipv4a[2] = 0x64;
        ipv4a[3] = 0x01;
        ipv4a[4] = 0x01;
        /* - */
        ipv4ptr = inet_ntop(AF_INET, ipv4a, ipv4res, sizeof(ipv4res));
        if(!ipv4ptr)
          exit(1); /* fail */
        if(ipv4ptr != ipv4res)
          exit(1); /* fail */
        if(!ipv4ptr[0])
          exit(1); /* fail */
        if(memcmp(ipv4res, "192.168.100.1", 13) != 0)
          exit(1); /* fail */
        /* - */
        ipv6res[0] = '\0';
        memset(ipv6a, 0, sizeof(ipv6a));
        ipv6a[0] = 0xfe;
        ipv6a[1] = 0x80;
        ipv6a[8] = 0x02;
        ipv6a[9] = 0x14;
        ipv6a[10] = 0x4f;
        ipv6a[11] = 0xff;
        ipv6a[12] = 0xfe;
        ipv6a[13] = 0x0b;
        ipv6a[14] = 0x76;
        ipv6a[15] = 0xc8;
        ipv6a[25] = 0x01;
        /* - */
        ipv6ptr = inet_ntop(AF_INET6, ipv6a, ipv6res, sizeof(ipv6res));
        if(!ipv6ptr)
          exit(1); /* fail */
        if(ipv6ptr != ipv6res)
          exit(1); /* fail */
        if(!ipv6ptr[0])
          exit(1); /* fail */
        if(memcmp(ipv6res, "fe80::214:4fff:fe0b:76c8", 24) != 0)
          exit(1); /* fail */
        /* - */
        exit(0);
      ]])
    ],[
      AC_MSG_RESULT([yes])
      tst_works_inet_ntop="yes"
    ],[
      AC_MSG_RESULT([no])
      tst_works_inet_ntop="no"
    ])
  fi
  #
  if test "$tst_compi_inet_ntop" = "yes" &&
    test "$tst_works_inet_ntop" != "no"; then
    AC_MSG_CHECKING([if inet_ntop usage allowed])
    if test "x$curl_disallow_inet_ntop" != "xyes"; then
      AC_MSG_RESULT([yes])
      tst_allow_inet_ntop="yes"
    else
      AC_MSG_RESULT([no])
      tst_allow_inet_ntop="no"
    fi
  fi
  #
  AC_MSG_CHECKING([if inet_ntop might be used])
  if test "$tst_links_inet_ntop" = "yes" &&
     test "$tst_proto_inet_ntop" = "yes" &&
     test "$tst_compi_inet_ntop" = "yes" &&
     test "$tst_allow_inet_ntop" = "yes" &&
     test "$tst_works_inet_ntop" != "no"; then
    AC_MSG_RESULT([yes])
    AC_DEFINE_UNQUOTED(HAVE_INET_NTOP, 1,
      [Define to 1 if you have a IPv6 capable working inet_ntop function.])
    ac_cv_func_inet_ntop="yes"
  else
    AC_MSG_RESULT([no])
    ac_cv_func_inet_ntop="no"
  fi
])


dnl CURL_CHECK_FUNC_INET_PTON
dnl -------------------------------------------------
dnl Verify if inet_pton is available, prototyped, can
dnl be compiled and seems to work. If all of these are
dnl true, and usage has not been previously disallowed
dnl with shell variable curl_disallow_inet_pton, then
dnl HAVE_INET_PTON will be defined.

AC_DEFUN([CURL_CHECK_FUNC_INET_PTON], [
  AC_REQUIRE([CURL_INCLUDES_STDLIB])dnl
  AC_REQUIRE([CURL_INCLUDES_ARPA_INET])dnl
  AC_REQUIRE([CURL_INCLUDES_STRING])dnl
  #
  tst_links_inet_pton="unknown"
  tst_proto_inet_pton="unknown"
  tst_compi_inet_pton="unknown"
  tst_works_inet_pton="unknown"
  tst_allow_inet_pton="unknown"
  #
  AC_MSG_CHECKING([if inet_pton can be linked])
  AC_LINK_IFELSE([
    AC_LANG_FUNC_LINK_TRY([inet_pton])
  ],[
    AC_MSG_RESULT([yes])
    tst_links_inet_pton="yes"
  ],[
    AC_MSG_RESULT([no])
    tst_links_inet_pton="no"
  ])
  #
  if test "$tst_links_inet_pton" = "yes"; then
    AC_MSG_CHECKING([if inet_pton is prototyped])
    AC_EGREP_CPP([inet_pton],[
      $curl_includes_arpa_inet
    ],[
      AC_MSG_RESULT([yes])
      tst_proto_inet_pton="yes"
    ],[
      AC_MSG_RESULT([no])
      tst_proto_inet_pton="no"
    ])
  fi
  #
  if test "$tst_proto_inet_pton" = "yes"; then
    AC_MSG_CHECKING([if inet_pton is compilable])
    AC_COMPILE_IFELSE([
      AC_LANG_PROGRAM([[
        $curl_includes_arpa_inet
      ]],[[
        if(0 != inet_pton(0, 0, 0))
          return 1;
      ]])
    ],[
      AC_MSG_RESULT([yes])
      tst_compi_inet_pton="yes"
    ],[
      AC_MSG_RESULT([no])
      tst_compi_inet_pton="no"
    ])
  fi
  #
  dnl only do runtime verification when not cross-compiling
  if test "x$cross_compiling" != "xyes" &&
    test "$tst_compi_inet_pton" = "yes"; then
    AC_MSG_CHECKING([if inet_pton seems to work])
    AC_RUN_IFELSE([
      AC_LANG_PROGRAM([[
        $curl_includes_stdlib
        $curl_includes_arpa_inet
        $curl_includes_string
      ]],[[
        unsigned char ipv6a[26];
        unsigned char ipv4a[5];
        const char *ipv6src = "fe80::214:4fff:fe0b:76c8";
        const char *ipv4src = "192.168.100.1";
        /* - */
        memset(ipv4a, 1, sizeof(ipv4a));
        if(1 != inet_pton(AF_INET, ipv4src, ipv4a))
          exit(1); /* fail */
        /* - */
        if( (ipv4a[0] != 0xc0) ||
            (ipv4a[1] != 0xa8) ||
            (ipv4a[2] != 0x64) ||
            (ipv4a[3] != 0x01) ||
            (ipv4a[4] != 0x01) )
          exit(1); /* fail */
        /* - */
        memset(ipv6a, 1, sizeof(ipv6a));
        if(1 != inet_pton(AF_INET6, ipv6src, ipv6a))
          exit(1); /* fail */
        /* - */
        ipv6res[0] = '\0';
        memset(ipv6a, 0, sizeof(ipv6a));
        if( (ipv6a[0]  != 0xfe) ||
            (ipv6a[1]  != 0x80) ||
            (ipv6a[8]  != 0x02) ||
            (ipv6a[9]  != 0x14) ||
            (ipv6a[10] != 0x4f) ||
            (ipv6a[11] != 0xff) ||
            (ipv6a[12] != 0xfe) ||
            (ipv6a[13] != 0x0b) ||
            (ipv6a[14] != 0x76) ||
            (ipv6a[15] != 0xc8) ||
            (ipv6a[25] != 0x01) )
          exit(1); /* fail */
        /* - */
        if( (ipv6a[2]  != 0x0) ||
            (ipv6a[3]  != 0x0) ||
            (ipv6a[4]  != 0x0) ||
            (ipv6a[5]  != 0x0) ||
            (ipv6a[6]  != 0x0) ||
            (ipv6a[7]  != 0x0) ||
            (ipv6a[16] != 0x0) ||
            (ipv6a[17] != 0x0) ||
            (ipv6a[18] != 0x0) ||
            (ipv6a[19] != 0x0) ||
            (ipv6a[20] != 0x0) ||
            (ipv6a[21] != 0x0) ||
            (ipv6a[22] != 0x0) ||
            (ipv6a[23] != 0x0) ||
            (ipv6a[24] != 0x0) )
          exit(1); /* fail */
        /* - */
        exit(0);
      ]])
    ],[
      AC_MSG_RESULT([yes])
      tst_works_inet_pton="yes"
    ],[
      AC_MSG_RESULT([no])
      tst_works_inet_pton="no"
    ])
  fi
  #
  if test "$tst_compi_inet_pton" = "yes" &&
    test "$tst_works_inet_pton" != "no"; then
    AC_MSG_CHECKING([if inet_pton usage allowed])
    if test "x$curl_disallow_inet_pton" != "xyes"; then
      AC_MSG_RESULT([yes])
      tst_allow_inet_pton="yes"
    else
      AC_MSG_RESULT([no])
      tst_allow_inet_pton="no"
    fi
  fi
  #
  AC_MSG_CHECKING([if inet_pton might be used])
  if test "$tst_links_inet_pton" = "yes" &&
     test "$tst_proto_inet_pton" = "yes" &&
     test "$tst_compi_inet_pton" = "yes" &&
     test "$tst_allow_inet_pton" = "yes" &&
     test "$tst_works_inet_pton" != "no"; then
    AC_MSG_RESULT([yes])
    AC_DEFINE_UNQUOTED(HAVE_INET_PTON, 1,
      [Define to 1 if you have a IPv6 capable working inet_pton function.])
    ac_cv_func_inet_pton="yes"
  else
    AC_MSG_RESULT([no])
    ac_cv_func_inet_pton="no"
  fi
])


dnl CURL_CHECK_FUNC_LOCALTIME_R
dnl -------------------------------------------------
dnl Verify if localtime_r is available, prototyped, can
dnl be compiled and seems to work. If all of these are
dnl true, and usage has not been previously disallowed
dnl with shell variable curl_disallow_localtime_r, then
dnl HAVE_LOCALTIME_R will be defined.

AC_DEFUN([CURL_CHECK_FUNC_LOCALTIME_R], [
  AC_REQUIRE([CURL_INCLUDES_STDLIB])dnl
  AC_REQUIRE([CURL_INCLUDES_TIME])dnl
  #
  tst_links_localtime_r="unknown"
  tst_proto_localtime_r="unknown"
  tst_compi_localtime_r="unknown"
  tst_works_localtime_r="unknown"
  tst_allow_localtime_r="unknown"
  #
  AC_MSG_CHECKING([if localtime_r can be linked])
  AC_LINK_IFELSE([
    AC_LANG_FUNC_LINK_TRY([localtime_r])
  ],[
    AC_MSG_RESULT([yes])
    tst_links_localtime_r="yes"
  ],[
    AC_MSG_RESULT([no])
    tst_links_localtime_r="no"
  ])
  #
  if test "$tst_links_localtime_r" = "yes"; then
    AC_MSG_CHECKING([if localtime_r is prototyped])
    AC_EGREP_CPP([localtime_r],[
      $curl_includes_time
    ],[
      AC_MSG_RESULT([yes])
      tst_proto_localtime_r="yes"
    ],[
      AC_MSG_RESULT([no])
      tst_proto_localtime_r="no"
    ])
  fi
  #
  if test "$tst_proto_localtime_r" = "yes"; then
    AC_MSG_CHECKING([if localtime_r is compilable])
    AC_COMPILE_IFELSE([
      AC_LANG_PROGRAM([[
        $curl_includes_time
      ]],[[
        if(0 != localtime_r(0, 0))
          return 1;
      ]])
    ],[
      AC_MSG_RESULT([yes])
      tst_compi_localtime_r="yes"
    ],[
      AC_MSG_RESULT([no])
      tst_compi_localtime_r="no"
    ])
  fi
  #
  dnl only do runtime verification when not cross-compiling
  if test "x$cross_compiling" != "xyes" &&
    test "$tst_compi_localtime_r" = "yes"; then
    AC_MSG_CHECKING([if localtime_r seems to work])
    AC_RUN_IFELSE([
      AC_LANG_PROGRAM([[
        $curl_includes_stdlib
        $curl_includes_time
      ]],[[
        time_t clock = 1170352587;
        struct tm *tmp = 0;
        struct tm result;
        tmp = localtime_r(&clock, &result);
        if(tmp)
          exit(0);
        else
          exit(1);
      ]])
    ],[
      AC_MSG_RESULT([yes])
      tst_works_localtime_r="yes"
    ],[
      AC_MSG_RESULT([no])
      tst_works_localtime_r="no"
    ])
  fi
  #
  if test "$tst_compi_localtime_r" = "yes" &&
    test "$tst_works_localtime_r" != "no"; then
    AC_MSG_CHECKING([if localtime_r usage allowed])
    if test "x$curl_disallow_localtime_r" != "xyes"; then
      AC_MSG_RESULT([yes])
      tst_allow_localtime_r="yes"
    else
      AC_MSG_RESULT([no])
      tst_allow_localtime_r="no"
    fi
  fi
  #
  AC_MSG_CHECKING([if localtime_r might be used])
  if test "$tst_links_localtime_r" = "yes" &&
     test "$tst_proto_localtime_r" = "yes" &&
     test "$tst_compi_localtime_r" = "yes" &&
     test "$tst_allow_localtime_r" = "yes" &&
     test "$tst_works_localtime_r" != "no"; then
    AC_MSG_RESULT([yes])
    AC_DEFINE_UNQUOTED(HAVE_LOCALTIME_R, 1,
      [Define to 1 if you have a working localtime_r function.])
    ac_cv_func_localtime_r="yes"
  else
    AC_MSG_RESULT([no])
    ac_cv_func_localtime_r="no"
  fi
])


dnl CURL_CHECK_FUNC_SIGACTION
dnl -------------------------------------------------
dnl Verify if sigaction is available, prototyped, and
dnl can be compiled. If all of these are true, and
dnl usage has not been previously disallowed with
dnl shell variable curl_disallow_sigaction, then
dnl HAVE_SIGACTION will be defined.

AC_DEFUN([CURL_CHECK_FUNC_SIGACTION], [
  AC_REQUIRE([CURL_INCLUDES_SIGNAL])dnl
  #
  tst_links_sigaction="unknown"
  tst_proto_sigaction="unknown"
  tst_compi_sigaction="unknown"
  tst_allow_sigaction="unknown"
  #
  AC_MSG_CHECKING([if sigaction can be linked])
  AC_LINK_IFELSE([
    AC_LANG_FUNC_LINK_TRY([sigaction])
  ],[
    AC_MSG_RESULT([yes])
    tst_links_sigaction="yes"
  ],[
    AC_MSG_RESULT([no])
    tst_links_sigaction="no"
  ])
  #
  if test "$tst_links_sigaction" = "yes"; then
    AC_MSG_CHECKING([if sigaction is prototyped])
    AC_EGREP_CPP([sigaction],[
      $curl_includes_signal
    ],[
      AC_MSG_RESULT([yes])
      tst_proto_sigaction="yes"
    ],[
      AC_MSG_RESULT([no])
      tst_proto_sigaction="no"
    ])
  fi
  #
  if test "$tst_proto_sigaction" = "yes"; then
    AC_MSG_CHECKING([if sigaction is compilable])
    AC_COMPILE_IFELSE([
      AC_LANG_PROGRAM([[
        $curl_includes_signal
      ]],[[
        if(0 != sigaction(0, 0, 0))
          return 1;
      ]])
    ],[
      AC_MSG_RESULT([yes])
      tst_compi_sigaction="yes"
    ],[
      AC_MSG_RESULT([no])
      tst_compi_sigaction="no"
    ])
  fi
  #
  if test "$tst_compi_sigaction" = "yes"; then
    AC_MSG_CHECKING([if sigaction usage allowed])
    if test "x$curl_disallow_sigaction" != "xyes"; then
      AC_MSG_RESULT([yes])
      tst_allow_sigaction="yes"
    else
      AC_MSG_RESULT([no])
      tst_allow_sigaction="no"
    fi
  fi
  #
  AC_MSG_CHECKING([if sigaction might be used])
  if test "$tst_links_sigaction" = "yes" &&
     test "$tst_proto_sigaction" = "yes" &&
     test "$tst_compi_sigaction" = "yes" &&
     test "$tst_allow_sigaction" = "yes"; then
    AC_MSG_RESULT([yes])
    AC_DEFINE_UNQUOTED(HAVE_SIGACTION, 1,
      [Define to 1 if you have the sigaction function.])
    ac_cv_func_sigaction="yes"
  else
    AC_MSG_RESULT([no])
    ac_cv_func_sigaction="no"
  fi
])


dnl CURL_CHECK_FUNC_SIGINTERRUPT
dnl -------------------------------------------------
dnl Verify if siginterrupt is available, prototyped, and
dnl can be compiled. If all of these are true, and
dnl usage has not been previously disallowed with
dnl shell variable curl_disallow_siginterrupt, then
dnl HAVE_SIGINTERRUPT will be defined.

AC_DEFUN([CURL_CHECK_FUNC_SIGINTERRUPT], [
  AC_REQUIRE([CURL_INCLUDES_SIGNAL])dnl
  #
  tst_links_siginterrupt="unknown"
  tst_proto_siginterrupt="unknown"
  tst_compi_siginterrupt="unknown"
  tst_allow_siginterrupt="unknown"
  #
  AC_MSG_CHECKING([if siginterrupt can be linked])
  AC_LINK_IFELSE([
    AC_LANG_FUNC_LINK_TRY([siginterrupt])
  ],[
    AC_MSG_RESULT([yes])
    tst_links_siginterrupt="yes"
  ],[
    AC_MSG_RESULT([no])
    tst_links_siginterrupt="no"
  ])
  #
  if test "$tst_links_siginterrupt" = "yes"; then
    AC_MSG_CHECKING([if siginterrupt is prototyped])
    AC_EGREP_CPP([siginterrupt],[
      $curl_includes_signal
    ],[
      AC_MSG_RESULT([yes])
      tst_proto_siginterrupt="yes"
    ],[
      AC_MSG_RESULT([no])
      tst_proto_siginterrupt="no"
    ])
  fi
  #
  if test "$tst_proto_siginterrupt" = "yes"; then
    AC_MSG_CHECKING([if siginterrupt is compilable])
    AC_COMPILE_IFELSE([
      AC_LANG_PROGRAM([[
        $curl_includes_signal
      ]],[[
        if(0 != siginterrupt(0, 0))
          return 1;
      ]])
    ],[
      AC_MSG_RESULT([yes])
      tst_compi_siginterrupt="yes"
    ],[
      AC_MSG_RESULT([no])
      tst_compi_siginterrupt="no"
    ])
  fi
  #
  if test "$tst_compi_siginterrupt" = "yes"; then
    AC_MSG_CHECKING([if siginterrupt usage allowed])
    if test "x$curl_disallow_siginterrupt" != "xyes"; then
      AC_MSG_RESULT([yes])
      tst_allow_siginterrupt="yes"
    else
      AC_MSG_RESULT([no])
      tst_allow_siginterrupt="no"
    fi
  fi
  #
  AC_MSG_CHECKING([if siginterrupt might be used])
  if test "$tst_links_siginterrupt" = "yes" &&
     test "$tst_proto_siginterrupt" = "yes" &&
     test "$tst_compi_siginterrupt" = "yes" &&
     test "$tst_allow_siginterrupt" = "yes"; then
    AC_MSG_RESULT([yes])
    AC_DEFINE_UNQUOTED(HAVE_SIGINTERRUPT, 1,
      [Define to 1 if you have the siginterrupt function.])
    ac_cv_func_siginterrupt="yes"
  else
    AC_MSG_RESULT([no])
    ac_cv_func_siginterrupt="no"
  fi
])


dnl CURL_CHECK_FUNC_SIGNAL
dnl -------------------------------------------------
dnl Verify if signal is available, prototyped, and
dnl can be compiled. If all of these are true, and
dnl usage has not been previously disallowed with
dnl shell variable curl_disallow_signal, then
dnl HAVE_SIGNAL will be defined.

AC_DEFUN([CURL_CHECK_FUNC_SIGNAL], [
  AC_REQUIRE([CURL_INCLUDES_SIGNAL])dnl
  #
  tst_links_signal="unknown"
  tst_proto_signal="unknown"
  tst_compi_signal="unknown"
  tst_allow_signal="unknown"
  #
  AC_MSG_CHECKING([if signal can be linked])
  AC_LINK_IFELSE([
    AC_LANG_FUNC_LINK_TRY([signal])
  ],[
    AC_MSG_RESULT([yes])
    tst_links_signal="yes"
  ],[
    AC_MSG_RESULT([no])
    tst_links_signal="no"
  ])
  #
  if test "$tst_links_signal" = "yes"; then
    AC_MSG_CHECKING([if signal is prototyped])
    AC_EGREP_CPP([signal],[
      $curl_includes_signal
    ],[
      AC_MSG_RESULT([yes])
      tst_proto_signal="yes"
    ],[
      AC_MSG_RESULT([no])
      tst_proto_signal="no"
    ])
  fi
  #
  if test "$tst_proto_signal" = "yes"; then
    AC_MSG_CHECKING([if signal is compilable])
    AC_COMPILE_IFELSE([
      AC_LANG_PROGRAM([[
        $curl_includes_signal
      ]],[[
        if(0 != signal(0, 0))
          return 1;
      ]])
    ],[
      AC_MSG_RESULT([yes])
      tst_compi_signal="yes"
    ],[
      AC_MSG_RESULT([no])
      tst_compi_signal="no"
    ])
  fi
  #
  if test "$tst_compi_signal" = "yes"; then
    AC_MSG_CHECKING([if signal usage allowed])
    if test "x$curl_disallow_signal" != "xyes"; then
      AC_MSG_RESULT([yes])
      tst_allow_signal="yes"
    else
      AC_MSG_RESULT([no])
      tst_allow_signal="no"
    fi
  fi
  #
  AC_MSG_CHECKING([if signal might be used])
  if test "$tst_links_signal" = "yes" &&
     test "$tst_proto_signal" = "yes" &&
     test "$tst_compi_signal" = "yes" &&
     test "$tst_allow_signal" = "yes"; then
    AC_MSG_RESULT([yes])
    AC_DEFINE_UNQUOTED(HAVE_SIGNAL, 1,
      [Define to 1 if you have the signal function.])
    ac_cv_func_signal="yes"
  else
    AC_MSG_RESULT([no])
    ac_cv_func_signal="no"
  fi
])


dnl CURL_CHECK_FUNC_SIGSETJMP
dnl -------------------------------------------------
dnl Verify if sigsetjmp is available, prototyped, and
dnl can be compiled. If all of these are true, and
dnl usage has not been previously disallowed with
dnl shell variable curl_disallow_sigsetjmp, then
dnl HAVE_SIGSETJMP will be defined.

AC_DEFUN([CURL_CHECK_FUNC_SIGSETJMP], [
  AC_REQUIRE([CURL_INCLUDES_SETJMP])dnl
  #
  tst_links_sigsetjmp="unknown"