acinclude.m4

   1 dnl @synopsis ACX_WHICH_GETHOSTBYNAME_R
   2 dnl
   3 dnl Provides a test to determine the correct way to call gethostbyname_r
   4 dnl
   5 dnl defines HAVE_GETHOSTBYNAME_R to the number of arguments required
   6 dnl
   7 dnl e.g. 6 arguments (linux)
   8 dnl e.g. 5 arguments (solaris)
   9 dnl e.g. 3 arguments (osf/1)
  10 dnl
  11 dnl @version $Id$
  12 dnl @author Brian Stafford <brian@stafford.uklinux.net>
  13 dnl
  14 dnl based on version by Caolan McNamara <caolan@skynet.ie>
  15 dnl based on David Arnold's autoconf suggestion in the threads faq
  16 dnl
  17 AC_DEFUN(ACX_WHICH_GETHOSTBYNAME_R,
  18 [AC_CACHE_CHECK(number of arguments to gethostbyname_r,
  19                 acx_which_gethostbyname_r, [
  20         AC_TRY_COMPILE([
  21 #               include <netdb.h>
  22         ],      [
  23
  24         char *name;
  25         struct hostent *he;
  26         struct hostent_data data;
  27         (void) gethostbyname_r(name, he, &data);
  28
  29                 ],acx_which_gethostbyname_r=3,
  30                         [
  31 dnl                     acx_which_gethostbyname_r=0
  32   AC_TRY_COMPILE([
  33 #   include <netdb.h>
  34   ], [
  35         char *name;
  36         struct hostent *he, *res;
  37         char *buffer = NULL;
  38         int buflen = 2048;
  39         int h_errnop;
  40         (void) gethostbyname_r(name, he, buffer, buflen, &res, &h_errnop)
  41   ],acx_which_gethostbyname_r=6,
  42
  43   [
  44 dnl  acx_which_gethostbyname_r=0
  45   AC_TRY_COMPILE([
  46 #   include <netdb.h>
  47   ], [
  48                         char *name;
  49                         struct hostent *he;
  50                         char *buffer = NULL;
  51                         int buflen = 2048;
  52                         int h_errnop;
  53                         (void) gethostbyname_r(name, he, buffer, buflen, &h_errnop)
  54   ],acx_which_gethostbyname_r=5,acx_which_gethostbyname_r=0)
  55
  56   ]
  57
  58   )
  59                         ]
  60                 )
  61         ])
  62
  63 if test $acx_which_gethostbyname_r -gt 0 ; then
  64     AC_DEFINE_UNQUOTED([HAVE_GETHOSTBYNAME_R], $acx_which_gethostbyname_r,
  65                        [Number of parameters to gethostbyname_r or 0 if not available])
  66 fi
  67
  68 ])
  69
  70 dnl @synopsis ACX_HELP_STRING(OPTION,DESCRIPTION)
  71 AC_DEFUN([ACX_HELP_STRING],
  72          [  $1 builtin([substr],[                       ],len($1))[$2]])
  73
  74
  75 dnl @synopsis ACX_FEATURE(ENABLE_OR_WITH,NAME[,VALUE])
  76 AC_DEFUN([ACX_FEATURE],
  77          [echo "builtin([substr],[                                  ],len(--$1-$2))--$1-$2: ifelse($3,,[$]translit($1-$2,-,_),$3)"])
  78