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