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dnl @synopsis ACX_WHICH_GETHOSTBYNAME_R
dnl
dnl Provides a test to determine the correct way to call gethostbyname_r
dnl
dnl defines HAVE_GETHOSTBYNAME_R to the number of arguments required
dnl
dnl e.g. 6 arguments (linux)
dnl e.g. 5 arguments (solaris)
dnl e.g. 3 arguments (osf/1)
dnl
dnl @author Brian Stafford <brian@stafford.uklinux.net>
dnl
dnl based on version by Caolan McNamara <caolan@skynet.ie>
dnl based on David Arnold's autoconf suggestion in the threads faq
dnl
AC_DEFUN([ACX_WHICH_GETHOSTBYNAME_R],
[AC_CACHE_CHECK(number of arguments to gethostbyname_r,
acx_which_gethostbyname_r, [
AC_TRY_COMPILE([
# include <netdb.h>
], [
char *name;
struct hostent *he;
struct hostent_data data;
(void) gethostbyname_r(name, he, &data);
],acx_which_gethostbyname_r=3,
[
dnl acx_which_gethostbyname_r=0
AC_TRY_COMPILE([
# include <netdb.h>
], [
char *name;
struct hostent *he, *res;
char *buffer = NULL;
int buflen = 2048;
int h_errnop;
(void) gethostbyname_r(name, he, buffer, buflen, &res, &h_errnop)
],acx_which_gethostbyname_r=6,
[
dnl acx_which_gethostbyname_r=0
AC_TRY_COMPILE([
# include <netdb.h>
], [
char *name;
struct hostent *he;
char *buffer = NULL;
int buflen = 2048;
int h_errnop;
(void) gethostbyname_r(name, he, buffer, buflen, &h_errnop)
],acx_which_gethostbyname_r=5,acx_which_gethostbyname_r=0)
]
)
]
)
])
if test $acx_which_gethostbyname_r -gt 0 ; then
AC_DEFINE_UNQUOTED([HAVE_GETHOSTBYNAME_R], $acx_which_gethostbyname_r,
[Number of parameters to gethostbyname_r or 0 if not available])
fi
])
dnl @synopsis ACX_HELP_STRING(OPTION,DESCRIPTION)
AC_DEFUN([ACX_HELP_STRING],
[ $1 builtin([substr],[ ],len($1))[$2]])
dnl @synopsis ACX_FEATURE(ENABLE_OR_WITH,NAME[,VALUE])
AC_DEFUN([ACX_FEATURE],
[echo "builtin([substr],[ ],len(--$1-$2))--$1-$2: ifelse($3,,[$]translit($1-$2,-,_),$3)"])