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authorYang Tse <yangsita@gmail.com>2008-09-17 08:14:00 +0000
committerYang Tse <yangsita@gmail.com>2008-09-17 08:14:00 +0000
commit638e3c070c00f9e6b1055c7bcdda0564a7af5410 (patch)
tree03a36422f7fdaf52ff846bd31d3e0cb51a22a1a0 /ares/m4
parent07aeac37fd771dbde3b0ad3bb38d7eb29a7b959e (diff)
improve detection of gethostname()
Diffstat (limited to 'ares/m4')
-rw-r--r--ares/m4/cares-functions.m4106
1 files changed, 106 insertions, 0 deletions
diff --git a/ares/m4/cares-functions.m4 b/ares/m4/cares-functions.m4
index d98513573..e1ba24083 100644
--- a/ares/m4/cares-functions.m4
+++ b/ares/m4/cares-functions.m4
@@ -64,6 +64,112 @@ cares_includes_sys_uio="\
])
+dnl CARES_INCLUDES_UNISTD
+dnl -------------------------------------------------
+dnl Set up variable with list of headers that must be
+dnl included when unistd.h is to be included.
+
+AC_DEFUN([CARES_INCLUDES_UNISTD], [
+cares_includes_unistd="\
+/* includes start */
+#ifdef HAVE_SYS_TYPES_H
+# include <sys/types.h>
+#endif
+#ifdef HAVE_UNISTD_H
+# include <unistd.h>
+#endif
+/* includes end */"
+ AC_CHECK_HEADERS(
+ sys/types.h unistd.h,
+ [], [], [$cares_includes_unistd])
+])
+
+
+dnl CARES_CHECK_FUNC_GETHOSTNAME
+dnl -------------------------------------------------
+dnl Verify if gethostname is available, prototyped, and
+dnl can be compiled. If all of these are true, and
+dnl usage has not been previously disallowed with
+dnl shell variable cares_disallow_gethostname, then
+dnl HAVE_GETHOSTNAME will be defined.
+
+AC_DEFUN([CARES_CHECK_FUNC_GETHOSTNAME], [
+ AC_REQUIRE([CARES_INCLUDES_UNISTD])dnl
+ #
+ tst_links_gethostname="unknown"
+ tst_proto_gethostname="unknown"
+ tst_compi_gethostname="unknown"
+ tst_allow_gethostname="unknown"
+ #
+ AC_MSG_CHECKING([if gethostname can be linked])
+ AC_LINK_IFELSE([
+ AC_LANG_FUNC_LINK_TRY([gethostname])
+ ],[
+ AC_MSG_RESULT([yes])
+ tst_links_gethostname="yes"
+ ],[
+ AC_MSG_RESULT([no])
+ tst_links_gethostname="no"
+ ])
+ #
+ if test "$tst_links_gethostname" = "yes"; then
+ AC_MSG_CHECKING([if gethostname is prototyped])
+ AC_EGREP_CPP([gethostname],[
+ $cares_includes_unistd
+ ],[
+ AC_MSG_RESULT([yes])
+ tst_proto_gethostname="yes"
+ ],[
+ AC_MSG_RESULT([no])
+ tst_proto_gethostname="no"
+ ])
+ fi
+ #
+ if test "$tst_proto_gethostname" = "yes"; then
+ AC_MSG_CHECKING([if gethostname is compilable])
+ AC_COMPILE_IFELSE([
+ AC_LANG_PROGRAM([[
+ $cares_includes_unistd
+ ]],[[
+ if(0 != gethostname(0, 0))
+ return 1;
+ ]])
+ ],[
+ AC_MSG_RESULT([yes])
+ tst_compi_gethostname="yes"
+ ],[
+ AC_MSG_RESULT([no])
+ tst_compi_gethostname="no"
+ ])
+ fi
+ #
+ if test "$tst_compi_gethostname" = "yes"; then
+ AC_MSG_CHECKING([if gethostname usage allowed])
+ if test "x$cares_disallow_gethostname" != "xyes"; then
+ AC_MSG_RESULT([yes])
+ tst_allow_gethostname="yes"
+ else
+ AC_MSG_RESULT([no])
+ tst_allow_gethostname="no"
+ fi
+ fi
+ #
+ AC_MSG_CHECKING([if gethostname might be used])
+ if test "$tst_links_gethostname" = "yes" &&
+ test "$tst_proto_gethostname" = "yes" &&
+ test "$tst_compi_gethostname" = "yes" &&
+ test "$tst_allow_gethostname" = "yes"; then
+ AC_MSG_RESULT([yes])
+ AC_DEFINE_UNQUOTED(HAVE_GETHOSTNAME, 1,
+ [Define to 1 if you have the gethostname function.])
+ ac_cv_func_gethostname="yes"
+ else
+ AC_MSG_RESULT([no])
+ ac_cv_func_gethostname="no"
+ fi
+])
+
+
dnl CARES_CHECK_FUNC_STRCASECMP
dnl -------------------------------------------------
dnl Verify if strcasecmp is available, prototyped, and