* ext/socket/extconf.rb (gai_strerror): checks if available and if

returns const pointer.

* ext/socket/getaddrinfo.c (gai_strerror): defines only if non
  available.  [ruby-core:21328]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@21505 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,11 @@
+Wed Jan 14 13:09:00 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* ext/socket/extconf.rb (gai_strerror): checks if available and if
+	  returns const pointer.
+
+	* ext/socket/getaddrinfo.c (gai_strerror): defines only if non
+	  available.  [ruby-core:21328]
+
 Wed Jan 14 12:39:16 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* io.c (rb_io_wait_readable, rb_io_wait_writable): need rb_fd_ptr.

ext/socket/extconf.rb

@@ -255,6 +255,19 @@ unless getaddr_info_ok and have_func("getnameinfo", headers) and have_func("geta
   have_func("inet_ntop") or have_func("inet_ntoa")
   have_func("inet_pton") or have_func("inet_aton")
   have_func("getservbyport")
+  if have_func("gai_strerror")
+    unless checking_for("gai_strerror() returns const pointer") {!try_compile(<<EOF)}
+#{cpp_include(headers)}
+#include <stdlib.h>
+void
+conftest_gai_strerror_is_const()
+{
+    *gai_strerror(0) = 0;
+}
+EOF
+      $defs << "-DGAI_STRERROR_CONST"
+    end
+  end
   have_header("arpa/nameser.h")
   have_header("resolv.h")
 end

ext/socket/getaddrinfo.c

@@ -39,6 +39,9 @@
  */
 
 #include "ruby/config.h"
+#ifdef RUBY_EXTCONF_H
+#include RUBY_EXTCONF_H
+#endif
 #include <sys/types.h>
 #ifndef _WIN32
 #include <sys/param.h>
@@ -195,8 +198,8 @@ if (pai->ai_flags & AI_CANONNAME) {\
 
 #define ERR(err) { error = (err); goto bad; }
 
-#ifndef __HAIKU__
+#ifndef HAVE_GAI_STRERROR
-#if defined __UCLIBC__
+#ifdef GAI_STRERROR_CONST
 const
 #endif
 char *