* io.c (rb_close_before_exec): use F_MAXFD if available.

F_MAXFD is available on NetBSD since NetBSD 2.0.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@33650 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Mon Nov  7 19:43:10 2011  Tanaka Akira  <akr@fsij.org>
+
+	* io.c (rb_close_before_exec): use F_MAXFD if available.
+	  F_MAXFD is available on NetBSD since NetBSD 2.0.
+
 Mon Nov  7 19:25:16 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* test/ruby/test_io_m17n.rb

io.c

@@ -5123,6 +5123,13 @@ rb_close_before_exec(int lowfd, int maxhint, VALUE noclose_fds)
     int max = max_file_descriptor;
     if (max < maxhint)
         max = maxhint;
+#ifdef F_MAXFD
+    /* F_MAXFD is available since NetBSD 2.0. */
+    ret = fcntl(0, F_MAXFD);
+    if (ret != -1) {
+        max = ret;
+    }
+#endif
     for (fd = lowfd; fd <= max; fd++) {
         if (!NIL_P(noclose_fds) &&
             RTEST(rb_hash_lookup(noclose_fds, INT2FIX(fd))))