* io.c (rb_close_before_exec): more heuristics to detect maximum fd.

git-svn-id: http://svn.ruby-lang.org/repos/ruby/trunk@21347 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 6 insertions, 1 deletions

diff --git a/io.c b/io.c
index ffb407375..46136d7ee 100644
--- a/io.c
+++ b/io.c
@@ -4452,8 +4452,13 @@ rb_close_before_exec(int lowfd, int maxhint, VALUE noclose_fds)
             fcntl(fd, F_SETFD, ret|FD_CLOEXEC);
         }
 #else
-	close(fd);
+	ret = close(fd);
 #endif
+#define CONTIGUOUS_CLOSED_FDS 20
+        if (ret != -1) {
+	    if (max < fd + CONTIGUOUS_CLOSED_FDS)
+		max = fd + CONTIGUOUS_CLOSED_FDS;
+	}
     }
 }