ruby.c: retry loading with GC

* ruby.c (open_load_file): retry after GC when the limit for open
  file descriptors reached.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56463 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Fri Oct 21 16:06:25 2016  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* ruby.c (open_load_file): retry after GC when the limit for open
+	  file descriptors reached.
+
 Fri Oct 21 11:34:17 2016  Pascal Schmid  <Lechindianer@users.noreply.github.com>
 
 	* string.c (rb_str_sub, rb_str_gsub): [DOC] 'backlash' should read

ruby.c

@@ -1899,7 +1899,13 @@ open_load_file(VALUE fname_v, int *xflag)
 #endif
 
 	if ((fd = rb_cloexec_open(fname, mode, 0)) < 0) {
-	    rb_load_fail(fname_v, strerror(errno));
+	    int e = errno;
+	    if (!rb_gc_for_fd(e)) {
+		rb_load_fail(fname_v, strerror(e));
+	    }
+	    if ((fd = rb_cloexec_open(fname, mode, 0)) < 0) {
+		rb_load_fail(fname_v, strerror(errno));
+	    }
 	}
 	rb_update_max_fd(fd);