* io.c (rb_io_initialize): should check fcntl result. [ruby-dev:23742]

git-svn-id: http://svn.ruby-lang.org/repos/ruby/trunk@6497 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 0 deletions

diff --git a/io.c b/io.c
index 52b4cfb05..d26aaaf1c 100644
--- a/io.c
+++ b/io.c
@@ -3851,6 +3851,7 @@ rb_io_initialize(argc, argv, io)
     else if (!ofp) {
 #if defined(HAVE_FCNTL) && defined(F_GETFL)
 	flags = fcntl(fd, F_GETFL);
+	if (flags == -1) rb_sys_fail(0);
 #else
 	flags = O_RDONLY;
 #endif