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-rw-r--r--ext/fcntl/fcntl.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/ext/fcntl/fcntl.c b/ext/fcntl/fcntl.c
index de0b284b36..ca7b12bde1 100644
--- a/ext/fcntl/fcntl.c
+++ b/ext/fcntl/fcntl.c
@@ -104,4 +104,9 @@ Init_fcntl()
#ifdef O_WRONLY
rb_define_const(mFcntl, "O_WRONLY", INT2NUM(O_WRONLY));
#endif
+#ifdef O_ACCMODE
+ rb_define_const(mFcntl, "ACCMODE", INT2FIX(O_ACCMODE));
+#else
+ rb_define_const(mFcntl, "ACCMODE", INT2FIX(O_RDONLY | O_WRONLY | O_RDWR));
+#endif
}