https://git.ruby-lang.org/ruby.git/commit/?id=50f1468bfd

From 50f1468bfd11eb2ea54c2d6bea958f44eb2db33c Mon Sep 17 00:00:00 2001
From: Yuta Saito <kateinoigakukun@g...>
Date: Wed, 15 Dec 2021 15:49:59 +0900
Subject: [wasm] include/ruby/io.h: define RB_WAITFD_PRI by ourselves for wasi

RB_WAITFD_PRI uses POLLPRI for other platforms, but wasi-libc doesn't
have POLLPRI for now.
---
 include/ruby/io.h | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/include/ruby/io.h b/include/ruby/io.h
index 3e035c114d7..6ecf4053668 100644
--- a/include/ruby/io.h
+++ b/include/ruby/io.h
@@ -35,7 +35,12 @@ https://github.com/ruby/ruby/blob/trunk/include/ruby/io.h#L35
 #    undef revents
 #  endif
 #  define RB_WAITFD_IN  POLLIN
-#  define RB_WAITFD_PRI POLLPRI
+#  if defined(__wasi__) && !defined(POLLPRI)
+//   wasi-libc doesn't have POLLPRI and 0x002 is already reserved for POLLOUT, so use 0x003
+#    define RB_WAITFD_PRI 0x003
+#  else
+#    define RB_WAITFD_PRI POLLPRI
+#  endif
 #  define RB_WAITFD_OUT POLLOUT
 #else
 #  define RB_WAITFD_IN  0x001
-- 
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