From 5e6eb8dd01f473fb0356353ef8b5a5e271613561 Mon Sep 17 00:00:00 2001
From: topjohnwu <topjohnwu@gmail.com>
Date: Mon, 30 May 2022 01:21:38 -0700
Subject: [PATCH] Avoid non-blocking I/O

---
 native/jni/su/connect.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/native/jni/su/connect.cpp b/native/jni/su/connect.cpp
index 3521037cc..ea1d19cab 100644
--- a/native/jni/su/connect.cpp
+++ b/native/jni/su/connect.cpp
@@ -217,7 +217,8 @@ int app_request(const su_context &ctx) {
     exec_cmd("request", extras, ctx.info, false);
 
     // Wait for data input for at most 70 seconds
-    int fd = xopen(fifo, O_RDONLY | O_CLOEXEC | O_NONBLOCK);
+    // Open with O_RDWR to prevent FIFO open block
+    int fd = xopen(fifo, O_RDWR | O_CLOEXEC);
     struct pollfd pfd = {
         .fd = fd,
         .events = POLLIN