From 23e4c95c1c777ed0a42b5130ac35eb13ac0333ef Mon Sep 17 00:00:00 2001
From: Arseny Smirnov <arseny30@gmail.com>
Date: Sat, 22 Sep 2018 17:13:49 +0300
Subject: [PATCH] Fix EventFdLinux

GitOrigin-RevId: 15b9fe88f5df8489c837d75fe3705a01298e902a
---
 tdutils/td/utils/port/detail/EventFdLinux.cpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/tdutils/td/utils/port/detail/EventFdLinux.cpp b/tdutils/td/utils/port/detail/EventFdLinux.cpp
index e34b78bbb..9fe37eec2 100644
--- a/tdutils/td/utils/port/detail/EventFdLinux.cpp
+++ b/tdutils/td/utils/port/detail/EventFdLinux.cpp
@@ -81,6 +81,12 @@ void EventFdLinux::release() {
 }
 
 void EventFdLinux::acquire() {
+  impl_->info.get_flags();
+  SCOPE_EXIT {
+    // Clear flags without EAGAIN and EWOULDBLOCK
+    // Looks like it is safe thing to do with eventfd
+    get_poll_info().clear_flags(PollFlags::Read());
+  };
   uint64 res;
   auto slice = MutableSlice(reinterpret_cast<char *>(&res), sizeof(res));
   auto native_fd = impl_->info.native_fd().fd();
@@ -97,7 +103,6 @@ void EventFdLinux::acquire() {
         || read_errno == EWOULDBLOCK
 #endif
     ) {
-      get_poll_info().clear_flags(PollFlags::Read());
       return 0;
     }
     return Status::PosixError(read_errno, PSLICE() << "Read from fd " << native_fd << " has failed");