From: Po Lu <luangruo@yahoo.com>
Date: Fri, 19 Jan 2024 12:51:24 +0000 (+0800)
Subject: Fix another cause of superfluous inotify signals on Android
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=c4b570f48921929974c3bbc79660127e68ac8bf0;p=emacs.git

Fix another cause of superfluous inotify signals on Android

* src/android.c (android_select): If the event queue isn't
empty upon the initial check, clear all fdsets.

(cherry picked from commit bd5bfc29137b6e452e1900a1fc3cf09e77959133)
---

diff --git a/src/android.c b/src/android.c
index 757f256c188..fb7703d84ab 100644
--- a/src/android.c
+++ b/src/android.c
@@ -744,6 +744,19 @@ android_select (int nfds, fd_set *readfds, fd_set *writefds,
 
   if (event_queue.num_events)
     {
+      /* Zero READFDS, WRITEFDS and EXCEPTFDS, lest the caller
+	 mistakenly interpret this return value as indicating that an
+	 inotify file descriptor is readable, and try to poll an
+	 unready one.  */
+
+      if (readfds)
+	FD_ZERO (readfds);
+
+      if (writefds)
+	FD_ZERO (writefds);
+
+      if (exceptfds)
+	FD_ZERO (exceptfds);
       pthread_mutex_unlock (&event_queue.mutex);
       return 1;
     }