From f2f21f4f7a5f0fdf43fa957f0628045ed373a025 Mon Sep 17 00:00:00 2001
From: Nikolay Shirokovskiy <nshirokovskiy@virtuozzo.com>
Date: Thu, 24 Sep 2020 15:47:09 +0300
Subject: [PATCH 036/108] logging: read all bytes on EOF in event handler

If writing side writes enough bytes to the pipe and closes writing
end then we got both VIR_EVENT_HANDLE_HANGUP and VIR_EVENT_HANDLE_READ
in handler. Currently in this situation handler reads 1024 bytes
and finish reading leaving unread data in pipe.

Signed-off-by: Nikolay Shirokovskiy <nshirokovskiy@virtuozzo.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
(cherry picked from commit 7c0e1a8631773788a96702252931541290288ef6)
---
 src/logging/log_handler.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/src/logging/log_handler.c b/src/logging/log_handler.c
index 3cc197a396..00fca7b653 100644
--- a/src/logging/log_handler.c
+++ b/src/logging/log_handler.c
@@ -138,7 +138,7 @@ virLogHandlerGetLogFileFromWatch(virLogHandlerPtr handler,
 static void
 virLogHandlerDomainLogFileEvent(int watch,
                                 int fd,
-                                int events,
+                                int events G_GNUC_UNUSED,
                                 void *opaque)
 {
     virLogHandlerPtr handler = opaque;
@@ -168,14 +168,13 @@ virLogHandlerDomainLogFileEvent(int watch,
         virReportSystemError(errno, "%s",
                              _("Unable to read from log pipe"));
         goto error;
+    } else if (len == 0) {
+        goto error;
     }
 
     if (virRotatingFileWriterAppend(logfile->file, buf, len) != len)
         goto error;
 
-    if (events & VIR_EVENT_HANDLE_HANGUP)
-        goto error;
-
  cleanup:
     virObjectUnlock(handler);
     return;
-- 
2.33.0