[PATCH v3 6/6] tools/libxl: Adjust datacopiers POLLHUP handling when the fd is also readable

[Ross Lagerwall <ross.lagerwall@citrix.com>]

From: Andrew Cooper <andrew.cooper3@citrix.com>

POLLHUP|POLLIN is a valid revent to receive when there is readable data in a
pipe, but the writable fd has been closed.  This occurs in migration v2 when
the legacy conversion process (which transforms the data inline) completes and
exits successfully.

In the case that there is data to read, suppress the POLLHUP.  POSIX states
that the hangup state is latched[1], which means it will reoccur on subsequent
poll() calls.  The datacopier is thus provided the opportunity to read until
EOF, if possible.

A POLLHUP on its own is treated exactly as before, indicating a different
error with the fd.

[1] http://pubs.opengroup.org/onlinepubs/9699919799/functions/poll.html

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
CC: Ian Campbell <Ian.Campbell@citrix.com>
CC: Ian Jackson <Ian.Jackson@eu.citrix.com>
CC: Wei Liu <wei.liu2@citrix.com>
---
 tools/libxl/libxl_aoutils.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/libxl/libxl_aoutils.c b/tools/libxl/libxl_aoutils.c
index a5a10fb..0d4c8af 100644
--- a/tools/libxl/libxl_aoutils.c
+++ b/tools/libxl/libxl_aoutils.c
@@ -205,6 +205,9 @@ static void datacopier_readable(libxl__egc *egc, libxl__ev_fd *ev,
     libxl__datacopier_state *dc = CONTAINER_OF(ev, *dc, toread);
     STATE_AO_GC(dc->ao);
 
+    if ((revents & (POLLHUP|POLLIN)) == (POLLHUP|POLLIN))
+        revents &= ~POLLHUP;
+
     if (datacopier_pollhup_handled(egc, dc, revents, 0))
         return;
 
-- 
2.1.0