sync: fail on unexpected message sizes

I think (?) this may be related to our hanging monitor bug. Let's do this anyway, as it's probably a good idea. Signed-off-by: Tycho Andersen <tycho.andersen@canonical.com>

sync: fail on unexpected message sizes
f55f607d · Tycho Andersen · Stéphane Graber · 3fb82baf · f55f607d
Commit f55f607d authored May 06, 2016 by Tycho Andersen Committed by Stéphane Graber May 11, 2016
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sync.c src/lxc/sync.c +5 -0

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--- a/src/lxc/sync.c
+++ b/src/lxc/sync.c
@@ -47,6 +47,11 @@ static int __sync_wait(int fd, int sequence)
 	if (!ret)
 		return 0;

+	if (ret != sizeof(sync)) {
+		ERROR("unexpected sync size: %d expected %lu", ret, sizeof(sync));
+		return -1;
+	}
+
 	if (sync == LXC_SYNC_ERROR) {
 		ERROR("An error occurred in another process "
 		      "(expected sequence number %d)", sequence);