Ensure errno is valid when returning from lxcContainerWaitForContinue

Only some of the return paths of lxcContainerWaitForContinue will
have set errno. In other paths we need to set it manually to avoid
the caller getting a random stale errno value

* src/lxc/lxc_container.c: Set errno in lxcContainerWaitForContinue

diff --git a/src/lxc/lxc_container.c b/src/lxc/lxc_container.c
index 06ccf7e2dbb22d1f32ce27083a24c6fa1e751ce2..7a3589b5f8bf0e9c451351b818ada94183485c50 100644 (file)
--- a/src/lxc/lxc_container.c
+++ b/src/lxc/lxc_container.c
@@ -224,8 +224,13 @@ int lxcContainerWaitForContinue(int control)
     int readLen;
 
     readLen = saferead(control, &msg, sizeof(msg));
-    if (readLen != sizeof(msg) ||
-        msg != LXC_CONTINUE_MSG) {
+    if (readLen != sizeof(msg)) {
+        if (readLen >= 0)
+            errno = EIO;
+        return -1;
+    }
+    if (msg != LXC_CONTINUE_MSG) {
+        errno = EINVAL;
         return -1;
     }