From 62a4a4bca549ee6020aec90e540ce393a34c5605 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= <zbyszek@in.waw.pl>
Date: Thu, 29 Sep 2016 16:06:02 +0200
Subject: [PATCH] pid1: process zero-length notification messages again

This undoes 531ac2b234. I acked that patch without looking at the code
carefully enough. There are two problems:
- we want to process the fds anyway
- in principle empty notification messages are valid, and we should
  process them as usual, including logging using log_unit_debug().

(cherry picked from commit 8523bf7dd514a3a2c6114b7b8fb8f308b4f09fc4)
(cherry picked from commit 9d77c48a80e1cc2ad016eba1756a5ca293d51f86)
---
 src/core/manager.c | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/src/core/manager.c b/src/core/manager.c
index 5092b1c5f6..369ed546b4 100644
--- a/src/core/manager.c
+++ b/src/core/manager.c
@@ -1493,13 +1493,12 @@ static unsigned manager_dispatch_dbus_queue(Manager *m) {
         return n;
 }
 
-static void manager_invoke_notify_message(Manager *m, Unit *u, pid_t pid, const char *buf, size_t n, FDSet *fds) {
+static void manager_invoke_notify_message(Manager *m, Unit *u, pid_t pid, const char *buf, FDSet *fds) {
         _cleanup_strv_free_ char **tags = NULL;
 
         assert(m);
         assert(u);
         assert(buf);
-        assert(n > 0);
 
         tags = strv_split(buf, "\n\r");
         if (!tags) {
@@ -1561,10 +1560,6 @@ static int manager_dispatch_notify_fd(sd_event_source *source, int fd, uint32_t
                  * example... */
                 return 0;
         }
-        if (n == 0) {
-                log_debug("Got zero-length notification message. Ignoring.");
-                return 0;
-        }
 
         CMSG_FOREACH(cmsg, &msghdr) {
                 if (cmsg->cmsg_level == SOL_SOCKET && cmsg->cmsg_type == SCM_RIGHTS) {
@@ -1607,19 +1602,19 @@ static int manager_dispatch_notify_fd(sd_event_source *source, int fd, uint32_t
          * to avoid notifying the same one multiple times. */
         u1 = manager_get_unit_by_pid_cgroup(m, ucred->pid);
         if (u1) {
-                manager_invoke_notify_message(m, u1, ucred->pid, buf, n, fds);
+                manager_invoke_notify_message(m, u1, ucred->pid, buf, fds);
                 found = true;
         }
 
         u2 = hashmap_get(m->watch_pids1, PID_TO_PTR(ucred->pid));
         if (u2 && u2 != u1) {
-                manager_invoke_notify_message(m, u2, ucred->pid, buf, n, fds);
+                manager_invoke_notify_message(m, u2, ucred->pid, buf, fds);
                 found = true;
         }
 
         u3 = hashmap_get(m->watch_pids2, PID_TO_PTR(ucred->pid));
         if (u3 && u3 != u2 && u3 != u1) {
-                manager_invoke_notify_message(m, u3, ucred->pid, buf, n, fds);
+                manager_invoke_notify_message(m, u3, ucred->pid, buf, fds);
                 found = true;
         }