From efd523764efcd39340fb62875716c8c8b79f0de9 Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Fri, 9 Feb 2018 22:38:46 +0100
Subject: [PATCH] sd-journal: make sure it's safe to call sd_journal_process()
 before the first sd_journal_wait()
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In that case we have no inotify fd yet, and there's nothing to process
hence. Let's make the call a NOP.

(Previously, without this change we'd end up trying to read off inotify
fd -1, which is quite a problem... 😢)

(cherry picked from commit 10c4d6405f74258ea4fac5db4888c1bf49ad5399)

Related: #1540538
---
 src/journal/sd-journal.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/journal/sd-journal.c b/src/journal/sd-journal.c
index 9186f5188e..e1cde6e1c2 100644
--- a/src/journal/sd-journal.c
+++ b/src/journal/sd-journal.c
@@ -2329,6 +2329,9 @@ _public_ int sd_journal_process(sd_journal *j) {
         assert_return(j, -EINVAL);
         assert_return(!journal_pid_changed(j), -ECHILD);
 
+        if (j->inotify_fd < 0) /* We have no inotify fd yet? Then there's noting to process. */
+                return 0;
+
         j->last_process_usec = now(CLOCK_MONOTONIC);
         j->last_invalidate_counter = j->current_invalidate_counter;