From 94744ef96f4f6ab16e5637ee8f9775f8fe6aaf15 Mon Sep 17 00:00:00 2001
From: Ian Gulliver <flamingcow@gmail.com>
Date: Wed, 9 Mar 2016 18:28:46 -0800
Subject: [PATCH] Account for the possibility of stderr not being open when we
 start.

---
 adsbus/log.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/adsbus/log.c b/adsbus/log.c
index aa1554e..b3bfbf5 100644
--- a/adsbus/log.c
+++ b/adsbus/log.c
@@ -35,8 +35,10 @@ static void log_open() {
 	}
 	int fd = open(log_path, O_WRONLY | O_CREAT | O_APPEND | O_NOCTTY | O_CLOEXEC, S_IRUSR | S_IWUSR);
 	assert(fd >= 0);
-	assert(dup3(fd, STDERR_FILENO, O_CLOEXEC) == STDERR_FILENO);
-	assert(!close(fd));
+	if (fd != STDERR_FILENO) {
+		assert(dup3(fd, STDERR_FILENO, O_CLOEXEC) == STDERR_FILENO);
+		assert(!close(fd));
+	}
 }
 
 static void log_rotate() {