From d5e52bc81e7ed81227fb7d96e236db318400cb75 Mon Sep 17 00:00:00 2001
From: Andreas Franek <itfranek@gmail.com>
Date: Sun, 9 Jan 2022 22:31:07 +0100
Subject: [PATCH] pigpio.c: reset errno after existance check (#509)

---
 pigpio.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/pigpio.c b/pigpio.c
index 4c49d44..e3f04e4 100644
--- a/pigpio.c
+++ b/pigpio.c
@@ -7299,6 +7299,8 @@ static void initCheckLockFile(void)
    char str[20];
 
    fd = open(PI_LOCKFILE, O_RDONLY);
+   if(errno == ENOENT)
+      errno = 0; // reset if expected error occured
 
    if (fd != -1)
    {