From e093317ded6ea3543ebd2f8aabd2d2b2b7fc21f0 Mon Sep 17 00:00:00 2001
From: Laurent Bercot <ska-skaware@skarnet.org>
Date: Thu, 17 Feb 2022 11:34:31 +0000
Subject:  Full errno paranoia in selfpipe signal handler

Signed-off-by: Laurent Bercot <ska@appnovation.com>
---
 src/libstddjb/selfpipe_internal.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/libstddjb/selfpipe_internal.c b/src/libstddjb/selfpipe_internal.c
index 34bdd51..45063bc 100644
--- a/src/libstddjb/selfpipe_internal.c
+++ b/src/libstddjb/selfpipe_internal.c
@@ -16,6 +16,7 @@ int selfpipe_fd = -1 ;
 #else
 
 #include <unistd.h>
+#include <errno.h>
 
 #include <skalibs/allreadwrite.h>
 
@@ -23,8 +24,10 @@ int selfpipe[2] = { -1, -1 } ;
 
 void selfpipe_tophalf (int s)
 {
+  int e = errno ;
   unsigned char c = (unsigned char)s ;
   write(selfpipe[1], (char *)&c, 1) ;
+  errno = e ;
 }
 
 #endif
-- 
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