missing save_errno dance inside non-terminal signal handler

diff --git a/usr.bin/bgplg/misc.c b/usr.bin/bgplg/misc.c
index fc5665f..bf7f714 100644 (file)
--- a/usr.bin/bgplg/misc.c
+++ b/usr.bin/bgplg/misc.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: misc.c,v 1.8 2017/12/18 09:12:49 job Exp $    */
+/*     $OpenBSD: misc.c,v 1.9 2024/07/01 18:43:50 deraadt Exp $        */
 
 /*
  * Copyright (c) 2005, 2006 Reyk Floeter <reyk@openbsd.org>
@@ -79,10 +79,13 @@ lg_help(struct cmd *cmds, char **argv)
 void
 lg_sig_alarm(int sig)
 {
+       int save_errno = errno;
+
        if (child != -1) {
                /* Forcibly kill the child, no excuse... */
                kill(child, SIGKILL);
        }
+       errno = save_errno;
 }
 
 int