From 0eafe8bcd92e49f7d037228526d0e6fcdc388621 Mon Sep 17 00:00:00 2001
From: Joachim Nilsson <troglobit@gmail.com>
Date: Wed, 10 Aug 2016 21:39:09 +0200
Subject: [PATCH] initctl: Show error message when trying to signal PID 1 as
 non-root

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>
---
 initctl.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/initctl.c b/initctl.c
index f1d054d9..8ef97712 100644
--- a/initctl.c
+++ b/initctl.c
@@ -21,6 +21,7 @@
  * THE SOFTWARE.
  */
 
+#include <err.h>
 #include <ctype.h>
 #include <getopt.h>
 #include <glob.h>
@@ -278,9 +279,17 @@ static int do_cond(char *cmd)
 	return do_cond_show(NULL);
 }
 
-static int do_halt    (char *UNUSED(arg)) { return kill(1, SIGUSR1); }
-static int do_poweroff(char *UNUSED(arg)) { return kill(1, SIGUSR2); }
-static int do_reboot  (char *UNUSED(arg)) { return kill(1, SIGTERM); }
+static int do_signal(int signo, const char *msg)
+{
+	if (kill(1, signo))
+		err(1, "Failed signalling init to %s", msg);
+
+	return 0;
+}
+
+static int do_halt    (char *UNUSED(arg)) { return do_signal(SIGUSR1, "halt");      }
+static int do_poweroff(char *UNUSED(arg)) { return do_signal(SIGUSR2, "power off"); }
+static int do_reboot  (char *UNUSED(arg)) { return do_signal(SIGTERM, "reboot");    }
 
 static int do_utmp(char *UNUSED(cmd))
 {