Improve ex_usage() signature

Signed-off-by: Alyssa Ross <hi@alyssa.is>

1 files changed, 2 insertions, 1 deletions

diff --git a/mktuntap.c b/mktuntap.c
index a9457c6..f2995d2 100644
--- a/mktuntap.c
+++ b/mktuntap.c
@@ -7,6 +7,7 @@
 #include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <stdnoreturn.h>
 #include <string.h>
 #include <sysexits.h>
 #include <unistd.h>
@@ -44,7 +45,7 @@ int tuntap_alloc(char *dev, int open_flags, short ifr_flags_)
 	return fd;
 }
 
-void ex_usage()
+noreturn void ex_usage(void)
 {
 	fputs("mktuntap: usage: mktuntap (-n | -p) [-v] [-B] [-P] [-E] [-i ifr_name] fd prog...\n", stderr);
 	exit(EX_USAGE);