X-Git-Url: https://git.danieliu.xyz/?p=slock.git;a=blobdiff_plain;f=slock.c;h=c9cdee20581b9b9731c35ef8b9fadcfc34ff3eb0;hp=2aa395e294690b843beb8fb870a5c083a66f4e01;hb=65b8d5278882310eed758e6fbfd6ab9676db883c;hpb=ec46680fe10ffc69007b0a8b29d9e69c72704053

diff --git a/slock.c b/slock.c
index 2aa395e..c9cdee2 100644
--- a/slock.c
+++ b/slock.c
@@ -273,15 +273,28 @@ lockscreen(Display *dpy, int screen)
 	return NULL;
 }
 
-int
-main(int argc, char **argv)
+static void
+usage(void)
 {
+	fprintf(stderr, "usage: slock [-v|POST_LOCK_CMD]\n");
+	exit(1);
+}
+
+int
+main(int argc, char **argv) {
 #ifndef HAVE_BSD_AUTH
 	const char *pws;
 #endif
 	Display *dpy;
 	int screen;
 
+	if ((argc >= 2) && !strcmp("-v", argv[1]))
+		die("version %s, © 2006-2016 slock engineers\n", VERSION);
+
+	/* treat first argument starting with a '-' as option */
+	if ((argc >= 2) && argv[1][0] == '-')
+		usage();
+
 #ifdef __linux__
 	dontkillme();
 #endif