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-rw-r--r--slock.c17
1 files changed, 15 insertions, 2 deletions
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