[hackers] [slock][PATCH] Lock input, hide mouse, don't lock screen (-u)

From: cat <cat_AT_plan9.rocks>
Date: Thu, 30 Oct 2025 12:05:30 +0000

This patch keeps the screen unlocked but keeps the input locked.
That is, the screen is not affected by slock, but users will not
be able to interact with the X session unless they enter the correct
password.

Unlike the "Unlock Screen" patch, this uses an arg (-u) to enable the
unlocked screen functionality, and the mouse will remain hidden. The
primary use case for this would be in a script to spawn a screensaver
when the screen is locked. AFAIK the existing arg parsing system does
not support continuing execution if a flag is set, so sorry for the
messy arg handling.

---
 slock.c | 26 +++++++++++++++++---------
 1 file changed, 17 insertions(+), 9 deletions(-)
diff --git a/slock.c b/slock.c
index b5a9b04..1cd4995 100644
--- a/slock.c
+++ b/slock.c
_AT_@ -9,6 +9,7 @@
 #include <grp.h>
 #include <pwd.h>
 #include <stdarg.h>
+#include <stdbool.h>
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
_AT_@ -45,6 +46,8 @@ struct xrandr {
 	int errbase;
 };
 
+bool visual_unlock = false;
+
 #include "config.h"
 
 static void
_AT_@ -272,7 +275,8 @@ lockscreen(Display *dpy, struct xrandr *rr, int screen)
 
 		/* input is grabbed: we can lock the screen */
 		if (ptgrab == GrabSuccess && kbgrab == GrabSuccess) {
-			XMapRaised(dpy, lock->win);
+			if (!visual_unlock)
+				XMapRaised(dpy, lock->win);
 			if (rr->active)
 				XRRSelectInput(dpy, lock->win, RRScreenChangeNotifyMask);
 
_AT_@ -301,7 +305,7 @@ lockscreen(Display *dpy, struct xrandr *rr, int screen)
 static void
 usage(void)
 {
-	die("usage: slock [-v] [cmd [arg ...]]\n");
+	die("usage: slock [-u] [-v] [cmd [arg ...]]\n");
 }
 
 int
_AT_@ -316,13 +320,17 @@ main(int argc, char **argv) {
 	Display *dpy;
 	int s, nlocks, nscreens;
 
-	ARGBEGIN {
-	case 'v':
-		puts("slock-"VERSION);
-		return 0;
-	default:
-		usage();
-	} ARGEND
+	if (argc > 1 && strcmp(argv[1], "-u") == 0) {
+		visual_unlock = true;
+	} else {
+		ARGBEGIN {
+		case 'v':
+			puts("slock-"VERSION);
+			return 0;
+		default:
+			usage();
+		} ARGEND
+	}
 
 	/* validate drop-user and -group */
 	errno = 0;
-- 
2.51.0

Received on Thu Oct 30 2025 - 13:05:30 CET