patch: unlock-screen (custom version)HEADmaster

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.

This is a modified version of the patch from suckless.org which allows
the user to op-into this behavior with the -u command line option.
Additionally, it is written against the dpms patch, to disable its
effects when unlock-screen is active.

1 files changed, 26 insertions, 17 deletions

diff --git a/slock.c b/slock.c
index 8393fd2..17189c7 100644
--- a/slock.c
+++ b/slock.c
@@ -231,7 +231,7 @@ readpw(Display *dpy, struct xrandr *rr, struct lock **locks, int nscreens,
 }
 
 static struct lock *
-lockscreen(Display *dpy, struct xrandr *rr, int screen)
+lockscreen(Display *dpy, struct xrandr *rr, int screen, int unlock)
 {
 	char curs[] = {0, 0, 0, 0, 0, 0, 0, 0};
 	int i, ptgrab, kbgrab;
@@ -282,7 +282,8 @@ 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 (!unlock)
+				XMapRaised(dpy, lock->win);
 			if (rr->active)
 				XRRSelectInput(dpy, lock->win, RRScreenChangeNotifyMask);
 
@@ -326,11 +327,15 @@ main(int argc, char **argv) {
 	Display *dpy;
 	int s, nlocks, nscreens;
 	CARD16 standby, suspend, off;
+	int unlock = 0;
 
 	ARGBEGIN {
 	case 'v':
 		fprintf(stderr, "slock-"VERSION"\n");
 		return 0;
+	case 'u':
+		unlock = 1;
+		break;
 	default:
 		usage();
 	} ARGEND
@@ -375,7 +380,7 @@ main(int argc, char **argv) {
 	if (!(locks = calloc(nscreens, sizeof(struct lock *))))
 		die("slock: out of memory\n");
 	for (nlocks = 0, s = 0; s < nscreens; s++) {
-		if ((locks[s] = lockscreen(dpy, &rr, s)) != NULL)
+		if ((locks[s] = lockscreen(dpy, &rr, s, unlock)) != NULL)
 			nlocks++;
 		else
 			break;
@@ -387,18 +392,20 @@ main(int argc, char **argv) {
 		return 1;
 
 	/* DPMS magic to disable the monitor */
-	if (!DPMSCapable(dpy))
-		die("slock: DPMSCapable failed\n");
-	if (!DPMSEnable(dpy))
-		die("slock: DPMSEnable failed\n");
-	if (!DPMSGetTimeouts(dpy, &standby, &suspend, &off))
-		die("slock: DPMSGetTimeouts failed\n");
-	//if (!standby || !suspend || !off)
-		//die("slock: at least one DPMS variable is zero\n");
-	if (!DPMSSetTimeouts(dpy, monitortime, monitortime, monitortime))
-		die("slock: DPMSSetTimeouts failed\n");
-
-	XSync(dpy, 0);
+	if (!unlock) {
+		if (!DPMSCapable(dpy))
+			die("slock: DPMSCapable failed\n");
+		if (!DPMSEnable(dpy))
+			die("slock: DPMSEnable failed\n");
+		if (!DPMSGetTimeouts(dpy, &standby, &suspend, &off))
+			die("slock: DPMSGetTimeouts failed\n");
+		//if (!standby || !suspend || !off)
+			//die("slock: at least one DPMS variable is zero\n");
+		if (!DPMSSetTimeouts(dpy, monitortime, monitortime, monitortime))
+			die("slock: DPMSSetTimeouts failed\n");
+
+		XSync(dpy, 0);
+	}
 
 	/* run post-lock command */
 	if (argc > 0) {
@@ -418,8 +425,10 @@ main(int argc, char **argv) {
 	readpw(dpy, &rr, locks, nscreens, hash);
 
 	/* reset DPMS values to inital ones */
-	DPMSSetTimeouts(dpy, standby, suspend, off);
-	XSync(dpy, 0);
+	if (!unlock) {
+		DPMSSetTimeouts(dpy, standby, suspend, off);
+		XSync(dpy, 0);
+	}
 
 	return 0;
 }