Adding failure-command patch

README.md

@@ -26,6 +26,8 @@ slock tool, how to install it and how it works.
 
 ### Changelog:
 
+2021-09-09 - Added the failure-command patch
+
 2021-06-08 - Added the color message patch
 
 2020-08-03 - Added alpha, keypress_feedback and blur_pixelated_screen patches
@@ -64,6 +66,9 @@ slock tool, how to install it and how it works.
       - the monitor will automatically be activated by pressing a key or moving the mouse and the
         password can be entered then
 
+   - [failure-command](https://tools.suckless.org/slock/patches/failure-command/)
+      - allows for a command to be run after a specified number of incorrect attempts
+
    - [keypress_feedback](https://tools.suckless.org/slock/patches/keypress-feedback/)
       - draws random blocks on the screen to display keypress feedback
 

config.def.h

@@ -56,6 +56,15 @@ static const float alpha = 0.9;
 /* treat a cleared input like a wrong password (color) */
 static const int failonclear = 1;
 
+#if FAILURE_COMMAND_PATCH
+/* number of failed password attempts until failcommand is executed.
+   Set to 0 to disable */
+static const int failcount = 0;
+
+/* command to be executed after [failcount] failed password attempts */
+static const char *failcommand = "shutdown";
+#endif // FAILURE_COMMAND_PATCH
+
 #if BLUR_PIXELATED_SCREEN_PATCH
 /* Enable blur */
 #define BLUR

patches.def.h

@@ -60,6 +60,11 @@
  */
 #define DPMS_PATCH 0
 
+/* This patch allows for a command to be run after a specified number of incorrect attempts.
+ * https://tools.suckless.org/slock/patches/failure-command/
+ */
+#define FAILURE_COMMAND_PATCH 0
+
 /* Draws random blocks on the screen to display keypress feedback.
  * https://tools.suckless.org/slock/patches/keypress-feedback/
  * https://patch-diff.githubusercontent.com/raw/phenax/bslock/pull/2.diff

slock.c

@@ -43,6 +43,9 @@
 #include "util.h"
 
 char *argv0;
+#if FAILURE_COMMAND_PATCH
+int failtrack = 0;
+#endif // FAILURE_COMMAND_PATCH
 
 #if QUICKCANCEL_PATCH
 static time_t locktime;
@@ -272,6 +275,13 @@ readpw(Display *dpy, struct xrandr *rr, struct lock **locks, int nscreens,
 				if (running) {
 					XBell(dpy, 100);
 					failure = 1;
+					#if FAILURE_COMMAND_PATCH
+					failtrack++;
+
+					if (failtrack >= failcount && failcount != 0) {
+						system(failcommand);
+					}
+					#endif // FAILURE_COMMAND_PATCH
 				}
 				explicit_bzero(&passwd, sizeof(passwd));
 				len = 0;