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diff --git c/config.def.h w/config.def.h
index 7ee7f9d..176294a 100644
--- c/config.def.h
+++ w/config.def.h
@@ -21,6 +21,9 @@ static const char *colors[][3] = {
/* tagging */
static const char *tags[] = { "1", "2", "3", "4", "5", "6", "7", "8", "9" };
+/* Lockfile */
+static char lockfile[] = "/tmp/dwm.lock";
+
static const Rule rules[] = {
/* xprop(1):
* WM_CLASS(STRING) = instance, class
diff --git c/dwm.c w/dwm.c
index b1c07e8..55925bd 100644
--- c/dwm.c
+++ w/dwm.c
@@ -27,6 +27,7 @@
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
+#include <time.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
@@ -1262,7 +1263,24 @@ propertynotify(XEvent *e)
void
quit(const Arg *arg)
{
- running = 0;
+ FILE *fd = NULL;
+ struct stat filestat;
+
+ if ((fd = fopen(lockfile, "r")) && stat(lockfile, &filestat) == 0) {
+ fclose(fd);
+
+ if (filestat.st_ctime <= time(NULL)-2)
+ remove(lockfile);
+ }
+
+ if ((fd = fopen(lockfile, "r")) != NULL) {
+ fclose(fd);
+ remove(lockfile);
+ running = 0;
+ } else {
+ if ((fd = fopen(lockfile, "a")) != NULL)
+ fclose(fd);
+ }
}
Monitor *
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