ghedo · July 5, 2020 10:21 · Jan 13, 2013 · Nov 20, 2012 · Nov 20, 2012
diff --git a/sleepd.c b/sleepd.c
@@ -15,7 +15,7 @@
  * then create the group "input" and add your user to it. Be aware that this
  * may have security implications, particularly on shared boxes.
  *
- * Copyright (C) 2012 Alessandro Ghedini <[email protected]>
+ * Copyright (C) 2012 Alessandro Ghedini <[email protected]>
  * --------------------------------------------------------------
  * "THE BEER-WARE LICENSE" (Revision 42):
  * Alessandro Ghedini wrote this file. As long as you retain this

diff --git a/sleepd.c b/sleepd.c
@@ -1,6 +1,12 @@
 /*
  * Execute a command after some time of inactivity
  *
+ * Compile:
+ * $ cc -o sleepd sleepd.c
+ *
+ * Usage:
+ * $ ./sleepd -t 600 -c "slock"
+ *
  * NOTE: to run this as a normal (non-root) user you may need to change
  * /dev/input/event* devices permissions, e.g. using udev:
  *
@@ -9,12 +15,6 @@
  * then create the group "input" and add your user to it. Be aware that this
  * may have security implications, particularly on shared boxes.
  *
- * Compile:
- * $ cc -o sleepd sleepd.c
- *
- * Usage:
- * $ ./sleepd -t 600 -c "slock"
- *
  * Copyright (C) 2012 Alessandro Ghedini <[email protected]>
  * --------------------------------------------------------------
  * "THE BEER-WARE LICENSE" (Revision 42):
@@ -127,4 +127,4 @@ int main(int argc, char *argv[]) {
 	}
 
 	return 0;
-}
+}
diff --git a/sleepd.c b/sleepd.c
@@ -0,0 +1,130 @@
+/*
+ * Execute a command after some time of inactivity
+ *
+ * NOTE: to run this as a normal (non-root) user you may need to change
+ * /dev/input/event* devices permissions, e.g. using udev:
+ *
+ *   KERNEL=="event*", NAME="input/%k", MODE="644", GROUP="input"
+ *
+ * then create the group "input" and add your user to it. Be aware that this
+ * may have security implications, particularly on shared boxes.
+ *
+ * Compile:
+ * $ cc -o sleepd sleepd.c
+ *
+ * Usage:
+ * $ ./sleepd -t 600 -c "slock"
+ *
+ * Copyright (C) 2012 Alessandro Ghedini <[email protected]>
+ * --------------------------------------------------------------
+ * "THE BEER-WARE LICENSE" (Revision 42):
+ * Alessandro Ghedini wrote this file. As long as you retain this
+ * notice you can do whatever you want with this stuff. If we
+ * meet some day, and you think this stuff is worth it, you can
+ * buy me a beer in return.
+ * --------------------------------------------------------------
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <fcntl.h>
+#include <getopt.h>
+#include <unistd.h>
+
+#include <sys/select.h>
+#include <sys/types.h>
+
+fd_set ev;
+int devs[128];
+
+void init_ev() {
+	int i = 0;
+
+	FD_ZERO(&ev);
+
+	do {
+		int fd;
+		char dev_name[128];
+
+		snprintf(dev_name, 127, "/dev/input/event%d", i++);
+		fd = open(dev_name, O_RDONLY);
+
+		if (fd < 0) break;
+
+		devs[i] = fd;
+		FD_SET(fd, &ev);
+	} while (1);
+}
+
+void clean_ev() {
+	int i;
+
+	for (i = 0; i < 128; i++)
+		close(devs[i]);
+}
+
+void usage(char *name) {
+	fprintf(stderr, "Usage: %s -t <timeout> -c <command>\n", name);
+	exit(-1);
+}
+
+int main(int argc, char *argv[]) {
+	char *cmd = NULL;
+	int opt, timeout = 0, enabled = 1;
+
+	struct timeval tv;
+
+	while ((opt = getopt(argc, argv, "c:t:")) != -1) {
+		switch (opt) {
+			case 'c':
+				cmd = strdup(optarg);
+				break;
+			case 't':
+				timeout = atoi(optarg);
+				break;
+			default:
+				usage(argv[0]);
+		}
+	}
+
+	if ((timeout == 0) || (cmd == NULL))
+		usage(argv[0]);
+
+	while (1) {
+		int rc;
+
+		init_ev();
+
+		tv.tv_sec  = timeout;
+		tv.tv_usec = 0;
+
+		rc = select(FD_SETSIZE, &ev, NULL, NULL, &tv);
+
+		switch (rc) {
+			case -1: {
+				perror("sleepd");
+				return -1;
+			}
+
+			case  0: {
+				if (enabled) {
+					enabled = 0;
+					system(cmd);
+				}
+
+				break;
+			}
+
+			default: {
+				enabled = 1;
+				break;
+			}
+		}
+
+		clean_ev();
+	}
+
+	return 0;
+}