Add vtallow(1) to enable or disable VT switch - ubase - suckless linux base utils
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---
DIR commit 4269d523e2c5cc65c89e5340a55febe72c3d3f49
DIR parent 74c0abb6a2f9b8cac0653f1b96646aaf74b91a68
HTML Author: sin <sin@2f30.org>
Date: Fri, 5 Dec 2014 15:04:37 +0000
Add vtallow(1) to enable or disable VT switch
Diffstat:
M Makefile | 1 +
A vtallow.c | 52 +++++++++++++++++++++++++++++++
2 files changed, 53 insertions(+), 0 deletions(-)
---
DIR diff --git a/Makefile b/Makefile
@@ -82,6 +82,7 @@ BIN = \
umount \
unshare \
uptime \
+ vtallow \
watch \
who
DIR diff --git a/vtallow.c b/vtallow.c
@@ -0,0 +1,52 @@
+/* See LICENSE file for copyright and license details. */
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+
+#include <fcntl.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "util.h"
+
+#define CONSOLE "/dev/console"
+
+#define VT_LOCKSWITCH 0x560B /* disallow vt switching */
+#define VT_UNLOCKSWITCH 0x560C /* allow vt switching */
+
+static void
+usage(void)
+{
+ eprintf("usage: vtallow n|y\n");
+}
+
+int
+main(int argc, char *argv[])
+{
+ int fd;
+ int allow;
+
+ ARGBEGIN {
+ default:
+ usage();
+ } ARGEND;
+
+ if (argc != 1)
+ usage();
+
+ if (!strcmp(argv[0], "y"))
+ allow = 1;
+ else if (!strcmp(argv[0], "n"))
+ allow = 0;
+ else
+ usage();
+
+ if ((fd = open(CONSOLE, O_WRONLY)) < 0)
+ eprintf("open %s:", CONSOLE);
+ if (ioctl(fd, allow ? VT_UNLOCKSWITCH : VT_LOCKSWITCH) < 0)
+ eprintf("cannot %s VT switch:",
+ allow ? "enable" : "disable");
+ close(fd);
+ return 0;
+}