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	Add vtallow(1) to enable or disable VT switch - ubase - suckless linux base uti…
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	---
	commit 4269d523e2c5cc65c89e5340a55febe72c3d3f49
	parent 74c0abb6a2f9b8cac0653f1b96646aaf74b91a68
	Author: sin <[email protected]>
	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(-)
	---
	diff --git a/Makefile b/Makefile
	@@ -82,6 +82,7 @@ BIN = \
	umount \
	unshare \
	uptime \
	+ vtallow \
	watch \
	who

	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;
	+}