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	vtallow.c - ubase - suckless linux base utils
	git clone git://git.suckless.org/ubase
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	---
	vtallow.c (901B)
	---
	1 /* See LICENSE file for copyright and license details. */
	2 #include <sys/types.h>
	3 #include <sys/stat.h>
	4 #include <sys/ioctl.h>
	5
	6 #include <fcntl.h>
	7 #include <stdio.h>
	8 #include <string.h>
	9 #include <unistd.h>
	10
	11 #include "util.h"
	12
	13 #define CONSOLE "/dev/console"
	14
	15 #define VT_LOCKSWITCH 0x560B /* disallow vt switching */
	16 #define VT_UNLOCKSWITCH 0x560C /* allow vt switching */
	17
	18 static void
	19 usage(void)
	20 {
	21 eprintf("usage: %s n \| y\n", argv0);
	22 }
	23
	24 int
	25 main(int argc, char *argv[])
	26 {
	27 int fd;
	28 int allow;
	29
	30 ARGBEGIN {
	31 default:
	32 usage();
	33 } ARGEND;
	34
	35 if (argc != 1)
	36 usage();
	37
	38 if (!strcmp(argv[0], "y"))
	39 allow = 1;
	40 else if (!strcmp(argv[0], "n"))
	41 allow = 0;
	42 else
	43 usage();
	44
	45 if ((fd = open(CONSOLE, O_WRONLY)) < 0)
	46 eprintf("open %s:", CONSOLE);
	47 if (ioctl(fd, allow ? VT_UNLOCKSWITCH : VT_LOCKSWITCH) < 0)
	48 eprintf("cannot %s VT switch:",
	49 allow ? "unlock" : "lock");
	50 close(fd);
	51 return 0;
	52 }