53 lines
899 B
C
53 lines
899 B
C
/* See LICENSE file for copyright and license details. */
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/ioctl.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include "util.h"
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#define CONSOLE "/dev/console"
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#define VT_LOCKSWITCH 0x560B /* disallow vt switching */
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#define VT_UNLOCKSWITCH 0x560C /* allow vt switching */
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static void
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usage(void)
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{
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eprintf("usage: vtallow n | y\n");
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}
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int
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main(int argc, char *argv[])
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{
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int fd;
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int allow;
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ARGBEGIN {
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default:
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usage();
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} ARGEND;
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if (argc != 1)
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usage();
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if (!strcmp(argv[0], "y"))
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allow = 1;
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else if (!strcmp(argv[0], "n"))
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allow = 0;
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else
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usage();
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if ((fd = open(CONSOLE, O_WRONLY)) < 0)
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eprintf("open %s:", CONSOLE);
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if (ioctl(fd, allow ? VT_UNLOCKSWITCH : VT_LOCKSWITCH) < 0)
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eprintf("cannot %s VT switch:",
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allow ? "unlock" : "lock");
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close(fd);
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return 0;
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}
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