68 lines
1.1 KiB
C
68 lines
1.1 KiB
C
/* See LICENSE file for copyright and license details. */
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#include <sys/ioctl.h>
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#include <sys/types.h>
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#include <fcntl.h>
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#include <limits.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 KDGKBTYPE 0x4B33 /* get keyboard type */
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#define VT_ACTIVATE 0x5606 /* make vt active */
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#define VT_WAITACTIVE 0x5607 /* wait for vt active */
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static char *vt[] = {
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"/proc/self/fd/0",
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"/dev/console",
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"/dev/tty",
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"/dev/tty0",
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};
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static void
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usage(void)
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{
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eprintf("usage: %s num\n", argv0);
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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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unsigned int n, i;
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int fd;
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char c;
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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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n = estrtonum(argv[0], 0, UINT_MAX);
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for (i = 0; i < LEN(vt); i++) {
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if ((fd = open(vt[i], O_RDONLY)) < 0)
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continue;
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c = 0;
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if (ioctl(fd, KDGKBTYPE, &c) == 0)
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goto found;
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if (close(fd) < 0)
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eprintf("close %s:", vt[i]);
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}
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eprintf("no console found\n");
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found:
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if (ioctl(fd, VT_ACTIVATE, n) == -1)
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eprintf("VT_ACTIVATE %u:", n);
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if (ioctl(fd, VT_WAITACTIVE, n) == -1)
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eprintf("VT_WAITACTIVE %u:", n);
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if (close(fd) < 0)
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eprintf("close %s:", vt[i]);
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return 0;
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}
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