59 lines
1.0 KiB
C
59 lines
1.0 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#include <sys/ioctl.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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char *vts[] = {
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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: chvt N\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 n, i, fd;
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char c;
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if(argc!=2 || strspn(argv[1], "1234567890") != strlen(argv[1]))
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usage();
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n = atoi(argv[1]);
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for(i = 0; i < LEN(vts); i++) {
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fd = open(vts[i], O_RDONLY);
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if(fd < 1)
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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 VTfound;
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close(fd);
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}
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eprintf("chvt: couldn't find a console.\n");
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VTfound:
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if(ioctl(fd, VT_ACTIVATE, n) == -1)
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eprintf("chvt: VT_ACTIVATE '%d':", n);
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if(ioctl(fd, VT_WAITACTIVE, n) == -1)
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eprintf("chvt: VT_WAITACTIVE '%d':", n);
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close(fd);
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return 0;
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}
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