morpheus-base

morpheus base system
git clone git://git.2f30.org/morpheus-base.git
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chvt.c (1099B)


      1 /* See LICENSE file for copyright and license details. */
      2 #include <sys/ioctl.h>
      3 #include <sys/types.h>
      4 
      5 #include <fcntl.h>
      6 #include <stdio.h>
      7 #include <stdlib.h>
      8 #include <string.h>
      9 #include <unistd.h>
     10 
     11 #include "util.h"
     12 
     13 #define KDGKBTYPE	0x4B33	/* get keyboard type */
     14 
     15 #define VT_ACTIVATE	0x5606	/* make vt active */
     16 #define VT_WAITACTIVE	0x5607	/* wait for vt active */
     17 
     18 static char *vts[] = {
     19 	"/proc/self/fd/0",
     20 	"/dev/console",
     21 	"/dev/tty",
     22 	"/dev/tty0",
     23 };
     24 
     25 static void
     26 usage(void)
     27 {
     28 	eprintf("usage: chvt N\n");
     29 }
     30 
     31 int
     32 main(int argc, char *argv[])
     33 {
     34 	unsigned int n, i;
     35 	int fd;
     36 	char c;
     37 
     38 	if (argc != 2 || strspn(argv[1], "1234567890") != strlen(argv[1]))
     39 		usage();
     40 
     41 	n = estrtol(argv[1], 10);
     42 	for (i = 0; i < LEN(vts); i++) {
     43 		fd = open(vts[i], O_RDONLY);
     44 		if (fd < 0)
     45 			continue;
     46 		c = 0;
     47 		if (ioctl(fd, KDGKBTYPE, &c) == 0)
     48 			goto VTfound;
     49 		close(fd);
     50 	}
     51 
     52 	eprintf("couldn't find a console.\n");
     53 VTfound:
     54 	if (ioctl(fd, VT_ACTIVATE, n) == -1)
     55 		eprintf("VT_ACTIVATE %d:", n);
     56 	if (ioctl(fd, VT_WAITACTIVE, n) == -1)
     57 		eprintf("VT_WAITACTIVE %d:", n);
     58 	close(fd);
     59 
     60 	return 0;
     61 }