1 /* chvt.c - switch virtual terminals
2 *
3 * Copyright (C) 2008 David Anders <danders@amltd.com>
4
5 USE_CHVT(NEWTOY(chvt, "<1", TOYFLAG_USR|TOYFLAG_BIN))
6
7 config CHVT
8 bool "chvt"
9 default y
10 help
11 usage: chvt N
12
13 Change to virtual terminal number N. (This only works in text mode.)
14
15 Virtual terminals are the Linux VGA text mode displays, ordinarily
16 switched between via alt-F1, alt-F2, etc. Use ctrl-alt-F1 to switch
17 from X to a virtual terminal, and alt-F6 (or F7, or F8) to get back.
18 */
19
20 #include "toys.h"
21
chvt_main(void)22 void chvt_main(void)
23 {
24 int vtnum, fd = fd;
25 char *consoles[]={"/dev/console", "/dev/vc/0", "/dev/tty", NULL}, **cc;
26
27 vtnum=atoi(*toys.optargs);
28 for (cc = consoles; *cc; cc++)
29 if (-1 != (fd = open(*cc, O_RDWR))) break;
30
31 // These numbers are VT_ACTIVATE and VT_WAITACTIVE from linux/vt.h
32 if (!*cc || fd < 0 || ioctl(fd, 0x5606, vtnum) || ioctl(fd, 0x5607, vtnum))
33 perror_exit(0);
34 }
35