view toys/chvt.c @ 543:60b97ba66a70

Extensive semi-gratuitous refactoring: factor out common code, handle euid!=uid and egid!=gid cases. (Note: test suite requires root access, possibly container support.)
author Rob Landley <>
date Mon, 12 Mar 2012 23:00:28 -0500
parents 17c0a2013852
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/* vi: set sw=4 ts=4:
 * chvt.c - switch virtual terminals
 * Copyright (C) 2008 David Anders <>
 * Not in SUSv3.


config CHVT
	bool "chvt"
	default y
	  usage: chvt N

	  Change to virtual terminal number N.  (This only works in text mode.)

	  Virtual terminals are the Linux VGA text mode displays, ordinarily
	  switched between via alt-F1, alt-F2, etc.  Use ctrl-alt-F1 to switch
	  from X to a virtual terminal, and alt-F6 (or F7, or F8) to get back.

#include "toys.h"

/* Note: get_console_fb() will need to be moved into a seperate lib section */
int get_console_fd()
	int fd;
	char *consoles[]={"/dev/console", "/dev/vc/0", "/dev/tty", NULL}, **cc;

	cc = consoles;
	while (*cc) {
		fd = open(*cc++, O_RDWR);
		if (fd >= 0) return fd;

	return -1;

void chvt_main(void)
	int vtnum, fd;


	// These numbers are VT_ACTIVATE and VT_WAITACTIVE from linux/vt.h
	if (fd < 0 || ioctl(fd, 0x5606, vtnum) || ioctl(fd, 0x5607, vtnum))