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annotate toys/chvt.c @ 389:5e9c1d73c84a

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Implement nohup.
author Rob Landley <rob@landley.net>
date Sun, 20 Nov 2011 21:13:47 -0600
parents 17c0a2013852
children
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d4176f3f3835 Zap toys/Config.in and instead create generated/Config.in from contents of
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1 /* vi: set sw=4 ts=4:
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2 *
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3 * chvt.c - switch virtual terminals
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4 *
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5 * Copyright (C) 2008 David Anders <danders@amltd.com>
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6 *
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7 * Not in SUSv3.
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8
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9 USE_CHVT(NEWTOY(chvt, "<1", TOYFLAG_USR|TOYFLAG_SBIN))
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10
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11 config CHVT
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12 bool "chvt"
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13 default y
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14 help
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15 usage: chvt N
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16
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17 Change to virtual terminal number N. (This only works in text mode.)
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18
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19 Virtual terminals are the Linux VGA text mode displays, ordinarily
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20 switched between via alt-F1, alt-F2, etc. Use ctrl-alt-F1 to switch
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21 from X to a virtual terminal, and alt-F6 (or F7, or F8) to get back.
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22 */
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23
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24 #include "toys.h"
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25
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26 /* Note: get_console_fb() will need to be moved into a seperate lib section */
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27 int get_console_fd()
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28 {
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29 int fd;
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30 char *consoles[]={"/dev/console", "/dev/vc/0", "/dev/tty", NULL}, **cc;
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31
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32 cc = consoles;
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33 while (*cc) {
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34 fd = open(*cc++, O_RDWR);
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35 if (fd >= 0) return fd;
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36 }
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38 return -1;
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39 }
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40
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41 void chvt_main(void)
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42 {
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43 int vtnum, fd;
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45 vtnum=atoi(*toys.optargs);
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47 fd=get_console_fd();
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48 // These numbers are VT_ACTIVATE and VT_WAITACTIVE from linux/vt.h
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49 if (fd < 0 || ioctl(fd, 0x5606, vtnum) || ioctl(fd, 0x5607, vtnum))
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50 perror_exit(NULL);
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51 }