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annotate toys/other/chvt.c @ 694:786841fdb1e0

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Reindent to two spaces per level. Remove vi: directives that haven't worked right in years (ubuntu broke its' vim implementation). Remove trailing spaces. Add/remove blank lines. Re-wordwrap in places. Update documentation with new coding style. The actual code should be the same afterward, this is just cosmetic refactoring.
author Rob Landley <rob@landley.net>
date Tue, 13 Nov 2012 17:14:08 -0600
parents 6df4ccc0acbe
children bfe79fc710da
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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786841fdb1e0 Reindent to two spaces per level. Remove vi: directives that haven't worked right in years (ubuntu broke its' vim implementation). Remove trailing spaces. Add/remove blank lines. Re-wordwrap in places. Update documentation with new coding style.
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1 /* chvt.c - switch virtual terminals
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2 *
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3 * Copyright (C) 2008 David Anders <danders@amltd.com>
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5 USE_CHVT(NEWTOY(chvt, "<1", TOYFLAG_USR|TOYFLAG_SBIN))
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7 config CHVT
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8 bool "chvt"
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9 default y
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10 help
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11 usage: chvt N
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13 Change to virtual terminal number N. (This only works in text mode.)
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15 Virtual terminals are the Linux VGA text mode displays, ordinarily
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16 switched between via alt-F1, alt-F2, etc. Use ctrl-alt-F1 to switch
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17 from X to a virtual terminal, and alt-F6 (or F7, or F8) to get back.
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18 */
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19
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20 #include "toys.h"
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21
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22 /* Note: get_console_fb() will need to be moved into a seperate lib section */
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23 int get_console_fd()
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24 {
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25 int fd;
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26 char *consoles[]={"/dev/console", "/dev/vc/0", "/dev/tty", NULL}, **cc;
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28 cc = consoles;
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29 while (*cc) {
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30 fd = open(*cc++, O_RDWR);
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31 if (fd >= 0) return fd;
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32 }
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34 return -1;
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35 }
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37 void chvt_main(void)
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38 {
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39 int vtnum, fd;
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41 vtnum=atoi(*toys.optargs);
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43 fd=get_console_fd();
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44 // These numbers are VT_ACTIVATE and VT_WAITACTIVE from linux/vt.h
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45 if (fd < 0 || ioctl(fd, 0x5606, vtnum) || ioctl(fd, 0x5607, vtnum))
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46 perror_exit(NULL);
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47 }