.\" Copyright (c) 1995 James R. Van Zandt <jrv@vanzandt.mv.com>
.\" Sat Feb 18 09:11:07 EST 1995
.\"
.\" This is free documentation; you can redistribute it and/or
.\" modify it under the terms of the GNU General Public License as
.\" published by the Free Software Foundation; either version 2 of
.\" the License, or (at your option) any later version.
.\"
.\" The GNU General Public License's references to "object code"
.\" and "executables" are to be interpreted as the output of any
.\" document formatting or typesetting system, including
.\" intermediate and printed output.
.\"
.\" This manual is distributed in the hope that it will be useful,
.\" but WITHOUT ANY WARRANTY; without even the implied warranty of
.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
.\" GNU General Public License for more details.
.\"
.\" You should have received a copy of the GNU General Public
.\" License along with this manual; if not, write to the Free
.\" Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111,
.\" USA.
.\"
.\" Modified, Sun Feb 26 15:08:05 1995, faith@cs.unc.edu
.\" 2007-12-17, Samuel Thibault <samuel.thibault@ens-lyon.org>:
.\"     document the VT_GETHIFONTMASK ioctl
.\" "
.\" Japanese Version Copyright (c) 1996,1997,1998 ISHIKAWA Mutsumi
.\"         all rights reserved.
.\" Translated Tue Feb 6 16:30:31 JST 1997
.\"         by ISHIKAWA Mutsumi <ishikawa@linux.or.jp>
.\"
.\" Japanese Version Last Modified Sun Jan 11 03:55:54 1998
.\"	by ISHIKAWA Mutsumi <ishikawa@linux.or.jp>
.\" Updated Sat Feb 10 23:17:30 JST 2001
.\"	by Yuichi SATO <sato@complex.eng.hokudai.ac.jp>
.\" Updated 2008-02-12, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>, LDP v2.77
.\"
.\" WORD:	virtual console		ۥ󥽡
.\" WORD:	memory			
.\" WORD:	permission		ѡߥå
.\" WORD:	prefix			ץեå
.\" WORD:	screen			꡼
.\" WORD:	cursor			
.\" WORD:	Braille			֥饤
.\"
.TH VCS 4 2007-12-17 "Linux" "Linux Programmer's Manual"
.SH ̾
vcs, vcsa \- ۥ󥽡 (virtual console memory)
.SH 
\fI/dev/vcs0\fP ϥ᥸㡼ʥС (major number) 7ޥʡʥС
(minor number) 0 Υ饯ǥХ (character device) ǡ
̾Υ⡼ɤ 0644ʤ root.tty Ǥ롣
ΥǥХե (device file) 
ɽƤ벾ۥ󥽡üΥ򻲾Ȥ롣
.LP
\fB/dev/vcs[1\-63]\fP ϲۥ󥽡üΤ
饯ǥХǡ᥸㡼ʥС 7ޥʡʥС 1  63
̾ϥ⡼ɤ 0644ʡ root.tty Ǥ롣
\fB/dev/vcsa[0\-63]\fP  \fB/dev/vcs[1\-63]\fP ƱͤǤ뤬
°ǼΤ (ۥȥХȥ)
.I "unsigned short"
ѤƤ꡼Υΰ֤ɽ
4 ХȤξ
\fIlines\fP, \fIcolumns\fP, \fIx\fP, \fIy\fP
(\fIx\fP =\fIy\fP = 0 ̤κ) Ƭˤۤʤ롣

512 ʸեȤɤ硢
9 ӥåܤξ \fI/dev/tty[1\-63]\fP Ф
.BR ioctl (2)
\fBVT_GETHIFONTMASK\fP ԤȤǼǤ
(\fBVT_GETHIFONTMASK\fP ϥͥ 2.6.18 ʹߤ Linux 
ѲǽǤ)
ͤ
.BR ioctl (2)
 3 ܤΰؤ
.I "unsigned short"
˳Ǽ֤롣
.PP
ΥǥХ
.BR console (4)
 screendump
.BR ioctl (2)
ؤȤʤ롣
äơƥԤϥե륷ƥѡߥå
(filesystem permission) Ȥäƥ򥳥ȥǤ롣
.PP
ǽ 8 ĤβüΤΥǥХϡΤ褦ˤƺǤ:

.nf
    for x in 0 1 2 3 4 5 6 7 8; do
        mknod \-m 644 /dev/vcs$x c 7 $x;
        mknod \-m 644 /dev/vcsa$x c 7 $[$x+128];
    done
    chown root:tty /dev/vcs*
.fi

.BR ioctl (2)
ˤ׵ϥݡȤʤ
.SH ե
/dev/vcs[0\-63]
.br
/dev/vcsa[0\-63]
.\" .SH 
.\" Andries Brouwer <aeb@cwi.nl>
.SH С
Linux ͥС 1.1.92 Ƴ줿
.SH 
vt3 Υ꡼פ¹Ԥˤϡü vt1 ؤ
\fIcat /dev/vcs3 >foo\fP ȥפФ褤
դߤΤϡνϤϲʸ (newline character) 
ޤǤʤȤǤ롣
äơ\fIfold \-w 81 /dev/vcs3 | lpr\fP 
(äȤ뤬) \fIsetterm \-dump 3 \-file /proc/self/fd/1\fP Τ褦
餫νɬפˤʤ뤫⤷ʤ
.LP
\fI/dev/vcsa0\fP ǥХȤȤǡ
֥饤򥵥ݡȤ뤳ȤǤ롣

ʲΥץܤβۥ󥽡Υ֤Υ꡼°ʸ
ɽ塢֤طʿѹ :

.nf
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <linux/vt.h>

int
main(void)
{
    int fd;
    char *device = "/dev/vcsa2";
    char *console = "/dev/tty2";
    struct {unsigned char lines, cols, x, y;} scrn;
    unsigned short s;
    unsigned short mask;
    unsigned char ch, attrib;

    fd = open(console, O_RDWR);
    if (fd < 0) {
        perror(console);
        exit(EXIT_FAILURE);
    }
    if (ioctl(fd, VT_GETHIFONTMASK, &mask) < 0) {
        perror("VT_GETHIFONTMASK");
        exit(EXIT_FAILURE);
    }
    (void) close(fd);
    fd = open(device, O_RDWR);
    if (fd < 0) {
        perror(device);
        exit(EXIT_FAILURE);
    }
    (void) read(fd, &scrn, 4);
    (void) lseek(fd, 4 + 2*(scrn.y*scrn.cols + scrn.x), 0);
    (void) read(fd, &s, 2);
    ch = s & 0xff;
    if (attrib & mask)
        ch |= 0x100;
    attrib = ((s & ~mask) >> 8);
    printf("ch='%c' attrib=0x%02x\\n", ch, attrib);
    attrib ^= 0x10;
    (void) lseek(fd, \-1, 1);
    (void) write(fd, &attrib, 1);
    exit(EXIT_SUCCESS);
}
.fi
.SH Ϣ
.BR gpm (8),
.BR console (4),
.BR tty (4),
.BR ttyS (4)
.\" .SH 
.\"   <ishikawa@linux.or.jp>