VCS

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/dev/vcs[1-63] ¤Ï²¾ÁÛ¥³¥ó¥½¡¼¥ëüËö¤Î¤¿¤á¤Î ¥­¥ã¥é¥¯¥¿¡¼¥Ç¥Ð¥¤¥¹¤Ç¡¢¥á¥¸¥ã¡¼¥Ê¥ó¥Ð¡¼ 7¡¢¥Þ¥¤¥Ê¡¼¥Ê¥ó¥Ð¡¼ 1 ¤«¤é 63¡¢ Ä̾¥â¡¼¥É 0644¡¢¥ª¡¼¥Ê¡¼ root.tty ¤Ç¤¢¤ë¡£ /dev/vcsa[0-63] ¤Ï /dev/vcs[1-63] ¤ÈƱÍͤǤ¢¤ë¤¬¡¢ °À­¡¢¥¹¥¯¥ê¡¼¥ó¤Î¥µ¥¤¥º¡¦¥«¡¼¥½¥ë¤Î°ÌÃÖ¤òɽ¤¹ 4 ¥Ð¥¤¥È¤Î¥×¥ì¥Õ¥£¥Ã¥¯¥¹: lines, columns,x, y (x =y = 0 ¤¬²èÌ̤κ¸¾å) ¤ò´Þ¤ó¤Ç¤¤¤ë¡£

¤³¤ì¤é¤Ï console(4) ¤Î screendump ioctl ¤òÂåÂؤ¹¤ë¡£ ½¾¤Ã¤Æ¡¢¥·¥¹¥Æ¥à´ÉÍý¼Ô¤Ï¥Õ¥¡¥¤¥ë¥·¥¹¥Æ¥à¥Ñ¡¼¥ß¥Ã¥·¥ç¥ó (filesystem permission) ¤ò»È¤Ã¤Æ¥¢¥¯¥»¥¹¤ò¥³¥ó¥È¥í¡¼¥ë¤Ç¤­¤ë¡£

ºÇ½é¤Î 8 ¤Ä¤Î²¾ÁÛüËö¤Î¤¿¤á¤Î¥Ç¥Ð¥¤¥¹¤Ï¡¢¼¡¤Î¤è¤¦¤Ë¤·¤Æºî¤ë»ö¤¬¤Ç¤­¤ë:

        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*

ioctl() ¤Ë¤è¤ëÍ×µá¤Ï¥µ¥Ý¡¼¥È¤µ¤ì¤Ê¤¤¡£  

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/dev/vcsa0 ¥Ç¥Ð¥¤¥¹¤Ï¡¢¥Ö¥é¥¤¥æÅÀ»ú¤ò¥µ¥Ý¡¼¥È¤¹¤ë¤¿¤á¤Ë»È¤ï¤ì¤ë¡£

°Ê²¼¤Î¥×¥í¥°¥é¥à¤ÏÂèÆó²¾ÁÛ¥³¥ó¥½¡¼¥ë¤Î¥«¡¼¥½¥ë¤Î²¼¤Î¥¹¥¯¥ê¡¼¥ó°À­¤Èʸ»ú ¤òɽ¼¨¤·¡¢¼¡¤Ë¤½¤³¤ÎÇØ·Ê¿§¤òÊѹ¹¤¹¤ë¡£:

        #include <unistd.h>
        #include <stdio.h>
        #include <fcntl.h>

        int main() {
                int fd;
                struct {char lines, cols, x, y;} scrn;
                char ch, attrib;

                fd = open("/dev/vcsa2", O_RDWR);
                (void)read(fd, &scrn, 4);
                (void)lseek(fd, 4 + 2*(scrn.y*scrn.cols + scrn.x), 0);
                (void)read(fd, &ch, 1);
                (void)read(fd, &attrib, 1);
                printf("ch='%c' attrib=0x%02x\n", ch, attrib);
                attrib ^= 0x10;
                (void)lseek(fd, -1, 1);
                (void)write(fd, &attrib, 1);
                return 0;
        }

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