vcs(4) Device Drivers Manual vcs(4) vcs, vcsa - /dev/vcs0 7 0, 0644 root:tty. . /dev/vcs[1-63] , 7 1 63, 0644 root:tty. /dev/vcsa[0-63] , unsigned short ( ) , : lines, columns, x, y. (x = y = 0 .) When a 512-character font is loaded, the 9th bit position can be fetched by applying the ioctl(2) VT_GETHIFONTMASK operation (available since Linux 2.6.18) on /dev/tty[1-63]; the value is returned in the unsigned short pointed to by the third ioctl(2) argument. ioctl(2) ioctl_console(2), . : 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(2) . /dev/vcs[0-63] /dev/vcsa[0-63] Introduced with Linux 1.1.92. vt3, vt1 cat /dev/vcs3 >foo , , , fold -w 81 /dev/vcs3 | lpr () setterm -dump 3 -file /proc/self/fd/1 /dev/vcsa0 . , , . #include #include #include #include #include #include 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 attrib; int ch; 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), SEEK_SET); (void) read(fd, &s, 2); ch = s & 0xff; if (s & mask) ch |= 0x100; attrib = ((s & ~mask) >> 8); printf("ch=%#03x attrib=%#02x\n", ch, attrib); s ^= 0x1000; (void) lseek(fd, -2, SEEK_CUR); (void) write(fd, &s, 2); exit(EXIT_SUCCESS); } ioctl_console(2), tty(4), ttyS(4), gpm(8) () Azamat Hackimov , Dmitriy Ovchinnikov , Dmitry Bolkhovskikh , Katrin Kutepova , Yuri Kozlov ; GNU (GNU General Public License - GPL, 3 ) , - . - , , () () () <>. Linux 6.17 8 2026 . vcs(4)