I want to remap capslock to control

[tclh123]

loadkeys will report Couldn't get a file descriptor referring to the console.

# strace loadkeys /home/xxx/capslock2ctrl.kmap
execve("/usr/bin/loadkeys", ["loadkeys", "/home/xxx/capslock2ctrl.kmap"], [/* 13 vars */]) = 0
brk(NULL)                               = 0x1006000
access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT (No such file or directory)
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f07e20f0000
access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=20683, ...}) = 0
mmap(NULL, 20683, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f07e20f5000
close(3)                                = 0
access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT (No such file or directory)
open("/lib/x86_64-linux-gnu/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0P\t\2\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=1868984, ...}) = 0
mmap(NULL, 3971488, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f07e1a30000
mprotect(0x7f07e1bf0000, 2097152, PROT_NONE) = 0
mmap(0x7f07e1df0000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1c0000) = 0x7f07e1df0000
mmap(0x7f07e1df6000, 14752, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f07e1df6000
close(3)                                = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f07e20e0000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f07e20d0000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f07e20c0000
arch_prctl(ARCH_SET_FS, 0x7f07e20d0700) = 0
mprotect(0x7f07e1df0000, 16384, PROT_READ) = 0
mprotect(0x610000, 4096, PROT_READ)     = 0
mprotect(0x7f07e2025000, 4096, PROT_READ) = 0
munmap(0x7f07e20f5000, 20683)           = 0
brk(NULL)                               = 0x1006000
brk(0x1027000)                          = 0x1027000
open("/proc/self/fd/0", O_RDWR)         = 3
ioctl(3, TCGETS, {B38400 opost isig icanon echo ...}) = 0
ioctl(3, KDGKBTYPE, 0x7ffffe09cd47)     = -1 ENOTTY (Inappropriate ioctl for device)
close(3)                                = 0
open("/dev/tty", O_RDWR)                = 3
ioctl(3, TCGETS, {B38400 opost isig icanon echo ...}) = 0
ioctl(3, KDGKBTYPE, 0x7ffffe09cd47)     = -1 ENOTTY (Inappropriate ioctl for device)
close(3)                                = 0
open("/dev/tty0", O_RDWR)               = -1 EIO (Input/output error)
open("/dev/tty0", O_WRONLY)             = -1 EIO (Input/output error)
open("/dev/tty0", O_RDONLY)             = -1 EIO (Input/output error)
open("/dev/vc/0", O_RDWR)               = -1 ENOENT (No such file or directory)
open("/dev/vc/0", O_WRONLY)             = -1 ENOENT (No such file or directory)
open("/dev/vc/0", O_RDONLY)             = -1 ENOENT (No such file or directory)
open("/dev/systty", O_RDWR)             = -1 ENOENT (No such file or directory)
open("/dev/systty", O_WRONLY)           = -1 ENOENT (No such file or directory)
open("/dev/systty", O_RDONLY)           = -1 ENOENT (No such file or directory)
open("/dev/console", O_RDWR)            = -1 ENOENT (No such file or directory)
open("/dev/console", O_WRONLY)          = -1 ENOENT (No such file or directory)
open("/dev/console", O_RDONLY)          = -1 ENOENT (No such file or directory)
open("/dev/tty1", O_RDWR)               = 3
ioctl(3, TCGETS, {B38400 opost isig icanon echo ...}) = 0
ioctl(3, KDGKBTYPE, 0x7ffffe09cd47)     = -1 ENOTTY (Inappropriate ioctl for device)
close(3)                                = 0
open("/dev/tty2", O_RDWR)               = 3
ioctl(3, TCGETS, {B38400 opost isig -icanon -echo ...}) = 0
ioctl(3, KDGKBTYPE, 0x7ffffe09cd47)     = -1 ENOTTY (Inappropriate ioctl for device)
close(3)                                = 0
open("/dev/tty3", O_RDWR)               = -1 ENOENT (No such file or directory)
open("/dev/tty3", O_WRONLY)             = -1 ENOENT (No such file or directory)
open("/dev/tty3", O_RDONLY)             = -1 ENOENT (No such file or directory)
open("/dev/tty4", O_RDWR)               = -1 ENOENT (No such file or directory)
open("/dev/tty4", O_WRONLY)             = -1 ENOENT (No such file or directory)
open("/dev/tty4", O_RDONLY)             = -1 ENOENT (No such file or directory)
open("/dev/tty5", O_RDWR)               = -1 ENOENT (No such file or directory)
open("/dev/tty5", O_WRONLY)             = -1 ENOENT (No such file or directory)
open("/dev/tty5", O_RDONLY)             = -1 ENOENT (No such file or directory)
open("/dev/tty6", O_RDWR)               = -1 ENOENT (No such file or directory)
open("/dev/tty6", O_WRONLY)             = -1 ENOENT (No such file or directory)
open("/dev/tty6", O_RDONLY)             = -1 ENOENT (No such file or directory)
open("/dev/tty7", O_RDWR)               = -1 ENOENT (No such file or directory)
open("/dev/tty7", O_WRONLY)             = -1 ENOENT (No such file or directory)
open("/dev/tty7", O_RDONLY)             = -1 ENOENT (No such file or directory)
open("/dev/tty8", O_RDWR)               = -1 ENOENT (No such file or directory)
open("/dev/tty8", O_WRONLY)             = -1 ENOENT (No such file or directory)
open("/dev/tty8", O_RDONLY)             = -1 ENOENT (No such file or directory)
open("/dev/tty9", O_RDWR)               = -1 ENOENT (No such file or directory)
open("/dev/tty9", O_WRONLY)             = -1 ENOENT (No such file or directory)
open("/dev/tty9", O_RDONLY)             = -1 ENOENT (No such file or directory)
open("/dev/tty10", O_RDWR)              = -1 ENOENT (No such file or directory)
open("/dev/tty10", O_WRONLY)            = -1 ENOENT (No such file or directory)
open("/dev/tty10", O_RDONLY)            = -1 ENOENT (No such file or directory)
open("/dev/tty11", O_RDWR)              = -1 ENOENT (No such file or directory)
open("/dev/tty11", O_WRONLY)            = -1 ENOENT (No such file or directory)
open("/dev/tty11", O_RDONLY)            = -1 ENOENT (No such file or directory)
open("/dev/tty12", O_RDWR)              = -1 ENOENT (No such file or directory)
open("/dev/tty12", O_WRONLY)            = -1 ENOENT (No such file or directory)
open("/dev/tty12", O_RDONLY)            = -1 ENOENT (No such file or directory)
write(2, "Couldn't get a file descriptor r"..., 56Couldn't get a file descriptor referring to the console
) = 56
exit_group(1)                           = ?
+++ exited with 1 +++

related #1806

[tclh123]

maybe related https://wpdev.uservoice.com/forums/266908-command-prompt-console-bash-on-ubuntu-on-windo/suggestions/15597342-keyboard-remapping-should-be-supported

[Biswa96]

Does that key remapping work only in WSL domain? Or for whole Windows system. I generally use AutoHotKey for those keyboard tweaks.

[Brian-Perkins]

WSL does not currently support any of the console IOCTLs. In the strace above and in the related #1806, KDGKBTYPE is failing. To actually do the key remapping, I suspect additional IOCTLs beyond KDGKBTYPE would also be needed.

[therealkenc]

related #1806

Yes this is the same #1806. This one (and the other) is awkward because technically this issue is tag linux-behavior. If you ssh into a Real Linux™ box you would get the same error if you try to use loadkeys(1).

The User Voice cited regarding setxkbmap #787 is related but more complicated. We'll get into the weeds real fast about how X11 keyboard mapping (and the X protocol) works. Let's save that for another day.

At base like Biswapriyo suggests, for now to get the behaviour you are looking for, you would need to remap capslock to control in Windows -- because that's where your keyboard driver lives.

[tclh123]

OK, I just use AutoHotKey to do this remapping, thanks everyone.