Kernel+LibC: Turn errno codes into a strongly typed enum

..and allow implicit creation of KResult and KResultOr from ErrnoCode.
This means that kernel functions that return those types can finally
do "return EINVAL;" and it will just work.

There's a handful of functions that still deal with signed integers
that should be converted to return KResults.

Userland/Libraries/LibC/errno_numbers.h

@@ -26,78 +26,155 @@
 
 #pragma once
 
-#define EPERM 1
-#define ENOENT 2
-#define ESRCH 3
-#define EINTR 4
-#define EIO 5
-#define ENXIO 6
-#define E2BIG 7
-#define ENOEXEC 8
-#define EBADF 9
-#define ECHILD 10
-#define EAGAIN 11
-#define ENOMEM 12
-#define EACCES 13
-#define EFAULT 14
-#define ENOTBLK 15
-#define EBUSY 16
-#define EEXIST 17
-#define EXDEV 18
-#define ENODEV 19
-#define ENOTDIR 20
-#define EISDIR 21
-#define EINVAL 22
-#define ENFILE 23
-#define EMFILE 24
-#define ENOTTY 25
-#define ETXTBSY 26
-#define EFBIG 27
-#define ENOSPC 28
-#define ESPIPE 29
-#define EROFS 30
-#define EMLINK 31
-#define EPIPE 32
-#define ERANGE 33
-#define ENAMETOOLONG 34
-#define ELOOP 35
-#define EOVERFLOW 36
-#define EOPNOTSUPP 37
-#define ENOSYS 38
-#define ENOTIMPL 39
-#define EAFNOSUPPORT 40
-#define ENOTSOCK 41
-#define EADDRINUSE 42
-#define EWHYTHO 43
-#define ENOTEMPTY 44
-#define EDOM 45
-#define ECONNREFUSED 46
-#define EADDRNOTAVAIL 47
-#define EISCONN 48
-#define ECONNABORTED 49
-#define EALREADY 50
-#define ECONNRESET 51
-#define EDESTADDRREQ 52
-#define EHOSTUNREACH 53
-#define EILSEQ 54
-#define EMSGSIZE 55
-#define ENETDOWN 56
-#define ENETUNREACH 57
-#define ENETRESET 58
-#define ENOBUFS 59
-#define ENOLCK 60
-#define ENOMSG 61
-#define ENOPROTOOPT 62
-#define ENOTCONN 63
-#define EWOULDBLOCK 64
-#define EPROTONOSUPPORT 65
-#define EDEADLK 66
-#define ETIMEDOUT 67
-#define EPROTOTYPE 68
-#define EINPROGRESS 69
-#define ENOTHREAD 70
-#define EPROTO 71
-#define ENOTSUP 72
-#define EPFNOSUPPORT 73
-#define EDIRINTOSELF 74
-#define EMAXERRNO 75
+enum ErrnoCode {
+    EPERM = 1,
+#define EPERM EPERM
+    ENOENT,
+#define ENOENT ENOENT
+    ESRCH,
+#define ESRCH ESRCH
+    EINTR,
+#define EINTR EINTR
+    EIO,
+#define EIO EIO
+    ENXIO,
+#define ENXIO ENXIO
+    E2BIG,
+#define E2BIG E2BIG
+    ENOEXEC,
+#define ENOEXEC ENOEXEC
+    EBADF,
+#define EBADF EBADF
+    ECHILD,
+#define ECHILD ECHILD
+    EAGAIN,
+#define EAGAIN EAGAIN
+    ENOMEM,
+#define ENOMEM ENOMEM
+    EACCES,
+#define EACCES EACCES
+    EFAULT,
+#define EFAULT EFAULT
+    ENOTBLK,
+#define ENOTBLK ENOTBLK
+    EBUSY,
+#define EBUSY EBUSY
+    EEXIST,
+#define EEXIST EEXIST
+    EXDEV,
+#define EXDEV EXDEV
+    ENODEV,
+#define ENODEV ENODEV
+    ENOTDIR,
+#define ENOTDIR ENOTDIR
+    EISDIR,
+#define EISDIR EISDIR
+    EINVAL,
+#define EINVAL EINVAL
+    ENFILE,
+#define ENFILE ENFILE
+    EMFILE,
+#define EMFILE EMFILE
+    ENOTTY,
+#define ENOTTY ENOTTY
+    ETXTBSY,
+#define ETXTBSY ETXTBSY
+    EFBIG,
+#define EFBIG EFBIG
+    ENOSPC,
+#define ENOSPC ENOSPC
+    ESPIPE,
+#define ESPIPE ESPIPE
+    EROFS,
+#define EROFS EROFS
+    EMLINK,
+#define EMLINK EMLINK
+    EPIPE,
+#define EPIPE EPIPE
+    ERANGE,
+#define ERANGE ERANGE
+    ENAMETOOLONG,
+#define ENAMETOOLONG ENAMETOOLONG
+    ELOOP,
+#define ELOOP ELOOP
+    EOVERFLOW,
+#define EOVERFLOW EOVERFLOW
+    EOPNOTSUPP,
+#define EOPNOTSUPP EOPNOTSUPP
+    ENOSYS,
+#define ENOSYS ENOSYS
+    ENOTIMPL,
+#define ENOTIMPL ENOTIMPL
+    EAFNOSUPPORT,
+#define EAFNOSUPPORT EAFNOSUPPORT
+    ENOTSOCK,
+#define ENOTSOCK ENOTSOCK
+    EADDRINUSE,
+#define EADDRINUSE EADDRINUSE
+    EWHYTHO,
+#define EWHYTHO EWHYTHO
+    ENOTEMPTY,
+#define ENOTEMPTY ENOTEMPTY
+    EDOM,
+#define EDOM EDOM
+    ECONNREFUSED,
+#define ECONNREFUSED ECONNREFUSED
+    EADDRNOTAVAIL,
+#define EADDRNOTAVAIL EADDRNOTAVAIL
+    EISCONN,
+#define EISCONN EISCONN
+    ECONNABORTED,
+#define ECONNABORTED ECONNABORTED
+    EALREADY,
+#define EALREADY EALREADY
+    ECONNRESET,
+#define ECONNRESET ECONNRESET
+    EDESTADDRREQ,
+#define EDESTADDRREQ EDESTADDRREQ
+    EHOSTUNREACH,
+#define EHOSTUNREACH EHOSTUNREACH
+    EILSEQ,
+#define EILSEQ EILSEQ
+    EMSGSIZE,
+#define EMSGSIZE EMSGSIZE
+    ENETDOWN,
+#define ENETDOWN ENETDOWN
+    ENETUNREACH,
+#define ENETUNREACH ENETUNREACH
+    ENETRESET,
+#define ENETRESET ENETRESET
+    ENOBUFS,
+#define ENOBUFS ENOBUFS
+    ENOLCK,
+#define ENOLCK ENOLCK
+    ENOMSG,
+#define ENOMSG ENOMSG
+    ENOPROTOOPT,
+#define ENOPROTOOPT ENOPROTOOPT
+    ENOTCONN,
+#define ENOTCONN ENOTCONN
+    EWOULDBLOCK,
+#define EWOULDBLOCK EWOULDBLOCK
+    EPROTONOSUPPORT,
+#define EPROTONOSUPPORT EPROTONOSUPPORT
+    EDEADLK,
+#define EDEADLK EDEADLK
+    ETIMEDOUT,
+#define ETIMEDOUT ETIMEDOUT
+    EPROTOTYPE,
+#define EPROTOTYPE EPROTOTYPE
+    EINPROGRESS,
+#define EINPROGRESS EINPROGRESS
+    ENOTHREAD,
+#define ENOTHREAD ENOTHREAD
+    EPROTO,
+#define EPROTO EPROTO
+    ENOTSUP,
+#define ENOTSUP ENOTSUP
+    EPFNOSUPPORT,
+#define EPFNOSUPPORT EPFNOSUPPORT
+    EDIRINTOSELF,
+#define EDIRINTOSELF EDIRINTOSELF
+    EMAXERRNO,
+#define EMAXERRNO EMAXERRNO
+};