On Fri, 2014-08-22 at 09:30 -0700, Andy Lutomirski wrote:
> ENOSYS is the mechanism used by user code to detect whether the
> running kernel implements a given system call. It should not be
> returned by anything except an unimplemented system call.
>
> Unfortunately, it is rather frequently used in the kernel to
> indicate that various new functions of existing system calls are not
> implemented. This should be discouraged.
>
> Improve the command in errno.h to help clarify ENOSYS's purpose.
[]
> diff --git a/include/uapi/asm-generic/errno.h
> b/include/uapi/asm-generic/errno.h
[]
> @@ -6,7 +6,7 @@
[]
> -#define ENOSYS 38 /* Function not implemented */
> +#define ENOSYS 38 /* Bad system call number */
I suggest "Invalid" rather than "Bad".
Maybe also add something like:
/* see: man 2 syscalls */
or
/* grep for SYSCALL_DEFINE */
--
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