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Message-ID: <1408726332.13483.25.camel@joe-AO725> Date: Fri, 22 Aug 2014 09:52:12 -0700 From: Joe Perches <joe@...ches.com> To: Andy Lutomirski <luto@...capital.net> Cc: "Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>, Andy Whitcroft <apw@...onical.com>, Arnd Bergmann <arnd@...db.de>, Andrew Morton <akpm@...ux-foundation.org>, linux-kernel@...r.kernel.org Subject: Re: [PATCH] errno.h: Improve ENOSYS's comment 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 */ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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