Re: [PATCH] errno.3: Add values for all errors

On 11/23/2017 09:31 AM, Christoph Hellwig wrote:

On Wed, Nov 22, 2017 at 07:15:45PM -0500, Wesley Aptekar-Cassels wrote:

quoted

This patch documents the values of error numbers on linux. This is
something that is in the OpenBSD errno man page, which I find quite
useful.

Error numbers are different for different architectures.

I was just about to say the same.

Someone else recently proposed the same change, and I should have
thought then to add the text that I have added just now to errno(3).
Hopefully this goes someway to addressing your requirements, Wesley.

New text:

       On  Linux, the error numbers that correspond to each symbolic name
       vary somewhat across architectures.  Therefore, numeric values are
       not  included in the list of error names below.  On any particular
       system, one can obtain a list of all symbolic error names and  the
       corresponding error numbers using the errno(1) command:

           $ errno -l
           EPERM 1 Operation not permitted
           ENOENT 2 No such file or directory
           ESRCH 3 No such process
           EINTR 4 Interrupted system call
           EIO 5 Input/output error
           ...

       The  errno(1) command can also be used to look up individual error
       numbers and names as in the following examples:

           $ errno 2
           ENOENT 2 No such file or directory
           $ errno ESRCH
           ESRCH 3 No such process

Cheers,

Michael

-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/
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