Re: [PATCH] clone.2, fork.2: Document ERESTARTNOINTR error code

["Michael Kerrisk (man-pages)" <mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

On 05/04/2016 10:55 AM, Nikola Forró wrote:
> Since Linux 2.6.17, clone and fork syscalls return ERESTARTNOINTR
> when interrupted by a signal before newly created process is added
> to its process group.
> This error code can only be seen by ptrace at syscall exit tracing.
> 
> The information was obtained from kernel source code:
> http://bit.ly/24xdofn

Thanks Nikola. I see this relates to kernel commit 4a2c7a7837da. 
Patch applied.

Cheers,

Michael


> Signed-off-by: Nikola Forró <nforro-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
> ---
>  man2/clone.2 | 4 ++++
>  man2/fork.2  | 4 ++++
>  2 files changed, 8 insertions(+)
> 
> diff --git a/man2/clone.2 b/man2/clone.2
> index 8373700..ab1e58d 100644
> --- a/man2/clone.2
> +++ b/man2/clone.2
> @@ -1013,6 +1013,10 @@ and the call would cause the limit on the number of
>  nested user namespaces to be exceeded.
>  See
>  .BR user_namespaces (7).
> +.TP
> +.BR ERESTARTNOINTR " (since Linux 2.6.17)"
> +System call was interrupted by a signal and will be restarted.
> +(This can be seen only during a trace.)
>  .SH VERSIONS
>  There is no entry for
>  .BR clone ()
> diff --git a/man2/fork.2 b/man2/fork.2
> index 559a47f..3accc8c 100644
> --- a/man2/fork.2
> +++ b/man2/fork.2
> @@ -242,6 +242,10 @@ failed to allocate the necessary kernel structures because memory is tight.
>  is not supported on this platform (for example,
>  .\" e.g., arm (optionally), blackfin, c6x, frv, h8300, microblaze, xtensa
>  hardware without a Memory-Management Unit).
> +.TP
> +.BR ERESTARTNOINTR " (since Linux 2.6.17)"
> +System call was interrupted by a signal and will be restarted.
> +(This can be seen only during a trace.)
>  .SH CONFORMING TO
>  POSIX.1-2001, POSIX.1-2008, SVr4, 4.3BSD.
>  .SH NOTES
> 


-- 
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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