[LEDE-DEV] [PATCH libubox 2/2] uloop: Enable utracing of multi-threaded programs

[Yousong Zhou]

On 12 September 2017 at 19:12, Michal Sojka <sojkam1 at fel.cvut.cz> wrote:
> This is needed for Linux < 4.7 or < 4.4.13 to report ptrace events in
> threads.
>
> Signed-off-by: Michal Sojka <sojkam1 at fel.cvut.cz>
> ---
>  uloop.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/uloop.c b/uloop.c
> index 3813e18..e6d77df 100644
> --- a/uloop.c
> +++ b/uloop.c
> @@ -369,7 +369,7 @@ static void uloop_handle_processes(void)
>         do_sigchld = false;
>
>         while (1) {
> -               pid = waitpid(-1, &ret, WNOHANG);
> +               pid = waitpid(-1, &ret, WNOHANG|__WALL);
>                 if (pid < 0 && errno == EINTR)
>                         continue;
>

NACK because this changes the current behaviour of only handling
termination of child processes notified via SIGCHLD signal.  It may
break existing users of the library.

                yousong