On 21/01/2015 08:52, Michael Kerrisk (man-pages) wrote:
>> > The problem is that there is no room for flags field in epoll_pwait1, which is
>> > asked for, in previous discussion thread [1].
> Ahh yes, I certainly should not have forgotten that. But that's easily solved.
> Do as for pselect6():
> 
> strcut sigargs {
>     const sigset_t *ss;
>     size_t          ss_len; /* Size (in bytes) of object pointed
>                                to by 'ss' */
> }
> 
> epoll_pwait1(int epfd, struct epoll_event *events, int maxevents, 
>              struct timespec *timeout, int clock_id, int flags,
>              int timeout,
>              const struct sigargs *sargs);
> 

Alternatively, place the clock_id in the lower 16 bits of flags.
MAX_CLOCKS is 16 right now, so there's room.

Paolo