Re: [PATCH manpages] epoll_wait.2: add epoll_pwait2

["Michael Kerrisk (man-pages)" <mtk.manpages@xxxxxxxxx>]

Hi Florian,

On Tue, 12 Jan 2021 at 13:33, Florian Weimer <fweimer@xxxxxxxxxx> wrote:
>
> * Willem de Bruijn:
>
> > From: Willem de Bruijn <willemb@xxxxxxxxxx>
> >
> > Expand the epoll_wait page with epoll_pwait2, an epoll_wait variant
> > that takes a struct timespec to enable nanosecond resolution timeout.
> >
> >     int epoll_pwait2(int fd, struct epoll_event *events,
> >                      int maxevents,
> >                      const struct timespec *timeout,
> >                      const sigset_t *sigset);
>
> Does it really use struct timespec?  With 32-bit times on most 32-bit
> targets?

The type inside the kernel seems to be:

[[
SYSCALL_DEFINE6(epoll_pwait2, int, epfd, struct epoll_event __user *, events,
                int, maxevents, const struct __kernel_timespec __user
*, timeout,

struct __kernel_timespec {
        __kernel_time64_t       tv_sec;                 /* seconds */
        long long               tv_nsec;                /* nanoseconds */
};
]]

So, 64 bits by the look of things.

Thanks,

Michael

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