Re: [PATCH RFC v2 0/7] epoll: Introduce new syscalls, epoll_ctl_batch and epoll_pwait1

On Wed, Feb 4, 2015 at 2:36 AM, Fam Zheng [off-list ref] wrote:

2) epoll_pwait1
---------------

NAME
       epoll_pwait1 - wait for an I/O event on an epoll file descriptor

SYNOPSIS

       #include <sys/epoll.h>

       int epoll_pwait1(int epfd, int flags,
                        struct epoll_event *events,
                        int maxevents,
                        struct timespec *timeout,
                        struct sigargs *sig);

DESCRIPTION

       The epoll_pwait1 system call differs from epoll_pwait only in parameter
       types. The first difference is timeout, a pointer to timespec structure
       which allows nanosecond presicion; the second difference, which should
       probably be wrapper by glibc and only expose a sigset_t pointer as in
       pselect6.

       If timeout is NULL, it's treated as if 0 is specified in epoll_pwait
       (return immediately). Otherwise it's converted to nanosecond scalar,
       again, with the same convention as epoll_pwait's timeout.

Is the timeout absolute or relative?

I'd kind of like the ability to set timeouts on multiple clocks at the
same time, but I can live without that.

--Andy

RETURN VALUE

       The same as said in epoll_pwait(2).

ERRORS

       The same as said in man epoll_pwait(2), plus:

       EINVAL flags is not zero.


CONFORMING TO

       epoll_pwait1() is Linux-specific.

SEE ALSO

       epoll_create(2), epoll_ctl(2), epoll_wait(2), epoll_pwait(2), epoll(7)

Fam Zheng (7):
  epoll: Extract epoll_wait_do and epoll_pwait_do
  epoll: Specify clockid explicitly
  epoll: Extract ep_ctl_do
  epoll: Add implementation for epoll_ctl_batch
  x86: Hook up epoll_ctl_batch syscall
  epoll: Add implementation for epoll_pwait1
  x86: Hook up epoll_pwait1 syscall

 arch/x86/syscalls/syscall_32.tbl |   2 +
 arch/x86/syscalls/syscall_64.tbl |   2 +
 fs/eventpoll.c                   | 241 ++++++++++++++++++++++++++-------------
 include/linux/syscalls.h         |   9 ++
 include/uapi/linux/eventpoll.h   |  11 ++
 5 files changed, 186 insertions(+), 79 deletions(-)

--
1.9.3

-- 
Andy Lutomirski
AMA Capital Management, LLC