# std/epoll

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# Imports

posix

# Types

    EpollData {.importc: "epoll_data_t", header: "<sys/epoll.h>", pure, final, union.} = object
      `ptr`* {.importc: "ptr".}: pointer
      fd* {.importc: "fd".}: cint
      u32* {.importc: "u32".}: uint32
      u64* {.importc: "u64".}: uint64

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    EpollEvent {.importc: "struct epoll_event", header: "<sys/epoll.h>", pure, final.} = object
      events*: uint32
      data*: EpollData

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# Consts

    EPOLL_CTL_ADD = 1

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    EPOLL_CTL_DEL = 2

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    EPOLL_CTL_MOD = 3

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    EPOLLERR = 0x00000008

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    EPOLLET = 2147483648

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    EPOLLEXCLUSIVE = 268435456

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    EPOLLHUP = 0x00000010

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    EPOLLIN = 0x00000001

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    EPOLLMSG = 0x00000400

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    EPOLLONESHOT = 1073741824

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    EPOLLOUT = 0x00000004

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    EPOLLPRI = 0x00000002

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    EPOLLRDBAND = 0x00000080

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    EPOLLRDHUP = 0x00002000

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    EPOLLRDNORM = 0x00000040

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    EPOLLWAKEUP = 536870912

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    EPOLLWRBAND = 0x00000200

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    EPOLLWRNORM = 0x00000100

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# Procs

    proc epoll_create(size: cint): cint {.importc: "epoll_create",
                                          header: "<sys/epoll.h>", ...raises: [],
                                          tags: [].}

  Creates an epoll instance. Returns an fd for the new instance.

  The "size" parameter is a hint specifying the number of file descriptors to be associated with the new instance. The fd returned by epoll_create() should be closed with close().

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    proc epoll_create1(flags: cint): cint {.importc: "epoll_create1",
                                            header: "<sys/epoll.h>", ...raises: [],
                                            tags: [].}

  Same as epoll_create but with an FLAGS parameter. The unused SIZE parameter has been dropped. Source Edit

    proc epoll_ctl(epfd: cint; op: cint; fd: cint | SocketHandle;
                   event: ptr EpollEvent): cint {.importc: "epoll_ctl",
        header: "<sys/epoll.h>", ...raises: [], tags: [].}

  Manipulate an epoll instance "epfd". Returns `0` in case of success, `-1` in case of error (the "errno" variable will contain the specific error code).

  The "op" parameter is one of the `EPOLL_CTL_*` constants defined above. The "fd" parameter is the target of the operation. The "event" parameter describes which events the caller is interested in and any associated user data.

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    proc epoll_wait(epfd: cint; events: ptr EpollEvent; maxevents: cint;
                    timeout: cint): cint {.importc: "epoll_wait",
                                           header: "<sys/epoll.h>", ...raises: [],
                                           tags: [].}

  Wait for events on an epoll instance "epfd". Returns the number of triggered events returned in "events" buffer. Or -1 in case of error with the "errno" variable set to the specific error code. The "events" parameter is a buffer that will contain triggered events. The "maxevents" is the maximum number of events to be returned ( usually size of "events" ). The "timeout" parameter specifies the maximum wait time in milliseconds (-1 == infinite).

  This function is a cancellation point and therefore not marked with __THROW.

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