libgo/syscalls/socket_epoll.go

   1 // socket_epoll.go -- GNU/Linux epoll handling.
   2
   3 // Copyright 2009 The Go Authors. All rights reserved.
   4 // Use of this source code is governed by a BSD-style
   5 // license that can be found in the LICENSE file.
   6
   7 // Support for GNU/Linux epoll.
   8 // Only for implementing net package.
   9 // DO NOT USE DIRECTLY.
  10
  11 package syscall
  12
  13 // We don't take this type directly from the header file because it
  14 // uses a union.  FIXME.
  15
  16 type EpollEvent struct {
  17   Events uint32;
  18   Fd int32;
  19   Pad int32;
  20 };
  21
  22 func libc_epoll_create(size int) int __asm__ ("epoll_create");
  23 func libc_epoll_ctl(epfd, op, fd int, event *EpollEvent) int __asm__ ("epoll_ctl");
  24 func libc_epoll_wait(epfd int, events *EpollEvent, maxevents int,
  25                      timeout int) int __asm__ ("epoll_wait");
  26
  27
  28 func EpollCreate(size int) (fd int, errno int) {
  29   fd = libc_epoll_create(int(size));
  30   if fd < 0 { errno = GetErrno() }
  31   return;
  32 }
  33
  34 func EpollCtl(epfd, op, fd int, ev *EpollEvent) (errno int) {
  35   r := libc_epoll_ctl(epfd, op, fd, ev);
  36   if r < 0 { errno = GetErrno() }
  37   return;
  38 }
  39
  40 func EpollWait(epfd int, ev []EpollEvent, msec int) (n int, errno int) {
  41   var events *EpollEvent;
  42   var maxevents int;
  43   if len(ev) > 0 {
  44     maxevents = len(ev);
  45     events = &ev[0]
  46   }
  47   n = libc_epoll_wait(epfd, events, maxevents, msec);
  48   if n < 0 { errno = GetErrno() }
  49   return;
  50 }