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netpoll_bsd.go
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//go:build darwin || netbsd || freebsd || openbsd || dragonfly
// +build darwin netbsd freebsd openbsd dragonfly
// 实现 mac环境不支持epoll 用kquene替换
package gn
import (
"fmt"
"syscall"
)
const (
EpollRead = syscall.EV_ADD | syscall.EV_EOF
EpollClose = uint16(syscall.EV_EOF)
)
type epoll struct {
listenFD int
epollFD int
ts syscall.Timespec
changes []syscall.Kevent_t
}
func newNetpoll(address string) (netpoll, error) {
listenFD, err := syscall.Socket(syscall.AF_INET, syscall.SOCK_STREAM, 0)
if err != nil {
log.Error(err)
return nil, err
}
err = syscall.SetsockoptInt(listenFD, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1)
if err != nil {
log.Error(err)
return nil, err
}
addr, port, err := getIPPort(address)
if err != nil {
return nil, err
}
err = syscall.Bind(listenFD, &syscall.SockaddrInet4{
Port: port,
Addr: addr,
})
if err != nil {
log.Error(err)
return nil, err
}
err = syscall.Listen(listenFD, 1024)
if err != nil {
log.Error(err)
return nil, err
}
// !!
// mac epollFD
epollFD, err := syscall.Kqueue()
if err != nil {
panic(err)
}
_, err = syscall.Kevent(epollFD, []syscall.Kevent_t{{
Ident: 0,
Filter: syscall.EVFILT_USER,
Flags: syscall.EV_ADD | syscall.EV_CLEAR,
}}, nil, nil)
if err != nil {
panic(err)
}
//!!
return &epoll{
listenFD: listenFD,
epollFD: epollFD,
ts: syscall.NsecToTimespec(1e9),
}, nil
}
func (n *epoll) accept() (nfd int, addr string, err error) {
nfd, sa, err := syscall.Accept(n.listenFD)
if err != nil {
return
}
//设置为非阻塞状态
err = syscall.SetNonblock(nfd, true)
if err != nil {
return
}
n.changes = append(n.changes, syscall.Kevent_t{
Ident: uint64(nfd), Flags: EpollRead, Filter: syscall.EVFILT_READ,
})
s := sa.(*syscall.SockaddrInet4)
addr = fmt.Sprintf("%d.%d.%d.%d:%d", s.Addr[0], s.Addr[1], s.Addr[2], s.Addr[3], s.Port)
return
}
func (n *epoll) closeFD(fd int) error {
// 移除文件描述符的监听
if len(n.changes) <= 1 {
n.changes = nil
} else {
changes := make([]syscall.Kevent_t, 0, len(n.changes)-1)
ident := uint64(fd)
for _, ke := range n.changes {
if ke.Ident != ident {
changes = append(changes, ke)
}
}
n.changes = changes
}
// 关闭文件描述符
err := syscall.Close(fd)
if err != nil {
return err
}
return nil
}
func (n *epoll) getEvents() ([]event, error) {
epollEvents := make([]syscall.Kevent_t, 100)
changes := n.changes
retry:
num, err := syscall.Kevent(n.epollFD, changes, epollEvents, &n.ts)
if err != nil {
if err == syscall.EINTR {
goto retry
}
return nil, err
}
events := make([]event, 0, len(epollEvents))
for i := 0; i < num; i++ {
event := event{
FD: int32(epollEvents[i].Ident),
}
if epollEvents[i].Flags == EpollClose {
event.Type = EventClose
} else {
event.Type = EventIn
}
events = append(events, event)
}
return events, nil
}
func (n *epoll) closeFDRead(fd int) error {
_, _, e := syscall.Syscall(syscall.SHUT_RD, uintptr(fd), 0, 0)
if e != 0 {
return e
}
return nil
}
var _ netpoll = &epoll{}