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Golang example for using epoll
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| package main | |
| import ( | |
| "fmt" | |
| "net" | |
| "os" | |
| "syscall" | |
| ) | |
| const ( | |
| EPOLLET = 1 << 31 | |
| MaxEpollEvents = 32 | |
| ) | |
| func echo(fd int) { | |
| defer syscall.Close(fd) | |
| var buf [32 * 1024]byte | |
| for { | |
| nbytes, e := syscall.Read(fd, buf[:]) | |
| if nbytes > 0 { | |
| fmt.Printf(">>> %s", buf) | |
| syscall.Write(fd, buf[:nbytes]) | |
| fmt.Printf("<<< %s", buf) | |
| } | |
| if e != nil { | |
| break | |
| } | |
| } | |
| } | |
| func main() { | |
| var event syscall.EpollEvent | |
| var events [MaxEpollEvents]syscall.EpollEvent | |
| fd, err := syscall.Socket(syscall.AF_INET, syscall.O_NONBLOCK|syscall.SOCK_STREAM, 0) | |
| if err != nil { | |
| fmt.Println(err) | |
| os.Exit(1) | |
| } | |
| defer syscall.Close(fd) | |
| if err = syscall.SetNonblock(fd, true); err != nil { | |
| fmt.Println("setnonblock1: ", err) | |
| os.Exit(1) | |
| } | |
| addr := syscall.SockaddrInet4{Port: 2000} | |
| copy(addr.Addr[:], net.ParseIP("0.0.0.0").To4()) | |
| syscall.Bind(fd, &addr) | |
| syscall.Listen(fd, 10) | |
| epfd, e := syscall.EpollCreate1(0) | |
| if e != nil { | |
| fmt.Println("epoll_create1: ", e) | |
| os.Exit(1) | |
| } | |
| defer syscall.Close(epfd) | |
| event.Events = syscall.EPOLLIN | |
| event.Fd = int32(fd) | |
| if e = syscall.EpollCtl(epfd, syscall.EPOLL_CTL_ADD, fd, &event); e != nil { | |
| fmt.Println("epoll_ctl: ", e) | |
| os.Exit(1) | |
| } | |
| for { | |
| nevents, e := syscall.EpollWait(epfd, events[:], -1) | |
| if e != nil { | |
| fmt.Println("epoll_wait: ", e) | |
| break | |
| } | |
| for ev := 0; ev < nevents; ev++ { | |
| if int(events[ev].Fd) == fd { | |
| connFd, _, err := syscall.Accept(fd) | |
| if err != nil { | |
| fmt.Println("accept: ", err) | |
| continue | |
| } | |
| syscall.SetNonblock(fd, true) | |
| event.Events = syscall.EPOLLIN | EPOLLET | |
| event.Fd = int32(connFd) | |
| if err := syscall.EpollCtl(epfd, syscall.EPOLL_CTL_ADD, connFd, &event); err != nil { | |
| fmt.Print("epoll_ctl: ", connFd, err) | |
| os.Exit(1) | |
| } | |
| } else { | |
| go echo(int(events[ev].Fd)) | |
| } | |
| } | |
| } | |
| } |
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