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An example of using epoll in Go
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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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