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net.go
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net.go
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package main
import (
"log"
"golang.org/x/sys/unix"
)
const BACKLOG int = 64
func Accept(fd int) (int, error) {
nfd, _, err := unix.Accept(fd)
// ignore client addr for now
return nfd, err
}
func Connect(host [4]byte, port int) (int, error) {
s, err := unix.Socket(unix.AF_INET, unix.SOCK_STREAM, 0)
if err != nil {
log.Printf("init socket err: %v\n", err)
return -1, err
}
var addr unix.SockaddrInet4
addr.Addr = host
addr.Port = port
err = unix.Connect(s, &addr)
if err != nil {
log.Printf("connect err: %v\n", err)
return -1, err
}
return s, nil
}
func Read(fd int, buf []byte) (int, error) {
return unix.Read(fd, buf)
}
func Write(fd int, buf []byte) (int, error) {
return unix.Write(fd, buf)
}
func Close(fd int) {
unix.Close(fd)
}
func TcpServer(port int) (int, error) {
s, err := unix.Socket(unix.AF_INET, unix.SOCK_STREAM, 0)
if err != nil {
log.Printf("init socket err: %v\n", err)
return -1, nil
}
err = unix.SetsockoptInt(s, unix.SOL_SOCKET, unix.SO_REUSEPORT, port)
if err != nil {
log.Printf("set SO_REUSEPORT err: %v\n", err)
unix.Close(s)
return -1, nil
}
var addr unix.SockaddrInet4
// golang.syscall will handle htons
addr.Port = port
// golang will set addr.Addr = any(0)
err = unix.Bind(s, &addr)
if err != nil {
log.Printf("bind addr err: %v\n", err)
unix.Close(s)
return -1, nil
}
err = unix.Listen(s, BACKLOG)
if err != nil {
log.Printf("listen socket err: %v\n", err)
unix.Close(s)
return -1, nil
}
return s, nil
}