Exemplos de Iovec.Base em Golang

Exemplo n.º 1

Arquivo: main.go Projeto: Loofort/udp_pps_speed_test

func sendMMsg(addr *net.UDPAddr, i int) {
	i = i / chunk_sz
	log.Printf("Start `sendMMsg` test with %d iteration\n", i)

	laddr := UDPAddrToSockaddr(&net.UDPAddr{Port: local_port, IP: net.IPv4zero})
	raddr := UDPAddrToSockaddr(addr)

	fd := connectUDP(laddr, raddr)

	msgcnt := chunk_sz
	var msgArr [chunk_sz]MMsghdr
	for j := 0; j < msgcnt; j++ {
		p := make([]byte, payload_sz)
		for k := 0; k < payload_sz; k++ {
			p[k] = byte(k)
		}

		var iov syscall.Iovec
		iov.Base = (*byte)(unsafe.Pointer(&p[0]))
		iov.SetLen(len(p))

		var msg syscall.Msghdr
		msg.Iov = &iov
		msg.Iovlen = 1

		msgArr[j] = MMsghdr{msg, 0}
	}

	for ; i > 0; i-- {
		//_, _, e1 := syscall.Syscall6(C.SYS_sendmmsg, uintptr(fd), uintptr(unsafe.Pointer(&msgArr[0])), uintptr(msgcnt), uintptr(syscall.MSG_DONTWAIT), 0, 0)
		_, _, e1 := syscall.Syscall6(C.SYS_sendmmsg, uintptr(fd), uintptr(unsafe.Pointer(&msgArr[0])), uintptr(msgcnt), 0, 0, 0)
		if e1 != 0 {
			panic("error on sendmmsg")
		}
	}
}