コード例 #1
0
ファイル: syscall_linux.go プロジェクト: hoffoo/go-fuse
func writev(fd int, packet [][]byte) (n int, err error) {
	iovecs := make([]syscall.Iovec, 0, len(packet))

	for _, v := range packet {
		if len(v) == 0 {
			continue
		}
		vec := syscall.Iovec{
			Base: &v[0],
		}
		vec.SetLen(len(v))
		iovecs = append(iovecs, vec)
	}

	n, errno := sys_writev(fd, &iovecs[0], len(iovecs))
	if errno != 0 {
		err = os.NewSyscallError("writev", syscall.Errno(errno))
	}
	return n, err
}
コード例 #2
0
func writev(fd int, packet [][]byte) (n int, err error) {
	iovecs := make([]syscall.Iovec, 0, len(packet))

	for _, v := range packet {
		if len(v) == 0 {
			continue
		}
		vec := syscall.Iovec{
			Base: &v[0],
		}
		vec.SetLen(len(v))
		iovecs = append(iovecs, vec)
	}

	sysErr := handleEINTR(func() error {
		var err error
		n, err = sys_writev(fd, &iovecs[0], len(iovecs))
		return err
	})
	if sysErr != nil {
		err = os.NewSyscallError("writev", sysErr)
	}
	return n, err
}
コード例 #3
0
ファイル: main.go プロジェクト: 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")
		}
	}
}