func (h *TPacket) pollForFirstPacket(hdr header) error {
for hdr.getStatus()&C.TP_STATUS_USER == 0 {
h.pollset.fd = h.fd
h.pollset.events = C.POLLIN
h.pollset.revents = 0
_, err := C.poll(&h.pollset, 1, -1)
h.stats.Polls++
if err != nil {
return err
}
}
h.shouldReleasePacket = true
return nil
}
func (h *TPacket) pollForFirstPacket(hdr header) error {
for hdr.getStatus()&C.TP_STATUS_USER == 0 {
h.pollset.fd = h.fd
h.pollset.events = C.POLLIN
h.pollset.revents = 0
timeout := C.int(h.opts.timeout / time.Millisecond)
_, err := C.poll(&h.pollset, 1, timeout)
h.stats.Polls++
if err != nil {
return err
}
}
h.shouldReleasePacket = true
return nil
}
// Read the specified number of bytes from the input stream or die trying.
func mustRead(in io.ReadCloser, bytes []byte) int {
var offset = 0
pollfd := &C.pollfd{
fd: C.int(in.(*os.File).Fd()),
events: C.POLLIN,
revents: 0,
}
for offset < len(bytes) {
rc := C.poll(pollfd, 1, -1)
switch rc {
case 0, 1:
break
default:
log.Fatalf("Poll failed with rc = %d", rc)
}
n, err := in.Read(bytes[offset:])
offset += n
if err != nil {
log.Fatalf("Unexpected error while reading %d bytes from input: %v", len(bytes), err)
}
}
return len(bytes)
}