BPF_FILDROP_CAPTURE
int flag = 1, fildrop = BPF_FILDROP_CAPTURE;
case BPF_FILDROP_CAPTURE:
int fildrop = BPF_FILDROP_CAPTURE;
flag = BPF_FILDROP_CAPTURE;
Bflag = BPF_FILDROP_CAPTURE;