LINUX_CLONE_CSIGNAL
sig = SCARG(uap, flags) & LINUX_CLONE_CSIGNAL;
if ((cl_args.exit_signal & ~(uint64_t)LINUX_CLONE_CSIGNAL) != 0){
cl_args.exit_signal & ~(uint64_t)LINUX_CLONE_CSIGNAL);
int sig = cl_args.exit_signal & LINUX_CLONE_CSIGNAL;