+ int pid, tid, ret;
+ sigset_t set;
+ __syscall(SYS_rt_sigprocmask, SIG_BLOCK, (uint64_t[]){-1}, &set, 8);
+ tid = syscall(SYS_gettid);
+ pid = syscall(SYS_getpid);
+ ret = syscall(SYS_tgkill, pid, tid, sig);
+ __syscall(SYS_rt_sigprocmask, SIG_SETMASK, &set, 0, 8);
+ return ret;