Raise a signal on the current process

[mk12]

A common pattern with signals like SIGHUP, SIGINT, and SIGTERM is to perform some cleanup and then invoke the default handler. For example, in C:

static void signal_handler(int signum) {
    do_cleanup();
    signal(signum, SIG_DFL);
    raise(signum);
}

This is different from calling exit yourself. For one thing, exit is not async-signal-safe, so you'd actually need to call _exit or abort. But more importantly, the parent process (e.g. the shell) can tell from wait if a child was killed by a signal or exited normally. So even if you mimic the exit code:

await Deno.signal(sig);
Deno.exit(128 + sig);

it will not be the same as invoking the default handler.

You can call Deno.kill(Deno.pid, sig), but this requires the very broad permission --allow-run. It would be better if there was a Deno.raise(sig) function that did not require any permission.

[lucacasonato]

Is there a node equivalent for this? We could consider not requiring the --allow-run permission for killing the current pid.

[lucacasonato]

Duplicate of #8299.