forkBail

fn forkBail(fd: posix.fd_t, err: ForkBailError) noreturn {
    writeIntFd(fd, @as(ErrInt, @intFromError(err))) catch {};
    // If we're linking libc, some naughty applications may have registered atexit handlers
    // which we really do not want to run in the fork child. I caught LLVM doing this and
    // it caused a deadlock instead of doing an exit syscall. In the words of Avril Lavigne,
    // "Why'd you have to go and make things so complicated?"
    if (builtin.link_libc) {
        // The `_exit` function does nothing but make the exit syscall, unlike `exit`.
        std.c._exit(1);
    } else if (native_os == .linux and !builtin.single_threaded) {
        std.os.linux.exit_group(1);
    } else {
        posix.system.exit(1);
    }
}