Hi Jens,
> +static pid_t fork_thread(int (*fn)(void *), void *arg)
> +{
> + unsigned long flags = CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|
> + CLONE_IO|SIGCHLD;
> + struct kernel_clone_args args = {
> + .flags = ((lower_32_bits(flags) | CLONE_VM |
> + CLONE_UNTRACED) & ~CSIGNAL),
> + .exit_signal = (lower_32_bits(flags) & CSIGNAL),
> + .stack = (unsigned long)fn,
> + .stack_size = (unsigned long)arg,
> + };
> +
> + return kernel_clone(&args);
> +}
Can you please explain why CLONE_SIGHAND is used here?
Will the userspace signal handlers executed from the kernel thread?
Will SIGCHLD be posted to the userspace signal handlers in a userspace
process? Will wait() from userspace see the exit of a thread?
Thanks!
metze
