Re: [patch 0/6] sys_indirect RFC - sys_indirect introduction

[Davide Libenzi <davidel@xmailserver.org>]

On Sat, 30 Jun 2007, Davide Libenzi wrote:

> Think about if we had this for the latest pselect/ppoll/epoll_pwait. 
> Think about how your solution and mine would apply to that very much 
> concrete case.

This is how all those overloaded syscalls looks like, BTW:

        if (sigmask) {
                if (sigsetsize != sizeof(sigset_t))
                        return -EINVAL;
                if (copy_from_user(&ksigmask, sigmask, sizeof(ksigmask)))
                        return -EFAULT;
                sigdelsetmask(&ksigmask, sigmask(SIGKILL) | sigmask(SIGSTOP));
                sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
        }
        error = sys_XXX(...);
        if (sigmask) {
                if (error == -EINTR) {
                        memcpy(&current->saved_sigmask, &sigsaved,
                               sizeof(sigsaved));
                        set_thread_flag(TIF_RESTORE_SIGMASK);
                } else
                        sigprocmask(SIG_SETMASK, &sigsaved, NULL);
        }

How would you do that with a single shared strcture, w/out adding in all 
signal paths the knowledge of the structure?



- Davide