linux-kernel - Re: [patch 0/6] sys_indirect RFC

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Date:	Sat, 30 Jun 2007 15:32:33 -0700 (PDT)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	Ulrich Drepper <drepper@...il.com>
cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [patch 0/6] sys_indirect RFC - sys_indirect introduction

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


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