Date: Wed, 9 Nov 2011 17:52:05 -0800 From: Garrett Cooper <yanegomi@gmail.com> To: Peter Wemm <peter@wemm.org> Cc: Giovanni Trematerra <gianni@freebsd.org>, freebsd-arch@freebsd.org Subject: Re: deprecated TIOCSPGRP and TIOCGPGRP ioctl command Message-ID: <D2F25708-5E0B-4270-83F0-79286C5A581A@gmail.com> In-Reply-To: <CAGE5yCor9c%2Bb7hZaF8NLdxc2F8PPfi0kTZFLXY5nvA%2Bbm1Ytuw@mail.gmail.com> References: <CACfq09210zdar=%2BM40gLoVtZnwLda88T1FJBbLXiy9e3t8-9NQ@mail.gmail.com> <CAGE5yCor9c%2Bb7hZaF8NLdxc2F8PPfi0kTZFLXY5nvA%2Bbm1Ytuw@mail.gmail.com>
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On Nov 9, 2011, at 4:49 PM, Peter Wemm wrote:
> On Wed, Nov 9, 2011 at 3:39 PM, Giovanni Trematerra <gianni@freebsd.org> wrote:
>> Are they deprecated enough to be removed, now?
>> FYI FIFO doesn't support them.
>>
>> --
>> Gianni
>>
>> =================================
>> --- sys/kern/sys_pipe.c (revision 227233)
>> +++ sys/kern/sys_pipe.c (working copy)
>> @@ -1304,17 +1304,6 @@ pipe_ioctl(fp, cmd, data, active_cred, td)
>> *(int *)data = fgetown(&mpipe->pipe_sigio);
>> break;
>>
>> - /* This is deprecated, FIOSETOWN should be used instead. */
>> - case TIOCSPGRP:
>> - PIPE_UNLOCK(mpipe);
>> - error = fsetown(-(*(int *)data), &mpipe->pipe_sigio);
>> - goto out_unlocked;
>> -
>> - /* This is deprecated, FIOGETOWN should be used instead. */
>> - case TIOCGPGRP:
>> - *(int *)data = -fgetown(&mpipe->pipe_sigio);
>> - break;
>> -
>> default:
>> error = ENOTTY;
>
> Be very very careful with this. It's part of the classic BSD job
> control API. It would be wise to survey whether any ports shells use
> this.
>
> You might also want to consider things like this in libc:
> int
> tcsetpgrp(int fd, pid_t pgrp)
> {
> int s;
>
> s = pgrp;
> return (_ioctl(fd, TIOCSPGRP, &s));
> }
> Our own libc code uses this, albeit on an API intended to be used on a tty.
>
> The shell I'd be most concerned about is csh/tcsh in our tree. It has
> quite an #ifdef legacy layer and I couldn't convince myself it wasn't
> using this indirectly (or the tc* functions) on pipes.
>
> It might also be an idea to see if the linux compat layer can be
> switched over to using the newer API.
Move to a compat library perhaps?
-Garrett
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