Brian Stecher
|
Re: sysconf() and invalid names
|
Brian Stecher
09/02/2009 11:08 AM
post37158
|
Re: sysconf() and invalid names
Not really.
On Wed, Sep 02, 2009 at 10:59:31AM -0400, David Sarrazin wrote:
>
> > -----Original Message-----
> > From: Brian Stecher [mailto:community-noreply@qnx.com]
> > Sent: September 2, 2009 10:52 AM
> > To: ostech-core_os
> > Subject: Re: sysconf() and invalid names
> >
> > One of the sources of values is from the typed_strings
> > section of the system page. We didn't want to disallow users
> > from defining their own private set of name/value pairs that
> > we didn't know about, so it seemed best to define all
> > possible names as valid and just unset.
>
> It should be possible for _conf_get to distinguish between unset and
> non-existent though, correct?
>
>
> >
> > Brian
> >
> > On Wed, Sep 02, 2009 at 10:35:09AM -0400, Steve Reid wrote:
> > > The code for sysconf() includes this comment:
> > >
> > > // POSIX says that sysconf returns -1 and does not set errno
> > > // when the 'name' is valid and has no limit. If 'name'
> > is invalid,
> > > // it returns -1 and sets errno to EINVAL. What, exactly, is an
> > > // invalid 'name' isn't specified. For right now, we assume that
> > > // all 'name' values are OK, and _conf_get returning -1 indicates
> > > // that 'name' is unset. Assume, for PCTS, that -1 is never valid.
> > >
> > > I would have expected that any name that isn't a defined
> > _SC_* name would be invalid. If you call sysconf() with a
> > bogus value -- I tried -377 (which I assume doesn't
> > correspond to an _SC_* name) -- the function returns -1 but
> > doesn't set errno. It sets errno to EINVAL only if you pass a
> > name of -1.
> > >
> > > Is this the right thing for this function to do?
> > >
> > >
> > >
> > > _______________________________________________
> > >
> > > OSTech
> > > http://community.qnx.com/sf/go/post37143
> > >
> >
> > --
> > Brian Stecher (bstecher@qnx.com) QNX Software Systems
> > phone: +1 (613) 591-0931 (voice) 175 Terence Matthews Cr.
> > +1 (613) 591-3579 (fax) Kanata, Ontario,
> > Canada K2M 1W8
> >
> >
> >
> > _______________________________________________
> >
> > OSTech
> > http://community.qnx.com/sf/go/post37149
> >
> >
>
>
>
> _______________________________________________
>
> OSTech
> http://community.qnx.com/sf/go/post37153
>
--
Brian Stecher (bstecher@qnx.com) QNX Software Systems
phone: +1 (613) 591-0931 (voice) 175 Terence Matthews Cr.
+1 (613) 591-3579 (fax) Kanata, Ontario, Canada K2M 1W8
|
|
|