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Re: "here strings" and tmpfiles


From: konsolebox
Subject: Re: "here strings" and tmpfiles
Date: Thu, 11 Apr 2019 05:31:14 +0800

On Thu, Apr 11, 2019, 4:45 AM Chet Ramey <address@hidden> wrote:

> On 4/10/19 4:33 PM, konsolebox wrote:
> > On Wed, Apr 10, 2019 at 11:15 PM Chet Ramey <address@hidden> wrote:
> >> If we're going to go off into hypotheticals and speculation, it would be
> >> nice if memfd_create were available universally.
> >
> > I see many parts in lib/* that adapts to available system features
> > like mmap and MAP_ANONYMOUS.  I don't see why memfd_create should be
> > an exception.  Using a volatile file is much better than forking, and
> > this only requires a one-time implementation of a wrapper library
> > function that returns -1 if the feature is not available in the
> > system.  It should be easy to integrate with the current code since it
> > returns an fd.
>
> It has slightly inconvenient semantics, in that you can't open it more
> than once, and if you can't do that, you can't convert it from read-write
> to readonly.


Perhaps it can be reopened via /dev/fd.


--
konsolebox


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