Re: [PATCH v3 03/16] index-helper: new daemon for caching index and related stuff

[David Turner <dturner@twopensource.com>]

On Fri, 2016-04-08 at 18:26 +0700, Duy Nguyen wrote:
> On Thu, Apr 7, 2016 at 5:11 AM, David Turner <
> dturner@twopensource.com> wrote:
> > @@ -1045,4 +1046,21 @@ struct tm *git_gmtime_r(const time_t *,
> > struct tm *);
> >  #define getc_unlocked(fh) getc(fh)
> >  #endif
> > 
> > +#ifdef __linux__
> > +#define UNIX_PATH_MAX 108
> > +#elif defined(__APPLE__) || defined(BSD)
> > +#define UNIX_PATH_MAX 104
> > +#else
> > +/*
> > + * Quoth POSIX: The size of sun_path has intentionally been left
> > + * undefined. This is because different implementations use
> > different
> > + * sizes. For example, 4.3 BSD uses a size of 108, and 4.4 BSD
> > uses a
> > + * size of 104. Since most implementations originate from BSD
> > + * versions, the size is typically in the range 92 to 108.
> > + *
> > + * Thanks, POSIX!  Super-helpful!  Hope we don't overflow any
> > buffers!
> > + */
> > +#define UNIX_PATH_MAX 92
> > +#endif
> 
> Okay. You probably want to fix unix-socket.c too, and maybe reuse
> that
> code instead of opening unix sockets manually. There's a check in
> unix_sockaddr_init() about sizeof(sun_path) but I'm not sure if it
> suffices.
> 
> BTW, it looks like you tested this on Mac. But config.mak.uname only
> enables HAVE_SHM on Linux. Should it be enabled on Mac as well at
> least?

I did not in fact test on Mac.  I should have.  And indeed I need to
change config.mak.uname. 

Also I was leaking some memory.  And had some whiny warnings.  And had
a bug around how non-blocking sockets work on Mac. 

And SHM on Macs works a bit differently than on Linux in at least two
irritating ways. 

So, uh, new version to come once I actually make it work on Mac.
Probably Monday.