From owner-freebsd-questions  Thu Nov 18 14:28:22 1999
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Date: Thu, 18 Nov 1999 14:54:21 -0800 (PST)
From: Alfred Perlstein <bright@wintelcom.net>
To: Greg Lehey <grog@lemis.com>
Cc: rover@lglobus.ru, freebsd-questions@FreeBSD.ORG
Subject: Re: Is there correct way for program to read from itself?
In-Reply-To: <19991118172315.02758@mojave.sitaranetworks.com>
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On Thu, 18 Nov 1999, Greg Lehey wrote:

> On Friday, 19 November 1999 at  0:27:59 +0300, Oleg V. Volkov wrote:
> > On Thu, Nov 18, 1999 at 03:47:36PM -0500, Greg Lehey wrote:
> >> On Thursday, 18 November 1999 at 23:28:46 +0300, Oleg V. Volkov wrote:
> >>> On Thu, Nov 18, 1999 at 03:23:24PM -0500, Greg Lehey wrote:
> >>>>>>> Is there correct way for porgram to read from it's own file?
> >>>>>> I'm not sure I understand.  What do you mean by "it's own file"?
> >>>>>> If you mean the object file, sure.  Where's the problem?
> >>>>> I mean this situation:
> >>>>> I have some program /usr/local/bin/someprog. Is there a way for it
> >>>>> to read from itself (from /usr/local/bin/someprog).
> >>>> Sure, that's what I said.  What do you expect to find?
> >>> Could you give me short example?
> >> OK, here's copyme.c:
> >>
> >> #include <fcntl.h>
> >> #include <stdio.h>
> >> #include <string.h>
> >> #include <sys/stat.h>
> >>
> >> extern int errno;
> >>
> >> main (int argc, char *argv [])
> >> {
> > [skip]
> >>   }
> >>
> >> And here's what happens when I run it:
> >>
> >>  $ copyme foo
> >>  $ cmp copyme foo
> >>  $ ls -l copyme foo
> >>  -rwxrwxrwx  1 grog  eng  4197 Nov 18 15:44 copyme
> >>  -r--------  1 grog  eng  4197 Nov 18 15:44 foo
> >>  $
> >>
> >> Not much use, is it?  Was that your class assignment?
> >
> > Heh, and now put it into PATH...
> > and
> >
> > $ copyme foo
> > Can't open copyme: No such file or directory
> >
> > Everything is not that easy.
> 
> That wasn't the question.  But it can be fixed.  How about you doing
> it?

I think procfs would be even more helpful (unless the 'file' is still
done, or is it?)  You guys should have gotten my profs suggestion
but someone obviously dropped cc lines.  *sigh*

And Greg is definetly right, you should be able to look around to
solve this problem, if the problem is then PATH, then searching
the path is what you need to do, but I still think procfs offers
what you need.

man 5 procfs.

-Alfred



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