Date: Fri, 19 Nov 1999 00:27:59 +0300 From: "Oleg V. Volkov" <rover@lglobus.ru> To: freebsd-questions@freebsd.org Subject: Re: Is there correct way for program to read from itself? Message-ID: <19991119002759.B63288@fly.lglobus.ru> In-Reply-To: <19991118154736.22915@mojave.sitaranetworks.com> References: <19991118065815.B89755@fly.lglobus.ru> <19991118102421.09370@mojave.sitaranetworks.com> <19991118223426.A62913@fly.lglobus.ru> <19991118152324.37840@mojave.sitaranetworks.com> <19991118232846.A63288@fly.lglobus.ru> <19991118154736.22915@mojave.sitaranetworks.com>
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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.
--
Oleg V. Volkov aka Rover EH: LCM Rover
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