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From:	Krzysztof Duleba <krzysan AT skrzynka DOT pl>
Subject:	Re: .exe magic doesn't work with gprof
Date:	Wed, 20 Jul 2005 16:04:54 +0200
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Message-ID:	<dbllm5$6gn$1@sea.gmane.org>
References:	<dbkpm1$oaf$1 AT sea DOT gmane DOT org> <SERRANOf0YwXtNfsSJY00000625 AT SERRANO DOT CAM DOT ARTIMI DOT COM>
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Dave Korn wrote:

>>.exe magic doesn't work with gprof. Any ideas why?
> 
>   And indeed, it doesn't work the other way round... [carrying on from your
> testcase:]
> 
> dk AT mace /artimi/firmware/test> mv foo.exe foo
> dk AT mace /artimi/firmware/test> rm gmon.out
> dk AT mace /artimi/firmware/test> ./foo
> dk AT mace /artimi/firmware/test> gprof foo.exe
> foo.exe: No such file or directory
> dk AT mace /artimi/firmware/test> gprof foo
> Flat profile:
> 
> 
>   Exe magic is not applied to command line arguments by the shell, otherwise
> it might mangle plaintext or options: exe magic is applied when an
> application tries to open a file that doesn't exist.  gprof doesn't open foo
> or foo.exe; it opens gmon.out.  The exe magic would have to modify the
> contents of gmon.out in accord with gprof's internal binary format to make a
> difference here.  

But how does gprof know that foo doesn't exist? It has to open or stat it. 
I thought that both open and stat calls support exe magic.

Krzysztof Duleba


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