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Date:	Fri, 10 Sep 2004 00:38:31 -0400 (EDT)
From:	Igor Pechtchanski <pechtcha AT cs DOT nyu DOT edu>
Reply-To:	cygwin AT cygwin DOT com
To:	cygwin AT cygwin DOT com
Subject:	Cygwin 1.5.11: execv doesn't set argv[0] on Windows programs
Message-ID:	<Pine.GSO.4.61.0409100001520.2335@slinky.cs.nyu.edu>
MIME-Version:	1.0
X-Scanned-By:	MIMEDefang 2.39

Hi,

I'm getting the following behavior consistently:

$ bash -c 'exec -a KKKK java -h' 2>&1 | egrep 'options?]'
Usage: java.exe [-options] class [args...]
   or  java.exe [-jar] [-options] jarfile [args...]
$

but

$ bash -c 'exec -a KKKK bash --help' 2>&1 | egrep 'options?]'
Usage:  KKKK [GNU long option] [option] ...
        KKKK [GNU long option] [option] script-file ...
$

In other words, invoking a Cygwin program sets argv[0] correctly, but
invoking a Windows program doesn't.  Interestingly enough, using the MinGW
execv works properly:

$ cat ex.c
#include <stdlib.h>
int main(int ac, char *av[]) {
  char const *args[] = { "KKKK", "-h", NULL };
  return execv("c:/Program Files/IBM/Java14/bin/java", args);
}
$ make -W ex.c CC="gcc -mno-cygwin" ex
gcc -mno-cygwin     ex.c   -o ex
$ ./ex 2>&1 | egrep 'options?]'
Usage: KKKK [-options] class [args...]
   or  KKKK [-jar] [-options] jarfile [args...]
$ make -W ex.c ex
gcc     ex.c   -o ex
$ ./ex 2>&1 | egrep 'options?]'
Usage: java.exe [-options] class [args...]
   or  java.exe [-jar] [-options] jarfile [args...]
$ uname -a
CYGWIN_NT-5.1 pechtcha 1.5.12(0.116/4/2) 2004-09-07 15:07 i686 unknown unknown Cygwin

(yes, a self-built DLL from CVS, but the same problem occurs with 1.5.10).

I have a nagging suspicion that the culprit is somewhere in spawn_guts(),
and will poke some more at it unless someone knows off-hand where the
problem is.
	Igor
-- 
				http://cs.nyu.edu/~pechtcha/
      |\      _,,,---,,_		pechtcha AT cs DOT nyu DOT edu
ZZZzz /,`.-'`'    -.  ;-;;,_		igor AT watson DOT ibm DOT com
     |,4-  ) )-,_. ,\ (  `'-'		Igor Pechtchanski, Ph.D.
    '---''(_/--'  `-'\_) fL	a.k.a JaguaR-R-R-r-r-r-.-.-.  Meow!

"Happiness lies in being privileged to work hard for long hours in doing
whatever you think is worth doing."  -- Dr. Jubal Harshaw

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