Message-ID: <34BD2B38.8F094DF5@gmx.net>
Date: Wed, 14 Jan 1998 22:16:40 +0100
From: Robert Hoehne <robert DOT hoehne AT gmx DOT net>
Organization: none provided
MIME-Version: 1.0
To: djgpp-workers AT delorie DOT com
Subject: spawn() problem
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Because I haven't the time to analize it, here now
my question:

Is it a bug or a feature of the spawn... functions, that
the called DJGPP program ignores the argv0 value of the
stub? (when spawn.. is called directly and not through
system() )?

Example: (file foo.c)

#include <stdio.h>
int main(int argc, char **argv)
{
  printf("%s\n",argv[0]);
  return 0;
}

Compile it with 

gcc -o foo.exe foo.c

and now

stubedit foo.exe argv0=bar

and now:

foo

prints

.../bar

(the dots are the directory). But when doing

bash -c foo.exe

it prints

./foo.exe

and bash uses spawnve() to call foo.exe.

I ask this, because in my last uploaded bnu281b.zip
I have made for instance ranlib.exe as a symbolic
link to ar.exe with argv0=ranlib (NOT ranlib.exe). But
when running now a makefile under bash, it fails when
running ranlib, since now ar.exe (to which ranlib.exe
points to) recognises not that it is called as ranlib
because it sees ranlib.exe and not (what I customized
in the stub) only ranlib.

I ask this also, so that I will include in the bnu281b.zip
which I have to upload to DJ (because of the missing
nm.exe :-( ) again the full executables ranlib.exe and
strip.exe and not only links to ar.exe and objcopy.exe.

Please answer me also directly, since I'm not subscribed
to djgpp-workers.

BTW: Here is another test file, which does all the steps
from above itself:

/* -------- test.c */
#include <stdio.h>
#include <process.h>

int main(int argc, char **argv)
{
  FILE *f;
  f = fopen("foo.c", "w+t");
  fprintf(f,"#include <stdio.h>\nint main(int argc, char **argv)\n");
  fprintf(f,"{printf(\"%cs\\n\",argv[0]);return 0;}\n",'%');
  fclose(f);
  system("gcc -o foo.exe foo.c");
  system("stubedit foo.exe argv0=bar");
  spawnl(P_WAIT, "foo.exe", "foo.exe", NULL);
  system("foo.exe");
  return 0;
}
/*--------*/


Robert
-- 
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* email:   Robert Hoehne <robert DOT hoehne AT gmx DOT net>     *
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