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Date:	Fri, 29 May 2009 21:00:36 +0000 (GMT)
From:	Marco Atzeri <marco_atzeri AT yahoo DOT it>
Subject:	Re: R: [1.7] does LD_PRELOAD support more than 1 dll ?
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--- Ven 29/5/09, Christopher Faylor  ha scritto:

> Da: Christopher Faylor=20
> Oggetto: Re: R: [1.7] does LD_PRELOAD support more than 1 dll ?
> A: cygwin
> Data: Venerd=EC 29 maggio 2009, 18:01
> On Fri, May 29, 2009 at 05:02:01PM
> +0100, Dave Korn wrote:
> >Christopher Faylor wrote:
> >>On Fri, May 29, 2009 at 09:34:36AM +0000, Marco
> Atzeri wrote:
> >>>It seems that cygwin does not accept the space
> as separator in
> >>>LD_PRELOAD as other systems
> >>
> >>And lets just all take a moment of silence for a
> second to see if we
> >>can discern why that might be.
> >
> >The ubiquity of paths containing spaces on windows file
> systems?
>=20
> Yes, I probably never should have done it though since it
> isn't
> compatible with Linux.
>=20
> cgf
>=20

May I suggest a small note in the documentation ?
Just to help the next one to not fall in the same problem.=20
:-)

Further question, which are the limitation of=20
the LD_PRELOAD implementation in cygwin ?

Octave is built around 3 dlls

cygcheck src/octave.exe=20

  C:\cygwin2\bin\cygoctinterp.dll
    C:\cygwin2\bin\cygcruft.dll
[snip]
    C:\cygwin2\bin\cygoctave.dll
[snip]

on the other systems for the make check the program is=20
called with=20

LD_PRELOAD=3D"$liboctinterp $liboctave $libcruft" \
OCTAVE_SITE_INITFILE=3D"$top_srcdir/scripts/startup/main-rcfile" \
LD_LIBRARY_PATH=3D"$builddir/src:$builddir/liboctave:$builddir/libcruft:$LD=
_LIBRARY_PATH" \
  exec $driver "$builddir/src/octave" --no-init-path --path=3D"$LOADPATH" -=
-imag
e-path=3D"$IMAGEPATH" --doc-cache-file=3D"$DOCFILE" --info-file=3D"$INFOFIL=
E" "$@"

I replaced the space with ":" and now the program is loaded
but on the tests I obtained mainly a long list of:

  src/DLD-FUNCTIONS/chol.cc ..............................      3 [main] sh=
 4032 C:\cygwin2\bin\sh.exe: *** fatal error - error while loading shared l=
ibraries: /pub/cygports/octave/octave-3.2.0-rc4_build/src/cygoctinterp.dll:=
 cannot open shared object file: No such process

the same if I try to plot

plot(x,x)
      3 [main] sh 4052 C:\cygwin2\bin\sh.exe: *** fatal error - error while=
 loading shared libraries: /pub/cygports/octave/octave-3.2.0-rc4_build/src/=
cygoctinterp.dll: cannot open shared object file: No such process
      3 [main] gnuplot 1640 C:\cygwin2\bin\gnuplot.exe: *** fatal error - e=
rror while loading shared libraries: /pub/cygports/octave/octave-3.2.0-rc4_=
build/src/cygoctinterp.dll: cannot open shared object file: No such process

so it seems that the LD_PRELOAD is not working well=20
in case of fork.=20

It is not a critical issue as I already have implemented
 a workaround. For the test I remove the LD_PRELOAD=20
definition and add the build directories in front of the PATH.

I am just curious to understand the limitation.=20=20=20=20=20


Thanks
Marco


=20=20

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