harmony-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Leo Li" <liyilei1...@gmail.com>
Subject Re: [classlib][luni]Runtime.exec fails on Linux
Date Mon, 16 Oct 2006 09:03:38 GMT
 Thank you.
 I have just run it on drlvm of unbuntu, it works.
 What a qurious problem!


On 10/16/06, Alexey Varlamov <alexey.v.varlamov@gmail.com> wrote:
>
> Both DRLVM and J9 works for me (SUSE9).
>
> --
> Alexey
>
> 2006/10/16, Leo Li <liyilei1979@gmail.com>:
> > Hi, all:
> >     The harmony Runtime.exec fails on Linux with ENOMEM.
> >     Here is the testcase:
> >
> > public class Exec {
> >    public static void main(String[] args) throws Exception {
> >
> >       Runtime.getRuntime().exec("ls");    }
> > }
> >
> >    I have tried it on RedHat Enterprise 4 and Unbuntu, both get ENOMEM
> in
> > native code.
> >
> >    After digging into it, I found it fails in procimpl.c, line 135:
> >
> >        grdpid = fork ();
> >
> >    If the call to fork is changed to vfork, the testcase will pass but
> > still get exitcode = 1 which indicates that some error has happened. The
> > difference between fork and vfork is just whether page tables is copied
> to
> > child process or not. But I do not think it is the main cause. Besides,
> > vfork has become outdated since it main usage is supplied by fork with
> > copy-on-write function implemented in modern linux kernel. Furthermore,
> > vfork is also not so safe as fork. So I do not think it is the accepted
> way
> > to solve the problem.
> >
> >   I will try whether it can be reproduced on drlvm of linux since I am
> not
> > sure whether it is relevent to VM or classlib. If any drlvm man can tell
> me
> > the result, it can avoid my trouble to build it on linux. :)
> >
> >
> >
> >
> >
> >
> >
> > --
> > Leo Li
> > China Software Development Lab, IBM
> >
> >
>
> ---------------------------------------------------------------------
> Terms of use : http://incubator.apache.org/harmony/mailing.html
> To unsubscribe, e-mail: harmony-dev-unsubscribe@incubator.apache.org
> For additional commands, e-mail: harmony-dev-help@incubator.apache.org
>
>


-- 
Leo Li
China Software Development Lab, IBM

Mime
  • Unnamed multipart/alternative (inline, None, 0 bytes)
View raw message