Re: [libvirt] [RFC] Power Hypervisor Libvirt support

[Eduardo Otubo <otubo linux vnet ibm com>]

Hello DV, 

I agree with your suggestions and everything is fixed now. But I would
like to discuss some points.

> 
> > +    while (channel && channel_is_open(channel)) {
> > +        ret = channel_read(channel, readbuf, 0, 0);
> > +        if (ret < 0) {
> > +            (*exit_status) = SSH_CHANNEL_READ_ERR;
> > +            break;
> > +        }
> > +
> > +        if (ret == 0) {
> > +            channel_send_eof(channel);
> > +            while(channel_get_exit_status(channel) == -1){
> > +                channel_poll(channel,0);
> > +                usleep(50);
> > +            }
> 
>    It's always a bit nasty to sleep like that. Is there really now way
> to use something like poll or select instead ? In average you're gonna
> be waken up multiple time while waiting for your answer while the kernel
> could instead wake you up exactly when you have the data.

This was a libssh issue This was the only way I could make it work. But
now the libssh is fixed and this function is a little different -
http://pastebin.com/fbf84426

> > +
> > +/* return the lpar_id given a name and a managed system name */
> > +static int
> > +phypGetLparID(SSH_SESSION * ssh_session, const char *managed_system,
> > +              const char *name)
> > +{
> > +    int exit_status = 0;
> > +    virBuffer cmd = VIR_BUFFER_INITIALIZER;
> > +
> > +    virBufferVSprintf(&cmd,
> > +                      "lssyscfg -r lpar -m %s --filter lpar_names=%s -F lpar_id",
> > +                      managed_system, name);
> > +    const char *tex_ret =
> > +        __inner_exec_command(ssh_session, virBufferContentAndReset(&cmd),
> > +                             &exit_status);
> > +
> > +    virBufferContentAndReset(&cmd);
> 
>    Huh ? you're supposed to get the resulting char *, and then free it
>    later once you're done with the data. Here youre just leaking memory
>    I'm afraid
> 
>  same thing for most of the commands in that file.

Here, I just would like to free the Buffer, and this was the best way I
find since I couldn't find any better function to manipulate this. How
do I simply free a buffer using the internal virBuffer* API?

Thanks for the help,

-- 
Eduardo Otubo
Software Engineer
Linux Technology Center
IBM Systems & Technology Group
Mobile: +55 19 8135 0885 
otubo linux vnet ibm com