[PATCH 08/12] Add lvm_errno(), lvm_strerror, lvm_vg_mode.

[Alasdair G Kergon <agk@redhat.com>]

On Thu, Feb 12, 2009 at 02:30:37PM -0500, Dave Wysochanski wrote:
> Create struct lib_context to store lvm_errno field as well as cmd_context.
> Create error APIs - lvm_errno, lvm_strerror.

As we discussed on the call last week, let't see first if we can get an error
number and messages integrated into the existing log_error() reporting
mechanism.

> +int lvm_errno(lvm_handle_t libh)
> +{
> +	return libh->lvm_errno;
> +}

Eventually, yes, but as we discussed last week, a static global variable
is likely to be the quickest way to get this working until libh is
available at all levels of the stack.

> +char *lvm_strerror(lvm_handle_t libh)
> +{
> +	return strerror(libh->lvm_errno);
> +}

No need for a wrapper around strerror - call it directly!

What we should do though is store the specific error messages issued
and provide a way to return them all in one go.
Again, this is likely to be a simple multi-line string for now, that gets
cleared on each new library call.

Alasdair
-- 
agk at redhat.com