how to visit the variable "bs" in pmat of preconditioner

[Yujie]

hi, everyone

now, I want to use Hypre package via
PETSc in third package. I need to visit the variable "bs" in Mat struct. In
hypre.c, this variable may let BoomerAMG know the block size of Mat. The
code is as follows:

127: /* special case for BoomerAMG */
128: if (jac->setup == HYPRE_BoomerAMGSetup) {
129: MatGetBlockSize(pc->pmat,&bs);
130: if (bs > 1) {
131: HYPRE_BoomerAMGSetNumFunctions(jac->hsolver,bs);
132: }
133: };

However, I can't visit this variable. Now, I have get the pointer of PC I
use. I can't visit the variable pmat in my code. I can't find any function
to realize this function from PETSc manual.
Could you give me some advice about how to do?

Merry X'mas!

Regards,
Yujie
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