I suggest you start top in batch mode and with the number of iterations set to 1. This way you take a a quick snapshot of things and save it to a file.

You need to format your output using printf instead of using print.

Add the pam namspace declaration in where the prism namespace is declared.

Each method has its strengths and weaknesses.

The null pointer constant (NULL) is guaranteed (by the compiler) not to point to any real object. It never points to "location zero in memory". Likewise the constant NULL is guaranteed to be 0.