Using maya light linking inside mental ray shader

A source file mayaLightlink_baselambert.c
modifies the existing shader mib_illum_lambert
so that maya light linking is respected.

mayaLightlink_baselambert.mi is the shader declaration.

mentalray for maya 6.0 and later versions connect lights to the light array of the shader 
based on the light-object relationship on rendering time.
( You can check this in The exported .mi file. )
If you want to handle the light linking in the shader level,
not using this feature,
a few more extra steps should be done
besides modifying the shader code.

1. Disable the feature by adding a dynamic attribute to your shader.
   For example,

   addAttr -ln "miLightLink" -at bool mayaLightlink_mib_illum_lambert1;

   If the value of this attribute is 0, 
   mentalray for maya will not connect lights to the light array for this shader.

2. Set light mode to 2
   so that all the lights in the scene are checked against the light linking.

3. Connect lightLinker node(s) to the shader.
   For example, 
   connectAttr lightLinker1.message mib_illum_lambert_mayaLightlink1.lightLink;