How to use c inline function in simulink model?

I have a c script in which i have an inline function 'rcvmesg((l_VarParameters_ST, MESG_VarParameters_ST)'

I need to return the same function in the generated code using simulink coder so i used S-function block(LCT) I have declared and defined the above function in header and source file but after using it in S function i get an error saying 'Token (or expression) "l_VarParameters_ST" not recognized(in"Header_RcvMESG(l_VarParameters_ST, MESG_VarParameters_ST)(double u1,double y1)". Please someone give me solution for this