function - Call flow for the code - C -


I'm looking for a microcontroller in some code. I think mostly code, but this piece of code is bothering me, including the relevant definitions for the data types used. I have replaced the function and variable names for ease. I 

  define typefif zero (* some_type) (zero * p); some_type some_arr [COUNT] = {NULL,}; Zero init (zero) {first_function (and second_function); } Zero first_function (some_type cb) {if (some_arr_count & lt; COUNT) {some_arr [some_arr_count ++] = cb; }} void second_function (Zero * P) {another_type * req; Req = (another_type *); p; // some other code goes here}   
  1. What does this typingfiff mean?   
  typed zero (* some_type) (zero * P);   
 The init () function is called only once and there is only one line of code in it.  
  2. What does this line do?   
  first_ work (& second_function);   
 I searched the entire project code for the second task, and this only shows the only place in addition to the function definition.  
  3. Then how does one get another job?    
 
 
     
  1.  
     the following  typedef   
      typedef zero (* some_type) (zero * p);  void () (zero *)         
     As an indicator for  some_type  will define. > 
  2.  
     The following statement  
      first_ work (& second_function);   
     A function call,  and other work / <> code, which is the address of  second_function , it is argued that  first_function () .   
  3.  
     The function  another function  can be called this way  
      some_arr [some_arr_count] (p);   
      some_arr [some_arr_count]  is a function indicator  second_function , which is assigned in  first_function , and The argument of  p  is the function of  second_function , which is an indicator for  zero .

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