#include<stdio.h>
#include<unistd.h>
#include<stdlib.h>

typedef void *(*FUNC)(void *); 

typedef struct Arg{
  int reg;
} Arg;

void* func(void *parameter){
  (void)parameter;
  printf("haha\n");
  return NULL;
}

void process_create(pid_t *pid,void *func,void *arg){
  int id = fork();
  if(id < 0){ 
    perror("fork:");
        return ;
  }else if(id == 0){
    //child
   FUNC funcback = (FUNC)func;
   funcback((Arg *)arg);
   exit(0);
  }else{
    //father
   *pid = wait(NULL);
  }
}


int main(){
  pid_t pid;
  Arg arg;
  process_create(&pid,func,&arg);
  printf("pid = %d\n",pid);
  return 0;
}