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123 CCC
  1. DDD
  2. GGG
CCC 
   pid_t getpid(void)
   {
        printf("Hello, world!\n");
   }

    #include <sys/syscall.h>
    #include <sys/types.h>
    #include <unistd.h>
    #include <stdio.h>

   pid_t getpid(void)
   {
      printf("Hello, world!\n");
      return syscall(SYS_getpid);
   }