text: #ifndef SYS_MSG_H
  #define SYS_MSG_H 1
  
  #include "sys/proc.h"
  #include "api/message.h"
  
  message_t *message_prepare(size_t s);
  int message_release(message_t *msg);
  
  int message_send(message_t *msg, pid_t pid);
  message_t *message_recv();
  
  #endif
  