text: #ifndef _RL_FIFO_H
  #define _RL_FIFO_H
  
  #include "rlite/port/time.h"
  
  int rl_create_signal(const char *signal_name);
  int rl_delete_signal(const char *signal_name);
  int rl_read_signal(const char *signal_name, struct timeval *timeout, char **_data, size_t *_datalen);
  int rl_write_signal(const char *signal_name, const char *data, size_t datalen);
  
  #endif
  