loopback.c

MANTIS是由科罗拉多大学开发的传感器网络嵌入式操作系统。 这是mantis的0.9.5版本的源码。

//  This file is part of MANTIS OS, Operating System
//  See http://mantis.cs.colorado.edu/
//
//  Copyright (C) 2003,2004,2005 University of Colorado, Boulder
//
//  This program is free software; you can redistribute it and/or
//  modify it under the terms of the mos license (see file LICENSE)


/*
  Project Mantis
  File:   loopback.c
  Authors: Brian Shucker
  Date:   01-16-04
  
  Implementation of the local loopback network device
  (Useful for network generality and for IPC)
*/

#include "mos.h"
#include "com.h"
#include "sem.h"
#include "mutex.h"
#include "loopback.h"

#if defined(LOOPBACK) || !defined(SCONS)

static comBuf *managed_buf;
static mos_sem_t recv_sem;
static mos_sem_t send_sem;

void com_loopback_init(void)
{
  //get initial buffer
   com_swap_bufs(IFACE_LOOPBACK, NULL, &managed_buf);

   mos_sem_init(&recv_sem, 0);
   mos_sem_init(&send_sem, 0);
   
   return;
}

uint8_t com_send_IFACE_LOOPBACK(comBuf *buf)
{
  uint8_t i;

  mos_mutex_lock(&if_send_mutexes[IFACE_LOOPBACK]);

  if(managed_buf != NULL) {
     for(i = 0; i < buf->size; i++)
	managed_buf->data[i] = buf->data[i];
     
     managed_buf->size = buf->size;
  }

  com_swap_bufs(IFACE_LOOPBACK, managed_buf, &managed_buf);
  
  mos_sem_post(&send_sem);
  mos_sem_wait(&send_sem);

  mos_mutex_unlock(&if_send_mutexes[IFACE_LOOPBACK]);

  return 0;
}

void com_ioctl_IFACE_LOOPBACK(uint8_t request, ...)
{
   return;
}

void com_mode_IFACE_LOOPBACK(uint8_t mode)
{
   return;
}

#endif