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[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Demo/] [uIP_Demo_Rowley_ARM7/] [uip/] [tapdev.c] - Blame information for rev 609

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Line No. Rev Author Line
1 583 jeremybenn
/*
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 * Copyright (c) 2001, Swedish Institute of Computer Science.
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer.
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 *
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
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 *    documentation and/or other materials provided with the distribution.
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 *
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 * 3. Neither the name of the Institute nor the names of its contributors
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 *    may be used to endorse or promote products derived from this software
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 *    without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 * SUCH DAMAGE.
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 *
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 * Author: Adam Dunkels <adam@sics.se>
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 *
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 * $Id: tapdev.c 2 2011-07-17 20:13:17Z filepang@gmail.com $
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 */
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#include <fcntl.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include <sys/uio.h>
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#include <sys/socket.h>
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#ifdef linux
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#include <sys/ioctl.h>
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#include <linux/if.h>
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#include <linux/if_tun.h>
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#define DEVTAP "/dev/net/tun"
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#else  /* linux */
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#define DEVTAP "/dev/tap0"
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#endif /* linux */
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#include "uip.h"
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static int fd;
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static unsigned long lasttime;
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static struct timezone tz;
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/*-----------------------------------------------------------------------------------*/
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void
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tapdev_init(void)
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{
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  char buf[1024];
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  fd = open(DEVTAP, O_RDWR);
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  if(fd == -1) {
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    perror("tapdev: tapdev_init: open");
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    exit(1);
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  }
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#ifdef linux
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  {
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    struct ifreq ifr;
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    memset(&ifr, 0, sizeof(ifr));
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    ifr.ifr_flags = IFF_TAP|IFF_NO_PI;
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    if (ioctl(fd, TUNSETIFF, (void *) &ifr) < 0) {
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      perror(buf);
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      exit(1);
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    }
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  }
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#endif /* Linux */
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  snprintf(buf, sizeof(buf), "ifconfig tap0 inet %d.%d.%d.%d",
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           UIP_DRIPADDR0, UIP_DRIPADDR1, UIP_DRIPADDR2, UIP_DRIPADDR3);
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  system(buf);
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  lasttime = 0;
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}
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/*-----------------------------------------------------------------------------------*/
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unsigned int
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tapdev_read(void)
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{
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  fd_set fdset;
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  struct timeval tv, now;
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  int ret;
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  if(lasttime >= 500000) {
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    lasttime = 0;
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    return 0;
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  }
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  tv.tv_sec = 0;
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  tv.tv_usec = 500000 - lasttime;
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  FD_ZERO(&fdset);
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  FD_SET(fd, &fdset);
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  gettimeofday(&now, &tz);
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  ret = select(fd + 1, &fdset, NULL, NULL, &tv);
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  if(ret == 0) {
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    lasttime = 0;
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    return 0;
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  }
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  ret = read(fd, uip_buf, UIP_BUFSIZE);
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  if(ret == -1) {
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    perror("tap_dev: tapdev_read: read");
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  }
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  gettimeofday(&tv, &tz);
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  lasttime += (tv.tv_sec - now.tv_sec) * 1000000 + (tv.tv_usec - now.tv_usec);
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  return ret;
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}
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/*-----------------------------------------------------------------------------------*/
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void
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tapdev_send(void)
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{
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  int ret;
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  struct iovec iov[2];
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#ifdef linux
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  {
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    char tmpbuf[UIP_BUFSIZE];
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    int i;
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    for(i = 0; i < 40 + UIP_LLH_LEN; i++) {
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      tmpbuf[i] = uip_buf[i];
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    }
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    for(; i < uip_len; i++) {
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      tmpbuf[i] = uip_appdata[i - 40 - UIP_LLH_LEN];
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    }
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    ret = write(fd, tmpbuf, uip_len);
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  }
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#else 
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  if(uip_len < 40 + UIP_LLH_LEN) {
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    ret = write(fd, uip_buf, uip_len + UIP_LLH_LEN);
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  } else {
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    iov[0].iov_base = uip_buf;
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    iov[0].iov_len = 40 + UIP_LLH_LEN;
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    iov[1].iov_base = (char *)uip_appdata;
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    iov[1].iov_len = uip_len - (40 + UIP_LLH_LEN);
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    ret = writev(fd, iov, 2);
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  }
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#endif
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  if(ret == -1) {
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    perror("tap_dev: tapdev_send: writev");
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    exit(1);
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  }
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}
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/*-----------------------------------------------------------------------------------*/

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