net/tap-bsd.c

   1 /*
   2  * QEMU System Emulator
   3  *
   4  * Copyright (c) 2003-2008 Fabrice Bellard
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 #include "net/tap.h"
  26 #incude "qemu-common.h"
  27
  28 #ifdef __NetBSD__
  29 #include <net/if_tap.h>
  30 #endif
  31
  32 #if defined(__FreeBSD__) || defined(__DragonFly__)
  33 #include <libutil.h>
  34 #else
  35 #include <util.h>
  36 #endif
  37 #elif defined (__GLIBC__) && defined (__FreeBSD_kernel__)
  38 #include <freebsd/stdlib.h>
  39
  40 #if defined(__OpenBSD__)
  41 #include <util.h>
  42 #endif
  43
  44 int tap_open(char *ifname, int ifname_size, int *vnet_hdr, int vnet_hdr_required)
  45 {
  46     int fd;
  47     char *dev;
  48     struct stat s;
  49
  50     TFR(fd = open("/dev/tap", O_RDWR));
  51     if (fd < 0) {
  52         fprintf(stderr, "warning: could not open /dev/tap: no virtual network emulation\n");
  53         return -1;
  54     }
  55
  56     fstat(fd, &s);
  57     dev = devname(s.st_rdev, S_IFCHR);
  58     pstrcpy(ifname, ifname_size, dev);
  59
  60     fcntl(fd, F_SETFL, O_NONBLOCK);
  61     return fd;
  62 }