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/*
Copyright (C) 2000 Free Software Foundation, Inc.
Written by Marcus Brinkmann.
This file is part of the GNU Hurd.
The GNU Hurd is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2, or (at
your option) any later version.
The GNU Hurd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA. */
#include "pfinet.h"
#include <linux/netdevice.h>
#include <linux/notifier.h>
#include "pfinet_S.h"
#include <netinet/in.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include <mach/notify.h>
#include <sys/mman.h>
#include <sys/ioctl.h>
#include <net/if.h>
extern int dev_ifconf(char *arg);
/* Return the list of devices in the format provided by SIOCGIFCONF
in IFR, but don't return more then AMOUNT bytes. If AMOUNT is
negative, there is no limit. */
error_t
S_pfinet_siocgifconf (io_t port,
int amount,
char **ifr,
mach_msg_type_number_t *len)
{
error_t err = 0;
struct ifconf ifc;
__mutex_lock (&global_lock);
if (amount < 0)
{
/* Get the needed buffer length. */
ifc.ifc_buf = NULL;
ifc.ifc_len = 0;
err = dev_ifconf ((char *) &ifc);
if (err)
{
__mutex_unlock (&global_lock);
return -err;
}
amount = ifc.ifc_len;
}
else
ifc.ifc_len = amount;
if (amount > 0)
{
/* Possibly allocate a new buffer. */
if (*len < amount)
ifc.ifc_buf = (char *) mmap (0, amount, PROT_READ|PROT_WRITE,
MAP_ANON, 0, 0);
else
ifc.ifc_buf = *ifr;
err = dev_ifconf ((char *) &ifc);
}
if (err)
{
*len = 0;
if (ifc.ifc_buf != *ifr)
munmap (ifc.ifc_buf, amount);
}
else
{
*len = ifc.ifc_len;
*ifr = ifc.ifc_buf;
}
__mutex_unlock (&global_lock);
return err;
}
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