*BSD News Article 53175

Return to BSD News archive

Path: euryale.cc.adfa.oz.au!newshost.anu.edu.au!harbinger.cc.monash.edu.au!msunews!agate!howland.reston.ans.net!swrinde!elroy.jpl.nasa.gov!decwrl!purdue!news.bu.edu!dartvax.dartmouth.edu!usenet
From: Ting Cai <tcai>
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Help on network status
Date: 24 Oct 1995 00:09:07 GMT
Organization: Dartmouth College, Hanover, NH, USA
Lines: 107
Message-ID: <46har3$jbl@dartvax.dartmouth.edu>
NNTP-Posting-Host: yosemite.cs.dartmouth.edu
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (X11; I; OSF1 V3.2 alpha)
To: tcai@cs.dartmouth.edu
X-URL: news:comp.unix.bsd.freebsd.misc/9785-9884#46g6c7$6tt@ida.interface-business.de

Hi! All: 

I am trying to find out an easy and quick way to tell if the network is up or
down.I found that ioctl could retrieve the 'ifflags' which contains the
infomation on if the network is up, but after hours of trying, ioctl still
returns error: 

ioctl: Device not configured

Here is the little program I wrote: 

  struct ifreq data; 
  struct sockaddr_in address;

  size = sizeof(struct sockaddr_in); 

  if ((id = socket(PF_INET, SOCK_STREAM, 0)) < 0) {
    perror("socket");
    exit(1);
  }

  bzero ((char *) &address, sizeof(address));
  address.sin_family = PF_INET;
  address.sin_port = htons(SERV_TCP_PORT);
  address.sin_addr.s_addr = htonl (INADDR_ANY); 

  if (bind(id,(struct sockaddr *) &address, size)) {
    perror("bind");
    exit(1);
  }

  if ( ioctl(id,SIOCGIFFLAGS,&data ) < 0) {
    perror("ioctl");
    exit(1); 
  }

/*************  struct ifreq data; 
  struct sockaddr_in address;

  size = sizeof(struct sockaddr_in); 

  if ((id = socket(PF_INET, SOCK_STREAM, 0)) < 0) {
    perror("socket");
    exit(1);
  }

  bzero ((char *) &address, sizeof(address));
  address.sin_family = PF_INET;
  address.sin_port = htons(SERV_TCP_PORT);
  address.sin_addr.s_addr = htonl (INADDR_ANY); 

  if (bind(id,(struct sockaddr *) &address, size)) {
    perror("bind");
    exit(1);
  }

  if ( ioctl(id,SIOCGIFFLAGS,&data ) < 0) {
    perror("ioctl");
    exit(1); 
  }  struct ifreq data; 
  struct sockaddr_in address;

  size = sizeof(struct sockaddr_in); 

  if ((id = socket(PF_INET, SOCK_STREAM, 0)) < 0) {
    perror("socket");
    exit(1);
  }

  bzero ((char *) &address, sizeof(address));
  address.sin_family = PF_INET;
  address.sin_port = htons(SERV_TCP_PORT);
  address.sin_addr.s_addr = htonl (INADDR_ANY); 

  if (bind(id,(struct sockaddr *) &address, size)) {
    perror("bind");
    exit(1);
  }

  if ( ioctl(id,SIOCGIFFLAGS,&data ) < 0) {
    perror("ioctl");
    exit(1); 
  }


/*************** end of program ************************************/

Do you have some suggestions? or any other way to get the network status
information?

Many thanks to you all. 

Ting Cai

at Dartmouth College

email: tcai@cs.dartmouth.edu


*****************/


-- 
Ting

tcai@cs.dartmouth.edu