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Date: 23 Oct 95 20:27:15 EDT
From: Ting.Cai@Dartmouth.EDU (Ting Cai)
Subject: Help on network status
To: freebsd-questions@freebsd.org
Sender: owner-questions@freebsd.org
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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); 
  }

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