IP Networking

hi all
this is the code to know wether the net on or off


#include <stdio.h>
#include <unistd.h>
#include <netdb.h>
#include <gtk/gtk.h>
#include <stdlib.h>
#include <string.h>

int can_resolve_host (const char *host)
{
struct hostent *h = NULL;
h = gethostbyname (host);

if (h == NULL)
{
return -1;
}
else
{
return 0;
}
}

int netstate()
{
FILE* FD;
char buf[256] = {0};
char* linkstatus = NULL;

FD = popen ("/sbin/mii-tool", "r");

if (FD)
{
fgets (buf, sizeof (buf), FD);
buf[strlen(buf) - 1] = '\0';
linkstatus = strstr (buf, "ok");
}

pclose (FD);
if ((linkstatus) && (0 == strcmp (linkstatus, "ok")))
{
if (can_resolve_host ("axillsearch.com") == -1)
{
printf ("Failed to reach axillsearch.com\n");
}
else
{
printf ("Successfully reached axillsearch.com\n");
}
}
else
fprintf (stderr, "%s(): Network connectivity not available \n", __func__);
printf ("U r net is down \n");
return -1;

}

int
main (int argc, char *argv[])

{

int i;
i=gtk_timeout_add(8000,
(GtkFunction) netstate,
NULL);

gtk_main ();
return 0;
}
save it has one.c
and compile
gcc one.c -o one `pkg-config gtk+-2.0 --cflags --libs`


it is working successfully
when
1.net deactivate or activate
2.cable unplugged or plugged

but it is not working when the server is down

how can i do when the server is down

when the serveris down(main servers)
it has to show the message like
"U r net is down \n"

if any help
cheers

what meaning do you put "when the server is down" ? Machine is shutted down ? Do you have any requirement on which language to write this ? Does it has to be application/deamon or shell script ran via crontab ? Shed some light please.

thank for your replay

its a daemon prosess
i wanna run the program continuosly.

it is working fine.

but when the server is down it is taking some time.

why dont you run the program once, so that you can know.
i think you understand my problem.

please help me.

ping -c2 ip_address
and check the status of the ping command by echo $?
if 0 echoed then server is alive otherwise server is down

rest u can check man ping