检查网络状态的方法-优快云博客

本文介绍了一种使用C语言实现的网络连接状态检查方法。通过调用socket和ioctl函数，检查设备如eth0、ath0、wlan0等是否处于UP和RUNNING状态，从而判断设备是否在线。

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/*******************************************************************************
$function_name: check_online_status
$function_decs: check online status
$function_arguments:
$function_return:
TRUE: online
FALSE: offline
$function_remark:
*******************************************************************************/
gboolean check_online_status()
{
gint ret = 0;
gint sfd;
struct ifreq ifr;

sfd = socket (PF_INET, SOCK_STREAM, 0);
if (sfd < 0)
{
SYSLOG_ERR ("BLOG: EXTR: socket err in %s/n", __func__);
return FALSE;
}

g_strlcpy (ifr.ifr_name, "eth0", 16);
ret = ioctl (sfd, SIOCGIFFLAGS, &ifr);
if (ret < 0)
{
SYSLOG_ERR ("BLOG: EXTR: ioctl err in %s/n", __func__);
}

if (((ifr.ifr_flags) & IFF_UP) && ((ifr.ifr_flags) & IFF_RUNNING))
{
goto ok;
}
else
{
g_strlcpy (ifr.ifr_name, "ath0", 16);
ret = ioctl (sfd, SIOCGIFFLAGS, &ifr);
if (ret < 0)
{
SYSLOG_ERR ("BLOG: EXTR: ioctl err in %s/n", __func__);
}

if (((ifr.ifr_flags) & IFF_UP) && ((ifr.ifr_flags) & IFF_RUNNING))
{
goto ok;
}
else
{
/* 穷举开始 */
g_strlcpy (ifr.ifr_name, "wlan0", 16);
ret = ioctl (sfd, SIOCGIFFLAGS, &ifr);
if (ret < 0)
{
SYSLOG_ERR ("BLOG: EXTR: ioctl err in %s/n", __func__);
}

if (((ifr.ifr_flags) & IFF_UP) && ((ifr.ifr_flags) & IFF_RUNNING))
{
goto ok;
}
else
{
g_strlcpy (ifr.ifr_name, "wifi0", 16);
ret = ioctl (sfd, SIOCGIFFLAGS, &ifr);
if (ret < 0)
{
SYSLOG_ERR ("BLOG: EXTR: ioctl err in %s/n", __func__);
}

if (((ifr.ifr_flags) & IFF_UP) && ((ifr.ifr_flags) & IFF_RUNNING))
{
goto ok;
}
else
{
goto err;
}
}
}
}

err:
close (sfd);
return FALSE;

ok:
close (sfd);
return TRUE;

}