C language linux network card detection compact version
- 2020-06-07 04:59:08
- OfStack
The example of this paper is to share the C language linux network card detection code for your reference, the specific content is as follows
Universal network, getifaddrs can greatly reduce the amount of coding, C language to achieve the same effect of linux network card detection - improved version.
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <linux/if.h>
#include <ifaddrs.h>
#include <arpa/inet.h>
int c_ifaddrs_netlink_status(const char *if_name )
{
struct ifaddrs *ifa = NULL, *ifList;
if (getifaddrs(&ifList) < 0)
{
return -1;
}
for (ifa = ifList; ifa != NULL; ifa = ifa->ifa_next)
{
if(ifa->ifa_addr->sa_family == AF_INET)
{
if(strcmp(ifa->ifa_name, if_name) ==0)
{
if(!(ifa->ifa_flags & IFF_UP))
{
printf("DEVICE_DOWN\r\n");
freeifaddrs(ifList);
return 1;
}
if(!(ifa->ifa_flags & IFF_RUNNING))
{
printf("DEVICE_UNPLUGGED\r\n");
freeifaddrs(ifList);
return 2;
}
printf("DEVICE_LINKED\r\n");
freeifaddrs(ifList);
return 3;
}
}
}
printf(stderr, "DEVICE_NONE\r\n");
freeifaddrs(ifList);
return 0;
}
int main(int argc, char* argv[])
{
int i=0;
if(argc != 2)
{
fprintf(stderr, "usage: %s <ethname>\r\n", argv[0]);
return -1;
}
i = c_ifaddrs_netlink_status(argv[1]);
fprintf(stderr,"c_ifaddrs_netlink_status if_status = %d\n", i );
return 0;
}