linux 获取本地ip接口和实例

#include <arpa/inet.h>
#include <sys/socket.h>
#include <netdb.h>
#include <ifaddrs.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

int main(int argc, char *argv[])
{
    struct ifaddrs *ifaddr, *ifa;
    int family, s;
    char host[NI_MAXHOST];

    if (getifaddrs(&ifaddr) == -1)
    {
        perror("getifaddrs");
        exit(EXIT_FAILURE);
    }

    for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next)
    {
        if (ifa->ifa_addr == NULL)
            continue;

        family = ifa->ifa_addr->sa_family;

        if (family == AF_INET)
        {
            printf("interfac: %s, ip: %s\n", ifa->ifa_name, inet_ntoa(((struct sockaddr_in *)ifa->ifa_addr)->sin_addr));
        }
    }

    freeifaddrs(ifaddr);
    exit(EXIT_SUCCESS);
}

结果：

 

getifaddrs接口API

该接口可以获取一个类似链表的结果

ifaddrs结构体