用c语言得到linux本机的IP地址

    用下面的函数可以直接找到你的ip地址

    [code:1:4b9fddf037]#include <stdio.h>
    #include <sys/types.h>
    #include <sys/socket.h>
    #include <sys/ioctl.h>
    #include <netinet/in.h>
    #include <net/if.h>
    #include <net/if_arp.h>
    #include <arpa/inet.h>
    #include <errno.h>

    #define ETH_NAME "eth0"

    int main()
    {
    int sock;
    struct sockaddr_in sin;
    struct ifreq ifr;

    sock = socket(AF_INET, SOCK_DGRAM, 0);
    if (sock == -1)
    {
    perror("socket");
    return -1;
    }

    strncpy(ifr.ifr_name, ETH_NAME, IFNAMSIZ);
    ifr.ifr_name[IFNAMSIZ - 1] = 0;

    if (ioctl(sock, SIOCGIFADDR, &ifr) < 0)
    {
    perror("ioctl");
    return -1;
    }

    memcpy(&sin, &ifr.ifr_addr, sizeof(sin));
    fprintf(stdout, "eth0: %s\n", inet_ntoa(sin.sin_addr));

    return 0;
    }[/code:1:4b9fddf037]