linux c语言设置ip

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <unistd.h>

void set_ip(const char *interface, const char *ip, const char *subnet_mask) {
    int sockfd;
    struct ifreq ifr;
    struct sockaddr_in *addr;

    sockfd = socket(AF_INET, SOCK_DGRAM, 0);
    if (sockfd < 0) {
        perror("socket");
        return;
    }

    memset(&ifr, 0, sizeof(ifr));
    strncpy(ifr.ifr_name, interface, IFNAMSIZ - 1);

    addr = (struct sockaddr_in *)&ifr.ifr_addr;
    addr->sin_family = AF_INET;
    addr->sin_port = htons(0);
    inet_pton(AF_INET, ip, &addr->sin_addr);

    if (ioctl(sockfd, SIOCSIFADDR, &ifr) < 0) {
        perror("ioctl SIOCSIFADDR");
        close(sockfd);
        return;
    }

    memset(&ifr, 0, sizeof(ifr));
    strncpy(ifr.ifr_name, interface, IFNAMSIZ - 1);

    addr = (struct sockaddr_in *)&ifr.ifr_netmask;
    addr->sin_family = AF_INET;
    inet_pton(AF_INET, subnet_mask, &addr->sin_addr);

    if (ioctl(sockfd, SIOCSIFNETMASK, &ifr) < 0) {
        perror("ioctl SIOCSIFNETMASK");
        close(sockfd);
        return;
    }

    close(sockfd);
}

int main() {
    set_ip("eth0", "192.168.1.100", "255.255.255.0");
    printf("IP set successfully.\n");
    return 0;
}