linux c语言修改ens33 ip指令

要修改Linux系统中ens33网卡的IP地址，可以使用以下C语言代码实现：

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

int main(int argc, char *argv[]) {
    int sockfd;
    struct ifreq ifr;
    struct sockaddr_in *sin;
    char *iface = "ens33";
    char *ipaddr = "192.168.0.100";
    char *netmask = "255.255.255.0";
    char *broadcast = "192.168.0.255";

    sockfd = socket(AF_INET, SOCK_DGRAM, 0);
    if (sockfd < 0) {
        perror("socket");
        exit(1);
    }

    memset(&ifr, 0, sizeof(ifr));
    strncpy(ifr.ifr_name, iface, IFNAMSIZ);

    sin = (struct sockaddr_in *)&ifr.ifr_addr;
    sin->sin_family = AF_INET;
    sin->sin_addr.s_addr = inet_addr(ipaddr);
    if (ioctl(sockfd, SIOCSIFADDR, &ifr) < 0) {
        perror("ioctl SIOCSIFADDR");
        exit(1);
    }

    sin = (struct sockaddr_in *)&ifr.ifr_netmask;
    sin->sin_family = AF_INET;
    sin->sin_addr.s_addr = inet_addr(netmask);
    if (ioctl(sockfd, SIOCSIFNETMASK, &ifr) < 0) {
        perror("ioctl SIOCSIFNETMASK");
        exit(1);
    }

    sin = (struct sockaddr_in *)&ifr.ifr_broadaddr;
    sin->sin_family = AF_INET;
    sin->sin_addr.s_addr = inet_addr(broadcast);
    if (ioctl(sockfd, SIOCSIFBRDADDR, &ifr) < 0) {
        perror("ioctl SIOCSIFBRDADDR");
        exit(1);
    }

    close(sockfd);

    printf("IP address of %s has been set to %s\n", iface, ipaddr);
    return 0;
}

这段代码使用了系统调用 `ioctl()` 来设置网卡的IP地址、子网掩码和广播地址。需要注意的是，你需要以root权限运行这个程序，否则可能会无法执行 `ioctl()` 调用。