将代码inet_ntoa(client_addr.sin_addr)改为inet_ntop()函数

inet_ntop() 函数能够将网络字节序的二进制IP地址转换为点分十进制格式的字符串IP地址。如果要将代码中的inet_ntoa()函数改为inet_ntop()函数，需要修改以下几点：

1. 在头文件中包含<arpa/inet.h>以使用inet_ntop()函数。
2. 将inet_ntoa(client_addr.sin_addr)替换为inet_ntop(AF_INET, &(client_addr.sin_addr), client_ip, INET_ADDRSTRLEN)，其中client_ip是存放字符串IP地址的缓冲区，INET_ADDRSTRLEN是缓冲区大小。
3. 在调用inet_ntop()函数之前，需要将client_ip缓冲区清空，以防止出现未知的字符。

下面是修改后的代码示例：

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

#define PORT 8080

int main(int argc, char const *argv[]) {
    int server_fd, new_socket, valread;
    struct sockaddr_in address;
    int opt = 1;
    int addrlen = sizeof(address);
    char buffer[1024] = {0};
    char *hello = "Hello from server";
    char client_ip[INET_ADDRSTRLEN];

    // Creating socket file descriptor
    if ((server_fd = socket(AF_INET, SOCK_STREAM, 0)) == 0) {
        perror("socket failed");
        exit(EXIT_FAILURE);
    }

    // Forcefully attaching socket to the port 8080
    if (setsockopt(server_fd, SOL_SOCKET, SO_REUSEADDR | SO_REUSEPORT,
                   &opt, sizeof(opt))) {
        perror("setsockopt");
        exit(EXIT_FAILURE);
    }
    address.sin_family = AF_INET;
    address.sin_addr.s_addr = INADDR_ANY;
    address.sin_port = htons(PORT);

    // Forcefully attaching socket to the port 8080
    if (bind(server_fd, (struct sockaddr *)&address,
             sizeof(address)) < 0) {
        perror("bind failed");
        exit(EXIT_FAILURE);
    }
    if (listen(server_fd, 3) < 0) {
        perror("listen");
        exit(EXIT_FAILURE);
    }
    if ((new_socket = accept(server_fd, (struct sockaddr *)&address,
                             (socklen_t *)&addrlen)) < 0) {
        perror("accept");
        exit(EXIT_FAILURE);
    }

    // Convert binary IP address to string IP address
    memset(client_ip, '\0', INET_ADDRSTRLEN);
    inet_ntop(AF_INET, &(address.sin_addr), client_ip, INET_ADDRSTRLEN);
    printf("Connection accepted from %s:%d\n", client_ip, ntohs(address.sin_port));

    valread = read(new_socket, buffer, 1024);
    printf("%s\n", buffer);
    send(new_socket, hello, strlen(hello), 0);
    printf("Hello message sent\n");
    return 0;
}