C++ 发送和接收的消息中的Unix域套接字不匹配

我已经创建了非常基本的客户端和服务器程序，它们使用Unix域套接字从服务器发送消息，消息由客户端捕获

我收到的问题是，我无法捕获从客户端的服务器发送的所有消息

这是我的服务器端代码

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <time.h>
#include <sys/time.h>

#define NAME "uds_socket"
#define DATA "Test Message"
char buf[1024];

int createAndBindSocket() {
    int server_socket;
    struct sockaddr_un server_address;

    unlink(NAME);

    server_socket = socket(AF_UNIX, SOCK_STREAM, 0);
    if (server_socket == -1) {
        perror("Socket creation failed");
        exit(EXIT_FAILURE);
    }
    else printf("Socket creation successful\n");

    int reuse = 1;
    if (setsockopt(server_socket, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse)) == -1) perror("Error : ");
    else printf("Socket options set\n");

    server_address.sun_family = AF_UNIX;
    strcpy(server_address.sun_path, NAME);

    if (bind(server_socket, (struct sockaddr*)&server_address, sizeof(server_address)) == -1) {
        perror("Binding failed");
        close(server_socket);
        exit(EXIT_FAILURE);
    }
    else {
        printf("Socket binding successful with name %s\n", server_address.sun_path);
    }

    if (listen(server_socket, 5) == -1) {
        perror("Listening failed");
        close(server_socket);
        exit(EXIT_FAILURE);
    }
    else printf("Listening ...\n");

    return server_socket;
}

int handleClientRequest(int server_socket) {
    int client_socket;
    client_socket = accept(server_socket, 0, 0);
    if(client_socket == -1) {
        perror("Accepting failed");
        close(server_socket);
        exit(EXIT_FAILURE);
    }
    else {
        printf("Connected to client\n");
    }
    return client_socket;
}

void sendMessage(int client_socket) {
    char* buf = malloc(12);
    for(int i=0; i<5; i++) {
        snprintf(buf, 12, "Hello %d", i);
        if (send(client_socket, buf, sizeof(buf), 0) < 0) {
            perror("writing on stream socket");
            break;
        }
        else {
            printf("Sending message ...\n");
        }
    }
}

int main(int argc, char* argv[]) { 
    int server_socket = createAndBindSocket();
    while(1) {
        int client_socket = handleClientRequest(server_socket);
        sendMessage(client_socket);
        close(client_socket);
    }
    unlink(NAME);
    close(server_socket);

    return 0;
}

这是我的客户端代码

#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>

#define DATA "Test Message"
char buf[1024];

int main(int argc, char* argv[]) {
    int client_socket;
    struct sockaddr_un server_address;
    char buf[1024];

    client_socket = socket(AF_UNIX, SOCK_STREAM, 0);
    if (client_socket == -1) {
        perror("Socket creation failed");
        exit(EXIT_FAILURE);
    }
    server_address.sun_family = AF_UNIX;
    strcpy(server_address.sun_path, argv[1]);

    if (connect(client_socket, (struct sockaddr *)&server_address, sizeof(server_address)) < 0) {
        perror("Connection failed");
        close(client_socket);
        exit(EXIT_FAILURE);
    }    
    else {
        printf("Fetching message ...\n");
        int rval;
        while(1) {
            rval = recv(client_socket, buf, sizeof(buf), 0);
            if(rval < 0) {
                perror("Error reading message\n");
                break;
            }
            else if(rval == 0) {
                printf("Ending connection\n");
                break;
            }
            else {
                printf("%s\n", buf);
            }
        }

    }

    close(client_socket);
}

我希望客户端的输出类似于

Fetching message ...
Hello 0
Hello 1
Hello 2
Hello 3
Hello 4
Ending connection

但每次我运行这些程序时，客户端的输出都不同.也就是说，我有时确实会得到想要的输出，但通常会得到这样的结果

Fetching message ...
Hello 0
Hello 1
Hello 3
Hello 4
Ending connection

其中一些消息丢失了.为什么会这样？如何解决？