Question

我想将完整的文件夹从客户端发送到服务器。该文件夹有二进制文件。但是现在我正在使用文件夹中的文本文件。由于我一步一步走，我目前正在处理类似于显示文件夹中文件名称的内容：

打开目录
阅读整个目录
从客户端向服务器一个接一个地发送文件名称
服务器正在接收
整个文件夹完成从中读取所有文件后，文件夹将关闭。

我面临的问题是：在发送文件名时，服务器正确接收文件名，但是当服务器忙于从缓冲区中取出东西时，客户端已经将下一个文件名写入缓冲区，因此两个或多个文件名被附加到缓冲区和服务器一次读取所有内容。

如何解决此问题，因为我希望客户端一次只发送一个文件名，服务器应该只收到一个文件名。我应该如何同步这些电话？或者我应该如何限制缓冲区？

Server.c

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

#define MAX 1024
#define SOCK_PATH "/tmp/foo"

int s, s2, t, len;
struct sockaddr_un local, remote;

void createSSocket()
{
    if ((s = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) 
    {
        perror("socket");
        exit(1);
    }
    printf("\nServer Socket Created...");
}

void setSSocketPath()
{
    local.sun_family = AF_UNIX;
    strcpy(local.sun_path, SOCK_PATH);
    unlink(local.sun_path);
    len = strlen(local.sun_path) + sizeof(local.sun_family);
    printf("\nServer Socket Path Set...");
}

void bindSocket()
{
    if (bind(s, (struct sockaddr *)&local, len) == -1) 
    {
        perror("bind");
        exit(1);
    }
    printf("\nSocket Binded...");
}

void listenSocket()
{   
    if (listen(s, 5) == -1) 
    {
          perror("listen");
          exit(1);
    }
    printf("\nListening Socket...");
}

void acceptConnection()
{
    printf("\nWaiting for a connection...");
    t = sizeof(remote);
    if ((s2 = accept(s, (struct sockaddr *)&remote, &t)) == -1) 
    {
        perror("accept");
        exit(1);
    }
    printf("\nServer Socket Connected...");
}

void closeSSocket()
{
    close(s2);
    printf("\nServer Socket Closed...");
}

void receiveData()
{
    char str[MAX] = {0};
    int n;
    while(1)
    {
        //printf("\n%d ... %s",n,str);
        n = recv(s2, str, MAX, 0);
        str[n] = 0;
        printf("\n%d ... %s",n,str);
        if(!strcmp(str,"@#$%")) // 2345
        break;
    }
}

int main()
{
    createSSocket();    
    setSSocketPath();
    bindSocket();
    listenSocket();
    acceptConnection();

    receiveData();

    closeSSocket();
    return 0;   
}

Client.c

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <dirent.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>

#define MAX 1024
#define SOCK_PATH "/tmp/foo"


int s, t, len;
struct sockaddr_un remote;
char path[MAX] = "/home/priyanka/criu-1.4/3455";  //to retieve path from folder
DIR *dirDes;
struct dirent *expFile;

void createCSocket()
{
    if ((s = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) 
    {
        perror("socket");
        exit(1);
    }
    printf("\nClient Socket Created...");
}

void setCSocketPath()
{
    remote.sun_family = AF_UNIX;
    strcpy(remote.sun_path, SOCK_PATH);
    len = strlen(remote.sun_path) + sizeof(remote.sun_family);
    printf("\nClient Socket Path Set...");
}

void connectSocket()
{
    printf("\nTrying to connect...");
    if (connect(s, (struct sockaddr *)&remote, len) == -1) 
    {
        perror("connect");
        exit(1);
    }
    printf("\nClient Connected...\n");
}

void closeCSocket()
{
    close(s);
    printf("\nClient Socket Closed...");
}

void readDirectory()
{
    char temp[MAX] = {0};
    dirDes = opendir(path);     //open the directory in which files related to process are dumped
    if(dirDes == NULL)
        printf("Error Opening Directory !!! \n");
   else
   {
        while(expFile = readdir(dirDes))    //read the directory
        {
            int bb;
            char str[MAX] = {0};
            if(strcmp(expFile -> d_name,".") == 0)      //skip folder with name "."
                continue;
            if(strcmp(expFile -> d_name,"..") == 0)     //skip folder with name ".."
                continue;
            strcpy(temp,path);
            if(temp[strlen(temp)-1]!='/')       //if the temp has / appended at the end skip else append
            strcat(temp,"/");
            strcat(temp,expFile->d_name);       //append the file name read to the path
            printf("\n%s",temp);
            sprintf(str,"%d",strlen(temp));
            bb = send(s,str,strlen(str),0);
            if(bb == -1)
            {
                perror("Error sending file name length");
            }
            bb = send(s,temp,strlen(temp),0);
            //sleep(1);
            if(bb == -1)
            {
                perror("Error sending file name");
            }
            /*else
            {
                printf("Name sent 1\n");
            }*/
        }   
        closedir(dirDes);       //close directory
        send(s,"@#$%",strlen("@#$%"),0);
    }
}


int main()
{
    createCSocket();
    setCSocketPath();
    connectSocket();

    readDirectory();    

    closeCSocket(); 
    return 0;
}

如何在C中的套接字编程中同步send和recv调用？

0 个答案: