您将如何接收使用“sendfile”发送的文件？

发布于 2024-12-07 10:52:54 字数 1130 浏览 0 评论 0原文

我正在尝试实现一个基本的文件服务器。我一直在尝试使用此处找到的 sendfile 命令： http://linux.die.net/man /2/sendfile 我正在使用 TCP。

我可以让它发送得很好，但它以二进制形式发送，我不确定这是否是挂断的原因。

我正在尝试使用recv 接收文件，但它没有正确接收。有没有一种特殊的方法来接收二进制文件并将其放入字符串中？

编辑：要求提供一些代码，这里是：

SENDFILE 调用（来自服务器进程）

FILE * file = fopen(filename,"rb");
    if ( file != NULL)   
    {            
        /*FILE EXISITS*/ 
        //Get file size (which is why we opened in binary)
        fseek(file, 0L, SEEK_END);
        int sz = ftell(file);
        fseek(file,0L,SEEK_SET);

        //Send the file
        sendfile(fd,(int)file,0,sz);
        //Cleanup 
        fclose(file);
    }

RECIEVE 调用（来自客户端进程，甚至比循环更基本，只需要一个字母）

//recieve file
    char fileBuffer[1000];
    recv(sockfd,fileBuffer,1,0);
    fprintf(stderr,"\nContents:\n");
    fprintf(stderr,"%c",fileBuffer[0]);

编辑：编写了一些用于检查返回值的代码。 sendfile 给出 errno 9 - 错误的文件号。我假设是在调用中的第二个文件描述符（我正在发送的文件的文件描述符）。我将其转换为 int，因为 sendfile 抱怨它不是 int。

考虑到我在上面的 sendfile 调用中使用的文件指针代码，我应该如何使用发送文件？

原文

I'm trying to implement a basic file server. I have been trying to use the sendfile command found here: http://linux.die.net/man/2/sendfile I'm using TCP.

I can have it send fine, but its sending in binary and I'm not sure if thats the hang up.

I am trying to receive the file with recv, but it isn't coming through correctly.
Is there a special way to receive a binary file, and put it into a string?

EDIT:
Asked to supply some code, here it is:

SENDFILE Call (from Server process)

FILE * file = fopen(filename,"rb");
    if ( file != NULL)   
    {            
        /*FILE EXISITS*/ 
        //Get file size (which is why we opened in binary)
        fseek(file, 0L, SEEK_END);
        int sz = ftell(file);
        fseek(file,0L,SEEK_SET);

        //Send the file
        sendfile(fd,(int)file,0,sz);
        //Cleanup 
        fclose(file);
    }

RECIEVE Call (from Client process, even more basic than a loop, just want a single letter)

//recieve file
    char fileBuffer[1000];
    recv(sockfd,fileBuffer,1,0);
    fprintf(stderr,"\nContents:\n");
    fprintf(stderr,"%c",fileBuffer[0]);

EDIT: wrote some code for checking return values. sendfile is giving errno 9 - bad file number. Which im assuming is at my second file descriptor in the call (the one for the file i'm sending). I cast it as an int because sendfile was complaining it wasn't an int.

How should I use send file given the file pointer code I have used above in th sendfile call?

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