How would you receive a file sent with 'sendfile'?

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 r开发者_开发技巧eceive 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?

You cannot use sendfile() with a FILE*, you need a file descriptor as given by open(), close() and friends. You cannot just cast a FILE* into an int and thinking it would work.

Maybe you should read the sendfile() manpage for more information.

There is no special way. You just receive with read() or recv().

Probably, you've got your receiving code wrong.