How to open a file with the memory address instead the filename (path)


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Thread: How to open a file with the memory address instead the filename (path)

  1. #1
    Join Date
    Jan 2006
    Posts
    1

    How to open a file with the memory address instead the filename (path)

    I can’t reach a solution to the next problem:

    I have a C program that open a file with the function fopen

    fp= fopen( ‘ filename ‘, ‘r’); In a computer “filename” could be
    c://doc/text.txt.

    However I am trying to run the same C program in a PC Board (FPGA) with a
    PowerPC microproccesador, which is capable of run C programs, and the file
    that I want to open is in a DDR memory and begins for example in the memory
    address 0x10000000.

    How could I fill the pointer fp FILE *fp
    In order to the program works as in a computer.

    thank you very much

  2. #2
    Join Date
    Nov 2003
    Posts
    4,118
    Teh short answer is that you can't use FILE* to access a memory based buffer. Instead, use direct memory access: char * p = (char *) 0x10000000;

    And then read the data from the pointer. In some platforms you can map a file to the system's RAM. In this case, you use FILE * etc., but you need to use a few explicit system calls that open the physical file and map its content to a memory address.
    Danny Kalev

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