Thread: creating an array of pipes

  1. #1
    Registered User
    Join Date
    Mar 2010

    creating an array of pipes

    I have a specific number of processes, which were created using fork(), those processes should communicate each with other using pipes. I want to create a dynamic array of pipes or use a Vector so it would contain all the pipes there were created.

    each pipe should be of size of 2 integers so the array of the vector size should be arr[N][2].

    my problem is that I don't know how to create properly this Vector or Array and pass it correctly to the dup2 function.

    Maybe some one could help me with an example?

    I build those two functions:

    int** createArrOfPipes(int amount)
        int** arr = new int*[amount];
        for (int i=0;i<amount;i++)
            arr[i] = new int[2];
        return arr;
    void freeArrOfPipes(int** arr, int amount)
        for (int i=0;i<amount;i++)
            delete[] arr[i];
        delete[] arr;
    and tried to use vector, like this:

    vector< vector<int> > pipes;
    vector<int> read_vec1;
    vector<int> write_vec2;

    but how to do some thing like this:

           for(int i=0;i<(sub_commands.size()-1);i++)
    or this:

                  while (dup2 (pipes[(command_index-1)][read], STDIN_FILENO) < 0)   //dup client's sock with stdin
                        if (errno == EINTR) continue;
                        fprintf(stderr,"dup2 failed.");
    Thanks in advance.

  2. #2
    and the hat of int overfl Salem's Avatar
    Join Date
    Aug 2001
    The edge of the known universe
    int** pipes = createArrOfPipes(amount);
           for(int i=0;i<amount;i++)
    It's just not going to understand STL vectors or anything else.

    You might try creating a myPipe class, containing int p[2] say, then making a std::vector of that object, if you want to wrap some C++ around the low-level API.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.

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