writing to a child

This is a discussion on writing to a child within the C++ Programming forums, part of the General Programming Boards category; I'm writing a program with different moduals and functions. Basically the program opens a child using a fork than execl ...

  1. #1
    Registered User
    Join Date
    Oct 2001
    Posts
    18

    writing to a child

    I'm writing a program with different moduals and functions. Basically the program opens a child
    using a fork than execl and pipes are created to
    communicate between parent and child. What I can't seem to do is write from the parent to the child after I have left the function that opens the child. In on .h file I have:

    #define fdwr (rdfile[1]) //simple short cuts
    #define fdrd (wrfile[0]) // to handles

    extern int rdfile[2];
    extern int wrfile[2];
    in the .cpp file used to open the child I have defined:

    int rdfile[2];
    int wrfile[2];

    the function looks like:
    int OpenTelnet(char *pszAddress, char *pszPort)
    {
    if (tnproc) return 0;
    pipe(rdfile);
    pipe(wrfile);
    tnproc = fork();
    if (!tnproc)
    {
    dup2(rdfile[0], fileno(stdin));
    dup2(wrfile[1], fileno(stdout));
    close(fileno(stderr));
    setpgrp();
    execl(TELNET, TELNET, pszAddress, pszPort, NULL);
    }
    }

    As I say as long as I am in this function I can write to the child using
    write(fdwr, szBuffer, strlen(szBuffer));
    The problem is writing later in the program. Can
    you direct me.

    Thanks inadvance.

  2. #2
    Registered User
    Join Date
    Oct 2001
    Posts
    18
    Problem fixed the code worked.

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