How to read the execl() output?

This is a discussion on How to read the execl() output? within the C Programming forums, part of the General Programming Boards category; Which is the best way of getting the output from an execl() call? This call generates some console output and ...

  1. #1
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    How to read the execl() output?

    Which is the best way of getting the output from an execl() call? This call generates some console output and I need to do some kind of capture.

    Thanks,

    Daniel.

  2. #2
    ATH0 quzah's Avatar
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    Pipe it.


    Quzah.
    Hope is the first step on the road to disappointment.

  3. #3
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    Thanks Quzah for your reply.

    Does freopen use pipes?
    I'm doing

    FILE* fpStdout = freopen(STDOUTFILE, "w+", stdout);
    system("ls");

  4. #4
    and the hat of wrongness Salem's Avatar
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    Code:
    FILE *fp = popen("ls","r");
    pclose(fp);
    Then use fgets() like you would for any other regular file.

    Is "ls" just an example, or are you really trying to use ls to get a directory listing into the program?
    If so, look up opendir / readdir / closedir
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
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