Thread: how to get the output of a non-stop process?

  1. #1
    Registered User
    Join Date
    Sep 2001
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    18

    how to get the output of a non-stop process?

    i use popen to get the output of this command:
    tail -f /var/log/kern.log

    I use a while loop and fgets (to get the output)
    the process is running and will not stop. other process cannot run and others hang!

    how to solve this?

  2. #2
    Guest Sebastiani's Avatar
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    Waterloo, Texas
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    5,708
    while( !feof( filePointer ) )
    fgets(buff, 500, filePointer);

    ...Should work.

    else you could do:

    while(fgets(buff, 500, filePointer) != NULL)
    //do something

    ..or simply:
    while(fgets(buff, 500, filePointer) )

    if that still doesn't work, be sure (A) the file is a text file, and (B) you opened it in text mode, ie: "r".
    Code:
    #include <cmath>
    #include <complex>
    bool euler_flip(bool value)
    {
        return std::pow
        (
            std::complex<float>(std::exp(1.0)), 
            std::complex<float>(0, 1) 
            * std::complex<float>(std::atan(1.0)
            *(1 << (value + 2)))
        ).real() < 0;
    }

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