Thread: Testing pipe for data

  1. #1
    Registered User
    Join Date
    Apr 2019

    Testing pipe for data


    I have opened a pipe (popen) to a program (ir-keytable), and need a way to test whether there's more data in the pipe or if it's empty.

    Failing that, I need a way to clear all data in a pipe. regardless if there's data.

    I can't seem to find a way to accomplish this.

    I tried:
    fseek(pp, 0L, SEEK_END);
    The only other option I can think of is to close the pipe and open it again for reading. But seems a bit wasteful.

    Hope someone might have a little knowledge to help shed some light.


  2. #2
    Registered User
    Join Date
    Sep 2020
    The select() function can do this for you.

  3. #3
    Registered User
    Join Date
    Mar 2021
    man 7 pipe : ioctl(fd, FIONREAD, &nbytes);

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