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Altera_Forum's avatar
Altera_Forum
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8 years ago

findPlatform() Call Changes Directories

I have a Cyclone V Development Kit. I have compiled my host code to a shared library (.so) and I am using this to make opencl calls from python using ctypes.cdll.

Let's say I am running my program from `/home/root` on the board, as soon as I enter the `findPlatform()` call, my program switches directories to `/usr/bin` which is causing quite the headache. I've gone into the function in `opencl.cpp` and the directory is already `/usr/bin` as soon as I am in the function, so it looks like something to do with `findPlatform()` call from my host code.

Any ideas? I have no idea what is going on.

3 Replies

  • Altera_Forum's avatar
    Altera_Forum
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    8 years ago

    I'm not sure if this is your issue, but if you're looking at the Altera OpenCL examples in their host code. Within the init_opencl() there is

    if(!setCwdToExeDir()) {

    return false;

    }

    statement which changes your working directory during runtime.

    I'm not entirely sure of its purpose but if you comment that out, it should work fine I'd imagine.
  • Altera_Forum's avatar
    Altera_Forum
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    8 years ago

    That does seem to work, not sure how I missed that one! Thank you.

    I don't quite understand the purpose of this either, hopefully there are no repercussions.
  • Altera_Forum's avatar
    Altera_Forum
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    8 years ago

    Yep, no problem. I've ran into that issue too and so far I haven't had any issues come up after removing it.