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1890 :: How do I read stderr, set by ioctl?

• xyz32 (orginal) [2015-12-24T02:35:16+01:00] view original

  I have the following code. When ioctl returns an error: "the global variable errno is set appropriately." How do I handle this?

  
  proc setSlaveAddress* (busHandle: File, slaveAddr: int) =
    ## Set up the i2c bus to connect to a specific client
    
    if ioctl(busHandle, uint(slaveAddr), 0x0) != 0:
      echo readChar(stderr)
      raise newException(IOError, "Failed to set slave address: '" & $slaveAddr & "' error code NUMBER")
    #end
  #end
  Run

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• dom96 (orginal) [2015-12-24T17:16:23+01:00] view original

  Call this procedure: http://nim-lang.org/docs/os.html#raiseOSError,string

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• xyz32 (orginal) [2015-12-24T22:28:52+01:00] view original

  Thank you, that worked, now I only have to figure out the Bad file descriptor [OSError] and I am good.

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