Not sure for your case, but I guess the IMX219 sensor is accessed by nvarguscamerasrc in gstreamer.
You may try to use V4L API for reading the current exposure, but you wouldn’t set it from V4L API while it is controlled by Argus.
You can control exposure from Argus, but you may have to fix gain and disable/lock some auto settings such as gain, wb and maybe lock ae such as here (also read @JerryChang 's next post) or set AE range for your case. It may just be that other auto settings are adjusted (gain, digitalgain, wb, …) before exposure.
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