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Figure G‒2: Return value when USB_STAT is specified
■ For abnormal termination
For abnormal termination, -1 is returned and one of the following codes is returned for the error number (errno).
EINVAL
The argument has an error.
ENXIO
The driver for monitoring the hardware watchdog timer has not started, or the device file for accessing the
driver cannot be opened.
ENOENT
A device file for the GPIO driver does not exist.
EIO
A hardware access error occurred.
G. Library Interface Reference
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Troubleshooting
