one of GPIOLINE_CHANGED_REQUESTED, GPIOLINE_CHANGED_RELEASED
updated line information
estimate of time of status change occurrence, in nanoseconds and GPIOLINE_CHANGED_CONFIG
Note: struct gpioline_info embedded here has 32-bit alignment on its own, but it works fine with 64-bit alignment too. With its 72 byte size, we can guarantee there are no implicit holes between it and subsequent members. The 20-byte padding at the end makes sure we don't add any implicit padding at the end of the structure on 64-bit architectures.
Information about a change in status of a GPIO line