Adding upstream version 124.0.1.upstream/124.0.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 14 insertions, 0 deletions

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+# ashmem-rs
+
+Provides a compatibility interface for Android 8.0's public ASharedMemory API.
+
+Some variant of ashmem has existed in Android as a private API for some time.  Originally available only via [direct ioctl interface](https://elixir.bootlin.com/linux/v5.11.8/source/drivers/staging/android/uapi/ashmem.h), it later became callable (still private) via ashmem_create_region (et al.) in libcutils.
+
+[ASharedMemory](https://developer.android.com/ndk/reference/group/memory) is the public API to ashmem made available in Android 8.0 (API level 26).
+Builds targeting Android 10 (API 29) are no longer permitted to access ashmem via the ioctl interface.  This makes life for a portable program difficult - you can't reliably use the old or new interface during this transition period.
+
+ashmem-rs provides a simple wrapper around the ASharedMemory API, directly calling the public API implementation via dynamically loaded libandroid where available, and falling back to the direct ioctl interface elsewhere.
+
+References:
+ - [ASharedMemory documentation](https://developer.android.com/ndk/reference/group/memory)
+ - [Linux kernel ashmem.h definitions](https://elixir.bootlin.com/linux/v5.11.8/source/drivers/staging/android/uapi/ashmem.h)