resetpropAlone

Standalone (or multi-call) resetprop — Magisk-style Android system property tool for YukiSU.

• Entry: resetprop_main(int argc, char **argv) for use when linked into ksud; define RESETPROP_STANDALONE for a standalone executable with main().
• Android: Uses bionic __system_property_* APIs plus direct prop-area mmap edits for -n, delete fallback when __system_property_delete is unavailable, prop-area compaction, persistent property storage support, and property-context parsing across serialized, split, and pre-split layouts.
• Supported flags: -n, -d/--delete, -c/--rebuild/--compact [CONTEXT], --force, -w, --timeout, -f/--file, -p, -P, -Z, -A/--area-path, --context-type, --serial-path, -v.
• Usage:
  • no args = list all properties
  • NAME = get property, context (-Z), or backing area path (-A)
  • NAME VALUE = set property; arguments after NAME are literal values, including -d and --help
  • -d NAME = delete property
  • -f FILE = load a system.prop-style file
  • -w NAME [OLD_VALUE] = wait for existence/change
  • -c = rebuild property areas containing allocation gaps or abnormal layouts; unchanged areas succeed
  • -c --force = rebuild every property area
  • -c CONTEXT = rebuild one SELinux context
  • -c -Z NAME / -c -d NAME = resolve NAME's context and rebuild it, optionally deleting NAME first
  • -p = include stored persist.* properties, preferring runtime values when reading
  • -P = read only stored persistent properties
  • --context-type = print detected property-context backend (serialized, split, or presplit)
  • --serial-path = print the current global property serial area path

Long property values are preserved by single-property reads and waits. Wait timeouts must be finite, nonnegative, and representable by the monotonic clock.

Build

Android (NDK)

export ANDROID_NDK=/path/to/ndk
cmake -S . -B build_android \
  -DCMAKE_TOOLCHAIN_FILE=$ANDROID_NDK/build/cmake/android.toolchain.cmake \
  -DANDROID_ABI=arm64-v8a \
  -DANDROID_PLATFORM=android-26
cmake --build build_android

(API 26+ for __system_property_read_callback.)

Host (stub)

cmake -S . -B build && cmake --build build

Prints that resetprop is for Android only.