android-12-source-code--write-file-function

find /app4/lineage19_oneplus6/system/ -name "*.cpp" -type f | while read -r k ; do ( grep -i  write $k | grep -i  file && echo $k  ;) ; done

获得android::base::WriteStringToFile,

进一步修改

find /app4/lineage19_oneplus6/system/ -name "*.cpp" -type f | while read -r k ; do ( grep -i  'WriteStringToFile("'  $k  && echo $k  ;) ; done

发现

// 文件: /app4/lineage19_oneplus6/system/logging/logd/logd_test.cppif (!android::base::WriteStringToFile("3\n", "/proc/sys/vm/drop_caches")) {