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Resetprop small refactor

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topjohnwu
2018-03-26 21:21:48 +08:00
parent cc7e74ca11
commit f0bac6b154
2 changed files with 14 additions and 60 deletions
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46
native/jni/resetprop/resetprop.cpp
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@ -2,52 +2,6 @@
*
* Copyright 2016 nkk71 <nkk71x@gmail.com>
* Copyright 2016 topjohnwu <topjohnwu@gmail.com>
*
* Info:
*
* all changes are in
*
* bionic/libc/bionic/system_properties.cpp
*
* Functions that need to be patched/added in system_properties.cpp
*
* int __system_properties_init2()
* on android 7, first tear down the everything then let it initialize again:
* if (initialized) {
* //list_foreach(contexts, [](context_node* l) { l->reset_access(); });
* //return 0;
* free_and_unmap_contexts();
* initialized = false;
* }
*
*
* static prop_area* map_prop_area(const char* filename, bool is_legacy)
* we dont want this read only so change: 'O_RDONLY' to 'O_RDWR'
*
* static prop_area* map_fd_ro(const int fd)
* we dont want this read only so change: 'PROT_READ' to 'PROT_READ | PROT_WRITE'
*
*
* Copy the code of prop_info *prop_area::find_property, and modify to delete props
* const prop_info *prop_area::find_property_and_del(prop_bt *const trie, const char *name)
* {
* ...
* ... Do not alloc a new prop_bt here, remove all code involve alloc_if_needed
* ...
*
* if (prop_offset != 0) {
* atomic_store_explicit(&current->prop, 0, memory_order_release); // Add this line to nullify the prop entry
* return to_prop_info(&current->prop);
* } else {
*
* ....
* }
*
*
* by patching just those functions directly, all other functions should be ok
* as is.
*
*
*/
#include <stdio.h>