5e9a086145
Allow a new bionic to work with an old init property area by supporting
the old format.
(cherry picked from commit ad76c85b9c)
Change-Id: Ib496e818a62a5834d40c71eb4745783d998be893
131 lines
4 KiB
C
131 lines
4 KiB
C
/*
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* Copyright (C) 2008 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* This file is only used to provide backwards compatibility to property areas
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* created by old versions of init, which occurs when an ota runs. The updater
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* binary is compiled statically against the newest bionic, but the recovery
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* ramdisk may be using an old version of init. This can all be removed once
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* OTAs from pre-K versions are no longer supported.
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*/
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#include <string.h>
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#include <sys/atomics.h>
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#define _REALLY_INCLUDE_SYS__SYSTEM_PROPERTIES_H_
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#include <sys/_system_properties.h>
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#define TOC_NAME_LEN(toc) ((toc) >> 24)
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#define TOC_TO_INFO(area, toc) ((prop_info_compat*) (((char*) area) + ((toc) & 0xFFFFFF)))
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struct prop_area_compat {
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unsigned volatile count;
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unsigned volatile serial;
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unsigned magic;
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unsigned version;
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unsigned toc[1];
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};
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typedef struct prop_area_compat prop_area_compat;
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struct prop_area;
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typedef struct prop_area prop_area;
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struct prop_info_compat {
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char name[PROP_NAME_MAX];
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unsigned volatile serial;
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char value[PROP_VALUE_MAX];
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};
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typedef struct prop_info_compat prop_info_compat;
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extern prop_area *__system_property_area__;
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const prop_info *__system_property_find_compat(const char *name)
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{
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prop_area_compat *pa = (prop_area_compat *)__system_property_area__;
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unsigned count = pa->count;
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unsigned *toc = pa->toc;
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unsigned len = strlen(name);
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prop_info_compat *pi;
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if (len >= PROP_NAME_MAX)
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return 0;
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if (len < 1)
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return 0;
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while(count--) {
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unsigned entry = *toc++;
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if(TOC_NAME_LEN(entry) != len) continue;
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pi = TOC_TO_INFO(pa, entry);
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if(memcmp(name, pi->name, len)) continue;
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return (const prop_info *)pi;
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}
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return 0;
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}
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int __system_property_read_compat(const prop_info *_pi, char *name, char *value)
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{
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unsigned serial, len;
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const prop_info_compat *pi = (const prop_info_compat *)_pi;
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for(;;) {
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serial = pi->serial;
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while(SERIAL_DIRTY(serial)) {
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__futex_wait((volatile void *)&pi->serial, serial, 0);
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serial = pi->serial;
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}
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len = SERIAL_VALUE_LEN(serial);
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memcpy(value, pi->value, len + 1);
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if(serial == pi->serial) {
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if(name != 0) {
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strcpy(name, pi->name);
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}
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return len;
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}
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}
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}
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int __system_property_foreach_compat(
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void (*propfn)(const prop_info *pi, void *cookie),
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void *cookie)
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{
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prop_area_compat *pa = (prop_area_compat *)__system_property_area__;
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unsigned i;
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for (i = 0; i < pa->count; i++) {
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unsigned entry = pa->toc[i];
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prop_info_compat *pi = TOC_TO_INFO(pa, entry);
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propfn((const prop_info *)pi, cookie);
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}
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return 0;
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}
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