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bionic: add compatibility mode for properties

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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
This commit is contained in:
Colin Cross
2013-06-24 18:36:39 -07:00
parent 1ec20a086c
commit 5e9a086145
4 changed files with 160 additions and 1 deletions
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10
libc/include/sys/_system_properties.h
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@@ -38,6 +38,7 @@ typedef struct prop_msg prop_msg;
#define PROP_AREA_MAGIC 0x504f5250
#define PROP_AREA_VERSION 0xfc6ed0ab
#define PROP_AREA_VERSION_COMPAT 0x45434f76
#define PROP_SERVICE_NAME "property_service"
#define PROP_FILENAME "/dev/__properties__"
@@ -129,6 +130,15 @@ unsigned int __system_property_serial(const prop_info *pi);
** successive call. */
unsigned int __system_property_wait_any(unsigned int serial);
/* Compatibility functions to support using an old init with a new libc,
** mostly for the OTA updater binary. These can be deleted once OTAs from
** a pre-K release no longer needed to be supported. */
const prop_info *__system_property_find_compat(const char *name);
int __system_property_read_compat(const prop_info *pi, char *name, char *value);
int __system_property_foreach_compat(
void (*propfn)(const prop_info *pi, void *cookie),
void *cookie);
__END_DECLS
#endif