unsigned volatile serial;
unsigned magic;
unsigned version;
- unsigned reserved[4];
unsigned toc[1];
};
typedef struct prop_info prop_info;
static const char property_service_socket[] = "/dev/socket/" PROP_SERVICE_NAME;
+static char property_filename[PATH_MAX] = PROP_FILENAME;
-static unsigned dummy_props = 0;
-
-prop_area *__system_property_area__ = (void*) &dummy_props;
+prop_area *__system_property_regions__[PA_REGION_COUNT] = { NULL, };
static int get_fd_from_env(void)
{
return atoi(env);
}
-void __system_property_area_init(void *data)
+static int map_prop_region_rw(size_t region)
{
- prop_area *pa = data;
+ prop_area *pa;
+ int fd;
+ size_t offset = region * PA_SIZE;
+
+ if (__system_property_regions__[region]) {
+ return 0;
+ }
+
+ /* dev is a tmpfs that we can use to carve a shared workspace
+ * out of, so let's do that...
+ */
+ fd = open(property_filename, O_RDWR | O_CREAT | O_NOFOLLOW, 0644);
+ if (fd < 0) {
+ if (errno == EACCES) {
+ /* for consistency with the case where the process has already
+ * mapped the page in and segfaults when trying to write to it
+ */
+ abort();
+ }
+ return -1;
+ }
+
+ if (ftruncate(fd, offset + PA_SIZE) < 0)
+ goto out;
+
+ pa = mmap(NULL, PA_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd, offset);
+ if(pa == MAP_FAILED)
+ goto out;
+
memset(pa, 0, PA_SIZE);
pa->magic = PROP_AREA_MAGIC;
pa->version = PROP_AREA_VERSION;
/* plug into the lib property services */
- __system_property_area__ = pa;
+ __system_property_regions__[region] = pa;
+
+ close(fd);
+ return 0;
+
+out:
+ close(fd);
+ return -1;
+}
+
+int __system_property_set_filename(const char *filename)
+{
+ size_t len = strlen(filename);
+ if (len >= sizeof(property_filename))
+ return -1;
+
+ strcpy(property_filename, filename);
+ return 0;
+}
+
+int __system_property_area_init()
+{
+ return map_prop_region_rw(0);
}
-int __system_properties_init(void)
+static int map_prop_region(size_t region)
{
bool fromFile = true;
+ bool swapped;
+ size_t offset = region * PA_SIZE;
int result = -1;
- if(__system_property_area__ != ((void*) &dummy_props)) {
+ if(__system_property_regions__[region]) {
return 0;
}
- int fd = open(PROP_FILENAME, O_RDONLY | O_NOFOLLOW);
+ int fd = open(property_filename, O_RDONLY | O_NOFOLLOW);
if ((fd < 0) && (errno == ENOENT)) {
/*
if ((fd_stat.st_uid != 0)
|| (fd_stat.st_gid != 0)
- || ((fd_stat.st_mode & (S_IWGRP | S_IWOTH)) != 0)) {
+ || ((fd_stat.st_mode & (S_IWGRP | S_IWOTH)) != 0)
+ || (fd_stat.st_size < offset + PA_SIZE) ) {
goto cleanup;
}
- prop_area *pa = mmap(NULL, fd_stat.st_size, PROT_READ, MAP_SHARED, fd, 0);
+ prop_area *pa = mmap(NULL, PA_SIZE, PROT_READ, MAP_SHARED, fd, offset);
if (pa == MAP_FAILED) {
goto cleanup;
}
if((pa->magic != PROP_AREA_MAGIC) || (pa->version != PROP_AREA_VERSION)) {
- munmap(pa, fd_stat.st_size);
+ munmap(pa, PA_SIZE);
goto cleanup;
}
- __system_property_area__ = pa;
result = 0;
+ swapped = __sync_bool_compare_and_swap(&__system_property_regions__[region],
+ NULL, pa);
+ if (!swapped) {
+ /**
+ * In the event of a race either mapping is equally good, so
+ * the thread that lost can just throw its mapping away and proceed as
+ * normal.
+ */
+ munmap(pa, PA_SIZE);
+ }
cleanup:
if (fromFile) {
return result;
}
+int __system_properties_init()
+{
+ return map_prop_region(0);
+}
+
int __system_property_foreach(
void (*propfn)(const prop_info *pi, void *cookie),
void *cookie)
{
- prop_area *pa = __system_property_area__;
- unsigned i;
+ size_t region;
+
+ for (region = 0; region < PA_REGION_COUNT; region++) {
+ prop_area *pa;
+ unsigned i;
+
+ int err = map_prop_region(region);
+ if (err < 0)
+ break;
+ pa = __system_property_regions__[region];
- for (i = 0; i < pa->count; i++) {
- unsigned entry = pa->toc[i];
- prop_info *pi = TOC_TO_INFO(pa, entry);
- propfn(pi, cookie);
+ for (i = 0; i < pa->count; i++) {
+ unsigned entry = pa->toc[i];
+ prop_info *pi = TOC_TO_INFO(pa, entry);
+ propfn(pi, cookie);
+ }
}
return 0;
const prop_info *__system_property_find_nth(unsigned n)
{
- prop_area *pa = __system_property_area__;
+ size_t region = n / PA_COUNT_MAX;
+ prop_area *pa;
+
+ int err = map_prop_region(region);
+ if (err < 0)
+ return NULL;
+ pa = __system_property_regions__[region];
- if(n >= pa->count) {
+ if((n % PA_COUNT_MAX) >= pa->count) {
return 0;
} else {
return TOC_TO_INFO(pa, pa->toc[n]);
const prop_info *__system_property_find(const char *name)
{
- prop_area *pa = __system_property_area__;
- unsigned count = pa->count;
- unsigned *toc = pa->toc;
unsigned len = strlen(name);
- prop_info *pi;
+ size_t region;
if (len >= PROP_NAME_MAX)
return 0;
if (len < 1)
return 0;
- while(count--) {
- unsigned entry = *toc++;
- if(TOC_NAME_LEN(entry) != len) continue;
+ for (region = 0; region < PA_REGION_COUNT; region++) {
+ prop_area *pa;
+ unsigned count;
+ unsigned *toc;
+ prop_info *pi;
+
+ int err = map_prop_region(region);
+ if (err < 0)
+ return 0;
+ pa = __system_property_regions__[region];
+ count = pa->count;
+ toc = pa->toc;
+
+ while(count--) {
+ unsigned entry = *toc++;
+ if(TOC_NAME_LEN(entry) != len) continue;
- pi = TOC_TO_INFO(pa, entry);
- if(memcmp(name, pi->name, len)) continue;
+ pi = TOC_TO_INFO(pa, entry);
+ if(memcmp(name, pi->name, len)) continue;
- return pi;
+ return pi;
+ }
}
return 0;
{
unsigned n;
if(pi == 0) {
- prop_area *pa = __system_property_area__;
+ prop_area *pa = __system_property_regions__[0];
n = pa->serial;
do {
__futex_wait(&pa->serial, n, 0);
int __system_property_update(prop_info *pi, const char *value, unsigned int len)
{
- prop_area *pa = __system_property_area__;
+ prop_area *pa = __system_property_regions__[0];
if (len >= PROP_VALUE_MAX)
return -1;
int __system_property_add(const char *name, unsigned int namelen,
const char *value, unsigned int valuelen)
{
- prop_area *pa = __system_property_area__;
- prop_info *pa_info_array = (void*) (((char*) pa) + PA_INFO_START);
+ prop_area *pa;
+ prop_info *pa_info_array;
prop_info *pi;
+ size_t region;
- if (pa->count == PA_COUNT_MAX)
- return -1;
if (namelen >= PROP_NAME_MAX)
return -1;
if (valuelen >= PROP_VALUE_MAX)
if (namelen < 1)
return -1;
+ for (region = 0; region < PA_REGION_COUNT; region++)
+ {
+ int err = map_prop_region_rw(region);
+ if (err < 0)
+ return -1;
+
+ pa = __system_property_regions__[region];
+
+ if (pa->count < PA_COUNT_MAX)
+ break;
+ }
+
+ if (region == PA_REGION_COUNT)
+ return -1;
+
+ pa_info_array = (void*) (((char*) pa) + PA_INFO_START);
pi = pa_info_array + pa->count;
pi->serial = (valuelen << 24);
memcpy(pi->name, name, namelen + 1);
memcpy(pi->value, value, valuelen + 1);
- pa->toc[pa->count] =
- (namelen << 24) | (((unsigned) pi) - ((unsigned) pa));
+ pa->toc[pa->count] = (namelen << 24) | (((unsigned) pi) - ((unsigned) pa));
pa->count++;
pa->serial++;
unsigned int __system_property_wait_any(unsigned int serial)
{
- prop_area *pa = __system_property_area__;
+ prop_area *pa = __system_property_regions__[0];
do {
__futex_wait(&pa->serial, serial, 0);
#define PROP_SERVICE_NAME "property_service"
#define PROP_FILENAME "/dev/__properties__"
-/* (8 header words + 247 toc words) = 1020 bytes */
-/* 1024 bytes header and toc + 247 prop_infos @ 128 bytes = 32640 bytes */
+/* (4 header words + 28 toc words) = 128 bytes */
+/* 128 bytes header and toc + 28 prop_infos @ 128 bytes = 3712 bytes */
-#define PA_COUNT_MAX 247
-#define PA_INFO_START 1024
-#define PA_SIZE 32768
+#define PA_COUNT_MAX 28
+#define PA_REGION_COUNT 128
+#define PA_INFO_START 128
+#define PA_SIZE 4096
#define TOC_NAME_LEN(toc) ((toc) >> 24)
#define TOC_TO_INFO(area, toc) ((prop_info*) (((char*) area) + ((toc) & 0xFFFFFF)))
#define PROP_PATH_FACTORY "/factory/factory.prop"
/*
+** Map the property area from the specified filename. This
+** method is for testing only.
+*/
+int __system_property_set_filename(const char *filename);
+
+/*
** Initialize the area to be used to store properties. Can
** only be done by a single process that has write access to
** the property area.
*/
-void __system_property_area_init(void *data);
+int __system_property_area_init();
/* Add a new system property. Can only be done by a single
** process that has write access to the property area, and
*/
#include "benchmark.h"
+#include <unistd.h>
#define _REALLY_INCLUDE_SYS__SYSTEM_PROPERTIES_H_
#include <sys/_system_properties.h>
#include <vector>
+#include <string>
-extern void *__system_property_area__;
+extern void *__system_property_regions__[PA_REGION_COUNT];
#define TEST_NUM_PROPS \
- Arg(1)->Arg(4)->Arg(16)->Arg(64)->Arg(128)->Arg(247)
+ Arg(1)->Arg(4)->Arg(16)->Arg(64)->Arg(128)->Arg(256)->Arg(512)->Arg(1024)
struct LocalPropertyTestState {
- LocalPropertyTestState(int nprops) : nprops(nprops) {
+ LocalPropertyTestState(int nprops) : nprops(nprops), valid(false) {
static const char prop_name_chars[] = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ.-_";
- old_pa = __system_property_area__;
- pa = malloc(PA_SIZE);
- __system_property_area_init(pa);
+
+ char dir_template[] = "/data/nativetest/prop-XXXXXX";
+ char *dirname = mkdtemp(dir_template);
+ if (!dirname) {
+ perror("making temp file for test state failed (is /data/nativetest writable?)");
+ return;
+ }
+
+ for (size_t i = 0; i < PA_REGION_COUNT; i++) {
+ old_pa[i] = __system_property_regions__[i];
+ __system_property_regions__[i] = NULL;
+ }
+
+ pa_dirname = dirname;
+ pa_filename = pa_dirname + "/__properties__";
+
+ __system_property_set_filename(pa_filename.c_str());
+ __system_property_area_init();
names = new char* [nprops];
name_lens = new int[nprops];
}
__system_property_add(names[i], name_lens[i], values[i], value_lens[i]);
}
+
+ valid = true;
}
~LocalPropertyTestState() {
- __system_property_area__ = old_pa;
+ if (!valid)
+ return;
+
+ for (size_t i = 0; i < PA_REGION_COUNT; i++) {
+ __system_property_regions__[i] = old_pa[i];
+ }
+
+ __system_property_set_filename(PROP_FILENAME);
+ unlink(pa_filename.c_str());
+ rmdir(pa_dirname.c_str());
+
for (int i = 0; i < nprops; i++) {
delete names[i];
delete values[i];
delete[] name_lens;
delete[] values;
delete[] value_lens;
- free(pa);
}
public:
const int nprops;
int *name_lens;
char **values;
int *value_lens;
+ bool valid;
private:
- void *pa;
- void *old_pa;
+ std::string pa_dirname;
+ std::string pa_filename;
+ void *old_pa[PA_REGION_COUNT];
};
static void BM_property_get(int iters, int nprops)
LocalPropertyTestState pa(nprops);
char value[PROP_VALUE_MAX];
+ if (!pa.valid)
+ return;
+
srandom(iters * nprops);
StartBenchmarkTiming();
LocalPropertyTestState pa(nprops);
+ if (!pa.valid)
+ return;
+
srandom(iters * nprops);
StartBenchmarkTiming();
#include <gtest/gtest.h>
#include <sys/wait.h>
+#include <unistd.h>
+#include <string>
#if __BIONIC__
#define _REALLY_INCLUDE_SYS__SYSTEM_PROPERTIES_H_
#include <sys/_system_properties.h>
-extern void *__system_property_area__;
+extern void *__system_property_regions__[PA_REGION_COUNT];
struct LocalPropertyTestState {
- LocalPropertyTestState() {
- old_pa = __system_property_area__;
- pa = malloc(PA_SIZE);
- __system_property_area_init(pa);
+ LocalPropertyTestState() : valid(false) {
+ char dir_template[] = "/data/nativetest/prop-XXXXXX";
+ char *dirname = mkdtemp(dir_template);
+ if (!dirname) {
+ perror("making temp file for test state failed (is /data/nativetest writable?)");
+ return;
+ }
+
+ for (size_t i = 0; i < PA_REGION_COUNT; i++) {
+ old_pa[i] = __system_property_regions__[i];
+ __system_property_regions__[i] = NULL;
+ }
+
+ pa_dirname = dirname;
+ pa_filename = pa_dirname + "/__properties__";
+
+ __system_property_set_filename(pa_filename.c_str());
+ __system_property_area_init();
+ valid = true;
}
~LocalPropertyTestState() {
- __system_property_area__ = old_pa;
- free(pa);
+ if (!valid)
+ return;
+
+ for (size_t i = 0; i < PA_REGION_COUNT; i++) {
+ __system_property_regions__[i] = old_pa[i];
+ }
+
+ __system_property_set_filename(PROP_FILENAME);
+ unlink(pa_filename.c_str());
+ rmdir(pa_dirname.c_str());
}
+public:
+ bool valid;
private:
- void *pa;
- void *old_pa;
+ std::string pa_dirname;
+ std::string pa_filename;
+ void *old_pa[PA_REGION_COUNT];
};
TEST(properties, add) {
LocalPropertyTestState pa;
+ ASSERT_TRUE(pa.valid);
char propvalue[PROP_VALUE_MAX];
TEST(properties, update) {
LocalPropertyTestState pa;
+ ASSERT_TRUE(pa.valid);
char propvalue[PROP_VALUE_MAX];
prop_info *pi;
ASSERT_STREQ(propvalue, "value6");
}
-// 247 = max # of properties supported by current implementation
-// (this should never go down)
-TEST(properties, fill_247) {
+TEST(properties, fill) {
LocalPropertyTestState pa;
+ ASSERT_TRUE(pa.valid);
char prop_name[PROP_NAME_MAX];
char prop_value[PROP_VALUE_MAX];
char prop_value_ret[PROP_VALUE_MAX];
+ int count = 0;
int ret;
- for (int i = 0; i < 247; i++) {
- ret = snprintf(prop_name, PROP_NAME_MAX - 1, "property_%d", i);
+ while (true) {
+ ret = snprintf(prop_name, PROP_NAME_MAX - 1, "property_%d", count);
memset(prop_name + ret, 'a', PROP_NAME_MAX - 1 - ret);
- ret = snprintf(prop_value, PROP_VALUE_MAX - 1, "value_%d", i);
+ ret = snprintf(prop_value, PROP_VALUE_MAX - 1, "value_%d", count);
memset(prop_value + ret, 'b', PROP_VALUE_MAX - 1 - ret);
prop_name[PROP_NAME_MAX - 1] = 0;
prop_value[PROP_VALUE_MAX - 1] = 0;
- ASSERT_EQ(0, __system_property_add(prop_name, PROP_NAME_MAX - 1, prop_value, PROP_VALUE_MAX - 1));
+ ret = __system_property_add(prop_name, PROP_NAME_MAX - 1, prop_value, PROP_VALUE_MAX - 1);
+ if (ret < 0)
+ break;
+
+ count++;
}
- for (int i = 0; i < 247; i++) {
+ // For historical reasons at least 247 properties must be supported
+ ASSERT_GE(count, 247);
+
+ for (int i = 0; i < count; i++) {
ret = snprintf(prop_name, PROP_NAME_MAX - 1, "property_%d", i);
memset(prop_name + ret, 'a', PROP_NAME_MAX - 1 - ret);
ret = snprintf(prop_value, PROP_VALUE_MAX - 1, "value_%d", i);
TEST(properties, foreach) {
LocalPropertyTestState pa;
+ ASSERT_TRUE(pa.valid);
size_t count = 0;
ASSERT_EQ(0, __system_property_add("property", 8, "value1", 6));
TEST(properties, find_nth) {
LocalPropertyTestState pa;
+ ASSERT_TRUE(pa.valid);
ASSERT_EQ(0, __system_property_add("property", 8, "value1", 6));
ASSERT_EQ(0, __system_property_add("other_property", 14, "value2", 6));
TEST(properties, errors) {
LocalPropertyTestState pa;
+ ASSERT_TRUE(pa.valid);
char prop_value[PROP_NAME_MAX];
ASSERT_EQ(0, __system_property_add("property", 8, "value1", 6));
TEST(properties, serial) {
LocalPropertyTestState pa;
+ ASSERT_TRUE(pa.valid);
const prop_info *pi;
unsigned int serial;
TEST(properties, wait) {
LocalPropertyTestState pa;
+ ASSERT_TRUE(pa.valid);
unsigned int serial;
prop_info *pi;
pthread_t t;
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