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#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <errno.h>
#include <cutils/properties.h>
#include <cutils/hashmap.h>
#include <sys/atomics.h>
#define _REALLY_INCLUDE_SYS__SYSTEM_PROPERTIES_H_
#include <sys/_system_properties.h>
static int str_hash(void *key)
{
return hashmapHash(key, strlen(key));
}
static bool str_equals(void *keyA, void *keyB)
{
return strcmp(keyA, keyB) == 0;
}
static void announce(char *name, char *value)
{
char *x;
for(x = value; *x; x++) {
if((*x < 32) || (*x > 127)) *x = '.';
}
fprintf(stderr,"%10d %s = '%s'\n", (int) time(0), name, value);
}
static void add_to_watchlist(Hashmap *watchlist, const char *name,
const prop_info *pi)
{
char *key = strdup(name);
unsigned *value = malloc(sizeof(unsigned));
if (!key || !value)
exit(1);
*value = __system_property_serial(pi);
hashmapPut(watchlist, key, value);
}
static void populate_watchlist(const prop_info *pi, void *cookie)
{
Hashmap *watchlist = cookie;
char name[PROP_NAME_MAX];
char value_unused[PROP_VALUE_MAX];
__system_property_read(pi, name, value_unused);
add_to_watchlist(watchlist, name, pi);
}
static void update_watchlist(const prop_info *pi, void *cookie)
{
Hashmap *watchlist = cookie;
char name[PROP_NAME_MAX];
char value[PROP_VALUE_MAX];
unsigned *serial;
__system_property_read(pi, name, value);
serial = hashmapGet(watchlist, name);
if (!serial) {
add_to_watchlist(watchlist, name, pi);
announce(name, value);
} else {
unsigned tmp = __system_property_serial(pi);
if (*serial != tmp) {
*serial = tmp;
announce(name, value);
}
}
}
int watchprops_main(int argc, char *argv[])
{
unsigned serial = 0;
unsigned count = 0;
unsigned n;
Hashmap *watchlist = hashmapCreate(1024, str_hash, str_equals);
if (!watchlist)
exit(1);
__system_property_foreach(populate_watchlist, watchlist);
for(;;) {
serial = __system_property_wait_any(serial);
__system_property_foreach(update_watchlist, watchlist);
}
return 0;
}
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