1 files changed, 76 insertions, 0 deletions
diff --git a/toolbox/watchprops.c b/toolbox/watchprops.c
new file mode 100644
index 000000000..d3119924b
--- /dev/null
+++ b/toolbox/watchprops.c
@@ -0,0 +1,76 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+
+#include <cutils/properties.h>
+
+#include <sys/atomics.h>
+
+#define _REALLY_INCLUDE_SYS__SYSTEM_PROPERTIES_H_
+#include <sys/_system_properties.h>
+
+
+extern prop_area *__system_property_area__;
+
+typedef struct pwatch pwatch;
+
+struct pwatch
+{
+    const prop_info *pi;
+    unsigned serial;
+};
+
+static pwatch watchlist[1024];
+
+static void announce(const prop_info *pi)
+{
+    char name[PROP_NAME_MAX];
+    char value[PROP_VALUE_MAX];
+    char *x;
+    
+    __system_property_read(pi, name, value);
+
+    for(x = value; *x; x++) {
+        if((*x < 32) || (*x > 127)) *x = '.';
+    }
+
+    fprintf(stderr,"%10d %s = '%s'\n", (int) time(0), name, value);
+}
+
+int watchprops_main(int argc, char *argv[])
+{
+    prop_area *pa = __system_property_area__;
+    unsigned serial = pa->serial;
+    unsigned count = pa->count;
+    unsigned n;
+    
+    if(count >= 1024) exit(1);
+
+    for(n = 0; n < count; n++) {
+        watchlist[n].pi = __system_property_find_nth(n);
+        watchlist[n].serial = watchlist[n].pi->serial;
+    }
+
+    for(;;) {
+        do {
+            __futex_wait(&pa->serial, serial, 0);
+        } while(pa->serial == serial);
+
+        while(count < pa->count){
+            watchlist[count].pi = __system_property_find_nth(count);
+            watchlist[count].serial = watchlist[n].pi->serial;
+            announce(watchlist[count].pi);
+            count++;
+            if(count == 1024) exit(1);
+        }
+
+        for(n = 0; n < count; n++){
+            unsigned tmp = watchlist[n].pi->serial;
+            if(watchlist[n].serial != tmp) {
+                announce(watchlist[n].pi);
+                watchlist[n].serial = tmp;
+            }
+        }
+    }
+    return 0;
+}