77 lines
1.7 KiB
C
77 lines
1.7 KiB
C
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#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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#include <cutils/properties.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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extern prop_area *__system_property_area__;
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typedef struct pwatch pwatch;
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struct pwatch
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{
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const prop_info *pi;
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unsigned serial;
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};
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static pwatch watchlist[1024];
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static void announce(const prop_info *pi)
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{
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char name[PROP_NAME_MAX];
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char value[PROP_VALUE_MAX];
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char *x;
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__system_property_read(pi, name, value);
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for(x = value; *x; x++) {
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if((*x < 32) || (*x > 127)) *x = '.';
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}
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fprintf(stderr,"%10d %s = '%s'\n", (int) time(0), name, value);
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}
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int watchprops_main(int argc, char *argv[])
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{
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prop_area *pa = __system_property_area__;
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unsigned serial = pa->serial;
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unsigned count = pa->count;
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unsigned n;
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if(count >= 1024) exit(1);
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for(n = 0; n < count; n++) {
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watchlist[n].pi = __system_property_find_nth(n);
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watchlist[n].serial = watchlist[n].pi->serial;
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}
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for(;;) {
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do {
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__futex_wait(&pa->serial, serial, 0);
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} while(pa->serial == serial);
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while(count < pa->count){
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watchlist[count].pi = __system_property_find_nth(count);
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watchlist[count].serial = watchlist[n].pi->serial;
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announce(watchlist[count].pi);
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count++;
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if(count == 1024) exit(1);
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}
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for(n = 0; n < count; n++){
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unsigned tmp = watchlist[n].pi->serial;
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if(watchlist[n].serial != tmp) {
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announce(watchlist[n].pi);
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watchlist[n].serial = tmp;
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}
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}
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}
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return 0;
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}
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