diff options
Diffstat (limited to 'toolbox/watchprops.c')
-rw-r--r-- | toolbox/watchprops.c | 76 |
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 @@ | |||
1 | #include <stdio.h> | ||
2 | #include <stdlib.h> | ||
3 | #include <time.h> | ||
4 | |||
5 | #include <cutils/properties.h> | ||
6 | |||
7 | #include <sys/atomics.h> | ||
8 | |||
9 | #define _REALLY_INCLUDE_SYS__SYSTEM_PROPERTIES_H_ | ||
10 | #include <sys/_system_properties.h> | ||
11 | |||
12 | |||
13 | extern prop_area *__system_property_area__; | ||
14 | |||
15 | typedef struct pwatch pwatch; | ||
16 | |||
17 | struct pwatch | ||
18 | { | ||
19 | const prop_info *pi; | ||
20 | unsigned serial; | ||
21 | }; | ||
22 | |||
23 | static pwatch watchlist[1024]; | ||
24 | |||
25 | static void announce(const prop_info *pi) | ||
26 | { | ||
27 | char name[PROP_NAME_MAX]; | ||
28 | char value[PROP_VALUE_MAX]; | ||
29 | char *x; | ||
30 | |||
31 | __system_property_read(pi, name, value); | ||
32 | |||
33 | for(x = value; *x; x++) { | ||
34 | if((*x < 32) || (*x > 127)) *x = '.'; | ||
35 | } | ||
36 | |||
37 | fprintf(stderr,"%10d %s = '%s'\n", (int) time(0), name, value); | ||
38 | } | ||
39 | |||
40 | int watchprops_main(int argc, char *argv[]) | ||
41 | { | ||
42 | prop_area *pa = __system_property_area__; | ||
43 | unsigned serial = pa->serial; | ||
44 | unsigned count = pa->count; | ||
45 | unsigned n; | ||
46 | |||
47 | if(count >= 1024) exit(1); | ||
48 | |||
49 | for(n = 0; n < count; n++) { | ||
50 | watchlist[n].pi = __system_property_find_nth(n); | ||
51 | watchlist[n].serial = watchlist[n].pi->serial; | ||
52 | } | ||
53 | |||
54 | for(;;) { | ||
55 | do { | ||
56 | __futex_wait(&pa->serial, serial, 0); | ||
57 | } while(pa->serial == serial); | ||
58 | |||
59 | while(count < pa->count){ | ||
60 | watchlist[count].pi = __system_property_find_nth(count); | ||
61 | watchlist[count].serial = watchlist[n].pi->serial; | ||
62 | announce(watchlist[count].pi); | ||
63 | count++; | ||
64 | if(count == 1024) exit(1); | ||
65 | } | ||
66 | |||
67 | for(n = 0; n < count; n++){ | ||
68 | unsigned tmp = watchlist[n].pi->serial; | ||
69 | if(watchlist[n].serial != tmp) { | ||
70 | announce(watchlist[n].pi); | ||
71 | watchlist[n].serial = tmp; | ||
72 | } | ||
73 | } | ||
74 | } | ||
75 | return 0; | ||
76 | } | ||