ServiceManager.cpp revision 7e8529a8b528fd30586aa037f15a31b29582c537 
1#include <errno.h>
2
3#include <sysutils/ServiceManager.h>
4
5#define LOG_TAG "Service"
6#include <cutils/log.h>
7#include <cutils/properties.h>
8
9ServiceManager::ServiceManager() {
10}
11
12int ServiceManager::start(const char *name) {
13    if (isRunning(name)) {
14        SLOGW("Service '%s' is already running", name);
15        return 0;
16    }
17
18    SLOGD("Starting service '%s'", name);
19    property_set("ctl.start", name);
20
21    int count = 200;
22    while(count--) {
23        sched_yield();
24        if (isRunning(name))
25            break;
26    }
27    if (!count) {
28        SLOGW("Timed out waiting for service '%s' to start", name);
29        errno = ETIMEDOUT;
30        return -1;
31    }
32    SLOGD("Sucessfully started '%s'", name);
33    return 0;
34}
35
36int ServiceManager::stop(const char *name) {
37    if (!isRunning(name)) {
38        SLOGW("Service '%s' is already stopped", name);
39        return 0;
40    }
41
42    SLOGD("Stopping service '%s'", name);
43    property_set("ctl.stop", name);
44
45    int count = 200;
46    while(count--) {
47        sched_yield();
48        if (!isRunning(name))
49            break;
50    }
51
52    if (!count) {
53        SLOGW("Timed out waiting for service '%s' to stop", name);
54        errno = ETIMEDOUT;
55        return -1;
56    }
57    SLOGD("Sucessfully stopped '%s'", name);
58    return 0;
59}
60
61bool ServiceManager::isRunning(const char *name) {
62    char propVal[PROPERTY_VALUE_MAX];
63    char propName[255];
64
65    snprintf(propName, sizeof(propVal), "init.svc.%s", name);
66
67
68    if (property_get(propName, propVal, NULL)) {
69        if (!strcmp(propVal, "running"))
70            return true;
71    }
72    return false;
73}
74