cfd5b080af
Point to log/log.h where necessary, define LOG_TAG where necessary. Accept that private/android_logger.h is suitable replacement for log/logger.h and android/log.h. Correct liblog/README Effectively a cleanup and controlled select revert of 'system/core: drop or replace log/logger.h' and 'system/core: Replace log/log.h with android/log.h'. Test: compile Bug: 30465923 Change-Id: Ic2ad157bad6f5efe2c6af293a73bb753300b17a2
134 lines
3.9 KiB
C++
134 lines
3.9 KiB
C++
/*
|
|
* Copyright (C) 2009-2016 The Android Open Source Project
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
#define LOG_TAG "Service"
|
|
|
|
#include <errno.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
#include <cutils/properties.h>
|
|
#include <log/log.h>
|
|
#include <sysutils/ServiceManager.h>
|
|
|
|
ServiceManager::ServiceManager() {
|
|
}
|
|
|
|
/* The service name should not exceed SERVICE_NAME_MAX to avoid
|
|
* some weird things. This is due to the fact that:
|
|
*
|
|
* - Starting a service is done by writing its name to the "ctl.start"
|
|
* system property. This triggers the init daemon to actually start
|
|
* the service for us.
|
|
*
|
|
* - Stopping the service is done by writing its name to "ctl.stop"
|
|
* in a similar way.
|
|
*
|
|
* - Reading the status of a service is done by reading the property
|
|
* named "init.svc.<name>"
|
|
*
|
|
* If strlen(<name>) > (PROPERTY_KEY_MAX-1)-9, then you can start/stop
|
|
* the service by writing to ctl.start/stop, but you won't be able to
|
|
* read its state due to the truncation of "init.svc.<name>" into a
|
|
* zero-terminated buffer of PROPERTY_KEY_MAX characters.
|
|
*/
|
|
#define SERVICE_NAME_MAX (PROPERTY_KEY_MAX-10)
|
|
|
|
/* The maximum amount of time to wait for a service to start or stop,
|
|
* in micro-seconds (really an approximation) */
|
|
#define SLEEP_MAX_USEC 2000000 /* 2 seconds */
|
|
|
|
/* The minimal sleeping interval between checking for the service's state
|
|
* when looping for SLEEP_MAX_USEC */
|
|
#define SLEEP_MIN_USEC 200000 /* 200 msec */
|
|
|
|
int ServiceManager::start(const char *name) {
|
|
if (strlen(name) > SERVICE_NAME_MAX) {
|
|
SLOGE("Service name '%s' is too long", name);
|
|
return 0;
|
|
}
|
|
if (isRunning(name)) {
|
|
SLOGW("Service '%s' is already running", name);
|
|
return 0;
|
|
}
|
|
|
|
SLOGD("Starting service '%s'", name);
|
|
property_set("ctl.start", name);
|
|
|
|
int count = SLEEP_MAX_USEC;
|
|
while(count > 0) {
|
|
usleep(SLEEP_MIN_USEC);
|
|
count -= SLEEP_MIN_USEC;
|
|
if (isRunning(name))
|
|
break;
|
|
}
|
|
if (count <= 0) {
|
|
SLOGW("Timed out waiting for service '%s' to start", name);
|
|
errno = ETIMEDOUT;
|
|
return -1;
|
|
}
|
|
SLOGD("Sucessfully started '%s'", name);
|
|
return 0;
|
|
}
|
|
|
|
int ServiceManager::stop(const char *name) {
|
|
if (strlen(name) > SERVICE_NAME_MAX) {
|
|
SLOGE("Service name '%s' is too long", name);
|
|
return 0;
|
|
}
|
|
if (!isRunning(name)) {
|
|
SLOGW("Service '%s' is already stopped", name);
|
|
return 0;
|
|
}
|
|
|
|
SLOGD("Stopping service '%s'", name);
|
|
property_set("ctl.stop", name);
|
|
|
|
int count = SLEEP_MAX_USEC;
|
|
while(count > 0) {
|
|
usleep(SLEEP_MIN_USEC);
|
|
count -= SLEEP_MIN_USEC;
|
|
if (!isRunning(name))
|
|
break;
|
|
}
|
|
|
|
if (count <= 0) {
|
|
SLOGW("Timed out waiting for service '%s' to stop", name);
|
|
errno = ETIMEDOUT;
|
|
return -1;
|
|
}
|
|
SLOGD("Successfully stopped '%s'", name);
|
|
return 0;
|
|
}
|
|
|
|
bool ServiceManager::isRunning(const char *name) {
|
|
char propVal[PROPERTY_VALUE_MAX];
|
|
char propName[PROPERTY_KEY_MAX];
|
|
int ret;
|
|
|
|
ret = snprintf(propName, sizeof(propName), "init.svc.%s", name);
|
|
if (ret > (int)sizeof(propName)-1) {
|
|
SLOGD("Service name '%s' is too long", name);
|
|
return false;
|
|
}
|
|
|
|
if (property_get(propName, propVal, NULL)) {
|
|
if (!strcmp(propVal, "running"))
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|