ctl.start
通过 property_set(“ctl.start”, service_xx) 来启动 init.rc 中的 service 是一个很方便方法来调用某个可执行程序或某个脚本程序
Demo 1
package com.android.settings;
public class DevelopmentSettings {
private void writeLogdSizeOption(Object newValue) {
SystemProperties.set("ctl.start", "logd-reinit");
}
}
system/etc/init/logd.rc
service logd /system/bin/logd
socket logd stream 0666 logd logd
socket logdr seqpacket 0666 logd logd
socket logdw dgram 0222 logd logd
group root system readproc
writepid /dev/cpuset/system-background/tasks
service logd-reinit /system/bin/logd --reinit
oneshot
disabled
writepid /dev/cpuset/system-background/tasks
Demo 2
public class SystemService {
/** Request that the init daemon start a named service. */
public static void start(String name) {
SystemProperties.set("ctl.start", name);
}
}
public final class ActivityManagerService extends ActivityManagerNative
implements Watchdog.Monitor, BatteryStatsImpl.BatteryCallback {
public void requestBugReport(int bugreportType) {
String service = null;
switch (bugreportType) {
case ActivityManager.BUGREPORT_OPTION_FULL:
service = "bugreport";
break;
case ActivityManager.BUGREPORT_OPTION_INTERACTIVE:
service = "bugreportplus";
break;
case ActivityManager.BUGREPORT_OPTION_REMOTE:
service = "bugreportremote";
break;
case ActivityManager.BUGREPORT_OPTION_WEAR:
service = "bugreportwear";
break;
case ActivityManager.BUGREPORT_OPTION_TELEPHONY:
service = "bugreportelefony";
break;
}
if (service == null) {
throw new IllegalArgumentException("Provided bugreport type is not correct, value: "
+ bugreportType);
}
enforceCallingPermission(android.Manifest.permission.DUMP, "requestBugReport");
SystemProperties.set("ctl.start", service);
}
}
./system/etc/init/dumpstate.rc
on boot
# Allow bugreports access to eMMC 5.0 stats
chown root mount /sys/kernel/debug/mmc0/mmc0:0001/ext_csd
chmod 0440 /sys/kernel/debug/mmc0/mmc0:0001/ext_csd
service dumpstate /system/bin/dumpstate -s
class main
socket dumpstate stream 0660 shell log
disabled
oneshot
# dumpstatez generates a zipped bugreport but also uses a socket to print the file location once
# it is finished.
service dumpstatez /system/bin/dumpstate -S -d -z \
-o /data/user_de/0/com.android.shell/files/bugreports/bugreport
socket dumpstate stream 0660 shell log
class main
disabled
oneshot
# bugreportplus is an enhanced version of bugreport that provides a better
# user interface (like displaying progress and allowing user to enter details).
# It's typically triggered by the power button or developer settings.
service bugreportplus /system/bin/dumpstate -d -B -P -z \
-o /data/user_de/0/com.android.shell/files/bugreports/bugreport
class main
disabled
oneshot
Demo 3
frameworks/native/services/surfaceflinger/SurfaceFlinger.cpp
void SurfaceFlinger::init() {
// start boot animation
startBootAnim();
}
void SurfaceFlinger::startBootAnim() {
// start boot animation
property_set("service.bootanim.exit", "0");
property_set("ctl.start", "bootanim");
}
./system/etc/init/bootanim.rc
service bootanim /system/bin/bootanimation
class core
user graphics
group graphics audio
disabled
oneshot
writepid /dev/stune/top-app/tasks
