alarm 开机时判断

/device/qcom/common/init/init_msm.c：

{    char *alarm_file = "/proc/sys/kernel/boot_reason";    char buf[BUF_SIZE];    char tmp[PROP_VALUE_MAX]="";    property_get("ro.boot.alarmboot", tmp);    if(read_file2(alarm_file, buf, sizeof(buf))) {    /*     * Setup ro.alarm_boot value to true when it is RTC triggered boot up     * For existing PMIC chips, the following mapping applies     * for the value of boot_reason:     *     * 0 -> unknown     * 1 -> hard reset     * 2 -> sudden momentary power loss (SMPL)     * 3 -> real time clock (RTC)     * 4 -> DC charger inserted     * 5 -> USB charger insertd     * 6 -> PON1 pin toggled (for secondary PMICs)     * 7 -> CBLPWR_N pin toggled (for external power supply)     * 8 -> KPDPWR_N pin toggled (power key pressed)     */        if(buf[0] == '3' || !strcmp(tmp,"true"))            property_set("ro.alarm_boot", "true");        else            property_set("ro.alarm_boot", "false");    }

AMS systemReady函数中：

startHomeActivityLocked(mCurrentUserId, "systemReady");// start the power off alarm by boot modeboolean isAlarmBoot = SystemProperties.getBoolean("ro.alarm_boot", false);if (isAlarmBoot) {    startAlarmActivityLocked();}