Android Startup analysis-init Process &init.rc

Android Start Analysis-init process &init.rc[turn]

This article turns from: http://h1372865100.blog.163.com/blog/static/210429103201292911399594/

First, the INIT process starts

(Some native services started)

such as: ServiceManager start

Zygote start

Sysytemserver started, in

Init1

Start the Android service in the Init2 function

After the init process is up, parse init.rc and init.xxx.rc to establish basic services

After entering the loop, and not exiting

The main implementation process of init.c@/system/core/init analysis

...

mkdir ("/dev", 0755)//Create a writable directory "/dev"

。。。

Log_init (); Initializing log system

。。。

Parse_config_file ("/init.rc"); /* Parse init.rc file, parse_config_file This function is implemented in the/system/core/init/parse.c class, the analysis of the resulting service information stored in

Service_list This data deconstruction * *

Get_hardware_name ();

snprintf (TMP, sizeof (TMP), "/init.%s.rc", hardware);

Parse_config_file (TMP); /* Parse init.xxx.rc, and hardware-related * *

Action_for_each_trigger ("Early-init", Action_add_queue_tail);

Drain_action_queue (); /* Implementation of the resolution of the "Early-init" action*/

INFO ("Device init/n");

DEVICE_FD = Device_init (); /* The initialization of the device. Mount node pour/dev down and download.

firmwares*/

Property_init ();

。。。 /*property Initialization * *

/* Read/initlogo.rle (a bitmap), if the success of the/dev/graphics/fb0 display Logo, if the failure will be/dev/tty0, set to text mode and open the/dev/tty0, output text ANDROID. Concrete implementation can be seen

/system/core/init/log.c

*/

if (Load_565rle_image (Init_image_file)) {

FD = open ("/dev/tty0", o_wronly);

if (FD >= 0) {

。。。

。。。

}

/* To determine the parameters in the CmdLine and set the arguments in the property system:

* 1, if Bootmode is

*-factory, set ro.factorytest value to 1

*-Factory2, set ro.factorytest value to 2

*-Other ro.factorytest values are 0

* 2, if there are serialno parameters, then set Ro.serialno, otherwise ""

* 3, if has the Bootmod parameter, then sets Ro.bootmod, otherwise is "unknown"

* 4, if has the baseband parameter, then sets Ro.baseband, otherwise is "unknown"

* 5, if has the carrier parameter, then sets Ro.carrier, otherwise is "unknown"

* 6, if has the bootloader parameter, then sets Ro.bootloader, otherwise is "unknown"

* 7, set Ro.hardware and ro.version through global variables (previously extracted from/proc/cpuinfo).

*/

if (Qemu[0])

Import_kernel_cmdline (1);

if (!strcmp (Bootmode, "Factory"))

Property_set ("Ro.factorytest", "1");

else if (!strcmp (Bootmode, "Factory2"))

Property_set ("Ro.factorytest", "2");

Else

Property_set ("Ro.factorytest", "0");

Property_set ("Ro.serialno", Serialno[0]? Serialno: "");

Property_set ("Ro.bootmode", Bootmode[0]? Bootmode: "Unknown");

Property_set ("Ro.baseband", baseband[0]? Baseband: "Unknown");

Property_set ("Ro.carrier", Carrier[0]? Carrier: "Unknown");

Property_set ("Ro.bootloader", Bootloader[0]? Bootloader: "Unknown");

Property_set ("Ro.hardware", hardware);

SNPRINTF (TMP, Prop_value_max, "%d", revision);

Property_set ("Ro.revision", TMP);

Action_for_each_trigger ("Init", action_add_queue_tail);

Drain_action_queue (); /* Execute the parsed init action * *