Android Training Course (39)

<! -- @ Page {margin: 2 cm} P {margin-bottom: 0.21} -->

In the init. rc file, you can see the following services loaded:

Service installd/system/bin/installd

Socket installd stream 600 system

The code of the installd service is in the directory:

Android-2.0/frameworks/base/cmds/installd

 

Installd is a service for installing dex files.

Its main entry function code is as follows:

Int main (const int argc, const char * argv []) {

Char buf [BUFFER_MAX];

Struct sockaddr addr;

Socklen_t alen;

Int lsocket, s, count;

 

Create a controlled SOCKET.

Lsocket = android_get_control_socket (SOCKET_PATH );

If (lsocket <0 ){

LOGE ("Failed to get socket from environment: % s", strerror (errno ));

Exit (1 );

}

 

Listen to this SOCKET.

If (listen (lsocket, 5 )){

LOGE ("Listen on socket failed: % s", strerror (errno ));

Exit (1 );

}

Fcntl (lsocket, F_SETFD, FD_CLOEXEC );

 

Process the received SOCKET connection in a loop.

 

For (;;){

Alen = sizeof (addr );

S = accept (lsocket, & addr, & alen );

If (s <0 ){

LOGE ("Accept failed: % s", strerror (errno ));

Continue;

}

Fcntl (s, F_SETFD, FD_CLOEXEC );

 

Receive and process commands from the new connection.

LOGI ("new connection ");

For (;;){

Unsigned short count;

If (readx (s, & count, sizeof (count ))){

LOGE ("failed to read size ");

Break;

}

If (count <1) | (count> = BUFFER_MAX )){

LOGE ("invalid size % d", count );

Break;

}

If (readx (s, buf, count )){

LOGE ("failed to read command ");

Break;

}

Buf [count] = 0;

If (execute (s, buf) break;

}

LOGI ("closing connection ");

Close (s );

}

 

Return 0;

}