Android Training Course (14)

#200

#201 (;;){

#202 int nr, I, timeout =-1;

This Code enters the endless loop processing, so that the init process becomes a service.

 

#203

#204 for (I = 0; I <fd_count; I ++)

#205 ufds [I]. revents = 0;

This code clears the event count of each socket.

 

#206

#207 drain_action_queue ();

This code is the command in the execution queue.

 

#208 restart_processes ();

This code is used to determine which services need to be restarted.

 

#209

#210 if (process_needs_restart ){

#211 timeout = (process_needs_restart-gettime () * 1000;

#212 if (timeout <0)

#213 timeout = 0;

#214}

This code is used to determine the process startup timeout.

 

 

#215

#216 # if BOOTCHART

#217 if (bootchart_count> 0 ){

#218 if (timeout <0 | timeout> BOOTCHART_POLLING_MS)

#219 timeout = BOOTCHART_POLLING_MS;

#220 if (bootchart_step () <0 | -- bootchart_count = 0 ){

#221 bootchart_finish ();

#222 bootchart_count = 0;

#223}

#224}

#225 # endif

This code is used to calculate the running performance.

 

#226 nr = poll (ufds, fd_count, timeout );

#227 if (nr <= 0)

#228 continue;

This code is used to poll several Sockets for event processing.

 

#229

#230 if (ufds [2]. revents = POLLIN ){

#231/* we got a SIGCHLD-reap and restart as needed */

#232 read (signal_recv_fd, tmp, sizeof (tmp ));

#233 while (! Wait_for_one_process (0 ))

#234;

#235 continue;

#236}

This code is used to process the communication between sub-processes and delete any exited or killed processes. In this way, the system is more robust and fault-tolerant.

 

 

#237

#238 if (ufds [0]. revents = POLLIN)

#239 handle_device_fd (device_fd );

This code is used to handle device events.

 

#240

#241 if (ufds [1]. revents = POLLIN)

#242 handle_property_set_fd (property_set_fd );

This code is used to process Attribute Service events.

 

#243 if (ufds [3]. revents = POLLIN)

#244 handle_keychord (keychord_fd );

This code is a combination of buttons in debugging mode.

 

#245}

#246

#247 return 0;

#248}

#249

 

The main process of the init process has been analyzed here, and other functions will be detailed later.