78 lines
2.9 KiB
Text
78 lines
2.9 KiB
Text
|
--------------------------------------------------------------------------------
|
||
|
|
cinit commands,
|
||
|
|
Nico Schottelius 2005-04-28 (Last Modified: 2005-06-11)
|
||
|
|
--------------------------------------------------------------------------------
|
||
|
|
|
||
|
|
cinit allows communication through a socket (see ipc.thoughs for reasons).
|
||
|
|
|
||
|
|
Sockets allow to find out the accessing uid, gid and pid (uses SO_PEERCRED as
|
||
|
|
socketoption).
|
||
|
|
|
||
|
|
The communication-protocol is binary, the implementation can be found
|
||
|
|
in comm/* mostly (clients use begin_msg() and server sigio() additonally).
|
||
|
|
|
||
|
|
--------------------------------------------------------------------------------
|
||
|
|
Protocol overview
|
||
|
|
--------------------------------------------------------------------------------
|
||
|
|
|
||
|
|
Any communication begins with a command. A command is a one byte
|
||
|
|
unsigned char. Depending on the command, the communication has its own
|
||
|
|
semantics.
|
||
|
|
|
||
|
|
|
||
|
|
Commands are: (values can be found in cinit.h)
|
||
|
|
|
||
|
|
CMD_START_SVC: I want to start a service.
|
||
|
|
CMD_CHG_STATUS: I want to change the status of a service.
|
||
|
|
CMD_STOP_SVC: Please shutdown a service. **)
|
||
|
|
|
||
|
|
CMD_RESCUE: Kill everything, and spawn a sulogin shell.**)
|
||
|
|
CMD_INIT: Start all services (again possibly).**)
|
||
|
|
|
||
|
|
CMD_HALT: Halt the system*)
|
||
|
|
CMD_REBOOT: Reboot the system*)
|
||
|
|
CMD_POWEROFF: Power-off the system*)
|
||
|
|
|
||
|
|
*) The commands are not and maybe will never be implemented,
|
||
|
|
as they are realized another way (using signals).
|
||
|
|
|
||
|
|
**) Not yet implemented.
|
||
|
|
|
||
|
|
--------------------------------------------------------------------------------
|
||
|
|
Detailled command-listing
|
||
|
|
--------------------------------------------------------------------------------
|
||
|
|
|
||
|
|
CMD_START_SVC
|
||
|
|
1. int len; /* length of service name, including \0 */
|
||
|
|
2. char *svc; /* name of the service, absolute pathname */
|
||
|
|
|
||
|
|
cinit returns:
|
||
|
|
a) status of service
|
||
|
|
b) fail
|
||
|
|
|
||
|
|
CMD_CHG_STATUS: I want to change the status of a service.
|
||
|
|
0. int len;
|
||
|
|
1. char *svc;
|
||
|
|
2. char status; /* status:
|
||
|
|
once: started successfully the service once.
|
||
|
|
fail: tried to start once, but the service exit ungracefully
|
||
|
|
respawn: I am on it, as soon it exists I'll restart! */
|
||
|
|
2. pid_t pid /* the pid of the service, if started once
|
||
|
|
or the pid of the service watcher, if respawning */
|
||
|
|
|
||
|
|
cinit returns: MSG_OK|MSG_FAIL (char)
|
||
|
|
|
||
|
|
CMD_STOP_SVC: Please shutdown a service and its dependencies.
|
||
|
|
1. int len; /* length of service name, including \0 */
|
||
|
|
2. char *svc; /* name of the service, absolute pathname */
|
||
|
|
|
||
|
|
cinit returns: Status of service (should be ST_OFF)
|
||
|
|
|
||
|
|
|
||
|
|
The following commands do not return anything nor do they need any parameter:
|
||
|
|
|
||
|
|
CMD_RESCUE: Kill everything, and spawn a sulogin shell. Irreversible.
|
||
|
|
CMD_HALT: Halt the system.
|
||
|
|
CMD_REBOOT: Reboot the system.
|
||
|
|
CMD_POWEROFF: Power-off the system.
|