73 lines
2.8 KiB
Text
73 lines
2.8 KiB
Text
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cinit commands,
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Nico Schottelius 2005-04-28 (Last Modified: 2005-06-11)
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cinit allows communication through a socket (see ipc.thoughs for reasons).
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Sockets allow to find out the accessing uid, gid and pid (using SO_PEERCRED as
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socketoption).
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The communication-protocol is binary, the implementation can be found
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in comm/* mostly (clients use begin_msg() and server sigio() additonally).
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Protocol overview
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Any communication begins with a command. A command is a one byte
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unsigned char. Depending on the command, the communication has its own
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semantics.
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Commands are: (values can be found in cinit.h)
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CMD_START_SVC: I want to start a service.
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CMD_CHG_STATUS: I want to change the status of a service.
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CMD_STOP_SVC: Please shutdown a service.
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CMD_RESCUE: Kill everything, and spawn a sulogin shell.
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CMD_UPDATE: Hot-reboot system and reload cinit.
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CMD_HALT: Halt the system
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CMD_REBOOT: Reboot the system
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CMD_POWEROFF: Power-off the system
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Detailled command-listing
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CMD_START_SVC
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1. int len; /* length of service name, including \0 */
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2. char *svc; /* name of the service, absolute pathname */
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cinit returns:
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a) status of service
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b) fail
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CMD_CHG_STATUS: I want to change the status of a service.
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0. int len;
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1. char *svc;
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2. char status; /* status:
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once: started successfully the service once.
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fail: tried to start once, but the service exit ungracefully
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respawn: I am on it, as soon it exists I'll restart! */
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2. pid_t pid /* the pid of the service, if started once
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or the pid of the service watcher, if respawning */
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cinit returns: MSG_OK|MSG_FAIL (char)
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CMD_STOP_SVC: Please shutdown a service and its dependencies.
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1. int len; /* length of service name, including \0 */
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2. char *svc; /* name of the service, absolute pathname */
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cinit returns: Status of service (should be ST_OFF)
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The following commands do not return anything nor do they need any parameter:
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CMD_RESCUE: Kill everything, and spawn a sulogin shell. Irreversible.
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CMD_HALT: Halt the system.
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CMD_REBOOT: Reboot the system.
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CMD_POWEROFF: Power-off the system.
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CMD_UPDATE: Update cinit, hot-reboot the system.
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