1f5841c8ed
SYSLIB CHANGES: - SEF must be used by every system process and is thereby part of the system library. - The framework provides a receive() interface (sef_receive) for system processes to automatically catch known system even messages and process them. - SEF provides a default behavior for each type of system event, but allows system processes to register callbacks to override the default behavior. - Custom (local to the process) or predefined (provided by SEF) callback implementations can be registered to SEF. - SEF currently includes support for 2 types of system events: 1. SEF Ping. The event occurs every time RS sends a ping to figure out whether a system process is still alive. The default callback implementation provided by SEF is to notify RS back to let it know the process is alive and kicking. 2. SEF Live update. The event occurs every time RS sends a prepare to update message to let a system process know an update is available and to prepare for it. The live update support is very basic for now. SEF only deals with verifying if the prepare state can be supported by the process, dumping the state for debugging purposes, and providing an event-driven programming model to the process to react to state changes check-in when ready to update. - SEF should be extended in the future to integrate support for more types of system events. Ideally, all the cross-cutting concerns should be integrated into SEF to avoid duplicating code and ease extensibility. Examples include: * PM notify messages primarily used at shutdown. * SYSTEM notify messages primarily used for signals. * CLOCK notify messages used for system alarms. * Debug messages. IS could still be in charge of fkey handling but would forward the debug message to the target process (e.g. PM, if the user requested debug information about PM). SEF would then catch the message and do nothing unless the process has registered an appropriate callback to deal with the event. This simplifies the programming model to print debug information, avoids duplicating code, and reduces the effort to print debug information. SYSTEM PROCESSES CHANGES: - Every system process registers SEF callbacks it needs to override the default system behavior and calls sef_startup() right after being started. - sef_startup() does almost nothing now, but will be extended in the future to support callbacks of its own to let RS control and synchronize with every system process at initialization time. - Every system process calls sef_receive() now rather than receive() directly, to let SEF handle predefined system events. RS CHANGES: - RS supports a basic single-component live update protocol now, as follows: * When an update command is issued (via "service update *"), RS notifies the target system process to prepare for a specific update state. * If the process doesn't respond back in time, the update is aborted. * When the process responds back, RS kills it and marks it for refreshing. * The process is then automatically restarted as for a buggy process and can start running again. * Live update is currently prototyped as a controlled failure.
87 lines
3 KiB
C
87 lines
3 KiB
C
/* Type definitions used in RS.
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*/
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#ifndef RS_TYPE_H
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#define RS_TYPE_H
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/* Definition of an entry of the boot image priv table. */
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struct boot_image_priv {
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endpoint_t endpoint; /* process endpoint number */
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int flags; /* privilege flags */
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short trap_mask; /* allowed system call traps */
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int ipc_to; /* send mask protection */
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int *k_calls; /* kernel call protection */
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};
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/* Definition of an entry of the boot image sys table. */
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struct boot_image_sys {
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endpoint_t endpoint; /* process endpoint number */
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int flags; /* system flags */
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};
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/* Definition of an entry of the boot image dev table. */
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struct boot_image_dev {
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endpoint_t endpoint; /* process endpoint number */
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dev_t dev_nr; /* major device number */
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int dev_style; /* device style */
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long period; /* heartbeat period (or zero) */
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};
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/* Definition of an entry of the system process table. */
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struct rproc {
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endpoint_t r_proc_nr_e; /* process endpoint number */
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pid_t r_pid; /* process id, -1 if the process is not there */
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dev_t r_dev_nr; /* major device number */
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int r_dev_style; /* device style */
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int r_restarts; /* number of restarts (initially zero) */
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long r_backoff; /* number of periods to wait before revive */
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unsigned r_flags; /* status and policy flags */
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unsigned r_sys_flags; /* sys flags */
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long r_period; /* heartbeat period (or zero) */
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clock_t r_check_tm; /* timestamp of last check */
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clock_t r_alive_tm; /* timestamp of last heartbeat */
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clock_t r_stop_tm; /* timestamp of SIGTERM signal */
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endpoint_t r_caller; /* RS_LATEREPLY caller */
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char *r_exec; /* Executable image */
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size_t r_exec_len; /* Length of image */
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char r_label[MAX_LABEL_LEN]; /* unique name of this service */
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char r_cmd[MAX_COMMAND_LEN]; /* raw command plus arguments */
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char r_script[MAX_SCRIPT_LEN]; /* name of the restart script executable */
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char *r_argv[MAX_NR_ARGS+2]; /* parsed arguments vector */
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int r_argc; /* number of arguments */
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/* Resources */
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int r_set_resources;
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struct priv r_priv; /* Privilege structure to be passed to the
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* kernel.
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*/
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uid_t r_uid;
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int r_nice;
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int r_nr_pci_id; /* Number of PCI devices IDs */
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struct { u16_t vid; u16_t did; } r_pci_id[RSS_NR_PCI_ID];
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int r_nr_pci_class; /* Number of PCI class IDs */
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struct { u32_t class; u32_t mask; } r_pci_class[RSS_NR_PCI_CLASS];
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u32_t r_call_mask[RSS_NR_SYSTEM];
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char r_ipc_list[MAX_IPC_LIST];
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bitchunk_t r_vm[RSS_VM_CALL_SIZE];
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int r_nr_control;
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char r_control[RSS_NR_CONTROL][MAX_LABEL_LEN];
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};
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/* Definition of the global update descriptor. */
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struct rupdate {
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int flags; /* flags to keep track of the status of the update */
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clock_t prepare_tm; /* timestamp of when the update was scheduled */
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clock_t prepare_maxtime; /* max time to wait for the process to be ready */
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struct rproc *rp; /* the process under update */
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};
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#endif /* RS_TYPE_H */
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