4924d1a9b5
- add new "control" config directive, to let drivers restart drivers (by Jorrit Herder) - fix bug causing system processes to be started twice sometimes
96 lines
3.8 KiB
C
96 lines
3.8 KiB
C
/* This table has one slot per system process. It contains information for
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* servers and driver needed by the reincarnation server to keep track of
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* each process' status.
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*/
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/* Space reserved for program and arguments. */
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#define MAX_COMMAND_LEN 512 /* maximum argument string length */
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#define MAX_LABEL_LEN 16 /* Unique name of (this instance of)
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* the driver
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*/
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#define MAX_SCRIPT_LEN 256 /* maximum restart script name length */
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#define MAX_NR_ARGS 4 /* maximum number of arguments */
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#define MAX_RESCUE_DIR_LEN 64 /* maximum rescue dir length */
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#define MAX_IPC_LIST 256 /* Max size of list for IPC target
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* process names
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*/
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#define MAX_VM_LIST 256
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/* Definition of the system process table. This table only has entries for
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* the servers and drivers, and thus is not directly indexed by slot number.
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*/
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extern struct rproc {
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int 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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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 driver */
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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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} rproc[NR_SYS_PROCS];
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/* Mapping for fast access to the system process table. */
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extern struct rproc *rproc_ptr[NR_PROCS];
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/* Pipe for detection of exec failures. The pipe is close-on-exec, and
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* no data will be written to the pipe if the exec succeeds. After an
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* exec failure, the slot number is written to the pipe. After each exit,
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* a non-blocking read retrieves the slot number from the pipe.
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*/
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int exec_pipe[2];
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/* Flag values. */
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#define RS_IN_USE 0x001 /* set when process slot is in use */
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#define RS_EXITING 0x004 /* set when exit is expected */
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#define RS_REFRESHING 0x008 /* set when refresh must be done */
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#define RS_NOPINGREPLY 0x010 /* driver failed to reply to a ping request */
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#define RS_KILLED 0x020 /* driver is killed */
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#define RS_CRASHED 0x040 /* driver crashed */
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#define RS_LATEREPLY 0x080 /* no reply sent to RS_DOWN caller yet */
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#define RS_SIGNALED 0x100 /* driver crashed */
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/* Constants determining RS period and binary exponential backoff. */
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#define RS_DELTA_T 60 /* check every T ticks */
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#define BACKOFF_BITS (sizeof(long)*8) /* bits in backoff field */
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#define MAX_BACKOFF 30 /* max backoff in RS_DELTA_T */
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/* Magic process table addresses. */
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#define BEG_RPROC_ADDR (&rproc[0])
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#define END_RPROC_ADDR (&rproc[NR_SYS_PROCS])
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#define NIL_RPROC ((struct mproc *) 0)
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