servers/rs/manager.h

   1 /* This table has one slot per system process.  It contains information for
   2  * servers and driver needed by the reincarnation server to keep track of
   3  * each process' status.
   4  */
   5
   6 /* Space reserved for program and arguments. */
   7 #define MAX_COMMAND_LEN     512         /* maximum argument string length */
   8 #define MAX_LABEL_LEN        16         /* Unique name of (this instance of)
   9                                          * the driver
  10                                          */
  11 #define MAX_SCRIPT_LEN      256         /* maximum restart script name length */
  12 #define MAX_NR_ARGS           4         /* maximum number of arguments */
  13 #define MAX_RESCUE_DIR_LEN   64         /* maximum rescue dir length */
  14
  15 #define MAX_NR_PCI_ID         4         /* maximum number of PCI device IDs */
  16 #define MAX_NR_PCI_CLASS      4         /* maximum number of PCI class IDs */
  17 #define MAX_NR_SYSTEM         2         /* should match RSS_NR_SYSTEM */
  18
  19 /* Definition of the system process table. This table only has entries for
  20  * the servers and drivers, and thus is not directly indexed by slot number.
  21  */
  22 extern struct rproc {
  23   int r_proc_nr_e;              /* process endpoint number */
  24   pid_t r_pid;                  /* process id, -1 if the process is not there */
  25   dev_t r_dev_nr;               /* major device number */
  26   int r_dev_style;              /* device style */
  27
  28   int r_restarts;               /* number of restarts (initially zero) */
  29   long r_backoff;               /* number of periods to wait before revive */
  30   unsigned r_flags;             /* status and policy flags */
  31
  32   long r_period;                /* heartbeat period (or zero) */
  33   clock_t r_check_tm;           /* timestamp of last check */
  34   clock_t r_alive_tm;           /* timestamp of last heartbeat */
  35   clock_t r_stop_tm;            /* timestamp of SIGTERM signal */
  36   endpoint_t r_caller;          /* RS_LATEREPLY caller */
  37
  38   char *r_exec;                 /* Executable image */
  39   size_t r_exec_len;            /* Length of image */
  40
  41   char r_label[MAX_LABEL_LEN];  /* unique name of this driver */
  42   char r_cmd[MAX_COMMAND_LEN];  /* raw command plus arguments */
  43   char r_script[MAX_SCRIPT_LEN]; /* name of the restart script executable */
  44   char *r_argv[MAX_NR_ARGS+2];  /* parsed arguments vector */
  45   int r_argc;                   /* number of arguments */
  46
  47   /* Resources */
  48   int r_set_resources;
  49   struct priv r_priv;           /* Privilege structure to be passed to the
  50                                  * kernel.
  51                                  */
  52   uid_t r_uid;
  53   int r_nice;
  54   int r_nr_pci_id;              /* Number of PCI devices IDs */
  55   struct { u16_t vid; u16_t did; } r_pci_id[MAX_NR_PCI_ID];
  56   int r_nr_pci_class;           /* Number of PCI class IDs */
  57   struct { u32_t class; u32_t mask; } r_pci_class[MAX_NR_PCI_CLASS];
  58
  59   u32_t r_call_mask[MAX_NR_SYSTEM];
  60 } rproc[NR_SYS_PROCS];
  61
  62 /* Mapping for fast access to the system process table. */
  63 extern struct rproc *rproc_ptr[NR_PROCS];
  64
  65 /* Flag values. */
  66 #define RS_IN_USE       0x001   /* set when process slot is in use */
  67 #define RS_EXITING      0x004   /* set when exit is expected */
  68 #define RS_REFRESHING   0x008   /* set when refresh must be done */
  69 #define RS_NOPINGREPLY  0x010   /* driver failed to reply to a ping request */
  70 #define RS_KILLED       0x020   /* driver is killed */
  71 #define RS_CRASHED      0x040   /* driver crashed */
  72 #define RS_LATEREPLY    0x080   /* no reply sent to RS_DOWN caller yet */
  73
  74 /* Constants determining RS period and binary exponential backoff. */
  75 #define RS_DELTA_T       60                     /* check every T ticks */
  76 #define BACKOFF_BITS    (sizeof(long)*8)        /* bits in backoff field */
  77 #define MAX_BACKOFF     30                      /* max backoff in RS_DELTA_T */
  78
  79 /* Magic process table addresses. */
  80 #define BEG_RPROC_ADDR  (&rproc[0])
  81 #define END_RPROC_ADDR  (&rproc[NR_SYS_PROCS])
  82 #define NIL_RPROC ((struct mproc *) 0)
  83