FreeBSD/Linux Kernel Cross Reference
sys/servers/rs/manager.h

     /* This table has one slot per system process.  It contains information for
      * servers and driver needed by the reincarnation server to keep track of 
      * each process' status. 
      */
     
     /* Space reserved for program and arguments. */
     #define MAX_COMMAND_LEN     512         /* maximum argument string length */
     #define MAX_NR_ARGS           4         /* maximum number of arguments */
     #define MAX_RESCUE_DIR_LEN   64         /* maximum rescue dir length */
    
    /* Definition of the system process table. This table only has entries for
     * the servers and drivers, and thus is not directly indexed by slot number.
     */
    extern struct rproc {
      int r_proc_nr;                /* process slot number */
      pid_t r_pid;                  /* process id */
      dev_t r_dev_nr;               /* major device number */
      int r_dev_style;              /* device style */
    
      int r_restarts;               /* number of restarts (initially zero) */
      long r_backoff;               /* number of periods to wait before revive */
      unsigned r_flags;             /* status and policy flags */
    
      long r_period;                /* heartbeat period (or zero) */
      clock_t r_check_tm;           /* timestamp of last check */
      clock_t r_alive_tm;           /* timestamp of last heartbeat */
      clock_t r_stop_tm;            /* timestamp of SIGTERM signal */
    
      char r_cmd[MAX_COMMAND_LEN];  /* raw command plus arguments */
      char *r_argv[MAX_NR_ARGS+2];  /* parsed arguments vector */
      int r_argc;                   /* number of arguments */
    } rproc[NR_SYS_PROCS];
    
    /* Mapping for fast access to the system process table. */ 
    extern struct rproc *rproc_ptr[NR_PROCS];
    extern int nr_in_use;
    
    /* Flag values. */
    #define RS_IN_USE       0x001   /* set when process slot is in use */
    #define RS_EXITING      0x002   /* set when exit is expected */
    #define RS_REFRESHING   0x004   /* set when refresh must be done */
    
    /* Constants determining RS period and binary exponential backoff. */
    #define RS_DELTA_T       60                     /* check every T ticks */
    #define BACKOFF_BITS    (sizeof(long)*8)        /* bits in backoff field */
    #define MAX_BACKOFF     30                      /* max backoff in RS_DELTA_T */
    
    /* Magic process table addresses. */
    #define BEG_RPROC_ADDR  (&rproc[0])
    #define END_RPROC_ADDR  (&rproc[NR_SYS_PROCS])
    #define NIL_RPROC ((struct mproc *) 0)
    

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