main.c

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    1 /* System Information Service. 
    2  * This service handles the various debugging dumps, such as the process
    3  * table, so that these no longer directly touch kernel memory. Instead, the 
    4  * system task is asked to copy some table in local memory. 
    5  * 
    6  * Created:
    7  *   Apr 29, 2004       by Jorrit N. Herder
    8  */
    9 
   10 #include "inc.h"
   11 
   12 /* Set debugging level to 0, 1, or 2 to see no, some, all debug output. */
   13 #define DEBUG_LEVEL     1
   14 #define DPRINTF         if (DEBUG_LEVEL > 0) printf
   15 
   16 /* Allocate space for the global variables. */
   17 message m_in;           /* the input message itself */
   18 message m_out;          /* the output message used for reply */
   19 int who;                /* caller's proc number */
   20 int callnr;             /* system call number */
   21 int sys_panic;          /* flag to indicate system-wide panic */
   22 
   23 extern int errno;       /* error number set by system library */
   24 
   25 /* Declare some local functions. */
   26 FORWARD _PROTOTYPE(void init_server, (int argc, char **argv)            );
   27 FORWARD _PROTOTYPE(void exit_server, (void)                             );
   28 FORWARD _PROTOTYPE(void get_work, (void)                                );
   29 FORWARD _PROTOTYPE(void reply, (int whom, int result)                   );
   30 
   31 /*===========================================================================*
   32  *                              main                                         *
   33  *===========================================================================*/
   34 PUBLIC int main(int argc, char **argv)
   35 {
   36 /* This is the main routine of this service. The main loop consists of 
   37  * three major activities: getting new work, processing the work, and
   38  * sending the reply. The loop never terminates, unless a panic occurs.
   39  */
   40   int result;                 
   41   sigset_t sigset;
   42 
   43   /* Initialize the server, then go to work. */
   44   init_server(argc, argv);
   45 
   46   /* Main loop - get work and do it, forever. */         
   47   while (TRUE) {              
   48 
   49       /* Wait for incoming message, sets 'callnr' and 'who'. */
   50       get_work();
   51 
   52       switch (callnr) {
   53       case SYS_SIG:
   54           sigset = (sigset_t) m_in.NOTIFY_ARG;
   55           if (sigismember(&sigset,SIGTERM) || sigismember(&sigset,SIGKSTOP)) {
   56               exit_server();
   57           }
   58           continue;
   59       case PANIC_DUMPS:
   60           printf("Oops ... panic in %d.  ", who);
   61           printf("Hit F-keys for debug dumps or F12 to shut down.\n");
   62           sys_panic = TRUE;                     /* set flag to allow exit */
   63           continue;
   64       case FKEY_PRESSED:
   65           result = do_fkey_pressed(&m_in);
   66           break;
   67       case DEV_PING:
   68           notify(m_in.m_source);
   69           continue;
   70       default: 
   71           report("IS","warning, got illegal request from:", m_in.m_source);
   72           result = EINVAL;
   73       }
   74 
   75       /* Finally send reply message, unless disabled. */
   76       if (result != EDONTREPLY) {
   77           reply(who, result);
   78       }
   79   }
   80   return(OK);                           /* shouldn't come here */
   81 }
   82 
   83 /*===========================================================================*
   84  *                               init_server                                 *
   85  *===========================================================================*/
   86 PRIVATE void init_server(int argc, char **argv)
   87 {
   88 /* Initialize the information service. */
   89   int fkeys, sfkeys;
   90   int i, s;
   91   struct sigaction sigact;
   92 
   93   /* Install signal handler. Ask PM to transform signal into message. */
   94   sigact.sa_handler = SIG_MESS;
   95   sigact.sa_mask = ~0;                  /* block all other signals */
   96   sigact.sa_flags = 0;                  /* default behaviour */
   97   if (sigaction(SIGTERM, &sigact, NULL) < 0) 
   98       report("IS","warning, sigaction() failed", errno);
   99 
  100   /* Set key mappings. IS takes all of F1-F12 and Shift+F1-F6. */
  101   fkeys = sfkeys = 0;
  102   for (i=1; i<=12; i++) bit_set(fkeys, i);
  103   for (i=1; i<= 8; i++) bit_set(sfkeys, i);
  104   if ((s=fkey_map(&fkeys, &sfkeys)) != OK)
  105       report("IS", "warning, fkey_map failed:", s);
  106 }
  107 
  108 /*===========================================================================*
  109  *                              exit_server                                  *
  110  *===========================================================================*/
  111 PRIVATE void exit_server()
  112 {
  113 /* Shut down the information service. */
  114   int fkeys, sfkeys;
  115   int i,s;
  116 
  117   /* Release the function key mappings requested in init_server(). 
  118    * IS took all of F1-F12 and Shift+F1-F6. 
  119    */
  120   fkeys = sfkeys = 0;
  121   for (i=1; i<=12; i++) bit_set(fkeys, i);
  122   for (i=1; i<= 7; i++) bit_set(sfkeys, i);
  123   fkey_unmap(&fkeys, &sfkeys);
  124 
  125   /* Done. Now exit. */
  126   exit(0);
  127 }
  128 
  129 /*===========================================================================*
  130  *                              get_work                                     *
  131  *===========================================================================*/
  132 PRIVATE void get_work()
  133 {
  134     int status = 0;
  135     status = receive(ANY, &m_in);   /* this blocks until message arrives */
  136     if (OK != status)
  137         panic("IS","failed to receive message!", status);
  138     who = m_in.m_source;        /* message arrived! set sender */
  139     callnr = m_in.m_type;       /* set function call number */
  140 }
  141 
  142 /*===========================================================================*
  143  *                              reply                                        *
  144  *===========================================================================*/
  145 PRIVATE void reply(who, result)
  146 int who;                                /* destination */
  147 int result;                             /* report result to replyee */
  148 {
  149     int send_status;
  150     m_out.m_type = result;              /* build reply message */
  151     send_status = send(who, &m_out);    /* send the message */
  152     if (OK != send_status)
  153         panic("IS", "unable to send reply!", send_status);
  154 }
  155

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FreeBSD/Linux Kernel Cross Reference sys/servers/is/main.c

FreeBSD/Linux Kernel Cross Reference
sys/servers/is/main.c