guicast/bcipc.C

   1 #include "bcipc.h"
   2 #include "bcresources.h"
   3 #include "bcsignals.h"
   4 #include "sema.h"
   5 #include <signal.h>
   6 #include <stdlib.h>
   7 #include <sys/sem.h>
   8 #include <sys/msg.h>
   9 #include <sys/shm.h>
  10
  11
  12
  13
  14
  15 static ArrayList<int> global_shmem_db;
  16 static ArrayList<int> global_sema_db;
  17 static ArrayList<int> global_msg_db;
  18 static Mutex global_ipc_lock;
  19 static int crashed = 0;
  20
  21 // These must be atomic routines
  22
  23 int bc_enter_id(ArrayList<int>* list, int id);
  24 int bc_remove_id(ArrayList<int>* list, int id);
  25
  26 void bc_ipc_termination(int signum)
  27 {
  28         global_ipc_lock.lock();
  29
  30
  31         if(!crashed)
  32         {
  33
  34 #if 0
  35                 union semun arg;
  36                 int i;
  37
  38                 if(global_shmem_db.total || global_sema_db.total || global_msg_db.total)
  39                         printf("Crash\n");
  40                 for(i = 0; i < global_shmem_db.total; i++)
  41                 {
  42                         if(!shmctl(global_shmem_db.values[i], IPC_RMID, NULL))
  43                         {
  44                                 printf("Deleted shared memory %d\n", global_shmem_db.values[i]);
  45                         }
  46                 }
  47
  48                 for(i = 0; i < global_sema_db.total; i++)
  49                 {
  50                         if(!semctl(global_sema_db.values[i], 0, IPC_RMID, arg))
  51                         {
  52                                 printf("Deleted semaphore %d\n", global_sema_db.values[i]);
  53                         }
  54                 }
  55
  56                 for(i = 0; i < global_msg_db.total; i++)
  57                 {
  58                         if(!msgctl(global_msg_db.values[i], IPC_RMID, NULL))
  59                         {
  60                                 printf("Deleted message %d\n", global_msg_db.values[i]);
  61                         }
  62                 }
  63
  64                 global_shmem_db.remove_all();
  65                 global_sema_db.remove_all();
  66                 global_msg_db.remove_all();
  67
  68
  69
  70 #endif
  71
  72
  73 // dispatch user specified signal handler
  74                 if(BC_Resources::signal_handler)
  75                         BC_Resources::signal_handler->signal_handler(signum);
  76                 crashed = 1;
  77         }
  78         global_ipc_lock.unlock();
  79         exit(0);
  80 }
  81
  82 int bc_init_ipc()
  83 {
  84         if(signal(SIGSEGV, bc_ipc_termination) == SIG_IGN)
  85                 signal(SIGSEGV, SIG_IGN);
  86         if(signal(SIGBUS, bc_ipc_termination) == SIG_IGN)
  87                 signal(SIGBUS, SIG_IGN);
  88         //      SIGKILL can't be ignored
  89         //      if(signal(SIGKILL, bc_ipc_termination) == SIG_IGN)
  90         //              signal(SIGKILL, SIG_IGN);
  91         if(signal(SIGINT, bc_ipc_termination) == SIG_IGN)
  92                 signal(SIGINT, SIG_IGN);
  93         if(signal(SIGHUP, bc_ipc_termination) == SIG_IGN)
  94                 signal(SIGHUP, SIG_IGN);
  95         if(signal(SIGTERM, bc_ipc_termination) == SIG_IGN)
  96                 signal(SIGTERM, SIG_IGN);
  97         return 0;
  98 }
  99
 100
 101 int bc_enter_shmem_id(int id)
 102 {
 103         return bc_enter_id(&global_shmem_db, id);
 104 }
 105
 106 int bc_remove_shmem_id(int id)
 107 {
 108         return bc_remove_id(&global_shmem_db, id);
 109 }
 110
 111 int bc_enter_sema_id(int id)
 112 {
 113         return bc_enter_id(&global_sema_db, id);
 114 }
 115
 116 int bc_remove_sema_id(int id)
 117 {
 118         return bc_remove_id(&global_sema_db, id);
 119 }
 120
 121 int bc_enter_msg_id(int id)
 122 {
 123         return bc_enter_id(&global_msg_db, id);
 124 }
 125
 126 int bc_remove_msg_id(int id)
 127 {
 128         return bc_remove_id(&global_msg_db, id);
 129 }
 130
 131 int bc_enter_id(ArrayList<int>* list, int id)
 132 {
 133         int i, result = 0;
 134         global_ipc_lock.lock();
 135         for(i = 0; i < list->total; i++)
 136         {
 137                 if(list->values[i] == id) result = 1;
 138         }
 139         if(!result) list->append(id);
 140         global_ipc_lock.unlock();
 141         return 0;
 142 }
 143
 144 int bc_remove_id(ArrayList<int>* list, int id)
 145 {
 146         int i;
 147         global_ipc_lock.lock();
 148         for(i = 0; i < list->total; i++)
 149         {
 150                 if(list->values[i] == id) list->remove_number(i);
 151         }
 152         global_ipc_lock.unlock();
 153         return 0;
 154 }
 155