hvirtual/guicast/bcipc.C

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#include "bcipc.h"
#include "bcresources.h"
#include "bcsignals.h"
#include "sema.h"
#include <signal.h>
#include <stdlib.h>
#include <sys/sem.h>
#include <sys/msg.h>
#include <sys/shm.h>





static ArrayList<int> global_shmem_db;
static ArrayList<int> global_sema_db;
static ArrayList<int> global_msg_db;
static Mutex global_ipc_lock;
static int crashed = 0;

// These must be atomic routines

int bc_enter_id(ArrayList<int>* list, int id);
int bc_remove_id(ArrayList<int>* list, int id);

void bc_ipc_termination(int signum)
{
        global_ipc_lock.lock();


        if(!crashed)
        {

#if 0
                union semun arg;
                int i;

                if(global_shmem_db.total || global_sema_db.total || global_msg_db.total)
                        printf("Crash\n");
                for(i = 0; i < global_shmem_db.total; i++)
                {
                        if(!shmctl(global_shmem_db.values[i], IPC_RMID, NULL))
                        {
                                printf("Deleted shared memory %d\n", global_shmem_db.values[i]);
                        }
                }

                for(i = 0; i < global_sema_db.total; i++)
                {
                        if(!semctl(global_sema_db.values[i], 0, IPC_RMID, arg)) 
                        {
                                printf("Deleted semaphore %d\n", global_sema_db.values[i]);
                        }
                }

                for(i = 0; i < global_msg_db.total; i++)
                {
                        if(!msgctl(global_msg_db.values[i], IPC_RMID, NULL)) 
                        {
                                printf("Deleted message %d\n", global_msg_db.values[i]);
                        }
                }

                global_shmem_db.remove_all();
                global_sema_db.remove_all();
                global_msg_db.remove_all();



#endif


// dispatch user specified signal handler
                if(BC_Resources::signal_handler) 
                        BC_Resources::signal_handler->signal_handler(signum);
                crashed = 1;
        }
        global_ipc_lock.unlock();
        exit(0);
}

int bc_init_ipc()
{
        if(signal(SIGSEGV, bc_ipc_termination) == SIG_IGN)
                signal(SIGSEGV, SIG_IGN);
        if(signal(SIGBUS, bc_ipc_termination) == SIG_IGN)
                signal(SIGBUS, SIG_IGN);
        //      SIGKILL can't be ignored
        //      if(signal(SIGKILL, bc_ipc_termination) == SIG_IGN)
        //              signal(SIGKILL, SIG_IGN);
        if(signal(SIGINT, bc_ipc_termination) == SIG_IGN)
                signal(SIGINT, SIG_IGN);
        if(signal(SIGHUP, bc_ipc_termination) == SIG_IGN)
                signal(SIGHUP, SIG_IGN);
        if(signal(SIGTERM, bc_ipc_termination) == SIG_IGN)
                signal(SIGTERM, SIG_IGN);
        return 0;
}


int bc_enter_shmem_id(int id)
{
        return bc_enter_id(&global_shmem_db, id);
}

int bc_remove_shmem_id(int id)
{
        return bc_remove_id(&global_shmem_db, id);
}

int bc_enter_sema_id(int id)
{
        return bc_enter_id(&global_sema_db, id);
}

int bc_remove_sema_id(int id)
{
        return bc_remove_id(&global_sema_db, id);
}

int bc_enter_msg_id(int id)
{
        return bc_enter_id(&global_msg_db, id);
}

int bc_remove_msg_id(int id)
{
        return bc_remove_id(&global_msg_db, id);
}

int bc_enter_id(ArrayList<int>* list, int id)
{
        int i, result = 0;
        global_ipc_lock.lock();
        for(i = 0; i < list->total; i++)
        {       
                if(list->values[i] == id) result = 1;
        }
        if(!result) list->append(id);
        global_ipc_lock.unlock();
        return 0;
}

int bc_remove_id(ArrayList<int>* list, int id)
{
        int i;
        global_ipc_lock.lock();
        for(i = 0; i < list->total; i++)
        {
                if(list->values[i] == id) list->remove_number(i);
        }
        global_ipc_lock.unlock();
        return 0;
}

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