static gboolean
publish_session_bus (const char *address)
{
HANDLE init_mutex;
init_mutex = acquire_mutex (UNIQUE_DBUS_INIT_MUTEX);
published_daemon_mutex = CreateMutexA (NULL, FALSE, DBUS_DAEMON_MUTEX);
if (WaitForSingleObject (published_daemon_mutex, 10 ) != WAIT_OBJECT_0)
{
release_mutex (init_mutex);
CloseHandle (published_daemon_mutex);
published_daemon_mutex = NULL;
return FALSE;
}
published_shared_mem = set_shm (DBUS_DAEMON_ADDRESS_INFO, address);
if (!published_shared_mem)
{
release_mutex (init_mutex);
CloseHandle (published_daemon_mutex);
published_daemon_mutex = NULL;
return FALSE;
}
release_mutex (init_mutex);
return TRUE;
}
int main()
{
mknod("sc_ctos", S_IFIFO|0666, 0);
mknod("sc_svtoc", S_IFIFO|0666, 0);
signal(SIGUSR1, sigHandler_add_serv);
int ctos = open("sc_ctos", O_RDONLY);
int svtoc = open("sc_svtoc", O_WRONLY);
char buf[M];
char* avail;
set_shm();
tS = 0;
int pid, a;
char e[MAX];
while(1)
{
read(ctos, buf, M);
sscanf(buf, "%d %s", &pid, e);
if(strcmp(e, "exit") == 0)
{
removeSvno(pid);
continue;
}
sscanf(buf, "%d %d", &pid, &a);
printf("%d %d\n", pid, a);
avail = shmptr;
int sn = getSvno(pid);
if(sn >= 0)
{
write(stosv[sn], buf, M);
}
else
{
strcpy(buf, "No service available");
write(svtoc, buf, M);
kill(pid, SIGUSR1);
}
}
return 0;
}
int main(int argc,char *argv[])
{
int rate;
if(argv[1] != NULL) rate = atoi(argv[1]);
else rate = 3;
buff_key = 101;
buff_num = 3;
cget_key = 103;
cget_num = 1;
shm_flg = IPC_CREAT | 0644;
buff_ptr = (char *)set_shm(buff_key,buff_num,shm_flg);
cget_ptr = (int *)set_shm(cget_key,cget_num,shm_flg);
prod_key = 201;
cmtx_key = 203;
c_PG_key = 301;
c_TP_key = 302;
c_TG_key = 303;
sem_flg = IPC_CREAT | 0644;
sem_val = 1;
prod_sem = set_sem(prod_key,sem_val,sem_flg);
sem_val = 0;
c_PG_sem = set_sem(c_PG_key,sem_val,sem_flg);
c_TP_sem = set_sem(c_TP_key,sem_val,sem_flg);
c_TG_sem = set_sem(c_TG_key,sem_val,sem_flg);
sem_val = 1;
cmtx_sem = set_sem(cmtx_key,sem_val,sem_flg);
int pid1, pid2;
pid1 = fork();
if(pid1 == 0) {
while(1){
down(c_PG_sem);
down(cmtx_sem);
sleep(rate);
printf("%dsmoker has tobacco T, receive paper %c and glue %c, smoking……\n",
getpid(),buff_ptr[*cget_ptr + 1],buff_ptr[*cget_ptr + 2]);
up(cmtx_sem);
up(prod_sem);
}
} else {
pid2 = fork();
if(pid2 == 0) {
while(1){
down(c_TP_sem);
down(cmtx_sem);
sleep(rate);
printf("%d smoker has glue G,receive paper %c and tobacco %c, smoking……\n",
getpid(),buff_ptr[*cget_ptr + 1],buff_ptr[*cget_ptr]);
up(cmtx_sem);
up(prod_sem);
}
} else {
while(1){
down(c_TG_sem);
down(cmtx_sem);
sleep(rate);
printf("%d smoker has paper P, receive glue %c and tobacco %c, smoking…\n",
getpid(),buff_ptr[*cget_ptr + 2],buff_ptr[*cget_ptr]);
up(cmtx_sem);
up(prod_sem);
}
}
}
return EXIT_SUCCESS;
}
int main(){
int shmd, semd, fd, SHM_KEY, SEM_KEY;
SHM_KEY = ftok("makefile", 1);
SEM_KEY = ftok("makefile", 2);
shmd = shmget(SHM_KEY, sizeof(int), 0644);
semd = semget(SEM_KEY, 1, 0644);
//frankly, I don't know if the semaphore is serving / could potentially serve any purpose based on the way I wrote this
//really should get around to testing that
if(!down(semd)){
//get size of last line
int size = get_shm(shmd);
char buffer[size+1];
printf("==================\n\n");//
printf("size of buffer: %lu bytes\n\n",sizeof(buffer));
printf("buffer at creation: ");//
print(buffer,size);//
buffer[size] = '\0';
printf("buffer after terminating null added: ");//
print(buffer,size);//
//display the last line added to the file
int i;
fd = open("story.txt", O_RDWR);
i = fd;//
printf("open returns %d\n",i);//
i = lseek(fd, (-1)*size, SEEK_END);//
printf("lseek returns %d\n",i);//
i = read(fd, buffer, size);//keep this one
printf("read returns %d\n",i);//
printf("buffer after attempting to read: ");//
print(buffer,size);//
if(i == -1){
printf("read error: %s\n", strerror(errno));
}else{
printf("==================\n");//
printf("The story so far:\n");
printf("%s ...\n\n", buffer);
//printf("Cannot figure out why the above won't print out as a char array. In any case, running \"./control --remove\" will correctly print out all the contents of the file. But this is kind of driving me crazy.\n\n");
//prompt the user to add another line (max 256 characters)
printf("Add a new line (max 256 characters): ");
char new_line[256];
fgets(new_line, sizeof(new_line), stdin);
new_line[strlen(new_line) - 1] = ' ';
new_line[strlen(new_line)] = '\0';
size = strlen(new_line);
/* printf("new size (including space character): %d\n", size); */
//append the new line to the file
lseek(fd, 0, SEEK_END); //shouldn't be necessary, but read() isn't working up above so this is necessary
write(fd, new_line, size);
}
close(fd);
//update shared memory
set_shm(shmd, size);
/* print_shm(shmd); */
//release the semaphore
up(semd);
return 0;
}else{
printf("semaphore error: %s (make sure you've already run \"./control --create\")\n", strerror(errno));
return -1;
}
}
