see the attachment
-- Marcel Lanz <marcel.lanz@ds9.ch>PGP-Key fingerprint = 71 BE AC 43 04 53 F9 2D 4F B7 B1 47 E5 9B 91 72 --------------4C17A0956DDD8B23A336DB20 Content-Type: text/plain; charset=us-ascii; name="pseudo" Content-Transfer-Encoding: 7bit Content-Disposition: inline; filename="pseudo"
-------------- syscall dkmctl ------- #define DKM_MAP_REQ 1 #define DKM_CSD_REG 2 #define DKM_CSD_DEREG 3 #define DKM_DOSIG 4 #define DKM_MAP_RESP 5
pid_t dkm_csd_pid; /*spinlock_t dkm_map_lock = SPIN_LOCK_UNLOCKED;*/
struct semaphore dkm_map_sema = MUTEX; dkm_csd_pid = -1;
asmlinkage int sys_dkmctl(int cmd, void *arg, void *resp) { char* node_name; node_name = (char*) kmalloc(64, GFP_KERNEL); switch(cmd) { case DKM_MAP_REQ: /*spin_lock_irqsave(&dkm_map_lock, flags);*/ down(&dkm_map_sema); copy_to_user((char*)arg, "filename", 9); break; case DKM_MAP_RESP: strncpy_from_user(node_name, arg, strlen_user(arg)); printk("node to name is: %s\n", node_name); /*spin_unlock_irq(&dkm_map_lock);*/ up(&dkm_map_sema); break; case DKM_CSD_REG: dkm_csd_pid = *(int*)arg; break; case DKM_CSD_DEREG: dkm_csd_pid = -1; break; case DKM_DOSIG: if(dkm_csd_pid > 0) force_sig(SIGUSR2, find_task_by_pid(dkm_csd_pid)); break; default: break; } /* switch */
printk("csd_pid is: %d, current->pid is: %d\n", dkm_csd_pid, current->pid); kfree(node_name);
return 0; }
------------------------------ signal-handler:
void on_sigusr2(int signal) { char* node_name; char* buff;
node_name = (char*) malloc(64); buff = (char*) malloc(64);
printf("sigusr2 from kernel reveived\n"); dkmctl(DKM_MAP_REQ, buff, NULL); printf("buff is: %s\n", buff); strcpy(node_name, "orinoco"); dkmctl(DKM_MAP_RESP, node_name);
free(node_name); free(buff); }
--------------4C17A0956DDD8B23A336DB20--
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