/* delete a console */
void
vntsd_delete_cons(vntsd_t *vntsdp)
{
vntsd_group_t *groupp;
vntsd_cons_t *consp;
for (; ; ) {
/* get the group contains deleted console */
(void) mutex_lock(&vntsdp->lock);
groupp = vntsd_que_walk(vntsdp->grouppq,
(el_func_t)find_clean_cons_group);
if (groupp == NULL) {
/* no more group has console deleted */
(void) mutex_unlock(&vntsdp->lock);
return;
}
groupp->status &= ~VNTSD_GROUP_CLEAN_CONS;
(void) mutex_unlock(&vntsdp->lock);
for (; ; ) {
/* get the console to be deleted */
(void) mutex_lock(&groupp->lock);
assert(groupp->conspq);
consp = vntsd_que_walk(groupp->conspq,
(el_func_t)find_clean_cons);
if (consp == NULL) {
/* no more cons to delete */
(void) mutex_unlock(&groupp->lock);
break;
}
/* remove console from the group */
(void) vntsd_que_rm(&groupp->conspq, consp);
groupp->num_cons--;
(void) mutex_unlock(&groupp->lock);
/* clean up the console */
cleanup_cons(consp);
/* delete group? */
if (groupp->num_cons == 0) {
/* no more console delete it */
assert(groupp->vntsd);
(void) mutex_lock(&groupp->vntsd->lock);
(void) vntsd_que_rm(&groupp->vntsd->grouppq,
groupp);
(void) mutex_unlock(&groupp->vntsd->lock);
/* clean up the group */
vntsd_clean_group(groupp);
break;
}
}
}
}
/*
* acquire_writer() the client is going to be writer.
* insert the client to the head of the console client queue.
*/
static int
acquire_writer(vntsd_client_t *clientp)
{
vntsd_cons_t *consp;
vntsd_client_t *writerp;
int rv;
D1(stderr, "t@%d:acuire_writer :client@%d\n", thr_self(),
clientp->sockfd);
assert(clientp != NULL);
consp = clientp->cons;
assert(consp);
(void) mutex_lock(&consp->lock);
assert(consp->clientpq != NULL);
if (consp->clientpq->handle == clientp) {
/* clientp is a writer already */
(void) mutex_unlock(&consp->lock);
return (VNTSD_SUCCESS);
}
/* current writer */
writerp = (vntsd_client_t *)(consp->clientpq->handle);
(void) mutex_lock(&writerp->lock);
rv = vntsd_que_rm(&(consp->clientpq), clientp);
assert(rv == VNTSD_SUCCESS);
(void) mutex_lock(&clientp->lock);
/* move client to be first in the console queue */
consp->clientpq->handle = clientp;
/* move previous writer to be the second in the queue */
rv = vntsd_que_insert_after(consp->clientpq, clientp, writerp);
(void) mutex_unlock(&consp->lock);
(void) mutex_unlock(&writerp->lock);
(void) mutex_unlock(&clientp->lock);
if (rv != VNTSD_SUCCESS) {
return (rv);
}
/* write warning message to the writer */
if ((rv = vntsd_write_line(writerp,
gettext("Warning: Console connection forced into read-only mode")))
!= VNTSD_SUCCESS) {
return (rv);
}
return (VNTSD_SUCCESS);
}
/* clean up a group */
void
vntsd_clean_group(vntsd_group_t *groupp)
{
timestruc_t to;
D1(stderr, "t@%d clean_group() group=%s tcp=%lld\n", thr_self(),
groupp->group_name, groupp->tcp_port);
(void) mutex_lock(&groupp->lock);
/* prevent from reentry */
if (groupp->status & VNTSD_GROUP_CLEANUP) {
(void) mutex_unlock(&groupp->lock);
return;
}
groupp->status |= VNTSD_GROUP_CLEANUP;
vntsd_free_que(&groupp->conspq, (clean_func_t)cleanup_cons);
(void) mutex_unlock(&groupp->lock);
/* walk through no cons client queue */
while (groupp->no_cons_clientpq != NULL) {
groupp->status |= VNTSD_GROUP_SIG_WAIT;
(void) vntsd_que_walk(groupp->no_cons_clientpq,
(el_func_t)vntsd_notify_client_cons_del);
to.tv_sec = VNTSD_CV_WAIT_DELTIME;
to.tv_nsec = 0;
(void) cond_reltimedwait(&groupp->cvp, &groupp->lock, &to);
}
if (groupp->listen_tid == thr_self()) {
/* listen thread is exiting */
(void) mutex_lock(&(groupp->vntsd->lock));
(void) vntsd_que_rm(&groupp->vntsd->grouppq, groupp);
(void) mutex_unlock(&groupp->vntsd->lock);
(void) cond_destroy(&groupp->cvp);
(void) mutex_unlock(&groupp->lock);
(void) mutex_destroy(&groupp->lock);
free(groupp);
return;
}
/* signal listen thread to exit */
groupp->status |= VNTSD_GROUP_SIG_WAIT;
while (groupp->status & VNTSD_GROUP_SIG_WAIT) {
(void) thr_kill(groupp->listen_tid, SIGUSR1);
to.tv_sec = VNTSD_CV_WAIT_DELTIME;
to.tv_nsec = 0;
/* wait listen thread to exit */
(void) cond_reltimedwait(&groupp->cvp, &groupp->lock, &to);
}
(void) mutex_unlock(&groupp->lock);
(void) thr_join(groupp->listen_tid, NULL, NULL);
/* free group */
(void) cond_destroy(&groupp->cvp);
(void) mutex_destroy(&groupp->lock);
free(groupp);
}
/* ceate console selection thread */
static int
create_console_thread(vntsd_group_t *groupp, int sockfd)
{
vntsd_client_t *clientp;
vntsd_thr_arg_t *thr_arg;
int rv;
assert(groupp);
D1(stderr, "t@%d create_console_thread@%lld:client@%d\n", thr_self(),
groupp->tcp_port, sockfd);
/* allocate a new client */
clientp = (vntsd_client_t *)malloc(sizeof (vntsd_client_t));
if (clientp == NULL) {
return (VNTSD_ERR_NO_MEM);
}
/* initialize the client */
bzero(clientp, sizeof (vntsd_client_t));
clientp->sockfd = sockfd;
clientp->cons_tid = (thread_t)-1;
(void) mutex_init(&clientp->lock, USYNC_THREAD|LOCK_ERRORCHECK, NULL);
/* append client to group */
(void) mutex_lock(&groupp->lock);
/* check if the group is [being] removed */
if (groupp->status & VNTSD_GROUP_IN_CLEANUP) {
(void) mutex_unlock(&groupp->lock);
vntsd_free_client(clientp);
return (VNTSD_STATUS_NO_CONS);
}
if ((rv = vntsd_que_append(&groupp->no_cons_clientpq, clientp))
!= VNTSD_SUCCESS) {
(void) mutex_unlock(&groupp->lock);
vntsd_free_client(clientp);
return (rv);
}
(void) mutex_unlock(&groupp->lock);
/*
* allocate thr_arg from heap for console thread so
* that thr_arg is still valid after this function exits.
* console thread will free thr_arg.
*/
thr_arg = (vntsd_thr_arg_t *)malloc(sizeof (vntsd_thr_arg_t));
if (thr_arg == NULL) {
vntsd_free_client(clientp);
return (VNTSD_ERR_NO_MEM);
}
thr_arg->handle = groupp;
thr_arg->arg = clientp;
(void) mutex_lock(&clientp->lock);
/* create console selection thread */
if (thr_create(NULL, 0, (thr_func_t)vntsd_console_thread,
thr_arg, THR_DETACHED, &clientp->cons_tid)) {
free(thr_arg);
(void) mutex_unlock(&clientp->lock);
(void) mutex_lock(&groupp->lock);
(void) vntsd_que_rm(&groupp->no_cons_clientpq, clientp);
(void) mutex_unlock(&groupp->lock);
vntsd_free_client(clientp);
return (VNTSD_ERR_CREATE_CONS_THR);
}
(void) mutex_unlock(&clientp->lock);
return (VNTSD_SUCCESS);
}
