void session_terminate(session_t *session)
{
union Key k = { .u64 = session->id };
qlock(&session_map_mutex);
mapremove(&session_map, k);
session->status = SESSION_TERMINATED;
qunlock(&session_map_mutex);
}
void session_pause(session_t *session, bool pause)
{
session->status = SESSION_PAUSED;
}
void session_remove_ref(session_t *session)
{
if (session == NULL) {
return;
}
session_lock(session);
session->refcount--;
if (session->refcount == 0 && session->status == SESSION_TERMINATED) {
if (session->data_cleanup != NULL) {
session->data_cleanup(session);
}
free(session);
if (chattyv2g) fprintf(stderr, "Succesfully freed session\n");
// No need to unlock if refcount 0, since it can never increase from this point since it has been removed from the map.
} else if (session->refcount < 0) {
if (chattyv2g) fprintf(stderr, "session_remove_ref: Negative session ref-count. THIS IS BAD!\n");
} else {
session_unlock(session);
}
}
session_t *session_lookup(uint64_t sessionid)
{
if (sessionid == 0) {
return NULL;
}
union Key k = {.u64 = sessionid};
qlock(&session_map_mutex);
session_t **sessionpp = (session_t**)mapfind(&session_map, k);
if (sessionpp == NULL) {
printf("session_lookup: invalid session\n");
return NULL;
}
session_lock(*sessionpp);
(*sessionpp)->refcount++;
if ((*sessionpp)->refcount > 4) {
printf("session_lookup: %d references to the same session, code error is likely\n", (*sessionpp)->refcount);
}
session_unlock(*sessionpp);
qunlock(&session_map_mutex);
return *sessionpp;
}
/* This returns vnode with ioref */
static vnode_t
cttyvp(proc_t p)
{
vnode_t vp;
int vid;
struct session *sessp;
sessp = proc_session(p);
session_lock(sessp);
vp = (p->p_flag & P_CONTROLT ? sessp->s_ttyvp : NULLVP);
vid = sessp->s_ttyvid;
session_unlock(sessp);
session_rele(sessp);
if (vp != NULLVP) {
/* cannot get an IO reference, return NULLVP */
if (vnode_getwithvid(vp, vid) != 0)
vp = NULLVP;
}
return(vp);
}
// session->mutex must be locked
static int wait_for_playlist_loaded(php_spotify_playlist *playlist) {
struct timespec ts;
int err = 0;
php_spotify_session *session;
assert(playlist != NULL);
session = playlist->session;
DEBUG_PRINT("wait_for_playlist_loaded start\n");
// Block for a max of SPOTIFY_TIMEOUT seconds
clock_gettime(CLOCK_REALTIME, &ts);
ts.tv_sec += SPOTIFY_TIMEOUT;
request_lock();
while(err == 0) {
DEBUG_PRINT("wait_for_playlist_loaded loop\n");
int loaded;
session_lock(session);
loaded = sp_playlist_is_loaded(playlist->playlist);
session_unlock(session);
if (loaded)
break;
// Wait until a callback is fired
err = request_sleep_lock(&ts);
}
request_unlock();
DEBUG_PRINT("wait_for_playlist_loaded end(%d)\n", err);
return err;
}
/*
* Device close routine
*/
int
spec_close(struct vnop_close_args *ap)
{
struct vnode *vp = ap->a_vp;
dev_t dev = vp->v_rdev;
int (*devclose)(dev_t, int, int, struct proc *);
int mode, error;
int flags = ap->a_fflag;
struct proc *p = vfs_context_proc(ap->a_context);
struct session *sessp;
switch (vp->v_type) {
case VCHR:
/*
* Hack: a tty device that is a controlling terminal
* has a reference from the session structure.
* We cannot easily tell that a character device is
* a controlling terminal, unless it is the closing
* process' controlling terminal. In that case,
* if the reference count is 1 (this is the very
* last close)
*/
sessp = proc_session(p);
if (sessp != SESSION_NULL) {
if ((vcount(vp) == 1) &&
(vp == sessp->s_ttyvp)) {
session_lock(sessp);
sessp->s_ttyvp = NULL;
sessp->s_ttyvid = 0;
sessp->s_ttyp = TTY_NULL;
sessp->s_ttypgrpid = NO_PID;
session_unlock(sessp);
vnode_rele(vp);
}
session_rele(sessp);
}
devclose = cdevsw[major(dev)].d_close;
mode = S_IFCHR;
/*
* close on last reference or on vnode revoke call
*/
if ((flags & IO_REVOKE) != 0)
break;
if (vcount(vp) > 0)
return (0);
break;
case VBLK:
/*
* Since every use (buffer, vnode, swap, blockmap)
* holds a reference to the vnode, and because we mark
* any other vnodes that alias this device, when the
* sum of the reference counts on all the aliased
* vnodes descends to zero, we are on last close.
*/
if (vcount(vp) > 0)
return (0);
/*
* On last close of a block device (that isn't mounted)
* we must invalidate any in core blocks, so that
* we can, for instance, change floppy disks.
*/
if ((error = spec_fsync_internal(vp, MNT_WAIT, ap->a_context)))
return (error);
error = buf_invalidateblks(vp, BUF_WRITE_DATA, 0, 0);
if (error)
return (error);
devclose = bdevsw[major(dev)].d_close;
mode = S_IFBLK;
break;
default:
panic("spec_close: not special");
return(EBADF);
}
return ((*devclose)(dev, flags, mode, p));
}
int
cttyopen(dev_t dev, int flag, __unused int mode, proc_t p)
{
vnode_t ttyvp = cttyvp(p);
struct vfs_context context;
int error = 0;
int cttyflag, doclose = 0;
struct session *sessp;
if (ttyvp == NULL)
return (ENXIO);
context.vc_thread = current_thread();
context.vc_ucred = kauth_cred_proc_ref(p);
sessp = proc_session(p);
session_lock(sessp);
cttyflag = sessp->s_flags & S_CTTYREF;
session_unlock(sessp);
/*
* A little hack--this device, used by many processes,
* happens to do an open on another device, which can
* cause unhappiness if the second-level open blocks indefinitely
* (as could be the case if the master side has hung up). Since
* we know that this driver doesn't care about the serializing
* opens and closes, we can drop the lock. To avoid opencount leak,
* open the vnode only for the first time.
*/
if (cttyflag == 0) {
devsw_unlock(dev, S_IFCHR);
error = VNOP_OPEN(ttyvp, flag, &context);
devsw_lock(dev, S_IFCHR);
if (error)
goto out;
/*
* If S_CTTYREF is set, some other thread did an open
* and was able to set the flag, now perform a close, else
* set the flag.
*/
session_lock(sessp);
if (cttyflag == (sessp->s_flags & S_CTTYREF))
sessp->s_flags |= S_CTTYREF;
else
doclose = 1;
session_unlock(sessp);
/*
* We have to take a reference here to make sure a close
* gets called during revoke. Note that once a controlling
* tty gets opened by this driver, the only way close will
* get called is when the session leader , whose controlling
* tty is ttyvp, exits and vnode is revoked. We cannot
* redirect close from this driver because underlying controlling
* terminal might change and close may get redirected to a
* wrong vnode causing panic.
*/
if (doclose) {
devsw_unlock(dev, S_IFCHR);
VNOP_CLOSE(ttyvp, flag, &context);
devsw_lock(dev, S_IFCHR);
} else {
error = vnode_ref(ttyvp);
}
}
out:
session_rele(sessp);
vnode_put(ttyvp);
kauth_cred_unref(&context.vc_ucred);
return (error);
}