/* Thread: scan */
static void
process_directories(char *root, int flags)
{
char *path;
process_directory(root, flags);
if (scan_exit)
return;
while ((path = pop_dir(&dirstack)))
{
process_directory(path, flags);
free(path);
if (scan_exit)
return;
}
}
static void
process_directories(char *root, int parent_id, int flags)
{
struct stacked_dir *dir;
process_directory(root, parent_id, flags);
if (scan_exit)
return;
while ((dir = pop_dir(&dirstack)))
{
process_directory(dir->path, dir->parent_id, flags);
free(dir->path);
free(dir);
if (scan_exit)
return;
}
}
/* Thread: scan */
static void
kqueue_cb(int fd, short event, void *arg)
{
struct kevent kev;
struct timespec ts;
struct watch_info wi;
struct watch_enum we;
struct stacked_dir *rescan;
struct stacked_dir *d;
struct stacked_dir *dprev;
char *path;
uint32_t wd;
int d_len;
int w_len;
int need_rescan;
int ret;
ts.tv_sec = 0;
ts.tv_nsec = 0;
we.cookie = 0;
rescan = NULL;
DPRINTF(E_DBG, L_SCAN, "Library changed!\n");
/* We can only monitor directories with kqueue; to monitor files, we'd need
* to have an open fd on every file in the library, which is totally insane.
* Unfortunately, that means we only know when directories get renamed,
* deleted or changed. We don't get directory/file names when directories/files
* are created/deleted/renamed in the directory, so we have to rescan.
*/
while (kevent(fd, NULL, 0, &kev, 1, &ts) > 0)
{
/* This should not happen, and if it does, we'll end up in
* an infinite loop.
*/
if (kev.filter != EVFILT_VNODE)
continue;
wi.wd = kev.ident;
ret = db_watch_get_bywd(&wi);
if (ret < 0)
{
DPRINTF(E_LOG, L_SCAN, "Found no matching watch for kevent, killing this event\n");
close(kev.ident);
continue;
}
/* Whatever the type of event that happened, disable matching watches and
* files before we trigger an eventual rescan.
*/
we.match = wi.path;
ret = db_watch_enum_start(&we);
if (ret < 0)
{
free(wi.path);
continue;
}
while ((db_watch_enum_fetchwd(&we, &wd) == 0) && (wd))
{
close(wd);
}
db_watch_enum_end(&we);
db_watch_delete_bymatch(wi.path);
close(wi.wd);
db_watch_delete_bywd(wi.wd);
/* Disable files */
db_file_disable_bymatch(wi.path, "", 0);
db_pl_disable_bymatch(wi.path, "", 0);
if (kev.flags & EV_ERROR)
{
DPRINTF(E_LOG, L_SCAN, "kevent reports EV_ERROR (%s): %s\n", wi.path, strerror(kev.data));
ret = access(wi.path, F_OK);
if (ret != 0)
{
free(wi.path);
continue;
}
/* The directory still exists, so try to add it back to the library */
kev.fflags |= NOTE_WRITE;
}
/* No further action on NOTE_DELETE & NOTE_RENAME; NOTE_WRITE on the
* parent directory will trigger a rescan in both cases and the
* renamed directory will be picked up then.
*/
if (kev.fflags & NOTE_WRITE)
{
DPRINTF(E_DBG, L_SCAN, "Got NOTE_WRITE (%s)\n", wi.path);
need_rescan = 1;
w_len = strlen(wi.path);
/* Abusing stacked_dir a little bit here */
dprev = NULL;
d = rescan;
while (d)
{
d_len = strlen(d->path);
if (d_len > w_len)
{
/* Stacked dir child of watch dir? */
if ((d->path[w_len] == '/') && (strncmp(d->path, wi.path, w_len) == 0))
{
DPRINTF(E_DBG, L_SCAN, "Watched directory is a parent\n");
if (dprev)
dprev->next = d->next;
else
rescan = d->next;
free(d->path);
free(d);
if (dprev)
d = dprev->next;
else
d = rescan;
continue;
}
}
else if (w_len > d_len)
{
/* Watch dir child of stacked dir? */
if ((wi.path[d_len] == '/') && (strncmp(wi.path, d->path, d_len) == 0))
{
DPRINTF(E_DBG, L_SCAN, "Watched directory is a child\n");
need_rescan = 0;
break;
}
}
else if (strcmp(wi.path, d->path) == 0)
{
DPRINTF(E_DBG, L_SCAN, "Watched directory already listed\n");
need_rescan = 0;
break;
}
dprev = d;
d = d->next;
}
if (need_rescan)
push_dir(&rescan, wi.path);
}
free(wi.path);
}
while ((path = pop_dir(&rescan)))
{
process_directories(path, 0);
free(path);
if (rescan)
DPRINTF(E_LOG, L_SCAN, "WARNING: unhandled leftover directories\n");
}
event_add(&inoev, NULL);
}
