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/*
* Musicfs is a FUSE module implementing a media filesystem in userland.
* Copyright (C) 2009 Ulf Lilleengen, Kjetil Ørbekk
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* A copy of the license can typically be found in COPYING
*/
#if defined(__FreeBSD__)
#include <sys/types.h>
#include <sys/param.h>
#include <sys/event.h>
#include <sys/time.h>
#endif
#include <fcntl.h>
#include <pthread.h>
/*#include <fusever.h>*/
#include <assert.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <mfs_notify.h>
/*
* One entry for the file that should be handled.
*/
struct mfs_notify_entry {
int fd;
char path[MAXPATHLEN + 1];
LIST_ENTRY(mfs_notify_entry) next;
};
/*
* Data structure to keep track of all files and directories we want to keep
* track of.
*/
struct mfs_notify_list {
LIST_HEAD(, mfs_notify_entry) nl_head;
pthread_mutex_t nl_lock;
#define MFS_NOTIFYLIST_LOCK(l) pthread_mutex_lock(&(l)->nl_lock)
#define MFS_NOTIFYLIST_UNLOCK(l) pthread_mutex_unlock(&(l)->nl_lock)
#if defined(__FreeBSD__)
int kqueue_fd;
#endif
mfs_callback_fn_t *handler;
};
/* XXX: We use a global list for now. */
struct mfs_notify_list nl;
#if defined(__FreeBSD__)
pthread_t mfs_notify_kqueue_thr;
static void *mfs_notify_kqueue_handler(void *);
#endif
/* Initialize the notification system. */
int
mfs_notify_init(mfs_callback_fn_t *fn)
{
assert(fn != NULL);
LIST_INIT(&nl.nl_head);
pthread_mutex_init(&nl.nl_lock, NULL);
nl.handler = fn;
#if defined(__FreeBSD__)
nl.kqueue_fd = kqueue();
#endif
return (0);
}
/* Register a file for events. */
int
mfs_notify_register(const char *path)
{
struct mfs_notify_entry *ent;
assert(path != NULL);
ent = malloc(sizeof(struct mfs_notify_entry));
if (ent == NULL)
return (-1);
strlcpy(ent->path, path, sizeof(ent->path));
ent->fd = open(path, O_RDONLY);
if (ent->fd < 0)
return (-1);
MFS_NOTIFYLIST_LOCK(&nl);
LIST_INSERT_HEAD(&nl.nl_head, ent, next);
MFS_NOTIFYLIST_UNLOCK(&nl);
#if defined(__FreeBSD__)
struct kevent ev;
EV_SET(&ev, ent->fd, EVFILT_VNODE, EV_ADD | EV_ENABLE | EV_CLEAR,
NOTE_RENAME | NOTE_WRITE | NOTE_DELETE, 0, ent);
kevent(nl.kqueue_fd, &ev, 1, NULL, 0, NULL);
pthread_create(&mfs_notify_kqueue_thr, NULL, mfs_notify_kqueue_handler,
&nl);
#endif
return (0);
}
/* Unregister a file for events. */
int
mfs_notify_unregister_file(const char *path)
{
struct mfs_notify_entry *ent;
MFS_NOTIFYLIST_LOCK(&nl);
LIST_FOREACH(ent, &nl.nl_head, next) {
if (strcmp(ent->path, path) == 0) {
LIST_REMOVE(ent, next);
close(ent->fd);
free(ent);
break;
}
}
MFS_NOTIFYLIST_UNLOCK(&nl);
return (0);
}
/* Unregister a file for events using the entry directly. */
int
mfs_notify_unregister_entry(struct mfs_notify_entry *ent)
{
return (mfs_notify_unregister_file(ent->path));
}
/* Return path associated with entry. */
const char *
mfs_notify_path(struct mfs_notify_entry *ent)
{
return (ent->path);
}
#if defined(__FreeBSD__)
static void *
mfs_notify_kqueue_handler(void *arg)
{
struct mfs_notify_list *nlp = (struct mfs_notify_list *)arg;
struct kevent ev;
int n;
assert(nlp != NULL);
for (;;) {
n = kevent(nlp->kqueue_fd, NULL, 0, &ev, 1, NULL);
if (n <= 0)
continue;
struct mfs_notify_entry *ent = ev.udata;
assert(ent != NULL);
struct mfs_notify_event e;
e.ev_type = 0;
/* Convert to system independent flags. */
if (ev.fflags & NOTE_DELETE)
e.ev_type |= EVENT_DELETE;
else if (ev.fflags & NOTE_WRITE)
e.ev_type |= EVENT_WRITE;
else if (ev.fflags & NOTE_EXTEND)
e.ev_type |= EVENT_EXTEND;
else if (ev.fflags & NOTE_ATTRIB)
e.ev_type |= EVENT_ATTRIB;
else if (ev.fflags & NOTE_LINK)
e.ev_type |= EVENT_LINK;
else if (ev.fflags & NOTE_RENAME)
e.ev_type |= EVENT_RENAME;
else if (ev.fflags & NOTE_REVOKE)
e.ev_type |= EVENT_REVOKE;
e.ev_data = ent;
nlp->handler(&e);
}
}
#endif
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