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efl/src/lib/eio/eio_monitor_kevent.c

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/* EIO - EFL data type library
* Copyright (C) 2011 Enlightenment Developers:
* Cedric Bail <cedric.bail@free.fr>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library;
* if not, see <http://www.gnu.org/licenses/>.
*/
#include "eio_private.h"
#include "Eio.h"
#include "Eina.h"
#include "Ecore_File.h"
#include <sys/types.h>
#include <sys/event.h>
#include <sys/stat.h>
/*============================================================================*
* Local *
*============================================================================*/
/**
* @cond LOCAL
*/
#define KEVENT_NUM_EVENTS 5
struct _Eio_Monitor_Backend
{
Eio_Monitor *parent;
Eina_List *prev_list;
int fd;
};
typedef struct _Eio_File_Info Eio_File_Info;
struct _Eio_File_Info
{
const char *path;
Eina_Stat st;
};
static Ecore_Fd_Handler *_kqueue_fd = NULL;
static Eina_Hash *_kevent_monitors = NULL;
static void
_eio_kevent_ls_free(Eina_List *list)
{
Eio_File_Info *file;
EINA_LIST_FREE(list, file)
{
eina_stringshare_del(file->path);
free(file);
}
}
static void
_eio_kevent_del(void *data)
{
Eio_Monitor_Backend *emb = data;
_eio_kevent_ls_free(emb->prev_list);
if (emb->fd)
close(emb->fd);
free(emb);
}
static Eina_List *
_eio_kevent_ls(const char *directory)
{
Eina_Iterator *it;
Eina_File_Direct_Info *info;
Eina_List *files = NULL;
it = eina_file_direct_ls(directory);
if (!it) return NULL;
EINA_ITERATOR_FOREACH(it, info)
{
Eio_File_Info *file = malloc(sizeof(Eio_File_Info));
if (eina_file_statat(eina_iterator_container_get(it), info, &file->st))
{
free(file);
continue;
}
file->path = eina_stringshare_add(info->path);
files = eina_list_append(files, file);
}
eina_iterator_free(it);
return files;
}
static void
_eio_kevent_event_find(Eio_Monitor_Backend *backend)
{
Eina_List *l, *l2;
Eio_File_Info *file, *file2;
Eina_List *next_list = _eio_kevent_ls(backend->parent->path);
EINA_LIST_FOREACH(backend->prev_list, l, file)
{
Eina_Bool exists = EINA_FALSE;
EINA_LIST_FOREACH(next_list, l2, file2)
{
if (file->st.ino == file2->st.ino)
{
if (file->path == file2->path)
exists = EINA_TRUE;
if (file->st.mtime != file2->st.mtime)
{
if (S_ISDIR(file->st.mode))
_eio_monitor_send(backend->parent, file->path, EIO_MONITOR_DIRECTORY_MODIFIED);
else
_eio_monitor_send(backend->parent, file->path, EIO_MONITOR_FILE_MODIFIED);
}
}
}
if (!exists)
{
if (S_ISDIR(file->st.mode))
_eio_monitor_send(backend->parent, file->path, EIO_MONITOR_DIRECTORY_DELETED);
else
_eio_monitor_send(backend->parent, file->path, EIO_MONITOR_FILE_DELETED);
}
}
EINA_LIST_FOREACH(next_list, l, file)
{
Eina_Bool exists = EINA_FALSE;
EINA_LIST_FOREACH(backend->prev_list, l2, file2)
{
if ((file->path == file2->path) &&
(file->st.ino == file2->st.ino))
{
exists = EINA_TRUE;
break;
}
}
if (!exists)
{
if (S_ISDIR(file->st.mode))
_eio_monitor_send(backend->parent, file->path, EIO_MONITOR_DIRECTORY_CREATED);
else
_eio_monitor_send(backend->parent, file->path, EIO_MONITOR_FILE_CREATED);
}
}
_eio_kevent_ls_free(backend->prev_list);
backend->prev_list = next_list;
}
static Eina_Bool
_eio_kevent_handler(void *data EINA_UNUSED, Ecore_Fd_Handler *fdh)
{
Eio_Monitor_Backend *backend;
struct kevent evs[KEVENT_NUM_EVENTS];
int event_code = 0;
const struct timespec timeout = { 0, 0 };
int res = kevent(ecore_main_fd_handler_fd_get(fdh), 0, 0, evs, KEVENT_NUM_EVENTS, &timeout);
for(int i=0; i<res; ++i)
{
backend = eina_hash_find(_kevent_monitors, &evs[i].ident);
if(evs[i].fflags & NOTE_DELETE)
{
event_code = EIO_MONITOR_SELF_DELETED;
_eio_monitor_send(backend->parent, backend->parent->path, event_code);
}
if(evs[i].fflags & NOTE_WRITE || evs[i].fflags & NOTE_ATTRIB)
{
/* Handle directory/file creation and deletion */
if (ecore_file_is_dir(backend->parent->path))
_eio_kevent_event_find(backend);
else
{
event_code = EIO_MONITOR_FILE_MODIFIED;
_eio_monitor_send(backend->parent, backend->parent->path, event_code);
}
}
}
return ECORE_CALLBACK_RENEW;
}
/**
* @endcond
*/
/*============================================================================*
* Global *
*============================================================================*/
/**
* @cond LOCAL
*/
/**
* @endcond
*/
void eio_monitor_backend_init(void)
{
int fd;
if (_kqueue_fd != NULL) return; // already initialized
fd = kqueue();
if (fd < 0) return;
_kqueue_fd = ecore_main_fd_handler_add(fd, ECORE_FD_READ, _eio_kevent_handler, NULL, NULL, NULL);
if (!_kqueue_fd)
{
close(fd);
return;
}
_kevent_monitors = eina_hash_int32_new(_eio_kevent_del);
}
void eio_monitor_backend_shutdown(void)
{
int fd;
if (!_kqueue_fd) return;
eina_hash_free(_kevent_monitors);
fd = ecore_main_fd_handler_fd_get(_kqueue_fd);
ecore_main_fd_handler_del(_kqueue_fd);
_kqueue_fd = NULL;
if (fd < 0)
return;
close(fd);
}
void eio_monitor_backend_add(Eio_Monitor *monitor)
{
struct kevent e;
struct stat st;
Eio_Monitor_Backend* backend;
int fd, res = 0;
if (!_kqueue_fd)
{
return;
}
backend = calloc(1, sizeof (Eio_Monitor_Backend));
if (!backend) return;
res = stat(monitor->path, &st);
if (res) goto error;
fd = open(monitor->path, O_RDONLY);
if (fd < 0) goto error;
eina_file_close_on_exec(fd, EINA_TRUE);
backend->fd = fd;
backend->parent = monitor;
monitor->backend = backend;
if (ecore_file_is_dir(backend->parent->path))
backend->prev_list = _eio_kevent_ls(backend->parent->path);
eina_hash_direct_add(_kevent_monitors, &backend->fd, backend);
EV_SET(&e, fd, EVFILT_VNODE, EV_ADD | EV_CLEAR,
NOTE_DELETE | NOTE_WRITE | NOTE_ATTRIB, 0, NULL);
res = kevent(ecore_main_fd_handler_fd_get(_kqueue_fd), &e, 1, 0, 0, 0);
if (res)
{
eina_hash_del(_kevent_monitors, &backend->fd, backend);
}
return;
error:
free(backend);
}
void eio_monitor_backend_del(Eio_Monitor *monitor)
{
Eio_Monitor_Backend *backend;
backend = monitor->backend;
monitor->backend = NULL;
eina_hash_del(_kevent_monitors, &backend->fd, backend);
}
Eina_Bool eio_monitor_context_check(const Eio_Monitor *monitor, const char *path)
{
Eio_Monitor_Backend *backend = monitor->backend;
Eina_List *l;
Eio_File_Info *file;
EINA_LIST_FOREACH(backend->prev_list, l, file)
{
if (eina_streq(file->path, path))
{
return EINA_TRUE;
}
}
return EINA_FALSE;
}
/*============================================================================*
* API *
*============================================================================*/
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