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/* inotify_helper.h - Simple iteration for inotify events
*
* Copyright (C) 2014 Luke Shumaker
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* 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, see <http://www.gnu.org/licenses/>.
*/
/* The usage is pretty simple:
*
* int my_filedesc = inotify_init();
* ...
* struct inotify_event *my_event;
* for (INOTIFY_ITERATOR(my_filedesc, my_event)) {
* ...
* }
*
* Easy, right?
*/
#ifndef _INOTIFY_ITERATOR_H
#define _INOTIFY_ITERATOR_H
#include <sys/inotify.h>
#include <limits.h> /* for NAME_MAX */
#include <string.h> /* for memset(3) */
#include <unistd.h> /* for read(3) */
struct _inotify_buffer {
ssize_t len;
ssize_t pos;
char dat[sizeof(struct inotify_event)+NAME_MAX+1];
};
#define _INOTIFY_ITERATOR_EVENT(BUF) \
((struct inotify_event *)&((BUF).dat[(BUF).pos]))
#define _INOTIFY_ITERATOR_EVENT_SIZE(BUF) \
(sizeof(struct inotify_event) + _INOTIFY_ITERATOR_EVENT(BUF)->len)
#define _INOTIFY_ITERATOR_CHECK(FD, BUF, EVENT) \
BUF.len > -1
#define _INOTIFY_ITERATOR_UPDATE(FD, BUF, EVENT) \
EVENT = ({ \
if (BUF.len-(BUF.pos+_INOTIFY_ITERATOR_EVENT_SIZE(BUF)) < 1) { \
do { \
BUF.len = read(FD, BUF.dat, sizeof(BUF.dat)); \
} while (BUF.len == 0); \
BUF.pos = 0; \
} else { \
BUF.pos += _INOTIFY_ITERATOR_EVENT_SIZE(BUF); \
} \
_INOTIFY_ITERATOR_EVENT(BUF); \
})
#define _INOTIFY_ITERATOR_INIT(FD, BUF, EVENT) \
struct _inotify_buffer BUF = ({ \
struct _inotify_buffer tmp; \
memset(&tmp, 0, sizeof(tmp)); \
do { \
tmp.len = read(FD, tmp.dat, sizeof(tmp.dat)); \
} while (tmp.len == 0); \
EVENT = (struct inotify_event *)&BUF; \
tmp; \
})
#define INOTIFY_ITERATOR(FD, EVENT) \
_INOTIFY_ITERATOR_INIT(FD, _buf, EVENT); \
_INOTIFY_ITERATOR_CHECK(FD, _buf, EVENT); \
_INOTIFY_ITERATOR_UPDATE(FD, _buf, EVENT)
#endif
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