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/*
* Copyright (c) International Business Machines Corp., 2014
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* File: watch.c
* Author: Shaun Wetzstein <shaun@us.ibm.com>
* Descr:
* Note:
* Date: 10/03/10
*/
#include <unistd.h>
#include <stdarg.h>
#include <stdlib.h>
#include <malloc.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <limits.h>
#include "misc.h"
#include "nargs.h"
#include "watch.h"
#define WATCH_PAGE_SIZE 64
#define WATCH_EVENT_SIZE 64
/* ======================================================================= */
const char *__watch_msg[] = {
"watch: unexpected NULL self pointer",
"watch: unexpected NULL callback structure",
};
#define WATCH_NULL (__watch_msg[0])
#define WATCH_CALLBACK_NULL (__watch_msg[1])
/* ======================================================================= */
void watch_init(watch_t * self)
{
if (unlikely(self == NULL))
throw_unexpected(WATCH_NULL);
if (self->fd != -1)
close(self->fd), self->fd = -1;
self->fd = inotify_init1(IN_CLOEXEC);
if (unlikely(self->fd == -1))
throw_errno(errno);
array_init(&self->callbacks, sizeof(watch_callback_t), WATCH_PAGE_SIZE);
}
void watch_delete(watch_t * self)
{
if (unlikely(self == NULL))
throw_unexpected(WATCH_NULL);
close(self->fd), self->fd = -1;
array_delete(&self->callbacks);
}
int watch_fileno(watch_t * self)
{
if (unlikely(self == NULL))
throw_unexpected(WATCH_NULL);
return self->fd;
}
uint32_t watch_add(watch_t * self, const char *path, uint32_t events,
watch_callback_t * cb)
{
if (unlikely(self == NULL))
throw_unexpected(WATCH_NULL);
if (access(path, F_OK) != 0)
throw_errno(errno);
uint32_t wd = inotify_add_watch(self->fd, path, events);
if (unlikely((int)wd == -1))
throw_errno(errno);
if (cb != NULL)
array_put(&self->callbacks, wd, cb, 1);
return wd;
}
void watch_remove(watch_t * self, uint32_t wd)
{
if (unlikely(self == NULL))
throw_unexpected(WATCH_NULL);
int rc = inotify_rm_watch(self->fd, wd);
if (unlikely(rc == -1))
throw_errno(errno);
array_status(&self->callbacks, wd, false);
}
void watch_wait(watch_t * self)
{
if (unlikely(self == NULL))
throw_unexpected(WATCH_NULL);
/* FIX ME */
watch_event_t events[WATCH_EVENT_SIZE];
ssize_t n = read(self->fd, events, sizeof events);
printf("n[%d]\n", n);
for (ssize_t i = 0; i < (ssize_t) (n / sizeof *events); i++)
printf("%d: wd[%d] mask[%x] cookie[%x] name[%.*s]\n",
i, events[i].wd, events[i].mask, events[i].cookie,
events[i].len, events[i].name);
}
/* ======================================================================= */
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