/*
* inotify_handler.c - inotify Handler for New Devices
*
* Watches /dev/input for new input layer device files.
*
* Copyright (C) 2009, Ted Felix (www.tedfelix.com)
*
* 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
*
* (tabs at 4)
*/
/* system */
#include <sys/inotify.h>
#include <sys/select.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <limits.h>
/* local */
#include "acpid.h"
#include "log.h"
#include "connection_list.h"
#include "input_layer.h"
#include "inotify_handler.h"
/*-----------------------------------------------------------------*/
/* called when an inotify event is received */
static void process_inotify(int fd)
{
int bytes;
int processed_bytes = 0;
char eventbuf[sizeof(struct inotify_event) + NAME_MAX + 1];
bytes = read(fd, &eventbuf, sizeof(eventbuf));
acpid_log(LOG_DEBUG, "inotify read bytes: %d", bytes);
/* eof is not expected */
if (bytes == 0) {
acpid_log(LOG_WARNING, "inotify fd eof encountered");
return;
}
else if (bytes < 0) {
/* EINVAL means buffer wasn't big enough. See inotify(7). */
acpid_log(LOG_ERR, "inotify read error: %s (%d)",
strerror(errno), errno);
acpid_log(LOG_ERR, "disconnecting from inotify");
delete_connection(fd);
return;
}
const int dnsize = NAME_MAX + 1;
char devname[dnsize];
/* while there are still messages in eventbuf */
while (processed_bytes < bytes) {
struct inotify_event* curevent = (struct inotify_event *)
&eventbuf[processed_bytes];
acpid_log(LOG_DEBUG, "inotify name len: %d", curevent->len);
/* if a name is included */
if (curevent->len > 0) {
/* devname = ACPID_INPUTLAYERDIR + "/" + pevent -> name */
strcpy(devname, ACPID_INPUTLAYERDIR);
strcat(devname, "/");
strncat(devname, curevent->name, dnsize - strlen(devname) - 1);
}
/* if this is a create */
if (curevent->mask & IN_CREATE) {
acpid_log(LOG_DEBUG, "inotify about to open: %s", devname);
open_inputfile(devname);
}
/* if this is a delete */
if (curevent->mask & IN_DELETE) {
/* struct connection *c; */
acpid_log(LOG_DEBUG, "inotify received a delete for: %s", devname);
#if 0
/* Switching back to the original ENODEV detection scheme. See
process_input() in input_layer.c. */
/* keeping this for future reference */
/* search for the event file in the connection list */
/* ??? Or should we just have a delete_connection_name()? */
c = find_connection_name(devname);
/* close that connection if found */
if (c)
delete_connection(c->fd);
#endif
}
processed_bytes += sizeof(struct inotify_event) + curevent->len;
}
}
/*-----------------------------------------------------------------*/
/* Set up an inotify watch on /dev/input. */
void open_inotify(void)
{
int fd = -1;
int wd = -1;
struct connection c;
/* set up inotify */
fd = inotify_init1(IN_CLOEXEC);
if (fd < 0) {
acpid_log(LOG_ERR, "inotify_init() failed: %s (%d)",
strerror(errno), errno);
return;
}
acpid_log(LOG_DEBUG, "inotify fd: %d", fd);
/* watch for files being created or deleted in /dev/input */
wd = inotify_add_watch(fd, ACPID_INPUTLAYERDIR, IN_CREATE | IN_DELETE);
if (wd < 0) {
if (errno == ENOENT) {
/* Common with headless devices. */
acpid_log(LOG_WARNING, "inotify_add_watch(): input layer not found");
} else {
acpid_log(LOG_ERR, "inotify_add_watch() failed: %s (%d)",
strerror(errno), errno);
}
close(fd);
return;
}
acpid_log(LOG_DEBUG, "inotify wd: %d", wd);
/* add a connection to the list */
c.fd = fd;
c.process = process_inotify;
c.pathname = NULL;
c.kybd = 0;
if (add_connection(&c) < 0) {
close(fd);
acpid_log(LOG_ERR, "can't add connection for inotify");
return;
}
}