Blame inotify_handler.c

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/*
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 *  inotify_handler.c - inotify Handler for New Devices
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 *
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 *  Watches /dev/input for new input layer device files.
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 *
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 *  Copyright (C) 2009, Ted Felix (www.tedfelix.com)
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 *
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 *  This program is free software; you can redistribute it and/or modify
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 *  it under the terms of the GNU General Public License as published by
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 *  the Free Software Foundation; either version 2 of the License, or
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 *  (at your option) any later version.
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 *
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 *  This program is distributed in the hope that it will be useful,
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 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
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 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 *  GNU General Public License for more details.
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 *
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 *  You should have received a copy of the GNU General Public License
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 *  along with this program; if not, write to the Free Software
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 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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 *
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 *  (tabs at 4)
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 */
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/* system */
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#include <sys/inotify.h>
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#include <sys/select.h>
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#include <sys/ioctl.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <errno.h>
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#include <string.h>
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#include <limits.h>
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/* local */
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#include "acpid.h"
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#include "log.h"
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#include "connection_list.h"
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#include "input_layer.h"
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#include "inotify_handler.h"
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/*-----------------------------------------------------------------*/
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/* called when an inotify event is received */
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static void process_inotify(int fd)
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{
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	int bytes;
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	int processed_bytes = 0;
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	char eventbuf[sizeof(struct inotify_event) + NAME_MAX + 1];
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	bytes = read(fd, &eventbuf, sizeof(eventbuf));
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	acpid_log(LOG_DEBUG, "inotify read bytes: %d", bytes);
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	/* eof is not expected */	
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	if (bytes == 0) {
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		acpid_log(LOG_WARNING, "inotify fd eof encountered");
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		return;
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	}
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	else if (bytes < 0) {
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		/* EINVAL means buffer wasn't big enough.  See inotify(7). */
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		acpid_log(LOG_ERR, "inotify read error: %s (%d)",
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			strerror(errno), errno);
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		acpid_log(LOG_ERR, "disconnecting from inotify");
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		delete_connection(fd);
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		return;
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	}
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	const int dnsize = NAME_MAX + 1;
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	char devname[dnsize];
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	/* while there are still messages in eventbuf */
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	while (processed_bytes < bytes) {
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		struct inotify_event* curevent = (struct inotify_event *)
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			&eventbuf[processed_bytes];
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		acpid_log(LOG_DEBUG, "inotify name len: %d", curevent->len);
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		/* if a name is included */
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		if (curevent->len > 0) {
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			/* devname = ACPID_INPUTLAYERDIR + "/" + pevent -> name */
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			strcpy(devname, ACPID_INPUTLAYERDIR);
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			strcat(devname, "/");
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			strncat(devname, curevent->name, dnsize - strlen(devname) - 1);
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		}
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		/* if this is a create */
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		if (curevent->mask & IN_CREATE) {
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			acpid_log(LOG_DEBUG, "inotify about to open: %s", devname);
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			open_inputfile(devname);
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		}
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		/* if this is a delete */
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		if (curevent->mask & IN_DELETE) {
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			/* struct connection *c; */
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			acpid_log(LOG_DEBUG, "inotify received a delete for: %s", devname);
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#if 0
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/* Switching back to the original ENODEV detection scheme.  See
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   process_input() in input_layer.c. */
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/* keeping this for future reference */
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			/* search for the event file in the connection list */
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			/* ??? Or should we just have a delete_connection_name()? */
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			c = find_connection_name(devname);
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			/* close that connection if found */
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			if (c)
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				delete_connection(c->fd);
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#endif
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		}
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		processed_bytes += sizeof(struct inotify_event) + curevent->len;
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	}
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}
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/*-----------------------------------------------------------------*/
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/* Set up an inotify watch on /dev/input. */
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void open_inotify(void)
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{
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	int fd = -1;
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	int wd = -1;
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	struct connection c;
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	/* set up inotify */
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	fd = inotify_init1(IN_CLOEXEC);
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	if (fd < 0) {
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		acpid_log(LOG_ERR, "inotify_init() failed: %s (%d)",
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			strerror(errno), errno);
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		return;
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	}
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	acpid_log(LOG_DEBUG, "inotify fd: %d", fd);
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	/* watch for files being created or deleted in /dev/input */
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	wd = inotify_add_watch(fd, ACPID_INPUTLAYERDIR, IN_CREATE | IN_DELETE);
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	if (wd < 0) {
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		if (errno == ENOENT) {
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			/* Common with headless devices. */
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			acpid_log(LOG_WARNING, "inotify_add_watch(): input layer not found");
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		} else {
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			acpid_log(LOG_ERR, "inotify_add_watch() failed: %s (%d)",
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				strerror(errno), errno);
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		}
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		close(fd);			
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		return;
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	}
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	acpid_log(LOG_DEBUG, "inotify wd: %d", wd);
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	/* add a connection to the list */
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	c.fd = fd;
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	c.process = process_inotify;
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	c.pathname = NULL;
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	c.kybd = 0;
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	if (add_connection(&c) < 0) {
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		close(fd);
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		acpid_log(LOG_ERR, "can't add connection for inotify");
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		return;
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	}
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}
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