/*
* kacpimon - Kernel ACPI Event Monitor
*
* Monitors kernel ACPI events from multiple interfaces and reports them
* to the console.
*
* Inspired by (and in some cases blatantly lifted from) Vojtech Pavlik's
* evtest.c, Zhang Rui's acpi_genl, and Alexey Kuznetsov's libnetlink.
*
* Copyright (C) 2008, 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 <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/select.h>
#include <string.h>
#include <errno.h>
#include <malloc.h>
/* local */
#include "libnetlink.h"
#include "genetlink.h"
#include "acpi_genetlink.h"
#include "acpi_ids.h"
#include "connection_list.h"
#include "input_layer.h"
#include "netlink.h"
#include "kacpimon.h"
/* ??? Isn't this in a system header someplace? */
#define max(a, b) (((a)>(b))?(a):(b))
/*********************************************************************/
/* Exit flag that can be set by any of the functions to cause the */
/* program to exit. */
int exitflag = 0;
/****************************************************************
* Old /proc/acpi/event interface
****************************************************************/
static void process_proc(int fd)
{
const int buffsize = 1024;
char buffer[buffsize];
ssize_t nbytes;
for (;;)
{
nbytes = read(fd, buffer, buffsize - 1);
/* ??? Do we need to worry about partial messages? */
/* If there are no data to read, bail. */
if (nbytes <= 0)
break;
/* Ensure we have a zero terminator */
buffer[nbytes] = 0;
printf("/proc/acpi/event: %s", buffer);
}
}
// ---------------------------------------------------------------
static void open_proc(void)
{
char *filename = "/proc/acpi/event";
int fd;
struct connection c;
fd = open(filename, O_RDONLY | O_NONBLOCK);
if (fd >= 0)
{
printf("%s opened successfully\n", filename);
/* Add a connection to the list. */
c.fd = fd;
c.process = process_proc;
add_connection(&c);
}
else
{
int errno2 = errno;
printf("open for %s: %s (%d)\n",
filename, strerror(errno2), errno2);
if (errno2 == EACCES)
printf(" (try running as root)\n");
if (errno2 == ENOENT)
printf(" (ACPI proc filesystem may not be present)\n");
if (errno2 == EBUSY)
printf(" (ACPI proc filesystem is in use. "
"You might need to kill acpid.)\n");
}
}
/****************************************************************
* Main Program Functions
****************************************************************/
static void monitor(void)
{
while (exitflag == 0)
{
fd_set readfds;
int nready;
int i;
/* It's going to get clobbered, so use a copy. */
readfds = *get_fdset();
/* Wait on data. */
nready = select(get_highestfd() + 1, &readfds, NULL, NULL, NULL);
/* If something goes wrong, bail. */
if (nready <= 0)
break;
/* For each connection */
for (i = 0; i <= get_number_of_connections(); ++i)
{
int fd;
struct connection *p;
p = get_connection(i);
/* If this connection is invalid, bail. */
if (!p)
break;
/* Get the file descriptor */
fd = p -> fd;
/* If this file descriptor has data waiting, */
if (FD_ISSET(fd, &readfds))
{
p->process(fd);
}
}
}
}
// ---------------------------------------------------------------
static void close_all(void)
{
int i = 0;
/* For each connection */
for (i = 0; i <= get_number_of_connections(); ++i)
{
struct connection *p;
p = get_connection(i);
/* If this connection is invalid, try the next. */
if (p == 0)
continue;
close(p -> fd);
}
}
// ---------------------------------------------------------------
int main(void)
{
printf("Kernel ACPI Event Monitor...\n");
open_proc();
open_input();
open_netlink();
printf("Press Escape to exit, or Ctrl-C if that doesn't work.\n");
monitor();
printf("Closing files...\n");
close_all();
printf("Goodbye\n");
return 0;
}