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/*
* proc.c - ACPI daemon proc filesystem interface
*
* Portions Copyright (C) 2000 Andrew Henroid
* Portions Copyright (C) 2001 Sun Microsystems
* Portions Copyright (C) 2004 Tim Hockin (thockin@hockin.org)
*
* 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
*/
#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include "acpid.h"
#include "log.h"
#include "event.h"
#include "connection_list.h"
#include "libc_compat.h"
#include "proc.h"
const char *eventfile = ACPID_EVENTFILE;
static char *read_line(int fd);
static void
process_proc(int fd)
{
char *event;
/* read an event */
event = read_line(fd);
/* if we're locked, don't process the event */
if (locked()) {
if (logevents && event != NULL) {
acpid_log(LOG_INFO,
"lockfile present, not processing "
"event \"%s\"", event);
}
return;
}
/* handle the event */
if (event) {
if (logevents) {
acpid_log(LOG_INFO,
"procfs received event \"%s\"", event);
}
acpid_handle_event(event);
if (logevents) {
acpid_log(LOG_INFO,
"procfs completed event \"%s\"", event);
}
} else if (errno == EPIPE) {
acpid_log(LOG_WARNING,
"events file connection closed");
exit(EXIT_FAILURE);
} else {
static int nerrs;
if (++nerrs >= ACPID_MAX_ERRS) {
acpid_log(LOG_ERR,
"too many errors reading "
"events file - aborting");
exit(EXIT_FAILURE);
}
}
}
int
open_proc()
{
int fd;
struct connection c;
/* O_CLOEXEC: Make sure scripts we exec() (in event.c) don't get our file
descriptors. */
fd = open(eventfile, O_RDONLY | O_CLOEXEC);
if (fd < 0) {
if (errno == ENOENT) {
acpid_log(LOG_DEBUG, "Deprecated %s was not found. "
"Trying netlink and the input layer...", eventfile);
} else {
acpid_log(LOG_ERR, "can't open %s: %s (%d)", eventfile,
strerror(errno), errno);
}
return -1;
}
acpid_log(LOG_DEBUG, "proc fs opened successfully");
/* add a connection to the list */
c.fd = fd;
c.process = process_proc;
c.pathname = NULL;
c.kybd = 0;
if (add_connection(&c) < 0) {
close(fd);
acpid_log(LOG_ERR, "can't add connection for %s", eventfile);
return -1;
}
return 0;
}
/*
* This depends on fixes in linux ACPI after 2.4.8
*/
#define BUFLEN 1024
static char *
read_line(int fd)
{
static char buf[BUFLEN];
int i = 0;
int r;
int searching = 1;
while (searching) {
memset(buf+i, 0, BUFLEN-i);
/* only go to BUFLEN-1 so there will always be a 0 at the end */
while (i < BUFLEN-1) {
r = TEMP_FAILURE_RETRY(read(fd, buf+i, 1));
if (r < 0) {
/* we should do something with the data */
acpid_log(LOG_ERR, "read(): %s",
strerror(errno));
return NULL;
} else if (r == 0) {
/* signal this in an almost standard way */
errno = EPIPE;
return NULL;
} else if (r == 1) {
/* scan for a newline */
if (buf[i] == '\n') {
searching = 0;
buf[i] = '\0';
break;
}
i++;
}
}
if (i >= BUFLEN - 1)
break;
}
return buf;
}
#if 0
/* This version leaks memory. The above version is simpler and leak-free. */
/* Downside is that the above version always uses 1k of RAM. */
/*
* This depends on fixes in linux ACPI after 2.4.8
*/
#define MAX_BUFLEN 1024
static char *
read_line(int fd)
{
static char *buf;
int buflen = 64;
int i = 0;
int r;
int searching = 1;
while (searching) {
/* ??? This memory is leaked since it is never freed */
buf = realloc(buf, buflen);
if (!buf) {
acpid_log(LOG_ERR, "malloc(%d): %s",
buflen, strerror(errno));
return NULL;
}
memset(buf+i, 0, buflen-i);
while (i < buflen) {
r = read(fd, buf+i, 1);
if (r < 0 && errno != EINTR) {
/* we should do something with the data */
acpid_log(LOG_ERR, "read(): %s",
strerror(errno));
return NULL;
} else if (r == 0) {
/* signal this in an almost standard way */
errno = EPIPE;
return NULL;
} else if (r == 1) {
/* scan for a newline */
if (buf[i] == '\n') {
searching = 0;
buf[i] = '\0';
break;
}
i++;
}
}
if (buflen >= MAX_BUFLEN) {
break;
}
buflen *= 2;
}
return buf;
}
#endif
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