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/*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <malloc.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#define LOG_TAG "Controller"
#include <cutils/log.h>
#include "Controller.h"
extern "C" int init_module(void *, unsigned int, const char *);
extern "C" int delete_module(const char *, unsigned int);
Controller::Controller(const char *name, const char *prefix) {
mName = name;
mPropertyPrefix = prefix;
mProperties = new PropertyCollection();
mEnabled = false;
registerProperty("enable");
}
int Controller::start() {
return 0;
}
int Controller::stop() {
return 0;
}
const PropertyCollection & Controller::getProperties() {
return *mProperties;
}
int Controller::setProperty(const char *name, char *value) {
if (!strcmp(name, "enable")) {
int en = atoi(value);
int rc;
rc = (en ? enable() : disable());
if (!rc)
mEnabled = en;
return rc;
}
errno = ENOENT;
return -1;
}
const char *Controller::getProperty(const char *name, char *buffer, size_t maxsize) {
if (!strcmp(name, "enable")) {
snprintf(buffer, maxsize, "%d", mEnabled);
return buffer;
}
errno = ENOENT;
return NULL;
}
int Controller::registerProperty(const char *name) {
PropertyCollection::iterator it;
for (it = mProperties->begin(); it != mProperties->end(); ++it) {
if (!strcmp(name, (*it))) {
errno = EADDRINUSE;
LOGE("Failed to register property (%s)", strerror(errno));
return -1;
}
}
mProperties->push_back(name);
return 0;
}
int Controller::unregisterProperty(const char *name) {
PropertyCollection::iterator it;
for (it = mProperties->begin(); it != mProperties->end(); ++it) {
if (!strcmp(name, (*it))) {
mProperties->erase(it);
return 0;
}
}
errno = ENOENT;
return -1;
}
int Controller::loadKernelModule(char *modpath, const char *args) {
void *module;
unsigned int size;
module = loadFile(modpath, &size);
if (!module) {
errno = -EIO;
return -1;
}
int rc = init_module(module, size, args);
free (module);
return rc;
}
int Controller::unloadKernelModule(const char *modtag) {
int rc = -1;
int retries = 10;
while (retries--) {
rc = delete_module(modtag, O_NONBLOCK | O_EXCL);
if (rc < 0 && errno == EAGAIN)
usleep(1000*500);
else
break;
}
if (rc != 0) {
LOGW("Unable to unload kernel driver '%s' (%s)", modtag,
strerror(errno));
}
return rc;
}
bool Controller::isKernelModuleLoaded(const char *modtag) {
FILE *fp = fopen("/proc/modules", "r");
if (!fp) {
LOGE("Unable to open /proc/modules (%s)", strerror(errno));
return false;
}
char line[255];
while(fgets(line, sizeof(line), fp)) {
char *endTag = strchr(line, ' ');
if (!endTag) {
LOGW("Unable to find tag for line '%s'", line);
continue;
}
if (!strncmp(line, modtag, (endTag - line))) {
fclose(fp);
return true;
}
}
fclose(fp);
return false;
}
void *Controller::loadFile(char *filename, unsigned int *_size)
{
int ret, fd;
struct stat sb;
ssize_t size;
void *buffer = NULL;
/* open the file */
fd = open(filename, O_RDONLY);
if (fd < 0)
return NULL;
/* find out how big it is */
if (fstat(fd, &sb) < 0)
goto bail;
size = sb.st_size;
/* allocate memory for it to be read into */
buffer = malloc(size);
if (!buffer)
goto bail;
/* slurp it into our buffer */
ret = read(fd, buffer, size);
if (ret != size)
goto bail;
/* let the caller know how big it is */
*_size = size;
bail:
close(fd);
return buffer;
}
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