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