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/*
* Copyright (c) 2013 TRUSTONIC LIMITED
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the TRUSTONIC LIMITED nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* Kernel Module Interface.
*/
#include <cstdlib>
#include <string.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <errno.h>
#include "CKMod.h"
#include "log.h"
#define INVALID_FILE_DESCRIPTOR ((int)(-1))
//------------------------------------------------------------------------------
CKMod::CKMod(void)
{
fdKMod = INVALID_FILE_DESCRIPTOR;
}
//------------------------------------------------------------------------------
CKMod::~CKMod(void)
{
close();
}
//------------------------------------------------------------------------------
bool CKMod::isOpen(void)
{
return (INVALID_FILE_DESCRIPTOR == fdKMod) ? false : true;
}
//------------------------------------------------------------------------------
mcResult_t CKMod::open(const char *deviceName)
{
if (isOpen()) {
LOG_W("already open");
return MC_DRV_ERR_DEVICE_ALREADY_OPEN;
}
LOG_I(" Opening kernel module at %s.", deviceName);
// open return -1 on error, "errno" is set with details
int openRet = ::open(deviceName, O_RDWR);
if (openRet == -1) {
LOG_ERRNO("open");
return MAKE_MC_DRV_KMOD_WITH_ERRNO(errno);
}
fdKMod = openRet;
return MC_DRV_OK;
}
//------------------------------------------------------------------------------
void CKMod::close(
void
)
{
if (isOpen()) {
if (::close(fdKMod) != 0) {
LOG_ERRNO("close");
} else {
fdKMod = INVALID_FILE_DESCRIPTOR;
}
} else {
LOG_W(" Kernel module device not open");
}
}
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