1 /** @addtogroup MCD_MCDIMPL_DAEMON_KERNEL
2 * @{
3 * @file
4 *
5 * Kernel Module Interface.
6 *
7 * <!-- Copyright Giesecke & Devrient GmbH 2009 - 2012 -->
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. The name of the author may not be used to endorse or promote
18 * products derived from this software without specific prior
19 * written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
22 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
23 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
25 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
27 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
29 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
30 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
31 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33 #include <cstdlib>
34
35 #include <fcntl.h>
36 #include <sys/mman.h>
37 #include <errno.h>
38
39 #include "CKMod.h"
40
41 #include "log.h"
42
43 #define INVALID_FILE_DESCRIPTOR ((int)(-1))
44
45 //------------------------------------------------------------------------------
CKMod(void)46 CKMod::CKMod(void)
47 {
48 fdKMod = INVALID_FILE_DESCRIPTOR;
49 }
50
51
52 //------------------------------------------------------------------------------
~CKMod(void)53 CKMod::~CKMod(void)
54 {
55 close();
56 }
57
58
59 //------------------------------------------------------------------------------
isOpen(void)60 bool CKMod::isOpen(void)
61 {
62 return (INVALID_FILE_DESCRIPTOR == fdKMod) ? false : true;
63 }
64
65
66 //------------------------------------------------------------------------------
open(const char * deviceName)67 mcResult_t CKMod::open(const char *deviceName)
68 {
69 if (isOpen()) {
70 LOG_W("already open");
71 return MC_DRV_ERR_DEVICE_ALREADY_OPEN;
72 }
73
74 LOG_I(" Opening kernel module at %s.", deviceName);
75
76 // open return -1 on error, "errno" is set with details
77 int openRet = ::open(deviceName, O_RDWR);
78 if (openRet == -1) {
79 LOG_ERRNO("open");
80 return MAKE_MC_DRV_KMOD_WITH_ERRNO(errno);
81 }
82
83 fdKMod = openRet;
84 return MC_DRV_OK;
85 }
86
87
88 //------------------------------------------------------------------------------
close(void)89 void CKMod::close(
90 void
91 )
92 {
93 if (isOpen()) {
94 if (::close(fdKMod) != 0) {
95 LOG_ERRNO("close");
96 } else {
97 fdKMod = INVALID_FILE_DESCRIPTOR;
98 }
99 } else {
100 LOG_W(" Kernel module device not open");
101 }
102 }
103
104 /** @} */
105