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/*
* @copyright Copyright (c) 2016-2020 TOYOTA MOTOR CORPORATION.
*
* 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.
*/
//////////////////////////////////////////////////////////////////////////////////////////////////
/// \ingroup tag_NSSharedMemory
/// \brief SharedMemIf implementation
///
/// Implements interface functions to SharedMem service
//////////////////////////////////////////////////////////////////////////////////////////////////
#include <native_service/ns_shared_mem_if.h> ///< Shared mem source interface file
#include <native_service/ns_logger_if.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <time.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#define NS_SHM_HEADER_SIZE (48)
/////////////////////////////////////////////////////////////////////////////
/// Utility functions and classes
static TMemID getclock(void) {
struct timespec tp;
if (clock_gettime(CLOCK_MONOTONIC_RAW, &tp) < 0) { // LCOV_EXCL_BR_LINE 5: clock_gettime's error case.
return 0;
}
return (TMemID)(((uint64_t)tp.tv_sec * 1000 * 1000 * 1000 + tp.tv_nsec) >> 8);
}
static size_t uitoa(unsigned int value, char *buf) {
static const char c[] = "0123456789abcdef";
int i;
if (buf == NULL) {
FRAMEWORKUNIFIEDLOG(ZONE_NS_ERR, __func__, "buf is NULL");
return 0;
}
for (i = 0; i < 8; i++) {
buf[i] = c[(value >> ((7 - i) * 4)) & 0xf];
}
buf[i] = '\0';
return i;
}
static inline void create_shmname(char *buf, TMemID id) {
if (buf == NULL) {
FRAMEWORKUNIFIEDLOG(ZONE_NS_ERR, __func__, "buf is NULL");
return;
}
strcpy(buf, "nsshm_"); // NOLINT (readability/nolint)
buf += sizeof("nsshm_") - 1;
uitoa(id, buf);
}
//////////////////////////////////////////////////////////////////////////////////////////////////
// Public interface function definitions
TMemID SetDataToShared(const void *data, UI_32 dataBytes, const char *from, const char *to) {
TMemID id;
char shmname[16];
int fd;
void *addr = MAP_FAILED;
if (data == NULL) {
FRAMEWORKUNIFIEDLOG(ZONE_NS_ERR, __func__, "data is NULL");
return BAD_MEM_ID;
}
if (from == NULL) {
FRAMEWORKUNIFIEDLOG(ZONE_NS_ERR, __func__, "from is NULL");
return BAD_MEM_ID;
}
if (to == NULL) {
FRAMEWORKUNIFIEDLOG(ZONE_NS_ERR, __func__, "to is NULL");
return BAD_MEM_ID;
}
if (dataBytes == 0) {
FRAMEWORKUNIFIEDLOG(ZONE_NS_ERR, __func__, "DataSize is invalied(%d)", dataBytes);
return BAD_MEM_ID;
}
while (1) {
id = getclock();
create_shmname(shmname, id);
if ((fd = shm_open(shmname, O_CREAT | O_EXCL | O_RDWR, 0666)) < 0) {
if (errno == EEXIST) {
continue;
}
FRAMEWORKUNIFIEDLOG(ZONE_NS_ERR, __func__, "shm_open: %s", strerror(errno));
return BAD_MEM_ID;
}
break;
}
if (ftruncate(fd, dataBytes + NS_SHM_HEADER_SIZE) < 0) { // LCOV_EXCL_BR_LINE 5: ftruncate's error case.
FRAMEWORKUNIFIEDLOG(ZONE_NS_ERR, __func__, "ftruncate: %s", strerror(errno));
id = BAD_MEM_ID;
goto exit;
}
if ((addr = mmap(NULL, dataBytes + NS_SHM_HEADER_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0)) == MAP_FAILED) {
FRAMEWORKUNIFIEDLOG(ZONE_NS_ERR, __func__, "mmap: %s", strerror(errno));
id = BAD_MEM_ID;
goto exit;
}
strcpy(reinterpret_cast<char *>(addr), from); // NOLINT (readability/nolint)
strcpy(reinterpret_cast<char *>(addr) + (NS_SHM_HEADER_SIZE / 2), to); // NOLINT (readability/nolint)
/**
* @todo
* Specifying a large number (4097 or higher) for the Session Data Size for transmission results in a segmentation fault.
*/
memcpy(reinterpret_cast<char *>(addr) + NS_SHM_HEADER_SIZE, data, dataBytes);
exit:
close(fd);
if (addr != MAP_FAILED) {
munmap(addr, dataBytes + NS_SHM_HEADER_SIZE);
}
if (id == BAD_MEM_ID) {
shm_unlink(shmname);
}
return id;
}
EFrameworkunifiedStatus GetDataFromShared(TMemID id, void *data, UI_32 dataMaxBytes) {
EFrameworkunifiedStatus eStatus = eFrameworkunifiedStatusFail;
char shmname[16];
int fd;
void *addr = MAP_FAILED;
struct stat sb;
if (id == BAD_MEM_ID) {
FRAMEWORKUNIFIEDLOG(ZONE_NS_ERR, __func__, "ShMemID is invalied(%u)", id);
return eFrameworkunifiedStatusInvldParam;
}
if (data == NULL) {
FRAMEWORKUNIFIEDLOG(ZONE_NS_ERR, __func__, "data is NULL");
return eFrameworkunifiedStatusInvldParam;
}
if (dataMaxBytes == 0) {
FRAMEWORKUNIFIEDLOG(ZONE_NS_ERR, __func__, "DataSize is invalied(%d)", dataMaxBytes);
return eFrameworkunifiedStatusInvldParam;
}
create_shmname(shmname, id);
if ((fd = shm_open(shmname, O_RDONLY, 0)) < 0) {
if (errno == ENOENT) {
eStatus = eFrameworkunifiedStatusInvldID;
}
FRAMEWORKUNIFIEDLOG(ZONE_NS_ERR, __func__, "shm_open: %s", strerror(errno));
return eStatus;
}
if (fstat(fd, &sb) < 0) { // LCOV_EXCL_BR_LINE 5: fstat's error case
FRAMEWORKUNIFIEDLOG(ZONE_NS_ERR, __func__, "fstat: %s", strerror(errno));
goto exit;
}
if (sb.st_size - NS_SHM_HEADER_SIZE > static_cast<SI_64>(dataMaxBytes)) {
FRAMEWORKUNIFIEDLOG(ZONE_NS_ERR, __func__, "DataSize is invalied(%d-%d)", dataMaxBytes, (int)sb.st_size);
eStatus = eFrameworkunifiedStatusInvldParam;
goto exit;
}
if ((addr = mmap(NULL, sb.st_size, PROT_READ, MAP_SHARED, fd, 0)) == MAP_FAILED) { // LCOV_EXCL_BR_LINE 5: mmap's error case.
AGL_ASSERT_NOT_TESTED(); // LCOV_EXCL_LINE 200: test assert
FRAMEWORKUNIFIEDLOG(ZONE_NS_ERR, __func__, "mmap: %s", strerror(errno)); // LCOV_EXCL_LINE 5: mmap's error case.
goto exit;
}
memcpy(data, reinterpret_cast<char *>(addr) + NS_SHM_HEADER_SIZE, sb.st_size - NS_SHM_HEADER_SIZE);
eStatus = eFrameworkunifiedStatusOK;
exit:
close(fd);
if (addr != MAP_FAILED) {
munmap(addr, sb.st_size);
}
return eStatus;
}
UI_32 GetLengthOfDataFromShared(TMemID id) {
UI_32 size = 0;
char shmname[16];
int fd;
struct stat sb;
if (id == BAD_MEM_ID) {
FRAMEWORKUNIFIEDLOG(ZONE_NS_ERR, __func__, "ShMemID is invalied(%u)", id); // LCOV_EXCL_BR_LINE 15:marco defined in "native_service/ns_logger_if.h"
return 0;
}
create_shmname(shmname, id);
if ((fd = shm_open(shmname, O_RDWR, 0)) < 0) {
FRAMEWORKUNIFIEDLOG(ZONE_NS_ERR, __func__, "shm_open: %s", strerror(errno));
return 0;
}
if (fstat(fd, &sb) < 0) { // LCOV_EXCL_BR_LINE 5: fstat's error case.
AGL_ASSERT_NOT_TESTED(); // LCOV_EXCL_LINE 200: test assert
FRAMEWORKUNIFIEDLOG(ZONE_NS_ERR, __func__, "fstat: %s", strerror(errno)); // LCOV_EXCL_LINE 5: mmap's error case.
goto exit;
}
size = static_cast<UI_32>(sb.st_size - NS_SHM_HEADER_SIZE);
exit:
close(fd);
return size;
}
EFrameworkunifiedStatus DiscardDataFromShared(TMemID id) {
EFrameworkunifiedStatus eStatus = eFrameworkunifiedStatusOK;
char shmname[16];
if (id == BAD_MEM_ID) {
FRAMEWORKUNIFIEDLOG(ZONE_NS_ERR, __func__, "ShMemID is invalied(%u)", id);
return eFrameworkunifiedStatusInvldParam;
}
create_shmname(shmname, id);
if (shm_unlink(shmname) < 0) {
if (errno == ENOENT) {
eStatus = eFrameworkunifiedStatusInvldID;
} else {
eStatus = eFrameworkunifiedStatusFail;
}
FRAMEWORKUNIFIEDLOG(ZONE_NS_ERR, __func__, "shm_unlink: %s", strerror(errno));
}
return eStatus;
}
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