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openharmony_kernel_liteos_a/shell/full/src/cmds/dmesg.c

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/*
* Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
* Copyright (c) 2020-2021 Huawei Device Co., Ltd. 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 copyright holder 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.
*/
/*
+-------------------------------------------------------+
| Info | log_space |
+-------------------------------------------------------+
|
|__buffer_space
Case A:
+-------------------------------------------------------+
| |#############################| |
+-------------------------------------------------------+
| |
Head Tail
Case B:
+-------------------------------------------------------+
|##########| |#######|
+-------------------------------------------------------+
| |
Tail Head
*/
#ifdef LOSCFG_SHELL_DMESG
#include "dmesg_pri.h"
#include "show.h"
#include "shcmd.h"
#include "securec.h"
#include "stdlib.h"
#include "unistd.h"
#include "los_init.h"
#include "los_task.h"
#define BUF_MAX_INDEX (g_logBufSize - 1)
LITE_OS_SEC_BSS STATIC SPIN_LOCK_INIT(g_dmesgSpin);
STATIC DmesgInfo *g_dmesgInfo = NULL;
STATIC UINT32 g_logBufSize = 0;
STATIC VOID *g_mallocAddr = NULL;
STATIC UINT32 g_dmesgLogLevel = 3;
STATIC UINT32 g_consoleLock = 0;
STATIC UINT32 g_uartLock = 0;
STATIC const CHAR *g_levelString[] = {
"EMG",
"COMMON",
"ERR",
"WARN",
"INFO",
"DEBUG"
};
STATIC VOID OsLockConsole(VOID)
{
g_consoleLock = 1;
}
STATIC VOID OsUnlockConsole(VOID)
{
g_consoleLock = 0;
}
STATIC VOID OsLockUart(VOID)
{
g_uartLock = 1;
}
STATIC VOID OsUnlockUart(VOID)
{
g_uartLock = 0;
}
STATIC UINT32 OsCheckError(VOID)
{
if (g_dmesgInfo == NULL) {
return LOS_NOK;
}
if (g_dmesgInfo->logSize > g_logBufSize) {
return LOS_NOK;
}
if (((g_dmesgInfo->logSize == g_logBufSize) || (g_dmesgInfo->logSize == 0)) &&
(g_dmesgInfo->logTail != g_dmesgInfo->logHead)) {
return LOS_NOK;
}
return LOS_OK;
}
STATIC INT32 OsDmesgRead(CHAR *buf, UINT32 len)
{
UINT32 readLen;
UINT32 logSize = g_dmesgInfo->logSize;
UINT32 head = g_dmesgInfo->logHead;
UINT32 tail = g_dmesgInfo->logTail;
CHAR *logBuf = g_dmesgInfo->logBuf;
errno_t ret;
if (OsCheckError()) {
return -1;
}
if (logSize == 0) {
return 0;
}
readLen = len < logSize ? len : logSize;
if (head < tail) { /* Case A */
ret = memcpy_s(buf, len, logBuf + head, readLen);
if (ret != EOK) {
return -1;
}
g_dmesgInfo->logHead += readLen;
g_dmesgInfo->logSize -= readLen;
} else { /* Case B */
if (readLen <= (g_logBufSize - head)) {
ret = memcpy_s(buf, len, logBuf + head, readLen);
if (ret != EOK) {
return -1;
}
g_dmesgInfo->logHead += readLen;
g_dmesgInfo->logSize -= readLen;
} else {
ret = memcpy_s(buf, len, logBuf + head, g_logBufSize - head);
if (ret != EOK) {
return -1;
}
ret = memcpy_s(buf + g_logBufSize - head, len - (g_logBufSize - head),
logBuf, readLen - (g_logBufSize - head));
if (ret != EOK) {
return -1;
}
g_dmesgInfo->logHead = readLen - (g_logBufSize - head);
g_dmesgInfo->logSize -= readLen;
}
}
return (INT32)readLen;
}
STATIC INT32 OsCopyToNew(const VOID *addr, UINT32 size)
{
UINT32 copyStart = 0;
UINT32 copyLen;
CHAR *temp = NULL;
CHAR *newBuf = (CHAR *)addr + sizeof(DmesgInfo);
UINT32 bufSize = size - sizeof(DmesgInfo);
INT32 ret;
if (g_dmesgInfo->logSize == 0) {
return 0;
}
temp = (CHAR *)malloc(g_dmesgInfo->logSize);
if (temp == NULL) {
return -1;
}
(VOID)memset_s(temp, g_dmesgInfo->logSize, 0, g_dmesgInfo->logSize);
copyLen = ((bufSize < g_dmesgInfo->logSize) ? bufSize : g_dmesgInfo->logSize);
if (bufSize < g_dmesgInfo->logSize) {
copyStart = g_dmesgInfo->logSize - bufSize;
}
ret = OsDmesgRead(temp, g_dmesgInfo->logSize);
if (ret <= 0) {
PRINT_ERR("%s,%d failed, err:%d!\n", __FUNCTION__, __LINE__, ret);
free(temp);
return -1;
}
/* if new buf size smaller than logSize */
ret = memcpy_s(newBuf, bufSize, temp + copyStart, copyLen);
if (ret != EOK) {
PRINT_ERR("%s,%d memcpy_s failed, err:%d!\n", __FUNCTION__, __LINE__, ret);
free(temp);
return -1;
}
free(temp);
return (INT32)copyLen;
}
STATIC UINT32 OsDmesgResetMem(const VOID *addr, UINT32 size)
{
VOID *temp = NULL;
INT32 copyLen;
UINT32 intSave;
if (size <= sizeof(DmesgInfo)) {
return LOS_NOK;
}
LOS_SpinLockSave(&g_dmesgSpin, &intSave);
temp = g_dmesgInfo;
copyLen = OsCopyToNew(addr, size);
if (copyLen < 0) {
LOS_SpinUnlockRestore(&g_dmesgSpin, intSave);
return LOS_NOK;
}
g_logBufSize = size - sizeof(DmesgInfo);
g_dmesgInfo = (DmesgInfo *)addr;
g_dmesgInfo->logBuf = (CHAR *)addr + sizeof(DmesgInfo);
g_dmesgInfo->logSize = copyLen;
g_dmesgInfo->logTail = ((copyLen == g_logBufSize) ? 0 : copyLen);
g_dmesgInfo->logHead = 0;
/* if old mem came from malloc */
if (temp == g_mallocAddr) {
g_mallocAddr = NULL;
free(temp);
}
LOS_SpinUnlockRestore(&g_dmesgSpin, intSave);
return LOS_OK;
}
STATIC UINT32 OsDmesgChangeSize(UINT32 size)
{
VOID *temp = NULL;
INT32 copyLen;
CHAR *newString = NULL;
UINT32 intSave;
if (size == 0) {
return LOS_NOK;
}
newString = (CHAR *)malloc(size + sizeof(DmesgInfo));
if (newString == NULL) {
return LOS_NOK;
}
LOS_SpinLockSave(&g_dmesgSpin, &intSave);
temp = g_dmesgInfo;
copyLen = OsCopyToNew(newString, size + sizeof(DmesgInfo));
if (copyLen < 0) {
LOS_SpinUnlockRestore(&g_dmesgSpin, intSave);
free(newString);
return LOS_NOK;
}
g_logBufSize = size;
g_dmesgInfo = (DmesgInfo *)newString;
g_dmesgInfo->logBuf = (CHAR *)newString + sizeof(DmesgInfo);
g_dmesgInfo->logSize = copyLen;
g_dmesgInfo->logTail = ((copyLen == g_logBufSize) ? 0 : copyLen);
g_dmesgInfo->logHead = 0;
if (temp == g_mallocAddr) {
g_mallocAddr = NULL;
free(temp);
}
g_mallocAddr = newString;
LOS_SpinUnlockRestore(&g_dmesgSpin, intSave);
return LOS_OK;
}
UINT32 OsCheckConsoleLock(VOID)
{
return g_consoleLock;
}
UINT32 OsCheckUartLock(VOID)
{
return g_uartLock;
}
UINT32 OsDmesgInit(VOID)
{
CHAR* buffer = NULL;
buffer = (CHAR *)malloc(KERNEL_LOG_BUF_SIZE + sizeof(DmesgInfo));
if (buffer == NULL) {
return LOS_NOK;
}
g_mallocAddr = buffer;
g_dmesgInfo = (DmesgInfo *)buffer;
g_dmesgInfo->logHead = 0;
g_dmesgInfo->logTail = 0;
g_dmesgInfo->logSize = 0;
g_dmesgInfo->logBuf = buffer + sizeof(DmesgInfo);
g_logBufSize = KERNEL_LOG_BUF_SIZE;
return LOS_OK;
}
STATIC CHAR OsLogRecordChar(CHAR c)
{
*(g_dmesgInfo->logBuf + g_dmesgInfo->logTail++) = c;
if (g_dmesgInfo->logTail > BUF_MAX_INDEX) {
g_dmesgInfo->logTail = 0;
}
if (g_dmesgInfo->logSize < g_logBufSize) {
(g_dmesgInfo->logSize)++;
} else {
g_dmesgInfo->logHead = g_dmesgInfo->logTail;
}
return c;
}
UINT32 OsLogRecordStr(const CHAR *str, UINT32 len)
{
UINT32 i = 0;
UINTPTR intSave;
LOS_SpinLockSave(&g_dmesgSpin, &intSave);
while (len--) {
(VOID)OsLogRecordChar(str[i]);
i++;
}
LOS_SpinUnlockRestore(&g_dmesgSpin, intSave);
return i;
}
STATIC VOID OsBufFullWrite(const CHAR *dst, UINT32 logLen)
{
UINT32 bufSize = g_logBufSize;
UINT32 tail = g_dmesgInfo->logTail;
CHAR *buf = g_dmesgInfo->logBuf;
errno_t ret;
if (!logLen || (dst == NULL)) {
return;
}
if (logLen > bufSize) { /* full re-write */
ret = memcpy_s(buf + tail, bufSize - tail, dst, bufSize - tail);
if (ret != EOK) {
PRINT_ERR("%s,%d memcpy_s failed, err:%d!\n", __FUNCTION__, __LINE__, ret);
return;
}
ret = memcpy_s(buf, bufSize, dst + bufSize - tail, tail);
if (ret != EOK) {
PRINT_ERR("%s,%d memcpy_s failed, err:%d!\n", __FUNCTION__, __LINE__, ret);
return;
}
OsBufFullWrite(dst + bufSize, logLen - bufSize);
} else {
if (logLen > (bufSize - tail)) { /* need cycle back to start */
ret = memcpy_s(buf + tail, bufSize - tail, dst, bufSize - tail);
if (ret != EOK) {
PRINT_ERR("%s,%d memcpy_s failed, err:%d!\n", __FUNCTION__, __LINE__, ret);
return;
}
ret = memcpy_s(buf, bufSize, dst + bufSize - tail, logLen - (bufSize - tail));
if (ret != EOK) {
PRINT_ERR("%s,%d memcpy_s failed, err:%d!\n", __FUNCTION__, __LINE__, ret);
return;
}
g_dmesgInfo->logTail = logLen - (bufSize - tail);
g_dmesgInfo->logHead = g_dmesgInfo->logTail;
} else { /* no need cycle back to start */
ret = memcpy_s(buf + tail, bufSize - tail, dst, logLen);
if (ret != EOK) {
PRINT_ERR("%s,%d memcpy_s failed, err:%d!\n", __FUNCTION__, __LINE__, ret);
return;
}
g_dmesgInfo->logTail += logLen;
if (g_dmesgInfo->logTail > BUF_MAX_INDEX) {
g_dmesgInfo->logTail = 0;
}
g_dmesgInfo->logHead = g_dmesgInfo->logTail;
}
}
}
STATIC VOID OsWriteTailToHead(const CHAR *dst, UINT32 logLen)
{
UINT32 writeLen = 0;
UINT32 bufSize = g_logBufSize;
UINT32 logSize = g_dmesgInfo->logSize;
UINT32 tail = g_dmesgInfo->logTail;
CHAR *buf = g_dmesgInfo->logBuf;
errno_t ret;
if ((!logLen) || (dst == NULL)) {
return;
}
if (logLen > (bufSize - logSize)) { /* space-need > space-remain */
writeLen = bufSize - logSize;
ret = memcpy_s(buf + tail, bufSize - tail, dst, writeLen);
if (ret != EOK) {
PRINT_ERR("%s,%d memcpy_s failed, err:%d!\n", __FUNCTION__, __LINE__, ret);
return;
}
g_dmesgInfo->logTail = g_dmesgInfo->logHead;
g_dmesgInfo->logSize = g_logBufSize;
OsBufFullWrite(dst + writeLen, logLen - writeLen);
} else {
ret = memcpy_s(buf + tail, bufSize - tail, dst, logLen);
if (ret != EOK) {
PRINT_ERR("%s,%d memcpy_s failed, err:%d!\n", __FUNCTION__, __LINE__, ret);
return;
}
g_dmesgInfo->logTail += logLen;
g_dmesgInfo->logSize += logLen;
}
}
STATIC VOID OsWriteTailToEnd(const CHAR *dst, UINT32 logLen)
{
UINT32 writeLen;
UINT32 bufSize = g_logBufSize;
UINT32 tail = g_dmesgInfo->logTail;
CHAR *buf = g_dmesgInfo->logBuf;
errno_t ret;
if ((!logLen) || (dst == NULL)) {
return;
}
if (logLen >= (bufSize - tail)) { /* need cycle to start ,then became B */
writeLen = bufSize - tail;
ret = memcpy_s(buf + tail, writeLen, dst, writeLen);
if (ret != EOK) {
PRINT_ERR("%s,%d memcpy_s failed, err:%d!\n", __FUNCTION__, __LINE__, ret);
return;
}
g_dmesgInfo->logSize += writeLen;
g_dmesgInfo->logTail = 0;
if (g_dmesgInfo->logSize == g_logBufSize) { /* Tail = Head is 0 */
OsBufFullWrite(dst + writeLen, logLen - writeLen);
} else {
OsWriteTailToHead(dst + writeLen, logLen - writeLen);
}
} else { /* just do serial copy */
ret = memcpy_s(buf + tail, bufSize - tail, dst, logLen);
if (ret != EOK) {
PRINT_ERR("%s,%d memcpy_s failed, err:%d!\n", __FUNCTION__, __LINE__, ret);
return;
}
g_dmesgInfo->logTail += logLen;
g_dmesgInfo->logSize += logLen;
}
}
INT32 OsLogMemcpyRecord(const CHAR *buf, UINT32 logLen)
{
UINT32 intSave;
LOS_SpinLockSave(&g_dmesgSpin, &intSave);
if (OsCheckError()) {
LOS_SpinUnlockRestore(&g_dmesgSpin, intSave);
return -1;
}
if (g_dmesgInfo->logSize < g_logBufSize) {
if (g_dmesgInfo->logHead <= g_dmesgInfo->logTail) {
OsWriteTailToEnd(buf, logLen);
} else {
OsWriteTailToHead(buf, logLen);
}
} else {
OsBufFullWrite(buf, logLen);
}
LOS_SpinUnlockRestore(&g_dmesgSpin, intSave);
return LOS_OK;
}
VOID OsLogShow(VOID)
{
UINT32 intSave;
UINT32 index;
UINT32 i = 0;
CHAR *p = NULL;
LOS_SpinLockSave(&g_dmesgSpin, &intSave);
index = g_dmesgInfo->logHead;
p = (CHAR *)malloc(g_dmesgInfo->logSize + 1);
if (p == NULL) {
LOS_SpinUnlockRestore(&g_dmesgSpin, intSave);
return;
}
(VOID)memset_s(p, g_dmesgInfo->logSize + 1, 0, g_dmesgInfo->logSize + 1);
while (i < g_dmesgInfo->logSize) {
*(p + i) = *(g_dmesgInfo->logBuf + index++);
if (index > BUF_MAX_INDEX) {
index = 0;
}
i++;
if (index == g_dmesgInfo->logTail) {
break;
}
}
LOS_SpinUnlockRestore(&g_dmesgSpin, intSave);
UartPuts(p, i, UART_WITH_LOCK);
free(p);
}
STATIC INT32 OsDmesgLvSet(const CHAR *level)
{
UINT32 levelNum, ret;
CHAR *p = NULL;
levelNum = strtoul(level, &p, 0);
if (*p != 0) {
PRINTK("dmesg: invalid option or parameter.\n");
return -1;
}
ret = LOS_DmesgLvSet(levelNum);
if (ret == LOS_OK) {
PRINTK("Set current dmesg log level %s\n", g_levelString[g_dmesgLogLevel]);
return LOS_OK;
} else {
PRINTK("current dmesg log level %s\n", g_levelString[g_dmesgLogLevel]);
PRINTK("dmesg -l [num] can access as 0:EMG 1:COMMON 2:ERROR 3:WARN 4:INFO 5:DEBUG\n");
return -1;
}
}
STATIC INT32 OsDmesgMemSizeSet(const CHAR *size)
{
UINT32 sizeVal;
CHAR *p = NULL;
sizeVal = strtoul(size, &p, 0);
if (sizeVal > MAX_KERNEL_LOG_BUF_SIZE) {
goto ERR_OUT;
}
if (!(LOS_DmesgMemSet(NULL, sizeVal))) {
PRINTK("Set dmesg buf size %u success\n", sizeVal);
return LOS_OK;
} else {
goto ERR_OUT;
}
ERR_OUT:
PRINTK("Set dmesg buf size %u fail\n", sizeVal);
return LOS_NOK;
}
UINT32 OsDmesgLvGet(VOID)
{
return g_dmesgLogLevel;
}
UINT32 LOS_DmesgLvSet(UINT32 level)
{
if (level > 5) { /* 5: count of level */
return LOS_NOK;
}
g_dmesgLogLevel = level;
return LOS_OK;
}
VOID LOS_DmesgClear(VOID)
{
UINT32 intSave;
LOS_SpinLockSave(&g_dmesgSpin, &intSave);
(VOID)memset_s(g_dmesgInfo->logBuf, g_logBufSize, 0, g_logBufSize);
g_dmesgInfo->logHead = 0;
g_dmesgInfo->logTail = 0;
g_dmesgInfo->logSize = 0;
LOS_SpinUnlockRestore(&g_dmesgSpin, intSave);
}
UINT32 LOS_DmesgMemSet(const VOID *addr, UINT32 size)
{
UINT32 ret = 0;
if (addr == NULL) {
ret = OsDmesgChangeSize(size);
} else {
ret = OsDmesgResetMem(addr, size);
}
return ret;
}
INT32 LOS_DmesgRead(CHAR *buf, UINT32 len)
{
INT32 ret;
UINT32 intSave;
if (buf == NULL) {
return -1;
}
if (len == 0) {
return 0;
}
LOS_SpinLockSave(&g_dmesgSpin, &intSave);
ret = OsDmesgRead(buf, len);
LOS_SpinUnlockRestore(&g_dmesgSpin, intSave);
return ret;
}
INT32 OsDmesgWrite2File(const CHAR *fullpath, const CHAR *buf, UINT32 logSize)
{
INT32 ret;
INT32 fd = open(fullpath, O_CREAT | O_RDWR | O_APPEND, 0644); /* 0644:file right */
if (fd < 0) {
return -1;
}
ret = write(fd, buf, logSize);
(VOID)close(fd);
return ret;
}
#ifdef LOSCFG_FS_VFS
INT32 LOS_DmesgToFile(const CHAR *filename)
{
CHAR *fullpath = NULL;
CHAR *buf = NULL;
INT32 ret;
CHAR *shellWorkingDirectory = OsShellGetWorkingDirtectory();
UINT32 logSize, bufSize, head, tail, intSave;
CHAR *logBuf = NULL;
LOS_SpinLockSave(&g_dmesgSpin, &intSave);
if (OsCheckError()) {
LOS_SpinUnlockRestore(&g_dmesgSpin, intSave);
return -1;
}
logSize = g_dmesgInfo->logSize;
bufSize = g_logBufSize;
head = g_dmesgInfo->logHead;
tail = g_dmesgInfo->logTail;
logBuf = g_dmesgInfo->logBuf;
LOS_SpinUnlockRestore(&g_dmesgSpin, intSave);
ret = vfs_normalize_path(shellWorkingDirectory, filename, &fullpath);
if (ret != 0) {
return -1;
}
buf = (CHAR *)malloc(logSize);
if (buf == NULL) {
goto ERR_OUT2;
}
if (head < tail) {
ret = memcpy_s(buf, logSize, logBuf + head, logSize);
if (ret != EOK) {
goto ERR_OUT3;
}
} else {
ret = memcpy_s(buf, logSize, logBuf + head, bufSize - head);
if (ret != EOK) {
goto ERR_OUT3;
}
ret = memcpy_s(buf + bufSize - head, logSize - (bufSize - head), logBuf, tail);
if (ret != EOK) {
goto ERR_OUT3;
}
}
ret = OsDmesgWrite2File(fullpath, buf, logSize);
ERR_OUT3:
free(buf);
ERR_OUT2:
free(fullpath);
return ret;
}
#else
INT32 LOS_DmesgToFile(CHAR *filename)
{
(VOID)filename;
PRINTK("File operation need VFS\n");
return -1;
}
#endif
INT32 OsShellCmdDmesg(INT32 argc, const CHAR **argv)
{
if (argc == 1) {
PRINTK("\n");
OsLogShow();
return LOS_OK;
} else if (argc == 2) { /* 2: count of parameters */
if (argv == NULL) {
goto ERR_OUT;
}
if (!strcmp(argv[1], "-c")) {
PRINTK("\n");
OsLogShow();
LOS_DmesgClear();
return LOS_OK;
} else if (!strcmp(argv[1], "-C")) {
LOS_DmesgClear();
return LOS_OK;
} else if (!strcmp(argv[1], "-D")) {
OsLockConsole();
return LOS_OK;
} else if (!strcmp(argv[1], "-E")) {
OsUnlockConsole();
return LOS_OK;
} else if (!strcmp(argv[1], "-L")) {
OsLockUart();
return LOS_OK;
} else if (!strcmp(argv[1], "-U")) {
OsUnlockUart();
return LOS_OK;
}
} else if (argc == 3) { /* 3: count of parameters */
if (argv == NULL) {
goto ERR_OUT;
}
if (!strcmp(argv[1], ">")) {
if (LOS_DmesgToFile((CHAR *)argv[2]) < 0) { /* 2:index of parameters */
PRINTK("Dmesg write log to %s fail \n", argv[2]); /* 2:index of parameters */
return -1;
} else {
PRINTK("Dmesg write log to %s success \n", argv[2]); /* 2:index of parameters */
return LOS_OK;
}
} else if (!strcmp(argv[1], "-l")) {
return OsDmesgLvSet(argv[2]); /* 2:index of parameters */
} else if (!strcmp(argv[1], "-s")) {
return OsDmesgMemSizeSet(argv[2]); /* 2:index of parameters */
}
}
ERR_OUT:
PRINTK("dmesg: invalid option or parameter.\n");
return -1;
}
SHELLCMD_ENTRY(dmesg_shellcmd, CMD_TYPE_STD, "dmesg", XARGS, (CmdCallBackFunc)OsShellCmdDmesg);
LOS_MODULE_INIT(OsDmesgInit, LOS_INIT_LEVEL_EARLIEST);
#endif
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