[klibc] add kerrno.h

8 files changed, 319 insertions, 257 deletions

diff --git a/include/klibc/kerrno.h b/include/klibc/kerrno.h
new file mode 100644
index 0000000000..2f7699923f
--- /dev/null
+++ b/include/klibc/kerrno.h
@@ -0,0 +1,77 @@
+/*
+ * Copyright (c) 2006-2024, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2024-09-22     Meco Man     the first version
+ */
+
+#ifndef __RT_KERRNO_H__
+#define __RT_KERRNO_H__
+
+#include <rtconfig.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#if defined(RT_USING_LIBC) && !defined(RT_USING_NANO)
+/* POSIX error code compatible */
+#define RT_EOK                          0               /**< There is no error */
+#define RT_ERROR                        255             /**< A generic/unknown error happens */
+#define RT_ETIMEOUT                     ETIMEDOUT       /**< Timed out */
+#define RT_EFULL                        ENOSPC          /**< The resource is full */
+#define RT_EEMPTY                       ENODATA         /**< The resource is empty */
+#define RT_ENOMEM                       ENOMEM          /**< No memory */
+#define RT_ENOSYS                       ENOSYS          /**< Function not implemented */
+#define RT_EBUSY                        EBUSY           /**< Busy */
+#define RT_EIO                          EIO             /**< IO error */
+#define RT_EINTR                        EINTR           /**< Interrupted system call */
+#define RT_EINVAL                       EINVAL          /**< Invalid argument */
+#define RT_ENOENT                       ENOENT          /**< No entry */
+#define RT_ENOSPC                       ENOSPC          /**< No space left */
+#define RT_EPERM                        EPERM           /**< Operation not permitted */
+#define RT_EFAULT                       EFAULT          /**< Bad address */
+#define RT_ENOBUFS                      ENOBUFS         /**< No buffer space is available */
+#define RT_ESCHEDISR                    253             /**< scheduler failure in isr context */
+#define RT_ESCHEDLOCKED                 252             /**< scheduler failure in critical region */
+#define RT_ETRAP                        254             /**< Trap event */
+#else
+#define RT_EOK                          0               /**< There is no error */
+#define RT_ERROR                        1               /**< A generic/unknown error happens */
+#define RT_ETIMEOUT                     2               /**< Timed out */
+#define RT_EFULL                        3               /**< The resource is full */
+#define RT_EEMPTY                       4               /**< The resource is empty */
+#define RT_ENOMEM                       5               /**< No memory */
+#define RT_ENOSYS                       6               /**< Function not implemented */
+#define RT_EBUSY                        7               /**< Busy */
+#define RT_EIO                          8               /**< IO error */
+#define RT_EINTR                        9               /**< Interrupted system call */
+#define RT_EINVAL                       10              /**< Invalid argument */
+#define RT_ENOENT                       11              /**< No entry */
+#define RT_ENOSPC                       12              /**< No space left */
+#define RT_EPERM                        13              /**< Operation not permitted */
+#define RT_ETRAP                        14              /**< Trap event */
+#define RT_EFAULT                       15              /**< Bad address */
+#define RT_ENOBUFS                      16              /**< No buffer space is available */
+#define RT_ESCHEDISR                    17              /**< scheduler failure in isr context */
+#define RT_ESCHEDLOCKED                 18              /**< scheduler failure in critical region */
+#endif /* defined(RT_USING_LIBC) && !defined(RT_USING_NANO) */
+
+rt_err_t rt_get_errno(void);
+void rt_set_errno(rt_err_t no);
+int *_rt_errno(void);
+const char *rt_strerror(rt_err_t error);
+#if !defined(RT_USING_NEWLIBC) && !defined(_WIN32)
+#ifndef errno
+#define errno    *_rt_errno()
+#endif
+#endif /* !defined(RT_USING_NEWLIBC) && !defined(_WIN32) */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/include/klibc/kstdio.h b/include/klibc/kstdio.h
new file mode 100644
index 0000000000..215e9a9245
--- /dev/null
+++ b/include/klibc/kstdio.h
@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) 2006-2024, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2024-09-22     Meco Man     the first version
+ */
+
+#ifndef __RT_KSTDIO_H__
+#define __RT_KSTDIO_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int rt_vsprintf(char *dest, const char *format, va_list arg_ptr);
+int rt_vsnprintf(char *buf, rt_size_t size, const char *fmt, va_list args);
+int rt_sprintf(char *buf, const char *format, ...);
+int rt_snprintf(char *buf, rt_size_t size, const char *format, ...);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/include/klibc/kstring.h b/include/klibc/kstring.h
new file mode 100644
index 0000000000..48fbe60091
--- /dev/null
+++ b/include/klibc/kstring.h
@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2006-2024, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2024-09-22     Meco Man     the first version
+ */
+
+#ifndef __RT_KSTRING_H__
+#define __RT_KSTRING_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void *rt_memset(void *src, int c, rt_ubase_t n);
+void *rt_memcpy(void *dest, const void *src, rt_ubase_t n);
+void *rt_memmove(void *dest, const void *src, rt_size_t n);
+rt_int32_t rt_memcmp(const void *cs, const void *ct, rt_size_t count);
+char *rt_strdup(const char *s);
+rt_size_t rt_strnlen(const char *s, rt_ubase_t maxlen);
+char *rt_strstr(const char *str1, const char *str2);
+rt_int32_t rt_strcasecmp(const char *a, const char *b);
+char *rt_strcpy(char *dst, const char *src);
+char *rt_strncpy(char *dest, const char *src, rt_size_t n);
+rt_int32_t rt_strncmp(const char *cs, const char *ct, rt_size_t count);
+rt_int32_t rt_strcmp(const char *cs, const char *ct);
+rt_size_t rt_strlen(const char *src);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/include/rtdef.h b/include/rtdef.h
index 6985bb8f51..17dbc329b0 100644
--- a/include/rtdef.h
+++ b/include/rtdef.h
@@ -84,12 +84,11 @@ extern "C" {
 #define RT_VERSION_PATCH                0               /**< Patch version number (x.x.X) */
 
 /* e.g. #if (RTTHREAD_VERSION >= RT_VERSION_CHECK(4, 1, 0) */
-#define RT_VERSION_CHECK(major, minor, revise)          ((major * 10000) + (minor * 100) + revise)
+#define RT_VERSION_CHECK(major, minor, revise)          ((major * 10000U) + (minor * 100U) + revise)
 
 /* RT-Thread version */
 #define RTTHREAD_VERSION                RT_VERSION_CHECK(RT_VERSION_MAJOR, RT_VERSION_MINOR, RT_VERSION_PATCH)
 
-
 /**@}*/
 
 /* maximum value of base type */
@@ -99,10 +98,10 @@ extern "C" {
 #define RT_UINT32_MAX                   UINT32_MAX      /**< Maximum number of UINT32 */
 #define RT_UINT64_MAX                   UINT64_MAX      /**< Maximum number of UINT64 */
 #else
-#define RT_UINT8_MAX                    0xff            /**< Maximum number of UINT8 */
-#define RT_UINT16_MAX                   0xffff          /**< Maximum number of UINT16 */
-#define RT_UINT32_MAX                   0xffffffff      /**< Maximum number of UINT32 */
-#define RT_UINT64_MAX                   0xffffffffffffffff
+#define RT_UINT8_MAX                    0xFFU                 /**< Maximum number of UINT8 */
+#define RT_UINT16_MAX                   0xFFFFU               /**< Maximum number of UINT16 */
+#define RT_UINT32_MAX                   0xFFFFFFFFUL          /**< Maximum number of UINT32 */
+#define RT_UINT64_MAX                   0xFFFFFFFFFFFFFFFFULL /**< Maximum number of UINT64 */
 #endif /* RT_USING_LIBC */
 
 #define RT_TICK_MAX                     RT_UINT32_MAX   /**< Maximum number of tick */
@@ -239,58 +238,6 @@ typedef int (*init_fn_t)(void);
 #endif /* RT_KERNEL_REALLOC */
 
 /**
- * @addtogroup Error
- */
-
-/**@{*/
-
-/* RT-Thread error code definitions */
-#if defined(RT_USING_LIBC) && !defined(RT_USING_NANO)
-/* POSIX error code compatible */
-#define RT_EOK                          0               /**< There is no error */
-#define RT_ERROR                        255             /**< A generic/unknown error happens */
-#define RT_ETIMEOUT                     ETIMEDOUT       /**< Timed out */
-#define RT_EFULL                        ENOSPC          /**< The resource is full */
-#define RT_EEMPTY                       ENODATA         /**< The resource is empty */
-#define RT_ENOMEM                       ENOMEM          /**< No memory */
-#define RT_ENOSYS                       ENOSYS          /**< Function not implemented */
-#define RT_EBUSY                        EBUSY           /**< Busy */
-#define RT_EIO                          EIO             /**< IO error */
-#define RT_EINTR                        EINTR           /**< Interrupted system call */
-#define RT_EINVAL                       EINVAL          /**< Invalid argument */
-#define RT_ENOENT                       ENOENT          /**< No entry */
-#define RT_ENOSPC                       ENOSPC          /**< No space left */
-#define RT_EPERM                        EPERM           /**< Operation not permitted */
-#define RT_EFAULT                       EFAULT          /**< Bad address */
-#define RT_ENOBUFS                      ENOBUFS         /**< No buffer space is available */
-#define RT_ESCHEDISR                    253             /**< scheduler failure in isr context */
-#define RT_ESCHEDLOCKED                 252             /**< scheduler failure in critical region */
-#define RT_ETRAP                        254             /**< Trap event */
-#else
-#define RT_EOK                          0               /**< There is no error */
-#define RT_ERROR                        1               /**< A generic/unknown error happens */
-#define RT_ETIMEOUT                     2               /**< Timed out */
-#define RT_EFULL                        3               /**< The resource is full */
-#define RT_EEMPTY                       4               /**< The resource is empty */
-#define RT_ENOMEM                       5               /**< No memory */
-#define RT_ENOSYS                       6               /**< Function not implemented */
-#define RT_EBUSY                        7               /**< Busy */
-#define RT_EIO                          8               /**< IO error */
-#define RT_EINTR                        9               /**< Interrupted system call */
-#define RT_EINVAL                       10              /**< Invalid argument */
-#define RT_ENOENT                       11              /**< No entry */
-#define RT_ENOSPC                       12              /**< No space left */
-#define RT_EPERM                        13              /**< Operation not permitted */
-#define RT_ETRAP                        14              /**< Trap event */
-#define RT_EFAULT                       15              /**< Bad address */
-#define RT_ENOBUFS                      16              /**< No buffer space is available */
-#define RT_ESCHEDISR                    17              /**< scheduler failure in isr context */
-#define RT_ESCHEDLOCKED                 18              /**< scheduler failure in critical region */
-#endif /* defined(RT_USING_LIBC) && !defined(RT_USING_NANO) */
-
-/**@}*/
-
-/**
  * @ingroup BasicDef
  *
  * @def RT_IS_ALIGN(addr, align)
diff --git a/include/rtklibc.h b/include/rtklibc.h
index 52fd8b9f1c..1577c20a6f 100644
--- a/include/rtklibc.h
+++ b/include/rtklibc.h
@@ -14,44 +14,8 @@
 #include <rtconfig.h>
 #include <rtdef.h>
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-/* kstdio */
-int rt_vsprintf(char *dest, const char *format, va_list arg_ptr);
-int rt_vsnprintf(char *buf, rt_size_t size, const char *fmt, va_list args);
-int rt_sprintf(char *buf, const char *format, ...);
-int rt_snprintf(char *buf, rt_size_t size, const char *format, ...);
-
-rt_err_t rt_get_errno(void);
-void rt_set_errno(rt_err_t no);
-int *_rt_errno(void);
-const char *rt_strerror(rt_err_t error);
-#if !defined(RT_USING_NEWLIBC) && !defined(_WIN32)
-#ifndef errno
-#define errno    *_rt_errno()
-#endif
-#endif /* !defined(RT_USING_NEWLIBC) && !defined(_WIN32) */
-
-/* kstring */
-
-void *rt_memset(void *src, int c, rt_ubase_t n);
-void *rt_memcpy(void *dest, const void *src, rt_ubase_t n);
-void *rt_memmove(void *dest, const void *src, rt_size_t n);
-rt_int32_t rt_memcmp(const void *cs, const void *ct, rt_size_t count);
-char *rt_strdup(const char *s);
-rt_size_t rt_strnlen(const char *s, rt_ubase_t maxlen);
-char *rt_strstr(const char *str1, const char *str2);
-rt_int32_t rt_strcasecmp(const char *a, const char *b);
-char *rt_strcpy(char *dst, const char *src);
-char *rt_strncpy(char *dest, const char *src, rt_size_t n);
-rt_int32_t rt_strncmp(const char *cs, const char *ct, rt_size_t count);
-rt_int32_t rt_strcmp(const char *cs, const char *ct);
-rt_size_t rt_strlen(const char *src);
-
-#ifdef __cplusplus
-}
-#endif
+#include "klibc/kstring.h"
+#include "klibc/kstdio.h"
+#include "klibc/kerrno.h"
 
 #endif /* __RT_KLIBC_H__ */
diff --git a/src/klibc/kerrno.c b/src/klibc/kerrno.c
new file mode 100644
index 0000000000..4d83b133cb
--- /dev/null
+++ b/src/klibc/kerrno.c
@@ -0,0 +1,169 @@
+/*
+ * Copyright (c) 2006-2024, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2024-09-22     Meco Man     the first version
+ */
+
+#include <rtthread.h>
+
+#define DBG_TAG           "kernel.errno"
+#ifdef RT_DEBUG_DEVICE
+#define DBG_LVL           DBG_LOG
+#else
+#define DBG_LVL           DBG_WARNING
+#endif /* defined (RT_DEBUG_DEVICE) */
+#include <rtdbg.h>
+
+/**
+ * @brief A global variable used to store the error code.
+ *
+ * This volatile static integer is used to store the most recent error code globally.
+ * Its volatile nature ensures that every read operation fetches the most current value,
+ * providing real-time error status across different parts of the program.
+ */
+static volatile int __rt_errno;
+
+/**
+ * @struct _errno_str_t
+ * @brief Structure for mapping error codes to corresponding error strings.
+ *
+ * This structure is used to create a mapping that associates an rt_err_t type error code
+ * with a corresponding error description string.
+ */
+struct _errno_str_t
+{
+    rt_err_t error;      /**< Error code of type rt_err_t, representing different kinds of errors. */
+    const char *str;     /**< Pointer to the error description string. */
+};
+
+/**
+ * @brief An array containing mappings of error codes to their corresponding error strings.
+ *
+ * This array uses the _errno_str_t structure to define several error codes and their
+ * corresponding error description strings. These mappings can be used at runtime
+ * to provide more readable error information.
+ */
+static struct _errno_str_t  rt_errno_strs[] =
+{
+    {RT_EOK     , "OK     "},  /**< Operation successful. */
+    {RT_ERROR   , "ERROR  "},  /**< General error. */
+    {RT_ETIMEOUT, "ETIMOUT"},  /**< Operation timed out. */
+    {RT_EFULL   , "ERSFULL"},  /**< Resource is full. */
+    {RT_EEMPTY  , "ERSEPTY"},  /**< Resource is empty. */
+    {RT_ENOMEM  , "ENOMEM "},  /**< Not enough memory. */
+    {RT_ENOSYS  , "ENOSYS "},  /**< Function not implemented. */
+    {RT_EBUSY   , "EBUSY  "},  /**< Resource is busy. */
+    {RT_EIO     , "EIO    "},  /**< Input/output error. */
+    {RT_EINTR   , "EINTRPT"},  /**< Interrupted system call. */
+    {RT_EINVAL  , "EINVAL "},  /**< Invalid argument. */
+    {RT_ENOENT  , "ENOENT "},  /**< No such file or directory. */
+    {RT_ENOSPC  , "ENOSPC "},  /**< No space left on device. */
+    {RT_EPERM   , "EPERM  "},  /**< Operation not permitted. */
+    {RT_ETRAP   , "ETRAP  "},  /**< Trap error. */
+};
+
+/**
+ * @brief This function return a pointer to a string that contains the
+ * message of error.
+ *
+ * @param error the errorno code
+ * @return a point to error message string
+ */
+const char *rt_strerror(rt_err_t error)
+{
+    int i = 0;
+
+    if (error < 0)
+        error = -error;
+
+    for (i = 0; i < sizeof(rt_errno_strs) / sizeof(rt_errno_strs[0]); i++)
+    {
+        if (rt_errno_strs[i].error == error)
+            return rt_errno_strs[i].str;
+    }
+
+    return "EUNKNOW";
+}
+RTM_EXPORT(rt_strerror);
+
+/**
+ * @brief This function gets the global errno for the current thread.
+ *
+ * @return errno
+ */
+rt_err_t rt_get_errno(void)
+{
+    rt_thread_t tid = RT_NULL;
+
+    if (rt_interrupt_get_nest() != 0)
+    {
+        /* it's in interrupt context */
+        return __rt_errno;
+    }
+
+    tid = rt_thread_self();
+    if (tid == RT_NULL)
+    {
+        return __rt_errno;
+    }
+
+    return tid->error;
+}
+RTM_EXPORT(rt_get_errno);
+
+/**
+ * @brief This function sets the global errno for the current thread.
+ *
+ * @param error is the errno shall be set.
+ */
+void rt_set_errno(rt_err_t error)
+{
+    rt_thread_t tid = RT_NULL;
+
+    if (rt_interrupt_get_nest() != 0)
+    {
+        /* it's in interrupt context */
+        __rt_errno = error;
+
+        return;
+    }
+
+    tid = rt_thread_self();
+    if (tid == RT_NULL)
+    {
+        __rt_errno = error;
+
+        return;
+    }
+
+    tid->error = error;
+}
+RTM_EXPORT(rt_set_errno);
+
+/**
+ * @brief This function returns the address of the current thread errno.
+ *
+ * @return The errno address.
+ */
+int *_rt_errno(void)
+{
+    rt_thread_t tid = RT_NULL;
+
+    if (rt_interrupt_get_nest() != 0)
+    {
+        return (int *)&__rt_errno;
+    }
+
+    tid = rt_thread_self();
+    if (tid != RT_NULL)
+    {
+        return (int *) & (tid->error);
+    }
+
+    return (int *)&__rt_errno;
+}
+RTM_EXPORT(_rt_errno);
diff --git a/src/klibc/kstdio.c b/src/klibc/kstdio.c
index 851b1008dd..4bcd5d460a 100644
--- a/src/klibc/kstdio.c
+++ b/src/klibc/kstdio.c
@@ -8,10 +8,7 @@
  * 2024-03-10     Meco Man     the first version
  */
 
-#include <rtdef.h>
-#include <rtcompiler.h>
-#include <rtklibc.h>
-#include <rtm.h>
+#include <rtthread.h>
 
 #define DBG_TAG           "kernel.stdio"
 #ifdef RT_DEBUG_DEVICE
@@ -684,155 +681,3 @@ int rt_sprintf(char *buf, const char *format, ...)
     return n;
 }
 RTM_EXPORT(rt_sprintf);
-
-/* errno functions */
-
-/**
- * @brief A global variable used to store the error code.
- *
- * This volatile static integer is used to store the most recent error code globally.
- * Its volatile nature ensures that every read operation fetches the most current value,
- * providing real-time error status across different parts of the program.
- */
-static volatile int __rt_errno;
-
-/**
- * @struct _errno_str_t
- * @brief Structure for mapping error codes to corresponding error strings.
- *
- * This structure is used to create a mapping that associates an rt_err_t type error code
- * with a corresponding error description string.
- */
-struct _errno_str_t
-{
-    rt_err_t error;      /**< Error code of type rt_err_t, representing different kinds of errors. */
-    const char *str;     /**< Pointer to the error description string. */
-};
-
-/**
- * @brief An array containing mappings of error codes to their corresponding error strings.
- *
- * This array uses the _errno_str_t structure to define several error codes and their
- * corresponding error description strings. These mappings can be used at runtime
- * to provide more readable error information.
- */
-static struct _errno_str_t  rt_errno_strs[] =
-{
-    {RT_EOK     , "OK     "},  /**< Operation successful. */
-    {RT_ERROR   , "ERROR  "},  /**< General error. */
-    {RT_ETIMEOUT, "ETIMOUT"},  /**< Operation timed out. */
-    {RT_EFULL   , "ERSFULL"},  /**< Resource is full. */
-    {RT_EEMPTY  , "ERSEPTY"},  /**< Resource is empty. */
-    {RT_ENOMEM  , "ENOMEM "},  /**< Not enough memory. */
-    {RT_ENOSYS  , "ENOSYS "},  /**< Function not implemented. */
-    {RT_EBUSY   , "EBUSY  "},  /**< Resource is busy. */
-    {RT_EIO     , "EIO    "},  /**< Input/output error. */
-    {RT_EINTR   , "EINTRPT"},  /**< Interrupted system call. */
-    {RT_EINVAL  , "EINVAL "},  /**< Invalid argument. */
-    {RT_ENOENT  , "ENOENT "},  /**< No such file or directory. */
-    {RT_ENOSPC  , "ENOSPC "},  /**< No space left on device. */
-    {RT_EPERM   , "EPERM  "},  /**< Operation not permitted. */
-    {RT_ETRAP   , "ETRAP  "},  /**< Trap error. */
-};
-
-/**
- * @brief This function return a pointer to a string that contains the
- * message of error.
- *
- * @param error the errorno code
- * @return a point to error message string
- */
-const char *rt_strerror(rt_err_t error)
-{
-    int i = 0;
-
-    if (error < 0)
-        error = -error;
-
-    for (i = 0; i < sizeof(rt_errno_strs) / sizeof(rt_errno_strs[0]); i++)
-    {
-        if (rt_errno_strs[i].error == error)
-            return rt_errno_strs[i].str;
-    }
-
-    return "EUNKNOW";
-}
-RTM_EXPORT(rt_strerror);
-
-/**
- * @brief This function gets the global errno for the current thread.
- *
- * @return errno
- */
-rt_err_t rt_get_errno(void)
-{
-    rt_thread_t tid = RT_NULL;
-
-    if (rt_interrupt_get_nest() != 0)
-    {
-        /* it's in interrupt context */
-        return __rt_errno;
-    }
-
-    tid = rt_thread_self();
-    if (tid == RT_NULL)
-    {
-        return __rt_errno;
-    }
-
-    return tid->error;
-}
-RTM_EXPORT(rt_get_errno);
-
-/**
- * @brief This function sets the global errno for the current thread.
- *
- * @param error is the errno shall be set.
- */
-void rt_set_errno(rt_err_t error)
-{
-    rt_thread_t tid = RT_NULL;
-
-    if (rt_interrupt_get_nest() != 0)
-    {
-        /* it's in interrupt context */
-        __rt_errno = error;
-
-        return;
-    }
-
-    tid = rt_thread_self();
-    if (tid == RT_NULL)
-    {
-        __rt_errno = error;
-
-        return;
-    }
-
-    tid->error = error;
-}
-RTM_EXPORT(rt_set_errno);
-
-/**
- * @brief This function returns the address of the current thread errno.
- *
- * @return The errno address.
- */
-int *_rt_errno(void)
-{
-    rt_thread_t tid = RT_NULL;
-
-    if (rt_interrupt_get_nest() != 0)
-    {
-        return (int *)&__rt_errno;
-    }
-
-    tid = rt_thread_self();
-    if (tid != RT_NULL)
-    {
-        return (int *) & (tid->error);
-    }
-
-    return (int *)&__rt_errno;
-}
-RTM_EXPORT(_rt_errno);
diff --git a/src/klibc/kstring.c b/src/klibc/kstring.c
index b3fb3b0029..562c3f7ccd 100644
--- a/src/klibc/kstring.c
+++ b/src/klibc/kstring.c
@@ -8,10 +8,7 @@
  * 2024-03-10     Meco Man     the first version
  */
 
-#include <rtdef.h>
-#include <rtcompiler.h>
-#include <rtklibc.h>
-#include <rtm.h>
+#include <rtthread.h>
 #ifdef RT_KLIBC_USING_STDLIB
 #include <string.h>
 #endif /* RT_KLIBC_USING_STDLIB */