[kernel] move errno functions into klibc

include/rtklibc.h

@@ -25,6 +25,16 @@ 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 */
 
 #ifndef RT_KSERVICE_USING_STDLIB_MEMORY

include/rtthread.h

@@ -728,16 +728,6 @@ rt_device_t rt_console_get_device(void);
 #endif /* RT_USING_THREADSAFE_PRINTF */
 #endif /* defined(RT_USING_DEVICE) && defined(RT_USING_CONSOLE) */
 
-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) */
-
 int __rt_ffs(int value);
 
 void rt_show_version(void);

src/klibc/kstdio.c

@@ -21,7 +21,6 @@
 #endif /* defined (RT_DEBUG_DEVICE) */
 #include <rtdbg.h>
 
-/* private function */
 #define _ISDIGIT(c)  ((unsigned)((c) - '0') < 10)
 
 /**
@@ -684,3 +683,155 @@ 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);

src/kservice.c

@@ -54,9 +54,6 @@
  * @{
  */
 
-/* global errno in RT-Thread */
-static volatile int __rt_errno;
-
 #if defined(RT_USING_DEVICE) && defined(RT_USING_CONSOLE)
 static rt_device_t _console_device = RT_NULL;
 #endif
@@ -112,133 +109,6 @@ rt_weak const char *rt_hw_cpu_arch(void)
     return "unknown";
 }
 
-struct _errno_str_t
-{
-    rt_err_t error;
-    const char *str;
-};
-
-static struct _errno_str_t  rt_errno_strs[] =
-{
-    {RT_EOK     , "OK     "},
-    {RT_ERROR   , "ERROR  "},
-    {RT_ETIMEOUT, "ETIMOUT"},
-    {RT_EFULL   , "ERSFULL"},
-    {RT_EEMPTY  , "ERSEPTY"},
-    {RT_ENOMEM  , "ENOMEM "},
-    {RT_ENOSYS  , "ENOSYS "},
-    {RT_EBUSY   , "EBUSY  "},
-    {RT_EIO     , "EIO    "},
-    {RT_EINTR   , "EINTRPT"},
-    {RT_EINVAL  , "EINVAL "},
-    {RT_ENOENT  , "ENOENT "},
-    {RT_ENOSPC  , "ENOSPC "},
-    {RT_EPERM   , "EPERM  "},
-    {RT_ETRAP   , "ETRAP  "},
-};
-
-/**
- * @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);
-
 /**
  * @brief This function will show the version of rt-thread rtos
  */