errno: Rename get_errno_ptr to __errno

Inrease the compatiblity with the third party library(e.g. newlib)

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>

Documentation/NuttxUserGuide.html

@@ -10299,13 +10299,13 @@ OS resources. These hidden structures include:
 <p>
 <ul><pre>
 #include &lt;errno.h&gt;
-#define errno *get_errno_ptr()
+#define errno *__errno()
-int *get_errno_ptr(void);
+int *__errno(void);
 </pre></ul>
 <p>
   <b>Description</b>:
-  <code>get_errno_ptr()</code> returns a pointer to the thread-specific <code>errno</code> value.
+  <code>__errno()</code> returns a pointer to the thread-specific <code>errno</code> value.
-  Note that the symbol <code>errno</code> is defined to be <code>get_errno_ptr()</code> so that the usual
+  Note that the symbol <code>errno</code> is defined to be <code>__errno()</code> so that the usual
   access by referencing the symbol <code>errno</code> will work as expected.
 </p>
 <p>

boards/arm/lpc17xx_40xx/pnev5180b/src/lpc17_40_symtab.c

@@ -48,7 +48,6 @@ extern void *exit;
 extern void *fflush;
 extern void *fopen;
 extern void *fprintf;
-extern void *get_errno_ptr;
 extern void *getpid;
 extern void *kill;
 extern void *memset;
@@ -80,7 +79,6 @@ const struct symtab_s lpc17_40_exports[] =
   {"fflush", &fflush},
   {"fopen", &fopen},
   {"fprintf", &fprintf},
-  {"get_errno_ptr", &get_errno_ptr},
   {"getpid", &getpid},
   {"kill", &kill},
   {"memset", &memset},
@@ -107,4 +105,9 @@ const struct symtab_s lpc17_40_exports[] =
   {"usleep", &usleep},
 };
 
-const int lpc17_40_nexports = sizeof(lpc17_40_exports) / sizeof(struct symtab_s);
+const int lpc17_40_nexports =
+  sizeof(lpc17_40_exports) / sizeof(struct symtab_s);
+
+/*****************************************************************************
+ * Public Functions
+ *****************************************************************************/

include/errno.h

@@ -91,7 +91,7 @@
 
 #ifdef __DIRECT_ERRNO_ACCESS
 
-#  define errno *get_errno_ptr()
+#  define errno *__errno()
 #  define set_errno(e) do { errno = (int)(e); } while (0)
 #  define get_errno() errno
 
@@ -406,7 +406,7 @@ extern "C"
  * either as macros or via syscalls.
  */
 
-FAR int *get_errno_ptr(void);
+FAR int *__errno(void);
 
 #ifndef __DIRECT_ERRNO_ACCESS
 void set_errno(int errcode);

libs/libc/libc.csv

@@ -1,3 +1,4 @@
+"__errno","errno.h","defined(CONFIG_BUILD_FLAT)","FAR int *"
 "abort","stdlib.h","","void"
 "abs","stdlib.h","","int","int"
 "aio_error","aio.h","defined(CONFIG_FS_AIO)","int","FAR struct aiocb *"
@@ -47,7 +48,6 @@
 "fsetpos","stdio.h","CONFIG_NFILE_STREAMS > 0","int","FAR FILE *","FAR fpos_t *"
 "ftell","stdio.h","CONFIG_NFILE_STREAMS > 0","long","FAR FILE *"
 "fwrite","stdio.h","CONFIG_NFILE_STREAMS > 0","size_t","FAR const void *","size_t","size_t","FAR FILE *"
-"get_errno_ptr","errno.h","defined(CONFIG_BUILD_FLAT)","FAR int *"
 "getcwd","unistd.h","!defined(CONFIG_DISABLE_ENVIRON)","FAR char","FAR char *","size_t"
 "gethostname","unistd.h","","int","FAR char*","size_t"
 "getopt","unistd.h","","int","int","FAR char *const[]","FAR const char *"

sched/errno/Make.defs

@@ -33,7 +33,7 @@
 #
 ############################################################################
 
-CSRCS += errno_getptr.c
+CSRCS += errno_errno.c
 
 ifeq ($(CONFIG_LIB_SYSCALL),y)
 CSRCS += errno_get.c errno_set.c

sched/errno/errno_errno.c

@@ -1,5 +1,5 @@
 /****************************************************************************
- * sched/errno/errno_getptr.c
+ * sched/errno/errno_errno.c
  *
  *   Copyright (C) 2007, 2008, 2011, 2014 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
@@ -43,19 +43,12 @@
 #include <nuttx/arch.h>
 #include "sched/sched.h"
 
-/****************************************************************************
- * Pre-processor Definitions
- ****************************************************************************/
-
-#undef get_errno_ptr
-#undef errno
-
 /****************************************************************************
  * Private Data
  ****************************************************************************/
 
 /* This is a 'dummy' errno value to use in context where there is no valid
- * errno location to use.  For example, when running from an interrupt handler
+ * errno location to use. For example, when running from an interrupt handler
  * or early in initialization when task structures have not yet been
  * initialized.
  */
@@ -67,7 +60,7 @@ static int g_irqerrno;
  ****************************************************************************/
 
 /****************************************************************************
- * Name: get_errno_ptr
+ * Name: __errno
  *
  * Description:
  *   Return a pointer to the thread specific errno.
@@ -82,7 +75,7 @@ static int g_irqerrno;
  *
  ****************************************************************************/
 
-FAR int *get_errno_ptr(void)
+FAR int *__errno(void)
 {
   /* Check if this function was called from an interrupt handler.  In that
    * case, we have to do things a little differently to prevent the interrupt
@@ -113,12 +106,12 @@ FAR int *get_errno_ptr(void)
     }
 
   /* We were called either from (1) an interrupt handler or (2) from normally
-   * code but in an unhealthy state.  In either event, do not permit access to
+   * code but in an unhealthy state. In either event, do not permit access to
    * the errno in the TCB of the task at the head of the ready-to-run list.
-   * Instead, use a separate errno just for interrupt handlers.  Of course, this
+   * Instead, use a separate errno just for interrupt handlers.  Of course,
-   * would have to change if we ever wanted to support nested interrupts or if
+   * this would have to change if we ever wanted to support nested interrupts
-   * we really cared about the stability of the errno during those "unhealthy
+   * or if we really cared about the stability of the errno during those
-   * states."
+   * "unhealthy states."
    */
 
   return &g_irqerrno;

sched/errno/errno_get.c

@@ -45,9 +45,7 @@
  * Pre-processor Definitions
  ****************************************************************************/
 
-#undef get_errno_ptr
 #undef get_errno
-#undef errno
 
 /****************************************************************************
  * Public Functions
@@ -74,5 +72,5 @@
 
 int get_errno(void)
 {
-  return *get_errno_ptr();
+  return *__errno();
 }

sched/errno/errno_set.c

@@ -45,9 +45,7 @@
  * Pre-processor Definitions
  ****************************************************************************/
 
-#undef get_errno_ptr
 #undef set_errno
-#undef errno
 
 /****************************************************************************
  * Public Functions
@@ -62,7 +60,7 @@
  *   thread-specific errno value.
  *
  * Input Parameters:
- *   errcode - The thread specific errno will be set to this error code value.
+ *   errcode - The thread specific errno will be set to this value.
  *
  * Returned Value:
  *   None
@@ -73,5 +71,5 @@
 
 void set_errno(int errcode)
 {
-  *get_errno_ptr() = errcode;
+  *__errno() = errcode;
 }

sched/task/task_exit.c

@@ -129,7 +129,7 @@ int nxtask_exit(void)
   /* We are now in a bad state -- the head of the ready to run task list
    * does not correspond to the thread that is running.  Disabling pre-
    * emption on this TCB and marking the new ready-to-run task as not
-   * running (see, for example, get_errno_ptr()).
+   * running.
    *
    * We disable pre-emption here by directly incrementing the lockcount
    * (vs. calling sched_lock()).

syscall/syscall.csv

@@ -30,7 +30,6 @@
 "fsync","unistd.h","!defined(CONFIG_DISABLE_MOUNTPOINT)","int","int"
 "ftruncate","unistd.h","!defined(CONFIG_DISABLE_MOUNTPOINT)","int","int","off_t"
 "get_errno","errno.h","!defined(__DIRECT_ERRNO_ACCESS)","int"
-"get_errno_ptr","errno.h","defined(__DIRECT_ERRNO_ACCESS)","FAR int*"
 "getenv","stdlib.h","!defined(CONFIG_DISABLE_ENVIRON)","FAR char*","FAR const char*"
 "getgid","unistd.h","defined(CONFIG_SCHED_USER_IDENTITY)","gid_t"
 "getitimer","sys/time.h","!defined(CONFIG_DISABLE_POSIX_TIMERS)","int","int","FAR struct itimerval *"