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errno must be handled in a special way if there are external modules

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This commit is contained in:
Gregory Nutt
2014-08-28 17:01:57 -06:00
parent 89593969be
commit 42e0c5329d
1 changed files with 13 additions and 6 deletions
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include/errno.h
+13 -6
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@@ -52,7 +52,7 @@
* from all code using a simple pointer. * from all code using a simple pointer.
*/ */
#ifndef CONFIG_NUTTX_KERNEL #ifndef CONFIG_LIB_SYSCALL
# define errno *get_errno_ptr() # define errno *get_errno_ptr()
# define set_errno(e) do { errno = (int)(e); } while (0) # define set_errno(e) do { errno = (int)(e); } while (0)
@@ -62,22 +62,29 @@
/* We doing separate user-/kernel-mode builds, then the errno has to be /* We doing separate user-/kernel-mode builds, then the errno has to be
* a little differently. In kernel-mode, the TCB errno value can still be * a little differently. In kernel-mode, the TCB errno value can still be
* read and written using a pointer. * read and written using a pointer from code executing within the
* kernel.
*/ */
#ifdef __KERNEL__ #if defined(CONFIG_NUTTX_KERNEL) && defined(__KERNEL__)
# define errno *get_errno_ptr() # define errno *get_errno_ptr()
# define set_errno(e) do { errno = (int)(e); } while (0)
# define get_errno(e) errno
#else #else
/* But in user-mode, the errno can only be read using the name 'errno'. /* But in user-mode, the errno can only be read using the name 'errno'.
* The non-standard API set_errno() must be explicity be used from user- * The non-standard API set_errno() must explicitly be used from user-
* mode code in order to set the errno value. * mode code in order to set the errno value.
*
* The same is true of the case where we have syscalls enabled but this
* is not a kernel build, then we really have no option but to use the
* set_errno() accessor function explicitly, even from OS logic!
*/ */
# define errno get_errno() # define errno get_errno()
#endif /* __KERNEL__ */ #endif /* __KERNEL__ */
#endif /* CONFIG_NUTTX_KERNEL */ #endif /* CONFIG_LIB_SYSCALL */
/* Definitions of error numbers and the string that would be /* Definitions of error numbers and the string that would be
* returned by strerror(). * returned by strerror().
@@ -357,7 +364,7 @@ extern "C"
FAR int *get_errno_ptr(void); FAR int *get_errno_ptr(void);
#ifdef CONFIG_NUTTX_KERNEL #ifdef CONFIG_LIB_SYSCALL
void set_errno(int errcode); void set_errno(int errcode);
int get_errno(void); int get_errno(void);
#endif #endif