diff options
Diffstat (limited to 'nuttx/include')
| -rw-r--r-- | nuttx/include/errno.h | 31 |
1 files changed, 28 insertions, 3 deletions
diff --git a/nuttx/include/errno.h b/nuttx/include/errno.h index 09c9690b6..d0c80975a 100644 --- a/nuttx/include/errno.h +++ b/nuttx/include/errno.h @@ -46,13 +46,38 @@ * Definitions ************************************************************************/ -/* Convenience/compatibility definition */ +/* Convenience/compatibility definition. + * + * For a flat, all kernel-mode build, the error can be read and written + * from all code using a simple pointer. + */ -#define errno *get_errno_ptr() #ifndef CONFIG_NUTTX_KERNEL + +# define errno *get_errno_ptr() # define set_errno(e) do { errno = (int)(e); } while (0) # define get_errno(e) errno -#endif + +#else + +/* 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 + * read and written using a pointer. + */ + +#ifdef __KERNEL__ +# define errno *get_errno_ptr() +#else + +/* 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- + * mode code in order to set the errno value. + */ + +# define errno get_errno() + +#endif /* __KERNEL__ */ +#endif /* CONFIG_NUTTX_KERNEL */ /* Definitions of error numbers and the string that would be * returned by strerror(). |