On 4/12/2013 10:51 PM, Steven D'Aprano wrote:
> And two examples from asm-generic/errno.h:
>> #define EWOULDBLOCK EAGAIN /* Operation would block */
> #define EDEADLOCK EDEADLK
>
That's actually even better of an example than you may have realized
because historically EWOULDBLOCK != EAGAIN[1]. So, there very well may
need to exist such code as:
if <some hairy platform>:
_EAGAIN = <X>
_EWOULDBLOCK = <Y>
else:
_EAGAIN = _EWOULDBLOCK = <X>
class Errno(Enum):
EAGAIN = _EAGAIN
EWOULDBLOCK = _EWOULDBLOCK
I don't think it's all that uncommon that enum values that represent
states of a system get merged or renamed over time, and this one is a
great example of that.
[1]
http://www.gnu.org/savannah-checkouts/gnu/libc/manual/html_node/Error-Codes.html#index-EAGAIN-97
--
Scott Dial
scott at scottdial.com
