Re: [lwip-users] [lwip] Why value of O_NONBLOCK/O_RDONLY/O_WRONLY/O_RDWR in src/include/lwip/sockets.h are not equal to the posix?

[address@hidden]

Am 05.03.2021 um 06:18 schrieb Ajay Bhargav via lwip-users:
> If you’re using a posix style system of any system which already define
> O_RDONLY/WRONLY/RDWR then you can include that file in your arch.h or
> cc.h probably
>
>  
>
> The sockets.h definition is only for the system which does not define
> anything. So it does not matter what the values are.

While it probably should be like that, the values cited below do not
work: the lwIP code currently relies on "O_RDWR == (O_RDONLY|O_WRONLY)"
and on none of them being zero...

Regards,
Simon

>
>  
>
> Regards,
>
> Ajay Bhargav
>
>  
>
>  
>
> *From: *唐尧 <mailto:tangyao@cmiot.chinamobile.com>
> *Sent: *Friday, March 5, 2021 9:35 AM
> *To: *lwip-users <mailto:lwip-users@nongnu.org>
> *Cc: *jlledom <mailto:jlledom@member.fsf.org>
> *Subject: *[lwip-users] [lwip] Why value of
> O_NONBLOCK/O_RDONLY/O_WRONLY/O_RDWR in src/include/lwip/sockets.h are
> not equal to the posix?
>
>  
>
> *In posix fcntl.h , the definations is:*
>
>  
>
> #define O_RDONLY     00000000
>
> #define O_WRONLY    00000001
>
> #define O_RDWR        00000002
>
>  
>
> *but in src/include/lwip/sockets.h , the value is:*
>
>  
>
> #ifndef O_NONBLOCK
>
> #define O_NONBLOCK  1 /* nonblocking I/O */
>
> #endif
>
> #ifndef O_NDELAY
>
> #define O_NDELAY    O_NONBLOCK /* same as O_NONBLOCK, for compatibility */
>
> #endif
>
> #ifndef O_RDONLY
>
> #define O_RDONLY    2
>
> #endif
>
> #ifndef O_WRONLY
>
> #define O_WRONLY    4
>
> #endif
>
> #ifndef O_RDWR
>
> #define O_RDWR      (O_RDONLY|O_WRONLY)
>
> #endif
>
>  
>
> *any reason of the difference?*
>
>  
>
>  
>
> BRs//tangyao
>
>  
>
>
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