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?

[Ajay Bhargav]

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.

 

Regards,

Ajay Bhargav

 

 

From: 唐尧
Sent: Friday, March 5, 2021 9:35 AM
To: lwip-users
Cc: jlledom
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