[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?

[唐尧]

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