fcntl.h

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#pragma once
 
#define O_ACCMODE   0003      
#define O_RDONLY    00000000U 
#define O_WRONLY    00000001U 
#define O_RDWR      00000002U 
#define O_CREAT     00000100U 
#define O_EXCL      00000200U 
#define O_TRUNC     00001000U 
#define O_APPEND    00002000U 
#define O_NONBLOCK  00004000U 
#define O_DIRECTORY 00200000U