#ifndef _FCNTL_H#define _FCNTL_H #include <sys/types.h>  // File access modes#define O_ACCMODE	0x03	// Mask for file access modes.#define O_RDONLY	0x00	// Open for reading only.#define O_WRONLY	0x01	// Open for writing only. #define O_RDWR		0x02	// Open for reading and writing. // File creation flags#define O_CREAT		0x10	// Create file if it does not exist.#define O_EXCL		0x20	// Exclusive use flag.#define O_NOCTTY	0x40	// Do not assign controlling terminal.#define O_TRUNC		0x80	// Truncate flag.  // File access flags#define O_APPEND	0x100	// Set append mode.#define O_NONBLOCK	0x200	// Non-blocking mode.#define O_SYNC		0x400	// Synchronous I/O. // Fcntl args#define	F_DUPFD		0#define	F_GETFD		1#define	F_SETFD		2#define	F_GETFL		3#define	F_SETFL		4// #define	F_GETLK		7// #define	F_SETLK		8// #define	F_SETLKW	9 #define	FD_CLOEXEC	1   int creat(const char *path, mode_t mode);int fcntl(int fd, int cmd, ...);int open(const char *path, int flags, ...);  #endif	// _FCNTL_H