pdp11v/usr/include/fcntl.h

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/*	@(#)fcntl.h	1.1	*/
/*	3.0 SID #	1.2	*/
/* Flag values accessible to open(2) and fcntl(2) */
/*  (The first three can only be set by open) */
#define	O_RDONLY 0
#define	O_WRONLY 1
#define	O_RDWR	 2
#define	O_NDELAY 04	/* Non-blocking I/O */
#define	O_APPEND 010	/* append (writes guaranteed at the end) */

/* Flag values accessible only to open(2) */
#define	O_CREAT	00400	/* open with file create (uses third open arg)*/
#define	O_TRUNC	01000	/* open with truncation */
#define	O_EXCL	02000	/* exclusive open */

/* fcntl(2) requests */
#define	F_DUPFD	0	/* Duplicate fildes */
#define	F_GETFD	1	/* Get fildes flags */
#define	F_SETFD	2	/* Set fildes flags */
#define	F_GETFL	3	/* Get file flags */
#define	F_SETFL	4	/* Set file flags */