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/* @(#)fcntl.h 1.3 86/07/16 SMI; from UCB 5.1 85/05/30 */
/*
* Copyright (c) 1983 Regents of the University of California.
* All rights reserved. The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
*/
#ifndef __FCNTL_HEADER__
#define __FCNTL_HEADER__
/*
* 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 FNDELAY /* Non-blocking I/O */
#define O_APPEND FAPPEND /* append (writes guaranteed at the end) */
#define O_CREAT FCREAT /* open with file create */
#define O_TRUNC FTRUNC /* open with truncation */
#define O_EXCL FEXCL /* error on create if file exists */
/* flags for F_GETFL, F_SETFL-- needed by <sys/file.h> */
#define FNDELAY 00004 /* non-blocking reads */
#define FAPPEND 00010 /* append on each write */
#define FASYNC 00100 /* signal pgrp when data ready */
#define FCREAT 01000 /* create if nonexistant */
#define FTRUNC 02000 /* truncate to zero length */
#define FEXCL 04000 /* error if already created */
/* 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 */
#define F_GETOWN 5 /* Get owner */
#define F_SETOWN 6 /* Set owner */
#define F_GETLK 7 /* Get record-locking information */
#define F_SETLK 8 /* Set or Clear a record-lock (Non-Blocking) */
#define F_SETLKW 9 /* Set or Clear a record-lock (Blocking) */
/* access(2) requests */
#define F_OK 0 /* does file exist */
#define X_OK 1 /* is it executable by caller */
#define W_OK 2 /* writable by caller */
#define R_OK 4 /* readable by caller */
/* System-V record-locking options */
/* lockf(2) requests */
#define F_ULOCK 0 /* Unlock a previously locked region */
#define F_LOCK 1 /* Lock a region for exclusive use */
#define F_TLOCK 2 /* Test and lock a region for exclusive use */
#define F_TEST 3 /* Test a region for other processes locks */
/* fcntl(2) flags (l_type field of flock structure) */
#define F_RDLCK 1 /* read lock */
#define F_WRLCK 2 /* write lock */
#define F_UNLCK 3 /* remove lock(s) */
/* file segment locking set data type - information passed to system by user */
struct flock {
short l_type; /* F_RDLCK, F_WRLCK, or F_UNLCK */
short l_whence; /* flag to choose starting offset */
long l_start; /* relative offset, in bytes */
long l_len; /* length, in bytes; 0 means lock to EOF */
short l_pid; /* returned with F_GETLK */
short l_xxx; /* reserved for future use */
};
#endif !__FCNTL_HEADER__
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