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   1 /*-
   2  * Copyright (c) 1983, 1990, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  * (c) UNIX System Laboratories, Inc.
   5  * All or some portions of this file are derived from material licensed
   6  * to the University of California by American Telephone and Telegraph
   7  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
   8  * the permission of UNIX System Laboratories, Inc.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  *      @(#)fcntl.h     8.3 (Berkeley) 1/21/94
  35  */
  37 #ifndef _SYS_FCNTL_H_
  38 #define _SYS_FCNTL_H_
  40 /*
  41  * This file includes the definitions for open and fcntl
  42  * described by POSIX for <fcntl.h>.
  43  */
  45 #include <sys/types.h>
  47 /*
  48  * File status flags: these are used by open(2), fcntl(2).
  49  * They are also used (indirectly) in the kernel file structure f_flags,
  50  * which is a superset of the open/fcntl flags.  Open flags and f_flags
  51  * are inter-convertible using OFLAGS(fflags) and FFLAGS(oflags).
  52  * Open/fcntl flags begin with O_; kernel-internal flags begin with F.
  53  */
  54 /* open-only flags */
  55 #define O_RDONLY        0x00000000      /* open for reading only */
  56 #define O_WRONLY        0x00000001      /* open for writing only */
  57 #define O_RDWR          0x00000002      /* open for reading and writing */
  58 #define O_ACCMODE       0x00000003      /* mask for above modes */
  60 /*
  61  * Kernel encoding of open mode; separate read and write bits that are
  62  * independently testable: 1 greater than the above.
  63  */
  64 #define FREAD           0x00000001
  65 #define FWRITE          0x00000002
  67 #define O_NONBLOCK      0x00000004      /* no delay */
  68 #define O_APPEND        0x00000008      /* set append mode */
  69 #define O_SHLOCK        0x00000010      /* open with shared file lock */
  70 #define O_EXLOCK        0x00000020      /* open with exclusive file lock */
  71 #define O_ASYNC         0x00000040      /* signal pgrp when data ready */
  72 #define O_SYNC          0x00000080      /* synchronous writes */
  73 #define O_CREAT         0x00000200      /* create if nonexistent */
  74 #define O_TRUNC         0x00000400      /* truncate to zero length */
  75 #define O_EXCL          0x00000800      /* error if already exists */
  77 #define FPIPE           0x00010000      /* pipe */
  79 /* defined by POSIX 1003.1; BSD default, so no bit required */
  80 #define O_NOCTTY        0               /* don't assign controlling terminal */
  82 /* convert from open() flags to/from fflags; convert O_RD/WR to FREAD/FWRITE */
  83 #define FFLAGS(oflags)  ((oflags) + 1)
  84 #define OFLAGS(fflags)  ((fflags) - 1)
  86 /*
  87  * Constants used for fcntl(2)
  88  */
  90 /* command values */
  91 #define F_DUPFD         0               /* duplicate file descriptor */
  92 #define F_GETFD         1               /* get file descriptor flags */
  93 #define F_SETFD         2               /* set file descriptor flags */
  94 #define F_GETFL         3               /* get file status flags */
  95 #define F_SETFL         4               /* set file status flags */
  96 #define F_GETOWN        5               /* get SIGIO/SIGURG proc/pgrp */
  97 #define F_SETOWN        6               /* set SIGIO/SIGURG proc/pgrp */
  98 #define F_GETLK         7               /* get record locking information */
  99 #define F_SETLK         8               /* set record locking information */
 100 #define F_SETLKW        9               /* F_SETLK; wait if blocked */
 102 /* file descriptor flags (F_GETFD, F_SETFD) */
 103 #define FD_CLOEXEC      1               /* close-on-exec flag */
 105 /* record locking flags (F_GETLK, F_SETLK, F_SETLKW) */
 106 #define F_RDLCK         1               /* shared or read lock */
 107 #define F_UNLCK         2               /* unlock */
 108 #define F_WRLCK         3               /* exclusive or write lock */
 110 /*
 111  * Advisory file segment locking data type -
 112  * information passed to system by user
 113  */
 114 struct flock {
off_t   l_start;        /* starting offset */
off_t   l_len;          /* len = 0 means until end of file */
pid_t   l_pid;          /* lock owner */
 118         short   l_type;         /* lock type: read/write, etc. */
 119         short   l_whence;       /* type of l_start */
 120 };
 122 /* lock operations for flock(2) */
 123 #define LOCK_SH         0x01            /* shared file lock */
 124 #define LOCK_EX         0x02            /* exclusive file lock */
 125 #define LOCK_NB         0x04            /* don't block when locking */
 126 #define LOCK_UN         0x08            /* unlock file */
 129 #include <sys/cdefs.h>
__BEGIN_DECLS
 132 int     open(const char *, int, ...);
 133 int     creat(const char *, mode_t);
 134 int     fcntl(int, int, ...);
 135 #if 0
 136 int     flock(int, int);
 137 #endif
__END_DECLS
 140 #endif /* !_SYS_FCNTL_H_ */