The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/fcntl.h

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    1 /*      $NetBSD: fcntl.h,v 1.28 2004/01/05 00:35:53 christos Exp $      */
    2 
    3 /*-
    4  * Copyright (c) 1983, 1990, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  * (c) UNIX System Laboratories, Inc.
    7  * All or some portions of this file are derived from material licensed
    8  * to the University of California by American Telephone and Telegraph
    9  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
   10  * the permission of UNIX System Laboratories, Inc.
   11  *
   12  * Redistribution and use in source and binary forms, with or without
   13  * modification, are permitted provided that the following conditions
   14  * are met:
   15  * 1. Redistributions of source code must retain the above copyright
   16  *    notice, this list of conditions and the following disclaimer.
   17  * 2. Redistributions in binary form must reproduce the above copyright
   18  *    notice, this list of conditions and the following disclaimer in the
   19  *    documentation and/or other materials provided with the distribution.
   20  * 3. Neither the name of the University nor the names of its contributors
   21  *    may be used to endorse or promote products derived from this software
   22  *    without specific prior written permission.
   23  *
   24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   34  * SUCH DAMAGE.
   35  *
   36  *      @(#)fcntl.h     8.3 (Berkeley) 1/21/94
   37  */
   38 
   39 #ifndef _SYS_FCNTL_H_
   40 #define _SYS_FCNTL_H_
   41 
   42 /*
   43  * This file includes the definitions for open and fcntl
   44  * described by POSIX for <fcntl.h>; it also includes
   45  * related kernel definitions.
   46  */
   47 
   48 #ifndef _KERNEL
   49 #include <sys/featuretest.h>
   50 #include <sys/types.h>
   51 #if defined(_XOPEN_SOURCE) || defined(_NETBSD_SOURCE)
   52 #include <sys/stat.h>
   53 #endif /* _XOPEN_SOURCE || _NETBSD_SOURCE */
   54 #endif /* !_KERNEL */
   55 
   56 /*
   57  * File status flags: these are used by open(2), fcntl(2).
   58  * They are also used (indirectly) in the kernel file structure f_flags,
   59  * which is a superset of the open/fcntl flags.  Open flags and f_flags
   60  * are inter-convertible using OFLAGS(fflags) and FFLAGS(oflags).
   61  * Open/fcntl flags begin with O_; kernel-internal flags begin with F.
   62  */
   63 /* open-only flags */
   64 #define O_RDONLY        0x00000000      /* open for reading only */
   65 #define O_WRONLY        0x00000001      /* open for writing only */
   66 #define O_RDWR          0x00000002      /* open for reading and writing */
   67 #define O_ACCMODE       0x00000003      /* mask for above modes */
   68 
   69 /*
   70  * Kernel encoding of open mode; separate read and write bits that are
   71  * independently testable: 1 greater than the above.
   72  *
   73  * XXX
   74  * FREAD and FWRITE are excluded from the #ifdef _KERNEL so that TIOCFLUSH,
   75  * which was documented to use FREAD/FWRITE, continues to work.
   76  */
   77 #if defined(_NETBSD_SOURCE)
   78 #define FREAD           0x00000001
   79 #define FWRITE          0x00000002
   80 #endif
   81 #define O_NONBLOCK      0x00000004      /* no delay */
   82 #define O_APPEND        0x00000008      /* set append mode */
   83 #if defined(_NETBSD_SOURCE)
   84 #define O_SHLOCK        0x00000010      /* open with shared file lock */
   85 #define O_EXLOCK        0x00000020      /* open with exclusive file lock */
   86 #define O_ASYNC         0x00000040      /* signal pgrp when data ready */
   87 #endif
   88 #if (_POSIX_C_SOURCE - 0) >= 199309L || \
   89     (defined(_XOPEN_SOURCE) && defined(_XOPEN_SOURCE_EXTENDED)) || \
   90     (_XOPEN_SOURCE - 0) >= 500 || defined(_NETBSD_SOURCE)
   91 #define O_SYNC          0x00000080      /* synchronous writes */
   92 #endif
   93 #if defined(_NETBSD_SOURCE)
   94 #define O_NOFOLLOW      0x00000100      /* don't follow symlinks on the last */
   95                                         /* path component */
   96 #endif
   97 #define O_CREAT         0x00000200      /* create if nonexistent */
   98 #define O_TRUNC         0x00000400      /* truncate to zero length */
   99 #define O_EXCL          0x00000800      /* error if already exists */
  100 
  101 #if (_POSIX_C_SOURCE - 0) >= 199309L || (_XOPEN_SOURCE - 0) >= 500 || \
  102     defined(_NETBSD_SOURCE)
  103 #define O_DSYNC         0x00010000      /* write: I/O data completion */
  104 #define O_RSYNC         0x00020000      /* read: I/O completion as for write */
  105 #endif
  106 
  107 #if defined(_NETBSD_SOURCE)
  108 #define O_ALT_IO        0x00040000      /* use alternate i/o semantics */
  109 #endif
  110 
  111 /* defined by POSIX 1003.1; BSD default, but required to be bitwise distinct */
  112 #define O_NOCTTY        0x00008000      /* don't assign controlling terminal */
  113 
  114 #ifdef _KERNEL
  115 /* convert from open() flags to/from fflags; convert O_RD/WR to FREAD/FWRITE */
  116 #define FFLAGS(oflags)  ((oflags) + 1)
  117 #define OFLAGS(fflags)  ((fflags) - 1)
  118 
  119 /* all bits settable during open(2) */
  120 #define O_MASK          (O_ACCMODE|O_NONBLOCK|O_APPEND|O_SHLOCK|O_EXLOCK|\
  121                          O_ASYNC|O_SYNC|O_CREAT|O_TRUNC|O_EXCL|O_DSYNC|\
  122                          O_RSYNC|O_NOCTTY|O_ALT_IO|O_NOFOLLOW)
  123 
  124 #define FMARK           0x00001000      /* mark during gc() */
  125 #define FDEFER          0x00002000      /* defer for next gc pass */
  126 #define FHASLOCK        0x00004000      /* descriptor holds advisory lock */
  127 /* bits to save after open(2) */
  128 #define FMASK           (FREAD|FWRITE|FAPPEND|FASYNC|FFSYNC|FNONBLOCK|FDSYNC|\
  129                          FRSYNC|FALTIO)
  130 /* bits settable by fcntl(F_SETFL, ...) */
  131 #define FCNTLFLAGS      (FAPPEND|FASYNC|FFSYNC|FNONBLOCK|FDSYNC|FRSYNC|FALTIO)
  132 #endif /* _KERNEL */
  133 
  134 /*
  135  * The O_* flags used to have only F* names, which were used in the kernel
  136  * and by fcntl.  We retain the F* names for the kernel f_flags field
  137  * and for backward compatibility for fcntl.
  138  */
  139 #if defined(_NETBSD_SOURCE)
  140 #define FAPPEND         O_APPEND        /* kernel/compat */
  141 #define FASYNC          O_ASYNC         /* kernel/compat */
  142 #define O_FSYNC         O_SYNC          /* compat */
  143 #define FNDELAY         O_NONBLOCK      /* compat */
  144 #define O_NDELAY        O_NONBLOCK      /* compat */
  145 #endif
  146 #if defined(_KERNEL)
  147 #define FNONBLOCK       O_NONBLOCK      /* kernel */
  148 #define FFSYNC          O_SYNC          /* kernel */
  149 #define FDSYNC          O_DSYNC         /* kernel */
  150 #define FRSYNC          O_RSYNC         /* kernel */
  151 #define FALTIO          O_ALT_IO        /* kernel */
  152 #endif
  153 
  154 /*
  155  * Constants used for fcntl(2)
  156  */
  157 
  158 /* command values */
  159 #define F_DUPFD         0               /* duplicate file descriptor */
  160 #define F_GETFD         1               /* get file descriptor flags */
  161 #define F_SETFD         2               /* set file descriptor flags */
  162 #define F_GETFL         3               /* get file status flags */
  163 #define F_SETFL         4               /* set file status flags */
  164 #if (_POSIX_C_SOURCE - 0) >= 200112L || (_XOPEN_SOURCE - 0) >= 500 || \
  165     defined(_NETBSD_SOURCE)
  166 #define F_GETOWN        5               /* get SIGIO/SIGURG proc/pgrp */
  167 #define F_SETOWN        6               /* set SIGIO/SIGURG proc/pgrp */
  168 #endif
  169 #define F_GETLK         7               /* get record locking information */
  170 #define F_SETLK         8               /* set record locking information */
  171 #define F_SETLKW        9               /* F_SETLK; wait if blocked */
  172 #if defined(_NETBSD_SOURCE)
  173 #define F_CLOSEM        10              /* close all fds >= to the one given */
  174 #define F_MAXFD         11              /* return the max open fd */
  175 #endif
  176 
  177 /* file descriptor flags (F_GETFD, F_SETFD) */
  178 #define FD_CLOEXEC      1               /* close-on-exec flag */
  179 
  180 /* record locking flags (F_GETLK, F_SETLK, F_SETLKW) */
  181 #define F_RDLCK         1               /* shared or read lock */
  182 #define F_UNLCK         2               /* unlock */
  183 #define F_WRLCK         3               /* exclusive or write lock */
  184 #ifdef _KERNEL
  185 #define F_WAIT          0x010           /* Wait until lock is granted */
  186 #define F_FLOCK         0x020           /* Use flock(2) semantics for lock */
  187 #define F_POSIX         0x040           /* Use POSIX semantics for lock */
  188 #endif
  189 
  190 /* Constants for fcntl's passed to the underlying fs - like ioctl's. */
  191 #if defined(_NETBSD_SOURCE)
  192 #define F_PARAM_MASK    0xfff
  193 #define F_PARAM_LEN(x)  (((x) >> 16) & F_PARAM_MASK)
  194 #define F_PARAM_MAX     4095
  195 #define F_FSCTL         (int)0x80000000 /* This fcntl goes to the fs */
  196 #define F_FSVOID        (int)0x40000000 /* no parameters */
  197 #define F_FSOUT         (int)0x20000000 /* copy out parameter */
  198 #define F_FSIN          (int)0x10000000 /* copy in parameter */
  199 #define F_FSINOUT       (F_FSIN | F_FSOUT)
  200 #define F_FSDIRMASK     (int)0x70000000 /* mask for IN/OUT/VOID */
  201 #define F_FSPRIV        (int)0x00008000 /* command is fs-specific */
  202 
  203 /*
  204  * Define command macros for operations which, if implemented, must be
  205  * the same for all fs's.
  206  */
  207 #define _FCN(inout, num, len) \
  208                 (F_FSCTL | inout | ((len & F_PARAM_MASK) << 16) | (num))
  209 #define _FCNO(c)        _FCN(F_FSVOID,  (c), 0)
  210 #define _FCNR(c, t)     _FCN(F_FSIN,    (c), (int)sizeof(t))
  211 #define _FCNW(c, t)     _FCN(F_FSOUT,   (c), (int)sizeof(t))
  212 #define _FCNRW(c, t)    _FCN(F_FSINOUT, (c), (int)sizeof(t))
  213 
  214 /*
  215  * Define command macros for fs-specific commands.
  216  */
  217 #define _FCN_FSPRIV(inout, fs, num, len) \
  218         (F_FSCTL | F_FSPRIV | inout | ((len & F_PARAM_MASK) << 16) |    \
  219          (fs) << 8 | (num))
  220 #define _FCNO_FSPRIV(f, c)      _FCN_FSPRIV(F_FSVOID,  (f), (c), 0)
  221 #define _FCNR_FSPRIV(f, c, t)   _FCN_FSPRIV(F_FSIN,    (f), (c), (int)sizeof(t))
  222 #define _FCNW_FSPRIV(f, c, t)   _FCN_FSPRIV(F_FSOUT,   (f), (c), (int)sizeof(t))
  223 #define _FCNRW_FSPRIV(f, c, t)  _FCN_FSPRIV(F_FSINOUT, (f), (c), (int)sizeof(t))
  224 
  225 #endif /* _NETBSD_SOURCE */
  226 
  227 /*
  228  * Advisory file segment locking data type -
  229  * information passed to system by user
  230  */
  231 struct flock {
  232         off_t   l_start;        /* starting offset */
  233         off_t   l_len;          /* len = 0 means until end of file */
  234         pid_t   l_pid;          /* lock owner */
  235         short   l_type;         /* lock type: read/write, etc. */
  236         short   l_whence;       /* type of l_start */
  237 };
  238 
  239 
  240 #if defined(_NETBSD_SOURCE)
  241 /* lock operations for flock(2) */
  242 #define LOCK_SH         0x01            /* shared file lock */
  243 #define LOCK_EX         0x02            /* exclusive file lock */
  244 #define LOCK_NB         0x04            /* don't block when locking */
  245 #define LOCK_UN         0x08            /* unlock file */
  246 #endif
  247 
  248 /* Always ensure that these are consistent with <stdio.h> and <unistd.h>! */
  249 #ifndef SEEK_SET
  250 #define SEEK_SET        0       /* set file offset to offset */
  251 #endif
  252 #ifndef SEEK_CUR
  253 #define SEEK_CUR        1       /* set file offset to current plus offset */
  254 #endif
  255 #ifndef SEEK_END
  256 #define SEEK_END        2       /* set file offset to EOF plus offset */
  257 #endif
  258 
  259 #ifndef _KERNEL
  260 #include <sys/cdefs.h>
  261 
  262 __BEGIN_DECLS
  263 int     open __P((const char *, int, ...));
  264 int     creat __P((const char *, mode_t));
  265 int     fcntl __P((int, int, ...));
  266 #if defined(_NETBSD_SOURCE)
  267 int     flock __P((int, int));
  268 #endif /* _NETBSD_SOURCE */
  269 __END_DECLS
  270 #endif /* !_KERNEL */
  271 
  272 #endif /* !_SYS_FCNTL_H_ */

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