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

     /*-
      * SPDX-License-Identifier: BSD-3-Clause
      *
      * Copyright (c) 1983, 1990, 1993
      *      The Regents of the University of California.  All rights reserved.
      * (c) UNIX System Laboratories, Inc.
      * All or some portions of this file are derived from material licensed
      * to the University of California by American Telephone and Telegraph
      * Co. or Unix System Laboratories, Inc. and are reproduced herein with
     * the permission of UNIX System Laboratories, Inc.
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)fcntl.h     8.3 (Berkeley) 1/21/94
     * $FreeBSD$
     */
    
    #ifndef _SYS_FCNTL_H_
    #define _SYS_FCNTL_H_
    
    /*
     * This file includes the definitions for open and fcntl
     * described by POSIX for <fcntl.h>; it also includes
     * related kernel definitions.
     */
    
    #include <sys/cdefs.h>
    #include <sys/_types.h>
    
    #ifndef _MODE_T_DECLARED
    typedef __mode_t        mode_t;
    #define _MODE_T_DECLARED
    #endif
    
    #ifndef _OFF_T_DECLARED
    typedef __off_t         off_t;
    #define _OFF_T_DECLARED
    #endif
    
    #ifndef _PID_T_DECLARED
    typedef __pid_t         pid_t;
    #define _PID_T_DECLARED
    #endif
    
    /*
     * File status flags: these are used by open(2), fcntl(2).
     * They are also used (indirectly) in the kernel file structure f_flags,
     * which is a superset of the open/fcntl flags.  Open flags and f_flags
     * are inter-convertible using OFLAGS(fflags) and FFLAGS(oflags).
     * Open/fcntl flags begin with O_; kernel-internal flags begin with F.
     */
    /* open-only flags */
    #define O_RDONLY        0x0000          /* open for reading only */
    #define O_WRONLY        0x0001          /* open for writing only */
    #define O_RDWR          0x0002          /* open for reading and writing */
    #define O_ACCMODE       0x0003          /* mask for above modes */
    
    /*
     * Kernel encoding of open mode; separate read and write bits that are
     * independently testable: 1 greater than the above.
     *
     * XXX
     * FREAD and FWRITE are excluded from the #ifdef _KERNEL so that TIOCFLUSH,
     * which was documented to use FREAD/FWRITE, continues to work.
     */
    #if __BSD_VISIBLE
    #define FREAD           0x0001
    #define FWRITE          0x0002
    #endif
    #define O_NONBLOCK      0x0004          /* no delay */
    #define O_APPEND        0x0008          /* set append mode */
    #if __BSD_VISIBLE
    #define O_SHLOCK        0x0010          /* open with shared file lock */
    #define O_EXLOCK        0x0020          /* open with exclusive file lock */
    #define O_ASYNC         0x0040          /* signal pgrp when data ready */
    #define O_FSYNC         0x0080          /* synchronous writes */
    #endif
   #define O_SYNC          0x0080          /* POSIX synonym for O_FSYNC */
   #if __POSIX_VISIBLE >= 200809
   #define O_NOFOLLOW      0x0100          /* don't follow symlinks */
   #endif
   #define O_CREAT         0x0200          /* create if nonexistent */
   #define O_TRUNC         0x0400          /* truncate to zero length */
   #define O_EXCL          0x0800          /* error if already exists */
   #ifdef _KERNEL
   #define FHASLOCK        0x4000          /* descriptor holds advisory lock */
   #endif
   
   /* Defined by POSIX 1003.1; BSD default, but must be distinct from O_RDONLY. */
   #define O_NOCTTY        0x8000          /* don't assign controlling terminal */
   
   #if __BSD_VISIBLE
   /* Attempt to bypass buffer cache */
   #define O_DIRECT        0x00010000
   #endif
   
   #if __POSIX_VISIBLE >= 200809
   #define O_DIRECTORY     0x00020000      /* Fail if not directory */
   #define O_EXEC          0x00040000      /* Open for execute only */
   #define O_SEARCH        O_EXEC
   #endif
   #ifdef  _KERNEL
   #define FEXEC           O_EXEC
   #define FSEARCH         O_SEARCH
   #endif
   
   #if __POSIX_VISIBLE >= 200809
   /* Defined by POSIX 1003.1-2008; BSD default, but reserve for future use. */
   #define O_TTY_INIT      0x00080000      /* Restore default termios attributes */
   
   #define O_CLOEXEC       0x00100000
   #endif
   
   #if __BSD_VISIBLE
   #define O_VERIFY        0x00200000      /* open only after verification */
   /* #define O_UNUSED1    0x00400000   */ /* Was O_BENEATH */
   #define O_RESOLVE_BENEATH 0x00800000    /* Do not allow name resolution to walk
                                              out of cwd */
   #endif
   
   /*
    * XXX missing O_DSYNC, O_RSYNC.
    */
   
   #ifdef _KERNEL
   
   /* Only for devfs d_close() flags. */
   #define FLASTCLOSE      O_DIRECTORY
   #define FREVOKE         O_VERIFY
   /* Only for fo_close() from half-succeeded open */
   #define FOPENFAILED     O_TTY_INIT
   
   /* convert from open() flags to/from fflags; convert O_RD/WR to FREAD/FWRITE */
   #define FFLAGS(oflags)  ((oflags) & O_EXEC ? (oflags) : (oflags) + 1)
   #define OFLAGS(fflags)  ((fflags) & O_EXEC ? (fflags) : (fflags) - 1)
   
   /* bits to save after open */
   #define FMASK   (FREAD|FWRITE|FAPPEND|FASYNC|FFSYNC|FNONBLOCK|O_DIRECT|FEXEC)
   /* bits settable by fcntl(F_SETFL, ...) */
   #define FCNTLFLAGS      (FAPPEND|FASYNC|FFSYNC|FNONBLOCK|FRDAHEAD|O_DIRECT)
   
   #if defined(COMPAT_FREEBSD7) || defined(COMPAT_FREEBSD6) || \
       defined(COMPAT_FREEBSD5) || defined(COMPAT_FREEBSD4)
   /*
    * Set by shm_open(3) in older libc's to get automatic MAP_ASYNC
    * behavior for POSIX shared memory objects (which are otherwise
    * implemented as plain files).
    */
   #define FPOSIXSHM       O_NOFOLLOW
   #undef FCNTLFLAGS
   #define FCNTLFLAGS      (FAPPEND|FASYNC|FFSYNC|FNONBLOCK|FPOSIXSHM|FRDAHEAD| \
                            O_DIRECT)
   #endif
   #endif
   
   /*
    * The O_* flags used to have only F* names, which were used in the kernel
    * and by fcntl.  We retain the F* names for the kernel f_flag field
    * and for backward compatibility for fcntl.  These flags are deprecated.
    */
   #if __BSD_VISIBLE
   #define FAPPEND         O_APPEND        /* kernel/compat */
   #define FASYNC          O_ASYNC         /* kernel/compat */
   #define FFSYNC          O_FSYNC         /* kernel */
   #define FNONBLOCK       O_NONBLOCK      /* kernel */
   #define FNDELAY         O_NONBLOCK      /* compat */
   #define O_NDELAY        O_NONBLOCK      /* compat */
   #endif
   
   /*
    * We are out of bits in f_flag (which is a short).  However,
    * the flag bits not set in FMASK are only meaningful in the
    * initial open syscall.  Those bits can thus be given a
    * different meaning for fcntl(2).
    */
   #if __BSD_VISIBLE
   /* Read ahead */
   #define FRDAHEAD        O_CREAT
   #endif
   
   #if __POSIX_VISIBLE >= 200809
   /*
    * Magic value that specify the use of the current working directory
    * to determine the target of relative file paths in the openat() and
    * similar syscalls.
    */
   #define AT_FDCWD                -100
   
   /*
    * Miscellaneous flags for the *at() syscalls.
    */
   #define AT_EACCESS              0x0100  /* Check access using effective user
                                              and group ID */
   #define AT_SYMLINK_NOFOLLOW     0x0200  /* Do not follow symbolic links */
   #define AT_SYMLINK_FOLLOW       0x0400  /* Follow symbolic link */
   #define AT_REMOVEDIR            0x0800  /* Remove directory instead of file */
   #endif  /* __POSIX_VISIBLE >= 200809 */
   #if __BSD_VISIBLE
   /* #define AT_UNUSED1           0x1000 *//* Was AT_BENEATH */
   #define AT_RESOLVE_BENEATH      0x2000  /* Do not allow name resolution
                                              to walk out of dirfd */
   #endif  /* __BSD_VISIBLE */
   
   /*
    * Constants used for fcntl(2)
    */
   
   /* command values */
   #define F_DUPFD         0               /* duplicate file descriptor */
   #define F_GETFD         1               /* get file descriptor flags */
   #define F_SETFD         2               /* set file descriptor flags */
   #define F_GETFL         3               /* get file status flags */
   #define F_SETFL         4               /* set file status flags */
   #if __XSI_VISIBLE || __POSIX_VISIBLE >= 200112
   #define F_GETOWN        5               /* get SIGIO/SIGURG proc/pgrp */
   #define F_SETOWN        6               /* set SIGIO/SIGURG proc/pgrp */
   #endif
   #if __BSD_VISIBLE
   #define F_OGETLK        7               /* get record locking information */
   #define F_OSETLK        8               /* set record locking information */
   #define F_OSETLKW       9               /* F_SETLK; wait if blocked */
   #define F_DUP2FD        10              /* duplicate file descriptor to arg */
   #endif
   #define F_GETLK         11              /* get record locking information */
   #define F_SETLK         12              /* set record locking information */
   #define F_SETLKW        13              /* F_SETLK; wait if blocked */
   #if __BSD_VISIBLE
   #define F_SETLK_REMOTE  14              /* debugging support for remote locks */
   #define F_READAHEAD     15              /* read ahead */
   #define F_RDAHEAD       16              /* Darwin compatible read ahead */
   #endif
   #if __POSIX_VISIBLE >= 200809
   #define F_DUPFD_CLOEXEC 17              /* Like F_DUPFD, but FD_CLOEXEC is set */
   #endif
   #if __BSD_VISIBLE
   #define F_DUP2FD_CLOEXEC 18             /* Like F_DUP2FD, but FD_CLOEXEC is set */
   #endif
   
   /* file descriptor flags (F_GETFD, F_SETFD) */
   #define FD_CLOEXEC      1               /* close-on-exec flag */
   
   /* record locking flags (F_GETLK, F_SETLK, F_SETLKW) */
   #define F_RDLCK         1               /* shared or read lock */
   #define F_UNLCK         2               /* unlock */
   #define F_WRLCK         3               /* exclusive or write lock */
   #if __BSD_VISIBLE
   #define F_UNLCKSYS      4               /* purge locks for a given system ID */ 
   #define F_CANCEL        5               /* cancel an async lock request */
   #endif
   #ifdef _KERNEL
   #define F_WAIT          0x010           /* Wait until lock is granted */
   #define F_FLOCK         0x020           /* Use flock(2) semantics for lock */
   #define F_POSIX         0x040           /* Use POSIX semantics for lock */
   #define F_REMOTE        0x080           /* Lock owner is remote NFS client */
   #define F_NOINTR        0x100           /* Ignore signals when waiting */
   #endif
   
   /*
    * Advisory file segment locking data type -
    * information passed to system by user
    */
   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 */
           short   l_type;         /* lock type: read/write, etc. */
           short   l_whence;       /* type of l_start */
           int     l_sysid;        /* remote system id or zero for local */
   };
   
   #if __BSD_VISIBLE
   /*
    * Old advisory file segment locking data type,
    * before adding l_sysid.
    */
   struct __oflock {
           off_t   l_start;        /* starting offset */
           off_t   l_len;          /* len = 0 means until end of file */
           pid_t   l_pid;          /* lock owner */
           short   l_type;         /* lock type: read/write, etc. */
           short   l_whence;       /* type of l_start */
   };
   #endif
   
   #if __BSD_VISIBLE
   /* lock operations for flock(2) */
   #define LOCK_SH         0x01            /* shared file lock */
   #define LOCK_EX         0x02            /* exclusive file lock */
   #define LOCK_NB         0x04            /* don't block when locking */
   #define LOCK_UN         0x08            /* unlock file */
   #endif
   
   #if __POSIX_VISIBLE >= 200112
   /*
    * Advice to posix_fadvise
    */
   #define POSIX_FADV_NORMAL       0       /* no special treatment */
   #define POSIX_FADV_RANDOM       1       /* expect random page references */
   #define POSIX_FADV_SEQUENTIAL   2       /* expect sequential page references */
   #define POSIX_FADV_WILLNEED     3       /* will need these pages */
   #define POSIX_FADV_DONTNEED     4       /* dont need these pages */
   #define POSIX_FADV_NOREUSE      5       /* access data only once */
   #endif
   
   #ifndef _KERNEL
   __BEGIN_DECLS
   int     open(const char *, int, ...);
   int     creat(const char *, mode_t);
   int     fcntl(int, int, ...);
   #if __BSD_VISIBLE
   int     flock(int, int);
   #endif
   #if __POSIX_VISIBLE >= 200809
   int     openat(int, const char *, int, ...);
   #endif
   #if __POSIX_VISIBLE >= 200112
   int     posix_fadvise(int, off_t, off_t, int);
   int     posix_fallocate(int, off_t, off_t);
   #endif
   __END_DECLS
   #endif
   
   #endif /* !_SYS_FCNTL_H_ */

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