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Annotation of Net2/sys/fcntl.h, revision 1.1

1.1     ! root        1: /*-
        !             2:  * Copyright (c) 1983, 1990 The Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms, with or without
        !             6:  * modification, are permitted provided that the following conditions
        !             7:  * are met:
        !             8:  * 1. Redistributions of source code must retain the above copyright
        !             9:  *    notice, this list of conditions and the following disclaimer.
        !            10:  * 2. Redistributions in binary form must reproduce the above copyright
        !            11:  *    notice, this list of conditions and the following disclaimer in the
        !            12:  *    documentation and/or other materials provided with the distribution.
        !            13:  * 3. All advertising materials mentioning features or use of this software
        !            14:  *    must display the following acknowledgement:
        !            15:  *     This product includes software developed by the University of
        !            16:  *     California, Berkeley and its contributors.
        !            17:  * 4. Neither the name of the University nor the names of its contributors
        !            18:  *    may be used to endorse or promote products derived from this software
        !            19:  *    without specific prior written permission.
        !            20:  *
        !            21:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            22:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            23:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            24:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            25:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            26:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            27:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            28:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            29:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            30:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            31:  * SUCH DAMAGE.
        !            32:  *
        !            33:  *     @(#)fcntl.h     5.14 (Berkeley) 7/1/91
        !            34:  */
        !            35: 
        !            36: #ifndef _FCNTL_H_
        !            37: #define        _FCNTL_H_
        !            38: 
        !            39: /*
        !            40:  * This file includes the definitions for open and fcntl
        !            41:  * described by POSIX for <fcntl.h>; it also includes
        !            42:  * related kernel definitions.
        !            43:  */
        !            44: 
        !            45: #ifndef KERNEL
        !            46: #include <sys/types.h>
        !            47: #endif
        !            48: 
        !            49: /*
        !            50:  * File status flags: these are used by open(2), fcntl(2).
        !            51:  * They are also used (indirectly) in the kernel file structure f_flags,
        !            52:  * which is a superset of the open/fcntl flags.  Open flags and f_flags
        !            53:  * are inter-convertible using OFLAGS(fflags) and FFLAGS(oflags).
        !            54:  * Open/fcntl flags begin with O_; kernel-internal flags begin with F.
        !            55:  */
        !            56: /* open-only flags */
        !            57: #define        O_RDONLY        0x0000          /* open for reading only */
        !            58: #define        O_WRONLY        0x0001          /* open for writing only */
        !            59: #define        O_RDWR          0x0002          /* open for reading and writing */
        !            60: #define        O_ACCMODE       0x0003          /* mask for above modes */
        !            61: 
        !            62: #ifdef KERNEL
        !            63: /*
        !            64:  * Kernel encoding of open mode; separate read and write bits
        !            65:  * that are independently testable: 1 greater than the above.
        !            66:  */
        !            67: #define        FREAD           0x0001
        !            68: #define        FWRITE          0x0002
        !            69: #endif
        !            70: #define        O_NONBLOCK      0x0004          /* no delay */
        !            71: #define        O_APPEND        0x0008          /* set append mode */
        !            72: #ifndef _POSIX_SOURCE
        !            73: #define        O_SHLOCK        0x0010          /* open with shared file lock */
        !            74: #define        O_EXLOCK        0x0020          /* open with exclusive file lock */
        !            75: #define        O_ASYNC         0x0040          /* signal pgrp when data ready */
        !            76: #define        O_FSYNC         0x0080          /* synchronous writes */
        !            77: #endif
        !            78: #define        O_CREAT         0x0200          /* create if nonexistant */
        !            79: #define        O_TRUNC         0x0400          /* truncate to zero length */
        !            80: #define        O_EXCL          0x0800          /* error if already exists */
        !            81: #ifdef KERNEL
        !            82: #define        FMARK           0x1000          /* mark during gc() */
        !            83: #define        FDEFER          0x2000          /* defer for next gc pass */
        !            84: #define        FHASLOCK        0x4000          /* descriptor holds advisory lock */
        !            85: #endif
        !            86: 
        !            87: /* defined by POSIX 1003.1; BSD default, so no bit required */
        !            88: #define        O_NOCTTY        0               /* don't assign controlling terminal */
        !            89: 
        !            90: #ifdef KERNEL
        !            91: /* convert from open() flags to/from fflags; convert O_RD/WR to FREAD/FWRITE */
        !            92: #define        FFLAGS(oflags)  ((oflags) + 1)
        !            93: #define        OFLAGS(fflags)  ((fflags) - 1)
        !            94: 
        !            95: /* bits to save after open */
        !            96: #define        FMASK           (FREAD|FWRITE|FAPPEND|FASYNC|FFSYNC|FNONBLOCK)
        !            97: /* bits settable by fcntl(F_SETFL, ...) */
        !            98: #define        FCNTLFLAGS      (FAPPEND|FASYNC|FFSYNC|FNONBLOCK)
        !            99: #endif
        !           100: 
        !           101: /*
        !           102:  * The O_* flags used to have only F* names, which were used in the kernel
        !           103:  * and by fcntl.  We retain the F* names for the kernel f_flags field
        !           104:  * and for backward compatibility for fcntl.
        !           105:  */
        !           106: #ifndef _POSIX_SOURCE
        !           107: #define        FAPPEND         O_APPEND        /* kernel/compat */
        !           108: #define        FASYNC          O_ASYNC         /* kernel/compat */
        !           109: #define        FFSYNC          O_FSYNC         /* kernel */
        !           110: #define        FNONBLOCK       O_NONBLOCK      /* kernel */
        !           111: #define        FNDELAY         O_NONBLOCK      /* compat */
        !           112: #define        O_NDELAY        O_NONBLOCK      /* compat */
        !           113: #endif
        !           114: 
        !           115: /*
        !           116:  * Constants used for fcntl(2)
        !           117:  */
        !           118: 
        !           119: /* command values */
        !           120: #define        F_DUPFD         0               /* duplicate file descriptor */
        !           121: #define        F_GETFD         1               /* get file descriptor flags */
        !           122: #define        F_SETFD         2               /* set file descriptor flags */
        !           123: #define        F_GETFL         3               /* get file status flags */
        !           124: #define        F_SETFL         4               /* set file status flags */
        !           125: #ifndef _POSIX_SOURCE
        !           126: #define        F_GETOWN        5               /* get SIGIO/SIGURG proc/pgrp */
        !           127: #define F_SETOWN       6               /* set SIGIO/SIGURG proc/pgrp */
        !           128: #endif
        !           129: #define        F_GETLK         7               /* get record locking information */
        !           130: #define        F_SETLK         8               /* set record locking information */
        !           131: #define        F_SETLKW        9               /* F_SETLK; wait if blocked */
        !           132: 
        !           133: /* file descriptor flags (F_GETFD, F_SETFD) */
        !           134: #define        FD_CLOEXEC      1               /* close-on-exec flag */
        !           135: 
        !           136: /* record locking flags (F_GETLK, F_SETLK, F_SETLKW) */
        !           137: #define        F_RDLCK         1               /* shared or read lock */
        !           138: #define        F_UNLCK         2               /* unlock */
        !           139: #define        F_WRLCK         3               /* exclusive or write lock */
        !           140: #ifdef KERNEL
        !           141: #define        F_WAIT          0x010           /* Wait until lock is granted */
        !           142: #define        F_FLOCK         0x020           /* Use flock(2) semantics for lock */
        !           143: #define        F_POSIX         0x040           /* Use POSIX semantics for lock */
        !           144: #endif
        !           145: 
        !           146: /*
        !           147:  * Advisory file segment locking data type -
        !           148:  * information passed to system by user
        !           149:  */
        !           150: struct flock {
        !           151:        short   l_type;         /* lock type: read/write, etc. */
        !           152:        short   l_whence;       /* type of l_start */
        !           153:        off_t   l_start;        /* starting offset */
        !           154:        off_t   l_len;          /* len = 0 means until end of file */
        !           155:        pid_t   l_pid;          /* lock owner */
        !           156: };
        !           157: 
        !           158: 
        !           159: #ifndef _POSIX_SOURCE
        !           160: /* lock operations for flock(2) */
        !           161: #define        LOCK_SH         0x01            /* shared file lock */
        !           162: #define        LOCK_EX         0x02            /* exclusive file lock */
        !           163: #define        LOCK_NB         0x04            /* don't block when locking */
        !           164: #define        LOCK_UN         0x08            /* unlock file */
        !           165: #endif
        !           166: 
        !           167: 
        !           168: #ifndef KERNEL
        !           169: #include <sys/cdefs.h>
        !           170: 
        !           171: __BEGIN_DECLS
        !           172: int    open __P((const char *, int, ...));
        !           173: int    creat __P((const char *, mode_t));
        !           174: int    fcntl __P((int, int, ...));
        !           175: #ifndef _POSIX_SOURCE
        !           176: int    flock __P((int, int));
        !           177: #endif /* !_POSIX_SOURCE */
        !           178: __END_DECLS
        !           179: #endif
        !           180: 
        !           181: #endif /* !_FCNTL_H_ */

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