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Annotation of 43BSD/sys/h/file.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1982, 1986 Regents of the University of California.
        !             3:  * All rights reserved.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  *
        !             6:  *     @(#)file.h      7.1 (Berkeley) 6/4/86
        !             7:  */
        !             8: 
        !             9: #ifdef KERNEL
        !            10: /*
        !            11:  * Descriptor table entry.
        !            12:  * One for each kernel object.
        !            13:  */
        !            14: struct file {
        !            15:        int     f_flag;         /* see below */
        !            16:        short   f_type;         /* descriptor type */
        !            17:        short   f_count;        /* reference count */
        !            18:        short   f_msgcount;     /* references from message queue */
        !            19:        struct  fileops {
        !            20:                int     (*fo_rw)();
        !            21:                int     (*fo_ioctl)();
        !            22:                int     (*fo_select)();
        !            23:                int     (*fo_close)();
        !            24:        } *f_ops;
        !            25:        caddr_t f_data;         /* inode */
        !            26:        off_t   f_offset;
        !            27: };
        !            28: 
        !            29: struct file *file, *fileNFILE;
        !            30: int    nfile;
        !            31: struct file *getf();
        !            32: struct file *falloc();
        !            33: #endif
        !            34: 
        !            35: /*
        !            36:  * flags- also for fcntl call.
        !            37:  */
        !            38: #define        FOPEN           (-1)
        !            39: #define        FREAD           00001           /* descriptor read/receive'able */
        !            40: #define        FWRITE          00002           /* descriptor write/send'able */
        !            41: #ifndef        F_DUPFD
        !            42: #define        FNDELAY         00004           /* no delay */
        !            43: #define        FAPPEND         00010           /* append on each write */
        !            44: #endif
        !            45: #define        FMARK           00020           /* mark during gc() */
        !            46: #define        FDEFER          00040           /* defer for next gc pass */
        !            47: #ifndef        F_DUPFD
        !            48: #define        FASYNC          00100           /* signal pgrp when data ready */
        !            49: #endif
        !            50: #define        FSHLOCK         00200           /* shared lock present */
        !            51: #define        FEXLOCK         00400           /* exclusive lock present */
        !            52: 
        !            53: /* bits to save after open */
        !            54: #define        FMASK           00113
        !            55: #define        FCNTLCANT       (FREAD|FWRITE|FMARK|FDEFER|FSHLOCK|FEXLOCK)
        !            56: 
        !            57: /* open only modes */
        !            58: #define        FCREAT          01000           /* create if nonexistant */
        !            59: #define        FTRUNC          02000           /* truncate to zero length */
        !            60: #define        FEXCL           04000           /* error if already created */
        !            61: 
        !            62: #ifndef        F_DUPFD
        !            63: /* fcntl(2) requests--from <fcntl.h> */
        !            64: #define        F_DUPFD 0       /* Duplicate fildes */
        !            65: #define        F_GETFD 1       /* Get fildes flags */
        !            66: #define        F_SETFD 2       /* Set fildes flags */
        !            67: #define        F_GETFL 3       /* Get file flags */
        !            68: #define        F_SETFL 4       /* Set file flags */
        !            69: #define        F_GETOWN 5      /* Get owner */
        !            70: #define F_SETOWN 6     /* Set owner */
        !            71: #endif
        !            72: 
        !            73: /*
        !            74:  * User definitions.
        !            75:  */
        !            76: 
        !            77: /*
        !            78:  * Open call.
        !            79:  */
        !            80: #define        O_RDONLY        000             /* open for reading */
        !            81: #define        O_WRONLY        001             /* open for writing */
        !            82: #define        O_RDWR          002             /* open for read & write */
        !            83: #define        O_NDELAY        FNDELAY         /* non-blocking open */
        !            84: #define        O_APPEND        FAPPEND         /* append on each write */
        !            85: #define        O_CREAT         FCREAT          /* open with file create */
        !            86: #define        O_TRUNC         FTRUNC          /* open with truncation */
        !            87: #define        O_EXCL          FEXCL           /* error on create if file exists */
        !            88: 
        !            89: /*
        !            90:  * Flock call.
        !            91:  */
        !            92: #define        LOCK_SH         1       /* shared lock */
        !            93: #define        LOCK_EX         2       /* exclusive lock */
        !            94: #define        LOCK_NB         4       /* don't block when locking */
        !            95: #define        LOCK_UN         8       /* unlock */
        !            96: 
        !            97: /*
        !            98:  * Access call.
        !            99:  */
        !           100: #define        F_OK            0       /* does file exist */
        !           101: #define        X_OK            1       /* is it executable by caller */
        !           102: #define        W_OK            2       /* writable by caller */
        !           103: #define        R_OK            4       /* readable by caller */
        !           104: 
        !           105: /*
        !           106:  * Lseek call.
        !           107:  */
        !           108: #define        L_SET           0       /* absolute offset */
        !           109: #define        L_INCR          1       /* relative to current offset */
        !           110: #define        L_XTND          2       /* relative to end of file */
        !           111: 
        !           112: #ifdef KERNEL
        !           113: #define        GETF(fp, fd) { \
        !           114:        if ((unsigned)(fd) >= NOFILE || ((fp) = u.u_ofile[fd]) == NULL) { \
        !           115:                u.u_error = EBADF; \
        !           116:                return; \
        !           117:        } \
        !           118: }
        !           119: #define        DTYPE_INODE     1       /* file */
        !           120: #define        DTYPE_SOCKET    2       /* communications endpoint */
        !           121: #endif

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