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Annotation of researchv10dc/lsys/sys/file.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * One file structure is allocated
        !             3:  * for each open/creat/pipe call.
        !             4:  * Main use is to hold the read/write
        !             5:  * pointer associated with each open
        !             6:  * file.
        !             7:  */
        !             8: struct file
        !             9: {
        !            10:        short   f_flag;
        !            11:        short   f_count;                /* reference count */
        !            12:        struct inode *f_inode;          /* pointer to inode structure */
        !            13:        Long    f_offset;               /* read/write character pointer */
        !            14: };
        !            15: 
        !            16: #ifdef KERNEL
        !            17: extern struct file file[];
        !            18: extern struct file *fileNFILE;
        !            19: extern int filecnt;
        !            20: 
        !            21: struct file *falloc();
        !            22: struct file *allocfile();
        !            23: 
        !            24: /*
        !            25:  * inline to speed things up
        !            26:  */
        !            27: #define        getf(fd)        ((unsigned)(fd)>=NOFILE ? NULL : u.u_ofile[fd])
        !            28: 
        !            29: #endif
        !            30: 
        !            31: /* flags */
        !            32: #define        FREAD   01
        !            33: #define        FWRITE  02
        !            34: #define        FPIPE   04
        !            35: #define        FHUNGUP 010
        !            36: #define        FRNBLK  040     /* no block on read */
        !            37: #define        FWNBLK  0100    /* no block on write */

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