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Annotation of researchv10dc/lsys/sys/file.h, revision 1.1.1.1

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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