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Annotation of researchv10no/dk/cmd/pupu/ndir.h, revision 1.1

1.1     ! root        1: /*
        !             2:  *             @(#)ndir.h      2.1 DKHOST 85/01/15
        !             3:  */
        !             4: 
        !             5: /*
        !             6:  * This sets the "page size" for directories.
        !             7:  * Requirements are DEV_BSIZE <= DIRBLKSIZ <= MINBSIZE with
        !             8:  * DIRBLKSIZ a power of two.
        !             9:  * Dennis Ritchie feels that directory pages should be atomic
        !            10:  * operations to the disk, so we use DEV_BSIZE.
        !            11:  */
        !            12: #define DIRBLKSIZ 512
        !            13: 
        !            14: /*
        !            15:  * This limits the directory name length. Its main constraint
        !            16:  * is that it appears twice in the user structure. (u. area)
        !            17:  */
        !            18: #define MAXNAMLEN 255
        !            19: 
        !            20: struct direct {
        !            21:        ino_t   d_ino;
        !            22:        short   d_reclen;
        !            23:        short   d_namlen;
        !            24:        char    d_name[MAXNAMLEN + 1];
        !            25:        /* typically shorter */
        !            26: };
        !            27: 
        !            28: struct _dirdesc {
        !            29:        int     dd_fd;
        !            30:        long    dd_loc;
        !            31:        long    dd_size;
        !            32:        char    dd_buf[DIRBLKSIZ];
        !            33: };
        !            34: 
        !            35: /*
        !            36:  * useful macros.
        !            37:  */
        !            38: #undef DIRSIZ
        !            39: #define DIRSIZ(dp) \
        !            40:     ((sizeof(struct direct) - MAXNAMLEN + (dp)->d_namlen + sizeof(ino_t) - 1) &\
        !            41:     ~(sizeof(ino_t) - 1))
        !            42: typedef        struct _dirdesc DIR;
        !            43: #ifndef        NULL
        !            44: #define        NULL    0
        !            45: #endif
        !            46: 
        !            47: /*
        !            48:  * functions defined on directories
        !            49:  */
        !            50: extern DIR *opendir(), *fdopendir();
        !            51: extern struct direct *readdir();
        !            52: extern long telldir();
        !            53: extern void seekdir();
        !            54: #define rewinddir(dirp)        seekdir((dirp), 0)
        !            55: extern void closedir();

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