Return to ndir.h CVS log

Up to [Research Unix] / researchv10no / cmd / netnews / src

Annotation of researchv10no/cmd/netnews/src/ndir.h, revision 1.1.1.1

1.1       root        1: 
                      2: /*
                      3:  * Copyright (c) 1982 Regents of the University of California
                      4:  */
                      5: 
                      6: /* @(#)ndir.h 4.4 3/30/82 */
                      7: 
                      8: /*
                      9:  * This sets the "page size" for directories.
                     10:  * Requirements are DEV_BSIZE <= DIRBLKSIZ <= MINBSIZE with
                     11:  * DIRBLKSIZ a power of two.
                     12:  * Dennis Ritchie feels that directory pages should be atomic
                     13:  * operations to the disk, so we use DEV_BSIZE.
                     14:  */
                     15: #define DIRBLKSIZ 512
                     16: 
                     17: /*
                     18:  * This limits the directory name length. Its main constraint
                     19:  * is that it appears twice in the user structure. (u. area)
                     20:  */
                     21: #define MAXNAMLEN 255
                     22: 
                     23: struct direct {
                     24:        ino_t   d_ino;
                     25:        short   d_reclen;
                     26:        short   d_namlen;
                     27:        char    d_name[MAXNAMLEN + 1];
                     28:        /* typically shorter */
                     29: };
                     30: 
                     31: struct _dirdesc {
                     32:        int     dd_fd;
                     33:        long    dd_loc;
                     34:        long    dd_size;
                     35:        char    dd_buf[DIRBLKSIZ];
                     36: };
                     37: 
                     38: /*
                     39:  * useful macros.
                     40:  */
                     41: #undef DIRSIZ
                     42: #define DIRSIZ(dp) \
                     43:     ((sizeof(struct direct) - MAXNAMLEN + (dp)->d_namlen + sizeof(ino_t) - 1) &\
                     44:     ~(sizeof(ino_t) - 1))
                     45: typedef        struct _dirdesc DIR;
                     46: #ifndef        NULL
                     47: #define        NULL    0
                     48: #endif
                     49: 
                     50: /*
                     51:  * functions defined on directories
                     52:  */
                     53: extern DIR *opendir();
                     54: extern struct direct *readdir();
                     55: extern long telldir();
                     56: extern void seekdir();
                     57: #define rewinddir(dirp)        seekdir((dirp), 0)
                     58: extern void closedir();

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.