c - Is it possible to implement readdir() in Ubuntu 12.10 (kernel 3.5)? -

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in 8.6 of k & r, authors implemented simple version of readdir(). code follows:

#include <sys/dir.h>   /* local directory structure */ /* readdir:  read directory entries in sequence */ dirent *readdir(dir *dp) {    struct direct dirbuf;  /* local directory structure */    static dirent  d;      /* return: portable structure */    while (read(dp->fd, (char *) &dirbuf, sizeof(dirbuf))                    == sizeof(dirbuf)) {        if (dirbuf.d_ino == 0) /* slot not in use */            continue;        d.ino = dirbuf.d_ino;        strncpy(d.name, dirbuf.d_name, dirsiz);        d.name[dirsiz] = '\0';  /* ensure termination */        return &d;    }    return null; }

in opinion, in line read(), dp->fd file descriptor of directory. authors used read() struct direct directly directory file.

however, in ubuntu, not possible read directory file. when tried read directory, got strange.

i read in apue in systems, action not allowed. there other ways realize own readdir()?

you looking @ code 40 years ago. directories not implemented on modern platform. read documentation filesystem (ext4 if on linux) if need write code manipulate it.


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