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       readdir - read a directory


       #include <sys/types.h>

       #include <dirent.h>

       struct dirent *readdir(DIR *dir);


       The  readdir()  function  returns  a  pointer  to  a  dirent  structure
       representing the next directory entry in the directory  stream  pointed
       to  by dir.  It returns NULL on reaching the end-of-file or if an error

       On Linux, the dirent structure is defined as follows:

           struct dirent {
               ino_t          d_ino;       /* inode number */
               off_t          d_off;       /* offset to the next dirent */
               unsigned short d_reclen;    /* length of this record */
               unsigned char  d_type;      /* type of file */
               char           d_name[256]; /* filename */

       According to POSIX, the dirent structure contains a field char d_name[]
       of  unspecified  size,  with  at most NAME_MAX characters preceding the
       terminating null byte.  POSIX.1-2001 also  documents  the  field  ino_t
       d_ino  as  an  XSI extension.  The other fields are unstandardized, and
       not present on all systems; see NOTES below for some further details.

       The data returned by readdir() may be overwritten by  subsequent  calls
       to readdir() for the same directory stream.


       The readdir() function returns a pointer to a dirent structure, or NULL
       if an error occurs or end-of-file is reached.  On error, errno  is  set


       EBADF  Invalid directory stream descriptor dir.


       SVr4, 4.3BSD, POSIX.1-2001


       Only  the  fields  d_name and d_ino are specified in POSIX.1-2001.  The
       remaining fields are available on many, but  not  all  systems.   Under
       glibc,  programs  can  check  for  the  availability  of the fields not
       defined in POSIX.1 by testing whether the macros _DIRENT_HAVE_D_NAMLEN,

       Other than Linux, the d_type field is  available  mainly  only  on  BSD
       systems.   This field makes it possible to avoid the expense of calling
       stat(2) if further actions depend on the type  of  the  file.   If  the
       _BSD_SOURCE  feature  test  macro  is  defined,  then glibc defines the
       following macro constants for the value returned in d_type:

       DT_BLK      This is a block device.

       DT_CHR      This is a character device.

       DT_DIR      This is a directory.

       DT_FIFO     This is a named pipe (FIFO).

       DT_LNK      This is a symbolic link.

       DT_REG      This is a regular file.

       DT_SOCK     This is a Unix domain socket.

       DT_UNKNOWN  The file type is unknown.

       If the file type could not  be  determined,  the  value  DT_UNKNOWN  is
       returned in d_type.


       read(2),   closedir(3),  dirfd(3),  ftw(3),  opendir(3),  rewinddir(3),
       scandir(3), seekdir(3), telldir(3), feature_test_macros(7)


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       be found at

                                  2008-06-20                        READDIR(3)