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directory(3)							  directory(3)

Name
       opendir,	 readdir,  telldir,  seekdir,  rewinddir, closedir - directory
       operations

Syntax
       #include <sys/types.h>
       #include <sys/dir.h>

       DIR *opendir(dirname)
       char *dirname;

       struct direct *readdir(dirp)
       DIR *dirp;

       long telldir(dirp)
       DIR *dirp;

       void seekdir(dirp, loc)
       DIR *dirp;
       long loc;

       void rewinddir(dirp)
       DIR *dirp;

       int closedir(dirp)
       DIR *dirp;

Description
       The library routine opens the directory named  by  filename  and	 asso‐
       ciates  a  directory stream with it.  A pointer is returned to identify
       the directory stream in subsequent operations.	The  pointer  NULL  is
       returned	 if the specified filename can not be accessed, or if insuffi‐
       cient memory is available to open the directory file.

       The routine returns a pointer to the next directory entry.  It  returns
       NULL  upon reaching the end of the directory or on detecting an invalid
       operation.  The routine uses the system call to read directories. Since
       the  routine  returns NULL upon reaching the end of the directory or on
       detecting an error, an application which wishes to detect  the  differ‐
       ence must set errno to 0 prior to calling

       The  routine  returns  the  current  location associated with the named
       directory stream. Values returned by are good only for the lifetime  of
       the  DIR	 pointer  from	which  they  are derived.  If the directory is
       closed and then reopened, the value may be  invalidated	due  to	 unde‐
       tected directory compaction.

       The  routine  sets  the position of the next operation on the directory
       stream.	Only values returned by should be used with

       The routine resets the position of the named directory  stream  to  the
       beginning of the directory.

       The  routine closes the named directory stream and returns a value of 0
       if successful. Otherwise, a value of -1 is returned and errno is set to
       indicate	 the  error.   All  resources  associated  with this directory
       stream are released.

Examples
       The following sample code searches a directory for the entry name.
       len = strlen(name);

       dirp = opendir(".");

       for (dp = readdir(dirp); dp != NULL; dp = readdir(dirp))

       if (dp->d_namlen == len && !strcmp(dp->d_name, name)) {

		 closedir(dirp);

		 return FOUND;

	    }

       closedir(dirp);

       return NOT_FOUND;

Environment
       In the POSIX environment, the  file  descriptor	returned  in  the  DIR
       structure  after	 an  call  will	 have  the  FD_CLOEXEC	flag set.  See
       <fcntl.h> for more detail.

Return Values
       Upon successful completion, returns a pointer to an object of type DIR.
       Otherwise, a value of NULL is returned and errno is set to indicate the
       error.

       The routine returns a pointer to an object of type struct  dirent  upon
       successful  completion.	 Otherwise,  a	value  of NULL is returned and
       errno is set to indicate the error.  When the end of the	 directory  is
       encountered, a value of NULL is returned and errno is not changed.

       The  routine  returns  the current location.  No errors are defined for
       and

       The routine returns zero	 upon  successful  completion.	 Otherwise,  a
       value of -1 is returned and errno is set to indicate the error.

Diagnostics
       The routine will fail if:

       [EBADF]	      The  dirp	 argument  does not refer to an open directory
		      stream.

       [EINTR]	      The routine was interrupted by a signal.

       The routine will fail if:

       [EACCES]	      Search permission is denied for any component of dirname
		      or read permission is denied for dirname.

       [ENAMETOOLONG] The  length of the dirname string exceeds {PATH_MAX}, or
		      a pathname component is longer than {NAME_MAX}.

       [ENOENT]	      The dirname argument points to the name of a file	 which
		      does  not	 exist, or to an empty string and the environ‐
		      ment defined is POSIX or SYSTEM_FIVE.

       [ENOTDIR]      A component of dirname is not a directory.

       [EMFILE]	      Too many file descriptors are  currently	open  for  the
		      process.

       [ENFILE]	      Too many files are currently open in the system.

       The routine will fail if:

       [EBADF]	      The  dirp	 argument  does not refer to an open directory
		      stream.

See Also
       close(2), getdirentries(2), lseek(2), open(2), read(2), dir(5)

								  directory(3)
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