/** @file  ../include/ftw.h

@internalComponent

*/

/** @fn  ftw(const char *path, int (*fn)(const char *, const struct stat *, int), int nfds)

@param path

@param fn

@param nfds

@return   If the tree is exhausted, ftw() shall return 0.

If the function pointed to by fn returns a non-zero value, ftw() shall stop its tree traversal and 

return whatever value was returned by the function pointed to by fn. 

If ftw() detects an error, it shall return -1 and set errno to indicate the error.

The ftw() function shall recursively descend the directory hierarchy rooted in path.

For each object in the hierarchy, ftw() shall call the function pointed to by fn,

passing it a pointer to a null-terminated character string containing the name of the object,

a pointer to a stat structure containing information about the object, and an integer.Possible values of the integer are:

FTW_D

    For a directory.

FTW_DNR

    For a directory that cannot be read.

FTW_F

    For a file.

FTW_SL

    For a symbolic link (but see also FTW_NS below).

FTW_NS

    For an object other than a symbolic link on which stat() could not successfully be executed.

    If the object is a symbolic link and stat() failed,

    it is unspecified whether ftw() passes FTW_SL or FTW_NS to the user-supplied function. 

The argument nfds should be in the range [1, {OPEN_MAX}].

Errors:

[EACCES]

    Search permission is denied for any component of path or read permission is denied for path.

[ELOOP]

    A loop exists in symbolic links encountered during resolution of the path argument.

[ENAMETOOLONG]

    The length of the path argument exceeds {PATH_MAX} or a pathname component is longer than {NAME_MAX}.

[ENOENT]

    A component of path does not name an existing file or path is an empty string.

[ENOTDIR]

    A component of path is not a directory.

[EOVERFLOW]

    A field in the stat structure cannot be represented correctly in the current programming environment

    for one or more files found in the file hierarchy. 

Examples:

@code

/*  Detailed description:  Sample usage of ftw system call

 *  Preconditions:  Function fn with the specified prototype should be defined and

 *  should have atleast two objects in the current working directory. 

 */

#include <ftw.h>

#include <stdlib.h>

#include <stdio.h>

if (ftw(".", fn, 2) != 0) {

    perror("ftw"); exit(2);

}

else

{

	printf("ftw call succeded");

}

@endcode

 Output

@code

ftw call succeded

@endcode

@see stat()

@capability Deferred @ref RFs::Entry(const TDesC16&, TEntry&)

@publishedAll

@externallyDefinedApi

*/

/** @fn  ftw64(const char *path, int (*fn)(const char *, const struct stat64 *, int), int nfds)

@param path

@param fn

@param nfds

@return   If the tree is exhausted, ftw64() shall return 0.

If the function pointed to by fn returns a non-zero value, ftw64() shall stop its tree traversal and 

return whatever value was returned by the function pointed to by fn. 

If ftw64() detects an error, it shall return -1 and set errno to indicate the error.

For full documentation see: http://www.unix.org/version2/whatsnew/lfs20mar.html#3.0

@see ftw()

@publishedAll

@externallyDefinedApi

*/

/** @def FTW_F

Regular File. Valid flags for the 3rd argument to the function that is passed as the second argument to ftw(3) and nftw(3).

@publishedAll

@externallyDefinedApi

*/

/** @def FTW_D

Valid flags for the 3rd argument to the function that is passed as the second argument to ftw(3) and nftw(3).

Directory.

@publishedAll

@externallyDefinedApi

*/

/** @def FTW_DNR

Valid flags for the 3rd argument to the function that is passed as the second argument to ftw(3) and nftw(3).

Directory without read permission.

@publishedAll

@externallyDefinedApi

*/

/** @def FTW_DP

Valid flags for the 3rd argument to the function that is passed as the second argument to ftw(3) and nftw(3).

Directory with subdirectories visited. A file on which stat could not successfully be

executed.

@publishedAll

@externallyDefinedApi

*/

/** @def FTW_NS

Valid flags for the 3rd argument to the function that is passed as the second argument to ftw(3) and nftw(3).

A file on which stat could not successfully be executed.

@publishedAll

@externallyDefinedApi

*/

/** @def FTW_SL

Valid flags for the 3rd argument to the function that is passed as the second argument to ftw(3) and nftw(3).

Symbolic link.

@publishedAll

@externallyDefinedApi

*/

/** @def FTW_SLN

Valid flags for the 3rd argument to the function that is passed as the second argument to ftw(3) and nftw(3).

Sym link that names a nonexistent file. 

@publishedAll

@externallyDefinedApi

*/

/** @def FTW_PHYS	

Flags for use as the 4th argument to nftw(3).  These may be ORed together.

Physical walk, don't follow sym links.

@publishedAll

@released

*/

/** @def FTW_MOUNT			

Flags for use as the 4th argument to nftw(3).  These may be ORed together.

The walk does not cross a mount point.

@publishedAll

@released

*/

/** @def FTW_DEPTH			

Flags for use as the 4th argument to nftw(3).  These may be ORed together.

Subdirs visited before the dir itself. 

@publishedAll

@released

*/

/** @def FTW_CHDIR			

Flags for use as the 4th argument to nftw(3).  These may be ORed together.

Change to a directory before reading it.

@publishedAll

@released

*/