ftw-h.md - Openharmony v1.0 / docs / api / api-SmartVision-Devices - 最全华为鸿蒙分布式操作系统技术资料库，手册，指南

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# ftw.h
## **Overview**
**Related Modules:**
[FS](FS.md)
**Description:**
Provides functions and structures related to file tree traversal.
You can use the functions and structures to traverse files in a specified directory to obtain or process related information.
**Since:**
1.0
**Version:**
1.0
## **Summary**
## Data Structures

Data Structure Name	Description
FTW	Defines the file tree walker (FTW).

## Macros

Macro Name and Value	Description
FTW_F 1	Regular file.
FTW_D 2	Directory.
FTW_DNR 3	Unreadable directory. Its subdirectories will not be traversed.
FTW_NS 4	The data of the stat structure cannot be obtained. The possible cause is that the permission is incorrect.
FTW_SL 5	Symbolic link.
FTW_DP 6
FTW_SLN 7	Symbolic link that names a non-existent file.
FTW_PHYS 1	Symbolic links that are not traversed. If not set, symbolic links are traversed by default.
FTW_MOUNT 2	Stay within the same file system.
FTW_CHDIR 4	chdir is called to go to the directory before reading the directory.
FTW_DEPTH 8	All subdirectories will be traversed before the directory itself.

## Functions

Function Name	Description
ftw (const char path, int(fn)(const char file, const struct stat sb, int flag), int depth)	int Traverses a file tree.
nftw (const char path, int(fn)(const char file, const struct stat sb, int flag, struct FTW *s), int fd_limit, int flags)	int Traverses a file tree.

Function Name

Description

ftw (const char *path, int(*fn)(const char *file, const struct stat *sb, int flag), int depth)

int

Traverses a file tree.

nftw (const char *path, int(*fn)(const char *file, const struct stat *sb, int flag, struct FTW *s), int fd_limit, int flags)

int

Traverses a file tree.