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/usr/include/x86_64-linux-musl/ftw.h is in musl-dev 0.9.15-1.

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#ifndef _FTW_H
#define	_FTW_H

#ifdef __cplusplus
extern "C" {
#endif

#include <features.h>
#include <sys/stat.h>

#define FTW_F   1
#define FTW_D   2
#define FTW_DNR 3
#define FTW_NS  4
#define FTW_SL  5
#define FTW_DP  6
#define FTW_SLN 7

#define FTW_PHYS  1
#define FTW_MOUNT 2
#define FTW_CHDIR 4
#define FTW_DEPTH 8

struct FTW
{
	int base;
	int level;
};

int ftw(const char *, int (*)(const char *, const struct stat *, int), int);
int nftw(const char *, int (*)(const char *, const struct stat *, int, struct FTW *), int, int);

#if defined(_LARGEFILE64_SOURCE) || defined(_GNU_SOURCE)
#define ftw64 ftw
#define nftw64 nftw
#endif

#ifdef __cplusplus
}
#endif

#endif