int
ftw(
const char *path
int (*fn)(const char *, const struct stat *, int)
int maxfds
)
int
nftw(
const char *path
int (*fn)(const char *, const struct stat *, int, struct FTW *)
int maxfds
int flags
)
The
ftw()
and
nftw(
)
functions traverse (walk) the directory hierarchy rooted in
path
.
For each object in the hierarchy, these functions call the function
pointed to by
fn
.
The
ftw()
function passes this function a pointer to a NUL-terminated string containing
the name of the object, a pointer to a stat structure corresponding to the
object, and an integer flag.
The
nftw(
)
function passes the aforementioned arguments plus a pointer to a
FTW
structure as defined by
<ftw.h
>
(shown below):
struct FTW {
int base; /* offset of basename into pathname */
int level; /* directory depth relative to starting point */
};
Possible values for the flag passed to
fn
are:
FTW_F
FTW_D
FTW_DNR
FTW_DP
only)).
FTW_NS
FTW_SL
FTW_SLN
only)).
The
ftw()
function traverses the tree in pre-order.
That is, it processes the directory before the directory's contents.
The
maxfds
argument specifies the maximum number of file descriptors
to keep open while traversing the tree.
It has no effect in this implementation.
The
nftw()
function has an additional
flags
argument with the following possible values:
FTW_PHYS
FTW_MOUNT
)
traverses the tree in pre-order.
)
will change its starting directory.
The current working directory will be restored to its original value before
nftw(
)
returns.
)
and
nftw(
)
functions return 0.
If the function pointed to by
fn
returns a non-zero value,
ftw(
)
and
nftw(
)
will stop processing the tree and return the value from
fn
.
Both functions return -1 if an error is detected.
)
and
nftw(
)
functions may fail and set
errno
for any of the errors specified for the library functions
close(2),
open(2),
stat(2),
malloc(3),
opendir(3),
and
readdir(3).
If the
FGTW_CHDIR
flag is set, the
nftw(
)
function may fail and set
errno
for any of the errors specified for
chdir(2).
In addition, either function may fail and set
errno
as follows:
EINVAL
]
maxfds
argument is less than 1 or greater than
OPEN_MAX
.
)
and
nftw(
)
functions conform to
IEEE Std 1003.1-2001 (``POSIX.1'') .
maxfds
argument is currently ignored.