210 lines
4.8 KiB
Groff
210 lines
4.8 KiB
Groff
.\" $NetBSD: ftw.3,v 1.3 2006/02/07 19:02:29 wiz Exp $
|
|
.\"
|
|
.\" From OpenBSD: ftw.3,v 1.4 2003/10/30 18:52:58 jmc Exp
|
|
.\"
|
|
.\" Copyright (c) 2003 Todd C. Miller <Todd.Miller@courtesan.com>
|
|
.\"
|
|
.\" Permission to use, copy, modify, and distribute this software for any
|
|
.\" purpose with or without fee is hereby granted, provided that the above
|
|
.\" copyright notice and this permission notice appear in all copies.
|
|
.\"
|
|
.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
|
.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
|
.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
|
.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
|
.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
|
.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
|
|
.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
|
.\"
|
|
.\" Sponsored in part by the Defense Advanced Research Projects
|
|
.\" Agency (DARPA) and Air Force Research Laboratory, Air Force
|
|
.\" Materiel Command, USAF, under agreement number F39502-99-1-0512.
|
|
.\"
|
|
.Dd May 20, 2003
|
|
.Dt FTW 3
|
|
.Os
|
|
.Sh NAME
|
|
.Nm ftw, nftw
|
|
.Nd traverse (walk) a file tree
|
|
.Sh SYNOPSIS
|
|
.In ftw.h
|
|
.Ft int
|
|
.Fo ftw
|
|
.Fa "const char *path"
|
|
.Fa "int (*fn)(const char *, const struct stat *, int)"
|
|
.Fa "int maxfds"
|
|
.Fc
|
|
.Ft int
|
|
.Fo nftw
|
|
.Fa "const char *path"
|
|
.Fa "int (*fn)(const\ char\ *, const\ struct\ stat\ *, int, struct\ FTW\ *)"
|
|
.Fa "int maxfds"
|
|
.Fa "int flags"
|
|
.Fc
|
|
.Sh DESCRIPTION
|
|
.Bf -symbolic
|
|
These functions are provided for compatibility with legacy code.
|
|
New code should use the
|
|
.Xr fts 3
|
|
functions.
|
|
.Ef
|
|
.Pp
|
|
The
|
|
.Fn ftw
|
|
and
|
|
.Fn nftw
|
|
functions traverse (walk) the directory hierarchy rooted in
|
|
.Fa path .
|
|
For each object in the hierarchy, these functions call the function
|
|
pointed to by
|
|
.Fa fn .
|
|
The
|
|
.Fn 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
|
|
.Fn nftw
|
|
function passes the aforementioned arguments plus a pointer to a
|
|
.Dv FTW
|
|
structure as defined by
|
|
.Aq Pa ftw.h
|
|
(shown below):
|
|
.Bd -literal
|
|
struct FTW {
|
|
int base; /* offset of basename into pathname */
|
|
int level; /* directory depth relative to starting point */
|
|
};
|
|
.Ed
|
|
.Pp
|
|
Possible values for the flag passed to
|
|
.Fa fn
|
|
are:
|
|
.Bl -tag -width FTW_DNR
|
|
.It Dv FTW_F
|
|
A regular file.
|
|
.It Dv FTW_D
|
|
A directory being visited in pre-order.
|
|
.It Dv FTW_DNR
|
|
A directory which cannot be read.
|
|
The directory will not be descended into.
|
|
.It Dv FTW_DP
|
|
A directory being visited in post-order
|
|
.Pq Fn nftw No only .
|
|
.It Dv FTW_NS
|
|
A file for which no
|
|
.Xr stat 2
|
|
information was available.
|
|
The contents of the stat structure are undefined.
|
|
.It Dv FTW_SL
|
|
A symbolic link.
|
|
.It Dv FTW_SLN
|
|
A symbolic link with a non-existent target
|
|
.Pq Fn nftw No only .
|
|
.El
|
|
.Pp
|
|
The
|
|
.Fn ftw
|
|
function traverses the tree in pre-order.
|
|
That is, it processes the directory before the directory's contents.
|
|
.Pp
|
|
The
|
|
.Fa maxfds
|
|
argument specifies the maximum number of file descriptors
|
|
to keep open while traversing the tree.
|
|
It has no effect in this implementation.
|
|
.Pp
|
|
The
|
|
.Fn nftw
|
|
function has an additional
|
|
.Fa flags
|
|
argument with the following possible values:
|
|
.Bl -tag -width FTW_MOUNT
|
|
.It Dv FTW_PHYS
|
|
Physical walk, don't follow symbolic links.
|
|
.It Dv FTW_MOUNT
|
|
The walk will not cross a mount point.
|
|
.It FTW_DEPTH
|
|
Process directories in post-order.
|
|
Contents of a directory are visited before the directory itself.
|
|
By default,
|
|
.Fn nftw
|
|
traverses the tree in pre-order.
|
|
.It FTW_CHDIR
|
|
Change to a directory before reading it.
|
|
By default,
|
|
.Fn nftw
|
|
will change its starting directory.
|
|
The current working directory will be restored to its original value before
|
|
.Fn nftw
|
|
returns.
|
|
.El
|
|
.Sh RETURN VALUES
|
|
If the tree was traversed successfully, the
|
|
.Fn ftw
|
|
and
|
|
.Fn nftw
|
|
functions return 0.
|
|
If the function pointed to by
|
|
.Fa fn
|
|
returns a non-zero value,
|
|
.Fn ftw
|
|
and
|
|
.Fn nftw
|
|
will stop processing the tree and return the value from
|
|
.Fa fn .
|
|
Both functions return \-1 if an error is detected.
|
|
.Sh ERRORS
|
|
The
|
|
.Fn ftw
|
|
and
|
|
.Fn nftw
|
|
functions may fail and set
|
|
.Va errno
|
|
for any of the errors specified for the library functions
|
|
.Xr close 2 ,
|
|
.Xr open 2 ,
|
|
.Xr stat 2 ,
|
|
.Xr malloc 3 ,
|
|
.Xr opendir 3 ,
|
|
and
|
|
.Xr readdir 3 .
|
|
If the
|
|
.Dv FGTW_CHDIR
|
|
flag is set, the
|
|
.Fn nftw
|
|
function may fail and set
|
|
.Va errno
|
|
for any of the errors specified for
|
|
.Xr chdir 2 .
|
|
In addition, either function may fail and set
|
|
.Va errno
|
|
as follows:
|
|
.Bl -tag -width Er
|
|
.It Bq Er EINVAL
|
|
The
|
|
.Fa maxfds
|
|
argument is less than 1 or greater than
|
|
.Dv OPEN_MAX .
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr chdir 2 ,
|
|
.Xr close 2 ,
|
|
.Xr open 2 ,
|
|
.Xr stat 2 ,
|
|
.Xr fts 3 ,
|
|
.Xr malloc 3 ,
|
|
.Xr opendir 3 ,
|
|
.Xr readdir 3
|
|
.Sh STANDARDS
|
|
The
|
|
.Fn ftw
|
|
and
|
|
.Fn nftw
|
|
functions conform to
|
|
.St -p1003.1-2001 .
|
|
.Sh BUGS
|
|
The
|
|
.Fa maxfds
|
|
argument is currently ignored.
|