f6d234d870
- varios "new sentence, new line" warnings - varios "sections out of conventional order" warnings - varios "unusual Xr order" warnings - varios "missing section argument" warnings - varios "no blank before trailing delimiter" warnings - varios "normalizing date format" warnings MFC after: 1 month
278 lines
6.3 KiB
Groff
278 lines
6.3 KiB
Groff
.\" SPDX-License-Identifier: BSD-2-Clause
|
|
.\"
|
|
.\" Copyright (c) 2018 Gandi
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd September 23, 2020
|
|
.Dt FHLINK 2
|
|
.Os
|
|
.Sh NAME
|
|
.Nm fhlink ,
|
|
.Nm fhlinkat
|
|
.Nd make a hard file link
|
|
.Sh LIBRARY
|
|
.Lb libc
|
|
.Sh SYNOPSIS
|
|
.In unistd.h
|
|
.Ft int
|
|
.Fn fhlink "fhandle_t *fhp" "const char *to"
|
|
.Ft int
|
|
.Fn fhlinkat "fhandle_t *fhp" "int tofd" "const char *to"
|
|
.Fc
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Fn fhlink
|
|
system call
|
|
atomically creates the specified directory entry (hard link)
|
|
.Fa to
|
|
with the attributes of the underlying object pointed at by
|
|
.Fa fhp .
|
|
If the link is successful: the link count of the underlying object
|
|
is incremented;
|
|
.Fa fhp
|
|
and
|
|
.Fa to
|
|
share equal access and rights
|
|
to the
|
|
underlying object.
|
|
.Pp
|
|
If
|
|
.Fa fhp
|
|
is removed, the file
|
|
.Fa to
|
|
is not deleted and the link count of the
|
|
underlying object is
|
|
decremented.
|
|
.Pp
|
|
The object pointed at by the
|
|
.Fa fhp
|
|
argument
|
|
must exist for the hard link to
|
|
succeed and
|
|
both
|
|
.Fa fhp
|
|
and
|
|
.Fa to
|
|
must be in the same file system.
|
|
The
|
|
.Fa fhp
|
|
argument
|
|
may not be a directory.
|
|
.Pp
|
|
The
|
|
.Fn fhlinkat
|
|
system call is equivalent to
|
|
.Fa fhlink
|
|
except in the case where
|
|
.Fa to
|
|
is a relative paths.
|
|
In this case a relative path
|
|
.Fa to
|
|
is interpreted relative to
|
|
the directory associated with the file descriptor
|
|
.Fa tofd
|
|
instead of the current working directory.
|
|
.Pp
|
|
Values for
|
|
.Fa flag
|
|
are constructed by a bitwise-inclusive OR of flags from the following
|
|
list, defined in
|
|
.In fcntl.h :
|
|
.Bl -tag -width indent
|
|
.It Dv AT_SYMLINK_FOLLOW
|
|
If
|
|
.Fa fhp
|
|
names a symbolic link, a new link for the target of the symbolic link is
|
|
created.
|
|
.It Dv AT_BENEATH
|
|
Only allow to link to a file which is beneath of the topping directory.
|
|
See the description of the
|
|
.Dv O_BENEATH
|
|
flag in the
|
|
.Xr open 2
|
|
manual page.
|
|
.It Dv AT_RESOLVE_BENEATH
|
|
Only walks paths below the topping directory.
|
|
See the description of the
|
|
.Dv O_RESOLVE_BENEATH
|
|
flag in the
|
|
.Xr open 2
|
|
manual page.
|
|
.El
|
|
.Pp
|
|
If
|
|
.Fn fhlinkat
|
|
is passed the special value
|
|
.Dv AT_FDCWD
|
|
in the
|
|
.Fa tofd
|
|
parameter, the current working directory is used for the
|
|
.Fa to
|
|
argument.
|
|
If
|
|
.Fa tofd
|
|
has value
|
|
.Dv AT_FDCWD ,
|
|
the behavior is identical to a call to
|
|
.Fn link .
|
|
Unless
|
|
.Fa flag
|
|
contains the
|
|
.Dv AT_SYMLINK_FOLLOW
|
|
flag, if
|
|
.Fa fhp
|
|
names a symbolic link, a new link is created for the symbolic link
|
|
.Fa fhp
|
|
and not its target.
|
|
.Sh RETURN VALUES
|
|
.Rv -std link
|
|
.Sh ERRORS
|
|
The
|
|
.Fn fhlink
|
|
system call
|
|
will fail and no link will be created if:
|
|
.Bl -tag -width Er
|
|
.It Bq Er ENOTDIR
|
|
A component of
|
|
.Fa to
|
|
prefix is not a directory.
|
|
.It Bq Er ENAMETOOLONG
|
|
A component of
|
|
.Fa to
|
|
exceeded 255 characters,
|
|
or entire length of
|
|
.Fa to
|
|
name exceeded 1023 characters.
|
|
.It Bq Er ENOENT
|
|
A component of
|
|
.Fa to
|
|
prefix does not exist.
|
|
.It Bq Er EOPNOTSUPP
|
|
The file system containing the file pointed at by
|
|
.Fa fhp
|
|
does not support links.
|
|
.It Bq Er EMLINK
|
|
The link count of the file pointed at by
|
|
.Fa fhp
|
|
would exceed 32767.
|
|
.It Bq Er EACCES
|
|
A component of
|
|
.Fa to
|
|
prefix denies search permission.
|
|
.It Bq Er EACCES
|
|
The requested link requires writing in a directory with a mode
|
|
that denies write permission.
|
|
.It Bq Er ELOOP
|
|
Too many symbolic links were encountered in translating one of the pathnames.
|
|
.It Bq Er ENOENT
|
|
The file pointed at by
|
|
.Fa fhp
|
|
does not exist.
|
|
.It Bq Er EEXIST
|
|
The link named by
|
|
.Fa to
|
|
does exist.
|
|
.It Bq Er EPERM
|
|
The file pointed at by
|
|
.Fa fhp
|
|
is a directory.
|
|
.It Bq Er EPERM
|
|
The file pointed at by
|
|
.Fa fhp
|
|
has its immutable or append-only flag set, see the
|
|
.Xr chflags 2
|
|
manual page for more information.
|
|
.It Bq Er EPERM
|
|
The parent directory of the file named by
|
|
.Fa to
|
|
has its immutable flag set.
|
|
.It Bq Er EXDEV
|
|
The link named by
|
|
.Fa to
|
|
and the file pointed at by
|
|
.Fa fhp
|
|
are on different file systems.
|
|
.It Bq Er ENOSPC
|
|
The directory in which the entry for the new link is being placed
|
|
cannot be extended because there is no space left on the file
|
|
system containing the directory.
|
|
.It Bq Er EDQUOT
|
|
The directory in which the entry for the new link
|
|
is being placed cannot be extended because the
|
|
user's quota of disk blocks on the file system
|
|
containing the directory has been exhausted.
|
|
.It Bq Er EIO
|
|
An I/O error occurred while reading from or writing to
|
|
the file system to make the directory entry.
|
|
.It Bq Er EINTEGRITY
|
|
Corrupted data was detected while reading from the file system.
|
|
.It Bq Er EROFS
|
|
The requested link requires writing in a directory on a read-only file
|
|
system.
|
|
.It Bq Er EFAULT
|
|
One of the pathnames specified
|
|
is outside the process's allocated address space.
|
|
.It Bq Er ESTALE
|
|
The file handle
|
|
.Fa fhp
|
|
is no longer valid
|
|
.El
|
|
.Pp
|
|
In addition to the errors returned by the
|
|
.Fn fhlink ,
|
|
the
|
|
.Fn fhlinkat
|
|
system call may fail if:
|
|
.Bl -tag -width Er
|
|
.It Bq Er EBADF
|
|
The
|
|
.Fa fhp
|
|
or
|
|
.Fa to
|
|
argument does not specify an absolute path and the
|
|
.Fa tofd
|
|
argument, is not
|
|
.Dv AT_FDCWD
|
|
nor a valid file descriptor open for searching.
|
|
.It Bq Er EINVAL
|
|
The value of the
|
|
.Fa flag
|
|
argument is not valid.
|
|
.It Bq Er ENOTDIR
|
|
The
|
|
.Fa fhp
|
|
or
|
|
.Fa to
|
|
argument is not an absolute path and
|
|
.Fa tofd
|
|
is not
|
|
.Dv AT_FDCWD
|
|
nor a file descriptor associated with a directory.
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr fhopen 2 ,
|
|
.Xr fhreadlink 2 ,
|
|
.Xr fhstat 2
|