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-.\" 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 February 23, 2021
-.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
-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