.\" Copyright (c) 1980, 1991, 1993.\"	The Regents of the University of California.  All rights reserved..\".\" 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..\" 3. All advertising materials mentioning features or use of this software.\"    must display the following acknowledgement:.\"	This product includes software developed by the University of.\"	California, Berkeley and its contributors..\" 4. Neither the name of the University nor the names of its contributors.\"    may be used to endorse or promote products derived from this software.\"    without specific prior written permission..\".\" THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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..\".\"     @(#)link.2	8.3 (Berkeley) 1/12/94.\".Dd January 12, 1994.Dt LINK 2.Os BSD 4.Sh NAME.Nm link.Nd make a hard file link.Sh SYNOPSIS.Fd #include <unistd.h>.Ft int.Fn link "const char *name1" "const char *name2".Sh DESCRIPTIONThe.Fn linkfunction callatomically creates the specified directory entry (hard link).Fa name2with the attributes of the underlying object pointed at by.Fa name1If the link is successful: the link count of the underlying objectis incremented;.Fa name1and.Fa name2share equal access and rightsto theunderlying object..PpIf.Fa name1is removed, the file.Fa name2is not deleted and the link count of theunderlying object isdecremented..Pp.Fa Name1must exist for the hard link tosucceed andboth.Fa name1and.Fa name2must be in the same file system.Unless the caller is the super-user,.Fa name1may not be a directory..Sh RETURN VALUESUpon successful completion, a value of 0 is returned.  Otherwise,a value of -1 is returned and.Va errnois set to indicate the error..Sh ERRORS.Fn Linkwill fail and no link will be created if:.Bl -tag -width Ar.It Bq Er ENOTDIRA component of either path prefix is not a directory..It Bq Er EINVALEither pathname contains a character with the high-order bit set..It Bq Er ENAMETOOLONGA component of either pathname exceeded 255 characters,or entire length of either path name exceeded 1023 characters..It Bq Er ENOENTA component of either path prefix does not exist..It Bq Er EACCESA component of either path prefix denies search permission..It Bq Er EACCESThe requested link requires writing in a directory with a modethat denies write permission..It Bq Er ELOOPToo many symbolic links were encountered in translating one of the pathnames..It Bq Er ENOENTThe file named by.Fa name1does not exist..It Bq Er EEXISTThe link named by.Fa name2does exist..It Bq Er EPERMThe file named by.Fa name1is a directory and the effectiveuser ID is not super-user..It Bq Er EXDEVThe link named by.Fa name2and the file named by.Fa name1are on different file systems..It Bq Er ENOSPCThe directory in which the entry for the new link is being placedcannot be extended because there is no space left on the filesystem containing the directory..ne 3v.It Bq Er EDQUOTThe directory in which the entry for the new linkis being placed cannot be extended because theuser's quota of disk blocks on the file systemcontaining the directory has been exhausted..It Bq Er EIOAn I/O error occurred while reading from or writing to the file system to make the directory entry..It Bq Er EROFSThe requested link requires writing in a directory on a read-only filesystem..It Bq Er EFAULTOne of the pathnames specifiedis outside the process's allocated address space..El.Sh SEE ALSO.Xr symlink 2 ,.Xr unlink 2.Sh STANDARDS.Fn Linkis expected toconform to IEEE Std 1003.1-1988.Pq Dq Tn POSIX .