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           #include <unistd.h>
           int link(const char *oldpath, const char *newpath);
           #include <fcntl.h>           /* Definition of AT_* constants */
           #include <unistd.h>
           int linkat(int olddirfd, const char *oldpath,
                      int newdirfd, const char *newpath, int flags);
       Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
               Since glibc 2.10:
                   _XOPEN_SOURCE >= 700 || _POSIX_C_SOURCE >= 200809L
               Before glibc 2.10:


           link()  creates  a  new link (also known as a hard link) to an existing
           If newpath exists it will not be overwritten.
           This new name may be used exactly as the old  one  for  any  operation;
           both names refer to the same file (and so have the same permissions and
           ownership) and it is impossible to tell which name was the  "original".
           The  linkat()  system  call operates in exactly the same way as link(),
           except for the differences described here.
           If the pathname given in oldpath is relative, then  it  is  interpreted
           relative  to  the directory referred to by the file descriptor olddirfd
           (rather than relative to the current working directory of  the  calling
           process, as is done by link() for a relative pathname).
           If oldpath is relative and olddirfd is the special value AT_FDCWD, then
           oldpath is interpreted relative to the current working directory of the
           calling process (like link()).
           If oldpath is absolute, then olddirfd is ignored.
           The interpretation of newpath is as for oldpath, except that a relative
           pathname is interpreted relative to the directory referred  to  by  the
           file descriptor newdirfd.
           The following values can be bitwise ORed in flags:
           AT_EMPTY_PATH (since Linux 2.6.39)
                  If  oldpath is an empty string, create a link to the file refer-
           Before kernel 2.6.18, the flags argument was  unused,  and  had  to  be
           specified as 0.
           See openat(2) for an explanation of the need for linkat().


           On  success,  zero is returned.  On error, -1 is returned, and errno is
           set appropriately.


           EACCES Write access to the directory containing newpath is  denied,  or
                  search  permission  is  denied for one of the directories in the
                  path prefix of  oldpath  or  newpath.   (See  also  path_resolu-
           EDQUOT The  user's  quota  of  disk  blocks  on the filesystem has been
           EEXIST newpath already exists.
           EFAULT oldpath or newpath points outside your accessible address space.
           EIO    An I/O error occurred.
           ELOOP  Too many symbolic links were encountered in resolving oldpath or
           EMLINK The file referred to by oldpath already has the  maximum  number
                  of links to it.
                  oldpath or newpath was too long.
           ENOENT A directory component in oldpath or newpath does not exist or is
                  a dangling symbolic link.
           ENOMEM Insufficient kernel memory was available.
           ENOSPC The device containing the file has no room for the new directory
                  A component used as a directory in oldpath or newpath is not, in
                  fact, a directory.
           EPERM  oldpath is a directory.
           EPERM  The filesystem containing oldpath and newpath does  not  support
                  the creation of hard links.
           EPERM (since Linux 3.6)
           EINVAL An invalid flag value was specified in flags.
           ENOENT AT_EMPTY_PATH was specified in flags, but  the  caller  did  not
                  have the CAP_DAC_READ_SEARCH capability.
           ENOENT An  attempt was made to link to the /proc/self/fd/NN file corre-
                  sponding to a file descriptor created with
                      open(path, O_TMPFILE | O_EXCL, mode);
                  See open(2).
                  oldpath is relative and olddirfd is a file descriptor  referring
                  to  a  file  other  than a directory; or similar for newpath and
           EPERM  AT_EMPTY_PATH was  specified  in  flags,  oldpath  is  an  empty
                  string, and olddirfd refers to a directory.


           linkat() was added to Linux in kernel 2.6.16; library support was added
           to glibc in version 2.4.


           link(): SVr4, 4.3BSD, POSIX.1-2001 (but see NOTES), POSIX.1-2008.
           linkat(): POSIX.1-2008.


           Hard links, as created by link(), cannot span  filesystems.   Use  sym-
           link(2) if this is required.
           POSIX.1-2001  says  that  link()  should dereference oldpath if it is a
           symbolic link.  However, since kernel 2.0, Linux does  not  do  so:  if
           oldpath is a symbolic link, then newpath is created as a (hard) link to
           the same symbolic link file (i.e., newpath becomes a symbolic  link  to
           the  same  file  that  oldpath  refers to).  Some other implementations
           behave in the same manner as Linux.  POSIX.1-2008 changes the  specifi-
           cation  of  link(),  making  it implementation-dependent whether or not
           oldpath is dereferenced if it is a symbolic link.  For precise  control
           over  the  treatment  of  symbolic  links  when  creating  a  link, use


           On NFS filesystems, the return code may be wrong in case the NFS server
           performs  the link creation and dies before it can say so.  Use stat(2)
           to find out if the link got created.


           ln(1), open(2), rename(2), stat(2), symlink(2), unlink(2), path_resolu-

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