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           #include <stdio.h>
           int rename(const char *oldpath, const char *newpath);
           #include <fcntl.h>           /* Definition of AT_* constants */
           #include <stdio.h>
           int renameat(int olddirfd, const char *oldpath,
                        int newdirfd, const char *newpath);
       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:


           rename()  renames  a  file,  moving it between directories if required.
           Any other hard links to the file (as created using link(2))  are  unaf-
           fected.  Open file descriptors for oldpath are also unaffected.
           If newpath already exists, it will be atomically replaced (subject to a
           few conditions; see ERRORS below), so that there is no point  at  which
           another process attempting to access newpath will find it missing.
           If  oldpath  and  newpath are existing hard links referring to the same
           file, then rename() does nothing, and returns a success status.
           If newpath exists but the operation fails  for  some  reason,  rename()
           guarantees to leave an instance of newpath in place.
           oldpath can specify a directory.  In this case, newpath must either not
           exist, or it must specify an empty directory.
           However, when overwriting there will probably be a window in which both
           oldpath and newpath refer to the file being renamed.
           If  oldpath  refers to a symbolic link, the link is renamed; if newpath
           refers to a symbolic link, the link will be overwritten.
       renameat ()
           The renameat()  system  call  operates  in  exactly  the  same  way  as
           rename(), 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 rename() for a relative pathname).
           set appropriately.


           EACCES Write  permission is denied for the directory containing oldpath
                  or newpath, or, search permission  is  denied  for  one  of  the
                  directories in the path prefix of oldpath or newpath, or oldpath
                  is a directory and does not allow write  permission  (needed  to
                  update the ..  entry).  (See also path_resolution(7).)
           EBUSY  The  rename fails because oldpath or newpath is a directory that
                  is in use by some process (perhaps as current working directory,
                  or  as root directory, or because it was open for reading) or is
                  in use by the system (for example as  mount  point),  while  the
                  system considers this an error.  (Note that there is no require-
                  ment to return EBUSY in such cases--there is nothing  wrong  with
                  doing the rename anyway--but it is allowed to return EBUSY if the
                  system cannot otherwise handle such situations.)
           EDQUOT The user's quota of disk  blocks  on  the  filesystem  has  been
           EFAULT oldpath or newpath points outside your accessible address space.
           EINVAL The new pathname contained a path prefix of the  old,  or,  more
                  generally,  an  attempt was made to make a directory a subdirec-
                  tory of itself.
           EISDIR newpath is an existing directory, but oldpath is  not  a  direc-
           ELOOP  Too many symbolic links were encountered in resolving oldpath or
           EMLINK oldpath already has the maximum number of links to it, or it was
                  a directory and the directory containing newpath has the maximum
                  number of links.
                  oldpath or newpath was too long.
           ENOENT The link named by oldpath does not exist; or, a directory compo-
                  nent  in  newpath  does  not exist; or, oldpath or newpath is an
                  empty string.
           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.  Or, oldpath  is  a  directory,  and  newpath
                  replaced  nor  that of the directory containing it, and the pro-
                  cess is not privileged (Linux:  does  not  have  the  CAP_FOWNER
                  capability); or the filesystem containing pathname does not sup-
                  port renaming of the type requested.
           EROFS  The file is on a read-only filesystem.
           EXDEV  oldpath and newpath are not  on  the  same  mounted  filesystem.
                  (Linux  permits  a  filesystem to be mounted at multiple points,
                  but rename() does not work across different mount  points,  even
                  if the same filesystem is mounted on both.)
           The following additional errors can occur for renameat():
           EBADF  olddirfd or newdirfd is not a valid file descriptor.
                  oldpath  is relative and olddirfd is a file descriptor referring
                  to a file other than a directory; or  similar  for  newpath  and


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


           rename(): 4.3BSD, C89, C99, POSIX.1-2001, POSIX.1-2008.
           renameat(): POSIX.1-2008.


           On NFS filesystems, you can not assume that if  the  operation  failed,
           the  file was not renamed.  If the server does the rename operation and
           then crashes, the retransmitted RPC which will be  processed  when  the
           server  is  up  again causes a failure.  The application is expected to
           deal with this.  See link(2) for a similar problem.


           mv(1), chmod(2), link(2),  symlink(2),  unlink(2),  path_resolution(7),

    Linux 2014-02-21 RENAME(2)


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