##### rename

Synopsis:

                int rename(const char *oldpath, const char *newpath);

Request:
  ‘`Frename,oldpathptr/len,newpathptr/len`’
Return value:
  On success, zero is returned. On error, -1 is returned.
Errors:
  `EISDIR`
    newpath is an existing directory, but oldpath is not a directory.
  `EEXIST`
    newpath is a non-empty directory.
  `EBUSY`
    oldpath or newpath is a directory that is in use by some process.
  `EINVAL`
    An attempt was made to make a directory a subdirectory of itself.
  `ENOTDIR`
    A component used as a directory in oldpath or new path is not a directory. Or oldpath is a directory and newpath exists but is not a directory.
  `EFAULT`
    oldpathptr or newpathptr are invalid pointer values.
  `EACCES`
    No access to the file or the path of the file.
  `ENAMETOOLONG`
    oldpath or newpath was too long.
  `ENOENT`
    A directory component in oldpath or newpath does not exist.
  `EROFS`
    The file is on a read-only filesystem.
  `ENOSPC`
    The device containing the file has no room for the new directory entry.
  `EINTR`
    The call was interrupted by the user.