rename - change the name of a file
int rename(const char *from, const char *to)
Rename causes the link named from to be renamed as to. If to exists,
then it is first removed. Both from and to must be of the same type
(that is, both directories or both non-directories), and must reside on
the same file system.
Rename guarantees that an instance of to will always exist, even if the
system should crash in the middle of the operation.
If the final component of from is a symbolic link, the symbolic link is
renamed, not the file or directory to which it points.
A 0 value is returned if the operation succeeds, otherwise rename returns
-1 and the global variable errno indicates the reason for the failure.
Rename will fail and neither of the argument files will be affected if
any of the following are true:
[ENAMETOOLONG] A path name exceeds PATH_MAX characters.
[ENOENT] A component of the from path does not exist, or a path
prefix of to does not exist.
[EACCES] A component of either path prefix denies search
[EACCES] The requested link requires writing in a directory with a
mode that denies write permission.
[EPERM] The directory containing from is marked sticky, and
neither the containing directory nor from are owned by the
effective user ID.
[EPERM] The to file exists, the directory containing to is marked
sticky, and neither the containing directory nor to are
owned by the effective user ID.
[ELOOP] Too many symbolic links were encountered in translating
either pathname. (Minix-vmd)
[ENOTDIR] A component of either path prefix is not a directory.
[ENOTDIR] From is a directory, but to is not a directory.
[EISDIR] To is a directory, but from is not a directory.
[EXDEV] The link named by to and the file named by from are on
different logical devices (file systems).
[ENOSPC] The directory in which the entry for the new name is being
placed cannot be extended because there is no space left
on the file system containing the directory.
[EIO] An I/O error occurred while making or updating a directory
[EROFS] The requested link requires writing in a directory on a
read-only file system.
[EFAULT] Path points outside the process's allocated address space.
[EINVAL] From is a parent directory of to, or an attempt is made to
rename ``.'' or ``..''.
[ENOTEMPTY] To is a directory and is not empty.