RENAME(2)
NAME
rename − change the name of a file
USAGE
rename(from, to) char *from, *to;
DESCRIPTION
Rename causes the link named from to be renamed with name to. If a file named to existed before the call to rename, it is removed. Both from and to must be objects of the same type (that is, both directories or both non-directories), and both 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.
RETURN VALUE
A successful call returns zero. A failed call returns -1 and sets errno as indicated below.
ERRORS
Rename will fail and neither of the argument files will be affected if any of the following are true:
[ENOTDIR] A component of either path prefix is not a directory.
[ENOENT] A component of either path prefix does not exist.
[EACCES] A component of either path prefix denies search permission.
[ENOENT] The file named by from does not exist.
[EPERM] The file named by from is a directory and the effective user ID is not super-user.
[EXDEV] The link named by to and the file named by from are on different logical devices (i.e., file systems). Note that this error code will not be returned if the implementation permits cross-device links.
[EACCES] The requested link requires writing in a directory with a mode that denies write permission.
[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.