The named file is removed unless:
[ENOTDIR]
A component of the path is not a directory.
[ENAMETOOLONG]
A component of a pathname exceeded {NAME_MAX} characters, or an entire path name exceeded {PATH_MAX} characters.
[ENOENT]
The named directory does not exist.
[ELOOP]
Too many symbolic links were encountered in translating the pathname.
[ENOTEMPTY]
The named directory contains files other than ‘.' and ‘..' in it.
[EACCES]
Search permission is denied for a component of the path prefix, or write permission is denied on the directory containing the link to be removed.
[EPERM]
The directory containing the directory to be removed is marked sticky, and neither the containing directory nor the directory to be removed are owned by the effective user ID.
[EBUSY]
The directory to be removed is the mount point for a mounted file system.
[EIO]
An I/O error occurred while deleting the directory entry or deallocating the inode.
[EROFS]
The directory entry to be removed resides on a read-only file system.
[EFAULT]
path points outside the process's allocated address space.