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