slurmrestd - unlink named unix sockets before closing.

Bug 9222.

NEWS

@@ -24,6 +24,7 @@ documents those changes that are of interest to users and administrators.
     authentication is ill-formed.
  -- slurmrestd - restrict ability of requests to use different authentication
     plugins.
+ -- slurmrestd - unlink named unix sockets before closing.
 * Changes in Slurm 20.02.3
 ==========================

src/slurmrestd/conmgr.c

@@ -355,6 +355,11 @@ static void _close_con(bool locked, con_mgr_fd_t *con)
 		_check_magic_mgr(con->mgr);
 	}
 
+	/* unlink socket to avoid leaving ghost socket */
+	if (con->unix_socket && (unlink(con->unix_socket) == -1))
+		error("%s: unable to unlink %s: %m",
+		      __func__, con->unix_socket);
+
 	/* mark it as EOF even if it hasn't */
 	con->read_eof = true;