if (r!=1) serv_syscallfail("write synch byte to parent");
r= synchread(synchsocket[1],'g');
if (r) serv_syscallfail("reach synch byte from parent");
+ if (close(synchsocket[1])) serv_syscallfail("close our synch socket");
if (close(clientfd)) serv_syscallfail("close client socket fd");