7 iocall(Ioproc *io, long (*op)(va_list*), ...)  in iocall()  argument
12 	if(send(io->c, &io) == -1){  in iocall()
16 	assert(!io->inuse);  in iocall()
17 	io->inuse = 1;  in iocall()
18 	io->op = op;  in iocall()
19 	va_start(io->arg, op);  in iocall()
20 	msg = io;  in iocall()
22 	while(send(io->creply, &msg) == -1){  in iocall()
37 	while(recv(io->creply, nil) == -1){  in iocall()
39 		iointerrupt(io);  in iocall()
42 	va_end(io->arg);  in iocall()
43 	ret = io->ret;  in iocall()
45 		errstr(io->err, sizeof io->err);  in iocall()
46 	io->inuse = 0;  in iocall()
49 	while(send(io->creply, &io) == -1)  in iocall()