iov              2993 gc/os_dep.c    	    struct iovec iov;
iov              2995 gc/os_dep.c    	    iov.iov_base = buf;
iov              2996 gc/os_dep.c    	    iov.iov_len = nbyte;
iov              2997 gc/os_dep.c    	    result = readv(fd, &iov, 1);