On Thu, Oct 22, 2020 at 04:35:17PM +0000, David Laight wrote: > Wait... > readv(2) defines: > ssize_t readv(int fd, const struct iovec *iov, int iovcnt); It doesn't really matter what the manpage says. What does the AOSP libc header say? > But the syscall is defined as: > > SYSCALL_DEFINE3(readv, unsigned long, fd, const struct iovec __user *, vec, > unsigned long, vlen) > { > return do_readv(fd, vec, vlen, 0); > }