readv
device_readv_hook readv;
ssize_t readv(int fd, const struct iovec *vector, int count);
op_readv *readv;
beos_op_readv *readv;
# define haiku_host_platform_readv readv
# define haiku_host_platform_readv readv
bytes = readv(fd, str->iovCur, str->iovCurCount);
return readv(fd, systemVecs, count);