C++ (Cpp) linux_poll Examples

Example #1

File: linux_console.c Project: 3a9LL/panda

static int linux_console_iskey()
{
	struct pollfd pfd;
	pfd.fd = 0;
	pfd.events = POLLIN;

	/* poll for data to be read on stdin */
	if (linux_poll(&pfd, 1, 0) == -1) {
		DBG("linux_console poll failed (%s)\n", linux_strerror(linux_errno));
		return 0;
	}

	if (pfd.revents & POLLIN)
		return 1;
	else
		return 0;
}

Example #2

File: af_packet.c Project: antonym/ipxe

/** Poll for new packets */
static void af_packet_nic_poll ( struct net_device *netdev )
{
	struct af_packet_nic * nic = netdev->priv;
	struct pollfd pfd;
	struct io_buffer * iobuf;
	int r;

	pfd.fd = nic->fd;
	pfd.events = POLLIN;
	if (linux_poll(&pfd, 1, 0) == -1) {
		DBGC(nic, "af_packet %p poll failed (%s)\n",
		     nic, linux_strerror(linux_errno));
		return;
	}
	if ((pfd.revents & POLLIN) == 0)
		return;

	/* At this point we know there is at least one new packet to be read */

	iobuf = alloc_iob(RX_BUF_SIZE);
	if (! iobuf)
		goto allocfail;

	while ((r = linux_read(nic->fd, iobuf->data, RX_BUF_SIZE)) > 0) {
		DBGC2(nic, "af_packet %p read %d bytes\n", nic, r);

		iob_put(iobuf, r);
		netdev_rx(netdev, iobuf);

		iobuf = alloc_iob(RX_BUF_SIZE);
		if (! iobuf)
			goto allocfail;
	}

	free_iob(iobuf);
	return;

allocfail:
	DBGC(nic, "af_packet %p alloc_iob failed\n", nic);
}