[lttng-tools.git] / src / common / sessiond-comm / inet6.c

/*
 * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License, version 2 only, as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 51
 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#define _LGPL_SOURCE
#include <assert.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <common/compat/time.h>
#include <poll.h>

#include <common/common.h>
#include <common/time.h>

#include "inet6.h"

#define RECONNECT_DELAY	200	/* ms */

/*
 * INET protocol operations.
 */
static const struct lttcomm_proto_ops inet6_ops = {
	.bind = lttcomm_bind_inet6_sock,
	.close = lttcomm_close_inet6_sock,
	.connect = lttcomm_connect_inet6_sock,
	.accept = lttcomm_accept_inet6_sock,
	.listen = lttcomm_listen_inet6_sock,
	.recvmsg = lttcomm_recvmsg_inet6_sock,
	.sendmsg = lttcomm_sendmsg_inet6_sock,
};

/*
 * Creates an PF_INET socket.
 */
LTTNG_HIDDEN
int lttcomm_create_inet6_sock(struct lttcomm_sock *sock, int type, int proto)
{
	int val = 1, ret;
	unsigned long timeout;

	/* Create server socket */
	if ((sock->fd = socket(PF_INET6, type, proto)) < 0) {
		PERROR("socket inet6");
		goto error;
	}

	sock->ops = &inet6_ops;

	/*
	 * Set socket option to reuse the address.
	 */
	ret = setsockopt(sock->fd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(int));
	if (ret < 0) {
		PERROR("setsockopt inet6");
		goto error;
	}
	timeout = lttcomm_get_network_timeout();
	if (timeout) {
		ret = lttcomm_setsockopt_rcv_timeout(sock->fd, timeout);
		if (ret) {
			goto error;
		}
		ret = lttcomm_setsockopt_snd_timeout(sock->fd, timeout);
		if (ret) {
			goto error;
		}
	}

	return 0;

error:
	return -1;
}

/*
 * Bind socket and return.
 */
LTTNG_HIDDEN
int lttcomm_bind_inet6_sock(struct lttcomm_sock *sock)
{
	int ret;

	ret = bind(sock->fd, (const struct sockaddr *) &sock->sockaddr.addr.sin6,
			sizeof(sock->sockaddr.addr.sin6));
	if (ret < 0) {
		PERROR("bind inet6");
	}

	return ret;
}

static
int connect_no_timeout(struct lttcomm_sock *sock)
{
	return connect(sock->fd, (struct sockaddr *) &sock->sockaddr.addr.sin6,
			sizeof(sock->sockaddr.addr.sin6));
}

/*
 * Return time_a - time_b  in milliseconds.
 */
static
unsigned long time_diff_ms(struct timespec *time_a,
		struct timespec *time_b)
{
	time_t sec_diff;
	long nsec_diff;
	unsigned long result_ms;

	sec_diff = time_a->tv_sec - time_b->tv_sec;
	nsec_diff = time_a->tv_nsec - time_b->tv_nsec;

	result_ms = sec_diff * MSEC_PER_SEC;
	result_ms += nsec_diff / NSEC_PER_MSEC;
	return result_ms;
}

static
int connect_with_timeout(struct lttcomm_sock *sock)
{
	unsigned long timeout = lttcomm_get_network_timeout();
	int ret, flags, connect_ret;
	struct timespec orig_time, cur_time;

	ret = fcntl(sock->fd, F_GETFL, 0);
	if (ret == -1) {
		PERROR("fcntl");
		return -1;
	}
	flags = ret;

	/* Set socket to nonblock */
	ret = fcntl(sock->fd, F_SETFL, flags | O_NONBLOCK);
	if (ret == -1) {
		PERROR("fcntl");
		return -1;
	}

	ret = lttng_clock_gettime(CLOCK_MONOTONIC, &orig_time);
	if (ret == -1) {
		PERROR("clock_gettime");
		return -1;
	}

	connect_ret = connect(sock->fd,
		(struct sockaddr *) &sock->sockaddr.addr.sin6,
		sizeof(sock->sockaddr.addr.sin6));
	if (connect_ret == -1 && errno != EAGAIN
			&& errno != EWOULDBLOCK
			&& errno != EINPROGRESS) {
		goto error;
	} else if (!connect_ret) {
		/* Connect succeeded */
		goto success;
	}

	DBG("Asynchronous connect for sock %d, performing polling with"
			" timeout: %lums", sock->fd, timeout);

	/*
	 * Perform poll loop following EINPROGRESS recommendation from
	 * connect(2) man page.
	 */
	do {
		struct pollfd fds;

		fds.fd = sock->fd;
		fds.events = POLLOUT;
		fds.revents = 0;
		ret = poll(&fds, 1, RECONNECT_DELAY);
		if (ret < 0) {
			goto error;
		} else if (ret > 0) {
			int optval;
			socklen_t optval_len = sizeof(optval);

			if (!(fds.revents & POLLOUT)) {
				/* Either hup or error */
				errno = EPIPE;
				goto error;
			}
			/* got something */
			ret = getsockopt(sock->fd, SOL_SOCKET,
				SO_ERROR, &optval, &optval_len);
			if (ret) {
				PERROR("getsockopt");
				goto error;
			}
			if (!optval) {
				connect_ret = 0;
				goto success;
			} else {
				/* Get actual connect() errno from opt_val */
				errno = optval;
				goto error;
			}
		}
		/* ret == 0: timeout */
		ret = lttng_clock_gettime(CLOCK_MONOTONIC, &cur_time);
		if (ret == -1) {
			PERROR("clock_gettime");
			connect_ret = ret;
			goto error;
		}
	} while (time_diff_ms(&cur_time, &orig_time) < timeout);

	/* Timeout */
	errno = ETIMEDOUT;
	connect_ret = -1;

success:
	/* Restore initial flags */
	ret = fcntl(sock->fd, F_SETFL, flags);
	if (ret == -1) {
		PERROR("fcntl");
		/* Continue anyway */
	}
error:
	return connect_ret;
}

/*
 * Connect PF_INET socket.
 */
LTTNG_HIDDEN
int lttcomm_connect_inet6_sock(struct lttcomm_sock *sock)
{
	int ret, closeret;

	if (lttcomm_get_network_timeout()) {
		ret = connect_with_timeout(sock);
	} else {
		ret = connect_no_timeout(sock);
	}
	if (ret < 0) {
		PERROR("connect inet6");
		goto error_connect;
	}

	return ret;

error_connect:
	closeret = close(sock->fd);
	if (closeret) {
		PERROR("close inet6");
	}

	return ret;
}

/*
 * Do an accept(2) on the sock and return the new lttcomm socket. The socket
 * MUST be bind(2) before.
 */
LTTNG_HIDDEN
struct lttcomm_sock *lttcomm_accept_inet6_sock(struct lttcomm_sock *sock)
{
	int new_fd;
	socklen_t len;
	struct lttcomm_sock *new_sock;

	if (sock->proto == LTTCOMM_SOCK_UDP) {
		/*
		 * accept(2) does not exist for UDP so simply return the passed socket.
		 */
		new_sock = sock;
		goto end;
	}

	new_sock = lttcomm_alloc_sock(sock->proto);
	if (new_sock == NULL) {
		goto error;
	}

	len = sizeof(new_sock->sockaddr.addr.sin6);

	/* Blocking call */
	new_fd = accept(sock->fd,
			(struct sockaddr *) &new_sock->sockaddr.addr.sin6, &len);
	if (new_fd < 0) {
		PERROR("accept inet6");
		goto error;
	}

	new_sock->fd = new_fd;
	new_sock->ops = &inet6_ops;

end:
	return new_sock;

error:
	free(new_sock);
	return NULL;
}

/*
 * Make the socket listen using LTTNG_SESSIOND_COMM_MAX_LISTEN.
 */
LTTNG_HIDDEN
int lttcomm_listen_inet6_sock(struct lttcomm_sock *sock, int backlog)
{
	int ret;

	if (sock->proto == LTTCOMM_SOCK_UDP) {
		/* listen(2) does not exist for UDP so simply return success. */
		ret = 0;
		goto end;
	}

	/* Default listen backlog */
	if (backlog <= 0) {
		backlog = LTTNG_SESSIOND_COMM_MAX_LISTEN;
	}

	ret = listen(sock->fd, backlog);
	if (ret < 0) {
		PERROR("listen inet6");
	}

end:
	return ret;
}

/*
 * Receive data of size len in put that data into the buf param. Using recvmsg
 * API.
 *
 * Return the size of received data.
 */
LTTNG_HIDDEN
ssize_t lttcomm_recvmsg_inet6_sock(struct lttcomm_sock *sock, void *buf,
		size_t len, int flags)
{
	struct msghdr msg;
	struct iovec iov[1];
	ssize_t ret = -1;
	size_t len_last;

	memset(&msg, 0, sizeof(msg));

	iov[0].iov_base = buf;
	iov[0].iov_len = len;
	msg.msg_iov = iov;
	msg.msg_iovlen = 1;

	msg.msg_name = (struct sockaddr *) &sock->sockaddr.addr.sin6;
	msg.msg_namelen = sizeof(sock->sockaddr.addr.sin6);

	do {
		len_last = iov[0].iov_len;
		ret = recvmsg(sock->fd, &msg, flags);
		if (ret > 0) {
			iov[0].iov_base += ret;
			iov[0].iov_len -= ret;
			assert(ret <= len_last);
		}
	} while ((ret > 0 && ret < len_last) || (ret < 0 && errno == EINTR));
	if (ret < 0) {
		PERROR("recvmsg inet");
	} else if (ret > 0) {
		ret = len;
	}
	/* Else ret = 0 meaning an orderly shutdown. */

	return ret;
}

/*
 * Send buf data of size len. Using sendmsg API.
 *
 * Return the size of sent data.
 */
LTTNG_HIDDEN
ssize_t lttcomm_sendmsg_inet6_sock(struct lttcomm_sock *sock, const void *buf,
		size_t len, int flags)
{
	struct msghdr msg;
	struct iovec iov[1];
	ssize_t ret = -1;

	memset(&msg, 0, sizeof(msg));

	iov[0].iov_base = (void *) buf;
	iov[0].iov_len = len;
	msg.msg_iov = iov;
	msg.msg_iovlen = 1;

	switch (sock->proto) {
	case LTTCOMM_SOCK_UDP:
		msg.msg_name = (struct sockaddr *) &sock->sockaddr.addr.sin6;
		msg.msg_namelen = sizeof(sock->sockaddr.addr.sin6);
		break;
	default:
		break;
	}

	do {
		ret = sendmsg(sock->fd, &msg, flags);
	} while (ret < 0 && errno == EINTR);
	if (ret < 0) {
		/*
		 * Only warn about EPIPE when quiet mode is deactivated.
		 * We consider EPIPE as expected.
		 */
		if (errno != EPIPE || !lttng_opt_quiet) {
			PERROR("sendmsg inet6");
		}
	}

	return ret;
}

/*
 * Shutdown cleanly and close.
 */
LTTNG_HIDDEN
int lttcomm_close_inet6_sock(struct lttcomm_sock *sock)
{
	int ret;

	/* Don't try to close an invalid marked socket */
	if (sock->fd == -1) {
		return 0;
	}

	ret = close(sock->fd);
	if (ret) {
		PERROR("close inet6");
	}

	/* Mark socket */
	sock->fd = -1;

	return ret;
}
Commit	Line	Data
6364a07a DG	1	/*
	2	* Copyright (C) 2012 - David Goulet <dgoulet@efficios.com>
	3	*
	4	* This program is free software; you can redistribute it and/or modify it
	5	* under the terms of the GNU General Public License, version 2 only, as
	6	* published by the Free Software Foundation.
	7	*
	8	* This program is distributed in the hope that it will be useful, but WITHOUT
	9	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	10	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	11	* more details.
	12	*
	13	* You should have received a copy of the GNU General Public License along with
	14	* this program; if not, write to the Free Software Foundation, Inc., 51
	15	* Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
	16	*/
	17
6c1c0768	18	#define _LGPL_SOURCE
6364a07a DG	19	#include <assert.h>
	20	#include <limits.h>
	21	#include <stdio.h>
	22	#include <stdlib.h>
	23	#include <string.h>
	24	#include <sys/stat.h>
	25	#include <sys/types.h>
	26	#include <unistd.h>
	27	#include <errno.h>
a655f4cf	28	#include <fcntl.h>
389fbf04	29	#include <common/compat/time.h>
a655f4cf	30	#include <poll.h>
6364a07a	31
90e535ef	32	#include <common/common.h>
395d6b02	33	#include <common/time.h>
6364a07a DG	34
	35	#include "inet6.h"
	36
a655f4cf MD	37	#define RECONNECT_DELAY 200 /* ms */
a655f4cf MD	38
6364a07a DG	39	/*
	40	* INET protocol operations.
	41	*/
	42	static const struct lttcomm_proto_ops inet6_ops = {
	43	.bind = lttcomm_bind_inet6_sock,
	44	.close = lttcomm_close_inet6_sock,
	45	.connect = lttcomm_connect_inet6_sock,
	46	.accept = lttcomm_accept_inet6_sock,
	47	.listen = lttcomm_listen_inet6_sock,
	48	.recvmsg = lttcomm_recvmsg_inet6_sock,
	49	.sendmsg = lttcomm_sendmsg_inet6_sock,
	50	};
	51
	52	/*
	53	* Creates an PF_INET socket.
	54	*/
90e535ef	55	LTTNG_HIDDEN
6364a07a DG	56	int lttcomm_create_inet6_sock(struct lttcomm_sock *sock, int type, int proto)
6364a07a DG	57	{
de5e9086	58	int val = 1, ret;
783a3b9a	59	unsigned long timeout;
6364a07a DG	60
6364a07a DG	61	/* Create server socket */
7b43086d	62	if ((sock->fd = socket(PF_INET6, type, proto)) < 0) {
6364a07a DG	63	PERROR("socket inet6");
	64	goto error;
	65	}
	66
	67	sock->ops = &inet6_ops;
	68
	69	/*
	70	* Set socket option to reuse the address.
	71	*/
	72	ret = setsockopt(sock->fd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(int));
	73	if (ret < 0) {
	74	PERROR("setsockopt inet6");
	75	goto error;
	76	}
783a3b9a MD	77	timeout = lttcomm_get_network_timeout();
	78	if (timeout) {
	79	ret = lttcomm_setsockopt_rcv_timeout(sock->fd, timeout);
	80	if (ret) {
	81	goto error;
	82	}
	83	ret = lttcomm_setsockopt_snd_timeout(sock->fd, timeout);
	84	if (ret) {
	85	goto error;
	86	}
	87	}
6364a07a DG	88
	89	return 0;
	90
	91	error:
	92	return -1;
	93	}
	94
	95	/*
	96	* Bind socket and return.
	97	*/
90e535ef	98	LTTNG_HIDDEN
6364a07a DG	99	int lttcomm_bind_inet6_sock(struct lttcomm_sock *sock)
	100	{
	101	int ret;
	102
14b88ccf	103	ret = bind(sock->fd, (const struct sockaddr *) &sock->sockaddr.addr.sin6,
6364a07a DG	104	sizeof(sock->sockaddr.addr.sin6));
	105	if (ret < 0) {
	106	PERROR("bind inet6");
	107	}
	108
	109	return ret;
	110	}
	111
a655f4cf MD	112	static
	113	int connect_no_timeout(struct lttcomm_sock *sock)
	114	{
	115	return connect(sock->fd, (struct sockaddr *) &sock->sockaddr.addr.sin6,
	116	sizeof(sock->sockaddr.addr.sin6));
	117	}
	118
	119	/*
	120	* Return time_a - time_b in milliseconds.
	121	*/
	122	static
	123	unsigned long time_diff_ms(struct timespec *time_a,
	124	struct timespec *time_b)
	125	{
	126	time_t sec_diff;
	127	long nsec_diff;
	128	unsigned long result_ms;
	129
	130	sec_diff = time_a->tv_sec - time_b->tv_sec;
	131	nsec_diff = time_a->tv_nsec - time_b->tv_nsec;
	132
	133	result_ms = sec_diff * MSEC_PER_SEC;
	134	result_ms += nsec_diff / NSEC_PER_MSEC;
	135	return result_ms;
	136	}
	137
	138	static
	139	int connect_with_timeout(struct lttcomm_sock *sock)
	140	{
	141	unsigned long timeout = lttcomm_get_network_timeout();
	142	int ret, flags, connect_ret;
	143	struct timespec orig_time, cur_time;
	144
	145	ret = fcntl(sock->fd, F_GETFL, 0);
	146	if (ret == -1) {
	147	PERROR("fcntl");
	148	return -1;
	149	}
	150	flags = ret;
	151
	152	/* Set socket to nonblock */
	153	ret = fcntl(sock->fd, F_SETFL, flags \| O_NONBLOCK);
	154	if (ret == -1) {
	155	PERROR("fcntl");
	156	return -1;
	157	}
	158
389fbf04	159	ret = lttng_clock_gettime(CLOCK_MONOTONIC, &orig_time);
a655f4cf MD	160	if (ret == -1) {
	161	PERROR("clock_gettime");
	162	return -1;
	163	}
	164
	165	connect_ret = connect(sock->fd,
	166	(struct sockaddr *) &sock->sockaddr.addr.sin6,
	167	sizeof(sock->sockaddr.addr.sin6));
	168	if (connect_ret == -1 && errno != EAGAIN
	169	&& errno != EWOULDBLOCK
	170	&& errno != EINPROGRESS) {
	171	goto error;
	172	} else if (!connect_ret) {
	173	/* Connect succeeded */
	174	goto success;
	175	}
	176
48ac9596 JR	177	DBG("Asynchronous connect for sock %d, performing polling with"
	178	" timeout: %lums", sock->fd, timeout);
	179
a655f4cf MD	180	/*
	181	* Perform poll loop following EINPROGRESS recommendation from
	182	* connect(2) man page.
	183	*/
	184	do {
	185	struct pollfd fds;
	186
	187	fds.fd = sock->fd;
	188	fds.events = POLLOUT;
	189	fds.revents = 0;
	190	ret = poll(&fds, 1, RECONNECT_DELAY);
	191	if (ret < 0) {
	192	goto error;
	193	} else if (ret > 0) {
	194	int optval;
	195	socklen_t optval_len = sizeof(optval);
	196
	197	if (!(fds.revents & POLLOUT)) {
	198	/* Either hup or error */
	199	errno = EPIPE;
	200	goto error;
	201	}
	202	/* got something */
	203	ret = getsockopt(sock->fd, SOL_SOCKET,
	204	SO_ERROR, &optval, &optval_len);
	205	if (ret) {
48ac9596	206	PERROR("getsockopt");
a655f4cf MD	207	goto error;
	208	}
	209	if (!optval) {
	210	connect_ret = 0;
	211	goto success;
	212	} else {
48ac9596 JR	213	/* Get actual connect() errno from opt_val */
48ac9596 JR	214	errno = optval;
a655f4cf MD	215	goto error;
	216	}
	217	}
	218	/* ret == 0: timeout */
389fbf04	219	ret = lttng_clock_gettime(CLOCK_MONOTONIC, &cur_time);
a655f4cf MD	220	if (ret == -1) {
	221	PERROR("clock_gettime");
	222	connect_ret = ret;
	223	goto error;
	224	}
	225	} while (time_diff_ms(&cur_time, &orig_time) < timeout);
	226
	227	/* Timeout */
	228	errno = ETIMEDOUT;
	229	connect_ret = -1;
	230
	231	success:
	232	/* Restore initial flags */
	233	ret = fcntl(sock->fd, F_SETFL, flags);
	234	if (ret == -1) {
	235	PERROR("fcntl");
	236	/* Continue anyway */
	237	}
	238	error:
	239	return connect_ret;
	240	}
	241
6364a07a DG	242	/*
	243	* Connect PF_INET socket.
	244	*/
90e535ef	245	LTTNG_HIDDEN
6364a07a DG	246	int lttcomm_connect_inet6_sock(struct lttcomm_sock *sock)
	247	{
	248	int ret, closeret;
	249
a655f4cf MD	250	if (lttcomm_get_network_timeout()) {
	251	ret = connect_with_timeout(sock);
	252	} else {
	253	ret = connect_no_timeout(sock);
	254	}
6364a07a	255	if (ret < 0) {
82c05d47	256	PERROR("connect inet6");
6364a07a DG	257	goto error_connect;
	258	}
	259
	260	return ret;
	261
	262	error_connect:
	263	closeret = close(sock->fd);
	264	if (closeret) {
	265	PERROR("close inet6");
	266	}
	267
	268	return ret;
	269	}
	270
	271	/*
	272	* Do an accept(2) on the sock and return the new lttcomm socket. The socket
	273	* MUST be bind(2) before.
	274	*/
90e535ef	275	LTTNG_HIDDEN
6364a07a DG	276	struct lttcomm_sock lttcomm_accept_inet6_sock(struct lttcomm_sock sock)
	277	{
	278	int new_fd;
88a5db70	279	socklen_t len;
6364a07a DG	280	struct lttcomm_sock *new_sock;
	281
	282	if (sock->proto == LTTCOMM_SOCK_UDP) {
	283	/*
	284	* accept(2) does not exist for UDP so simply return the passed socket.
	285	*/
	286	new_sock = sock;
	287	goto end;
	288	}
	289
de5e9086	290	new_sock = lttcomm_alloc_sock(sock->proto);
6364a07a DG	291	if (new_sock == NULL) {
	292	goto error;
	293	}
	294
88a5db70 DG	295	len = sizeof(new_sock->sockaddr.addr.sin6);
88a5db70 DG	296
6364a07a DG	297	/* Blocking call */
	298	new_fd = accept(sock->fd,
	299	(struct sockaddr *) &new_sock->sockaddr.addr.sin6, &len);
	300	if (new_fd < 0) {
	301	PERROR("accept inet6");
	302	goto error;
	303	}
	304
	305	new_sock->fd = new_fd;
de5e9086	306	new_sock->ops = &inet6_ops;
6364a07a DG	307
	308	end:
	309	return new_sock;
	310
	311	error:
	312	free(new_sock);
	313	return NULL;
	314	}
	315
	316	/*
	317	* Make the socket listen using LTTNG_SESSIOND_COMM_MAX_LISTEN.
	318	*/
90e535ef	319	LTTNG_HIDDEN
6364a07a DG	320	int lttcomm_listen_inet6_sock(struct lttcomm_sock *sock, int backlog)
	321	{
	322	int ret;
	323
	324	if (sock->proto == LTTCOMM_SOCK_UDP) {
	325	/* listen(2) does not exist for UDP so simply return success. */
	326	ret = 0;
	327	goto end;
	328	}
	329
	330	/* Default listen backlog */
	331	if (backlog <= 0) {
	332	backlog = LTTNG_SESSIOND_COMM_MAX_LISTEN;
	333	}
	334
	335	ret = listen(sock->fd, backlog);
	336	if (ret < 0) {
	337	PERROR("listen inet6");
	338	}
	339
	340	end:
	341	return ret;
	342	}
	343
	344	/*
	345	* Receive data of size len in put that data into the buf param. Using recvmsg
	346	* API.
	347	*
	348	* Return the size of received data.
	349	*/
90e535ef	350	LTTNG_HIDDEN
6364a07a DG	351	ssize_t lttcomm_recvmsg_inet6_sock(struct lttcomm_sock sock, void buf,
	352	size_t len, int flags)
	353	{
	354	struct msghdr msg;
	355	struct iovec iov[1];
	356	ssize_t ret = -1;
7c5aef62	357	size_t len_last;
6364a07a DG	358
	359	memset(&msg, 0, sizeof(msg));
	360
	361	iov[0].iov_base = buf;
	362	iov[0].iov_len = len;
	363	msg.msg_iov = iov;
	364	msg.msg_iovlen = 1;
	365
	366	msg.msg_name = (struct sockaddr *) &sock->sockaddr.addr.sin6;
	367	msg.msg_namelen = sizeof(sock->sockaddr.addr.sin6);
	368
6364a07a	369	do {
7c5aef62	370	len_last = iov[0].iov_len;
6364a07a	371	ret = recvmsg(sock->fd, &msg, flags);
7c5aef62 DG	372	if (ret > 0) {
	373	iov[0].iov_base += ret;
	374	iov[0].iov_len -= ret;
	375	assert(ret <= len_last);
	376	}
	377	} while ((ret > 0 && ret < len_last) \|\| (ret < 0 && errno == EINTR));
6364a07a	378	if (ret < 0) {
7c5aef62 DG	379	PERROR("recvmsg inet");
	380	} else if (ret > 0) {
	381	ret = len;
6364a07a	382	}
7c5aef62	383	/* Else ret = 0 meaning an orderly shutdown. */
6364a07a DG	384
	385	return ret;
	386	}
	387
	388	/*
	389	* Send buf data of size len. Using sendmsg API.
	390	*
	391	* Return the size of sent data.
	392	*/
90e535ef	393	LTTNG_HIDDEN
c2d69327	394	ssize_t lttcomm_sendmsg_inet6_sock(struct lttcomm_sock sock, const void buf,
6364a07a DG	395	size_t len, int flags)
	396	{
	397	struct msghdr msg;
	398	struct iovec iov[1];
	399	ssize_t ret = -1;
	400
	401	memset(&msg, 0, sizeof(msg));
	402
c2d69327	403	iov[0].iov_base = (void *) buf;
6364a07a DG	404	iov[0].iov_len = len;
	405	msg.msg_iov = iov;
	406	msg.msg_iovlen = 1;
	407
	408	switch (sock->proto) {
	409	case LTTCOMM_SOCK_UDP:
	410	msg.msg_name = (struct sockaddr *) &sock->sockaddr.addr.sin6;
	411	msg.msg_namelen = sizeof(sock->sockaddr.addr.sin6);
	412	break;
	413	default:
	414	break;
	415	}
	416
	417	do {
	418	ret = sendmsg(sock->fd, &msg, flags);
	419	} while (ret < 0 && errno == EINTR);
	420	if (ret < 0) {
	421	/*
	422	* Only warn about EPIPE when quiet mode is deactivated.
	423	* We consider EPIPE as expected.
	424	*/
	425	if (errno != EPIPE \|\| !lttng_opt_quiet) {
	426	PERROR("sendmsg inet6");
	427	}
	428	}
	429
	430	return ret;
	431	}
	432
	433	/*
	434	* Shutdown cleanly and close.
	435	*/
90e535ef	436	LTTNG_HIDDEN
6364a07a DG	437	int lttcomm_close_inet6_sock(struct lttcomm_sock *sock)
6364a07a DG	438	{
6e742359	439	int ret;
6364a07a	440
de5e9086	441	/* Don't try to close an invalid marked socket */
6364a07a DG	442	if (sock->fd == -1) {
	443	return 0;
	444	}
	445
6e742359 DG	446	ret = close(sock->fd);
6e742359 DG	447	if (ret) {
6364a07a DG	448	PERROR("close inet6");
	449	}
	450
	451	/* Mark socket */
	452	sock->fd = -1;
	453
	454	return ret;
	455	}