[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));
}

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;
	unsigned long diff_ms;

	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;
		}
		if (timespec_to_ms(timespec_abs_diff(cur_time, orig_time), &diff_ms) < 0) {
			ERR("timespec_to_ms input overflows milliseconds output");
			connect_ret = -1;
			goto error;
		}
	} while (diff_ms < 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) {
			if (flags & MSG_DONTWAIT) {
				goto end;
			}
			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. */
end:
	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
a655f4cf MD	119	static
	120	int connect_with_timeout(struct lttcomm_sock *sock)
	121	{
	122	unsigned long timeout = lttcomm_get_network_timeout();
	123	int ret, flags, connect_ret;
	124	struct timespec orig_time, cur_time;
9cc0ed0d	125	unsigned long diff_ms;
a655f4cf MD	126
	127	ret = fcntl(sock->fd, F_GETFL, 0);
	128	if (ret == -1) {
	129	PERROR("fcntl");
	130	return -1;
	131	}
	132	flags = ret;
	133
	134	/* Set socket to nonblock */
	135	ret = fcntl(sock->fd, F_SETFL, flags \| O_NONBLOCK);
	136	if (ret == -1) {
	137	PERROR("fcntl");
	138	return -1;
	139	}
	140
389fbf04	141	ret = lttng_clock_gettime(CLOCK_MONOTONIC, &orig_time);
a655f4cf MD	142	if (ret == -1) {
	143	PERROR("clock_gettime");
	144	return -1;
	145	}
	146
	147	connect_ret = connect(sock->fd,
	148	(struct sockaddr *) &sock->sockaddr.addr.sin6,
	149	sizeof(sock->sockaddr.addr.sin6));
	150	if (connect_ret == -1 && errno != EAGAIN
	151	&& errno != EWOULDBLOCK
	152	&& errno != EINPROGRESS) {
	153	goto error;
	154	} else if (!connect_ret) {
	155	/* Connect succeeded */
	156	goto success;
	157	}
	158
40bb1b2a JR	159	DBG("Asynchronous connect for sock %d, performing polling with"
	160	" timeout: %lums", sock->fd, timeout);
	161
a655f4cf MD	162	/*
	163	* Perform poll loop following EINPROGRESS recommendation from
	164	* connect(2) man page.
	165	*/
	166	do {
	167	struct pollfd fds;
	168
	169	fds.fd = sock->fd;
	170	fds.events = POLLOUT;
	171	fds.revents = 0;
	172	ret = poll(&fds, 1, RECONNECT_DELAY);
	173	if (ret < 0) {
	174	goto error;
	175	} else if (ret > 0) {
	176	int optval;
	177	socklen_t optval_len = sizeof(optval);
	178
	179	if (!(fds.revents & POLLOUT)) {
	180	/* Either hup or error */
	181	errno = EPIPE;
	182	goto error;
	183	}
	184	/* got something */
	185	ret = getsockopt(sock->fd, SOL_SOCKET,
	186	SO_ERROR, &optval, &optval_len);
	187	if (ret) {
40bb1b2a	188	PERROR("getsockopt");
a655f4cf MD	189	goto error;
	190	}
	191	if (!optval) {
	192	connect_ret = 0;
	193	goto success;
	194	} else {
40bb1b2a JR	195	/* Get actual connect() errno from opt_val */
40bb1b2a JR	196	errno = optval;
a655f4cf MD	197	goto error;
	198	}
	199	}
	200	/* ret == 0: timeout */
389fbf04	201	ret = lttng_clock_gettime(CLOCK_MONOTONIC, &cur_time);
a655f4cf MD	202	if (ret == -1) {
	203	PERROR("clock_gettime");
	204	connect_ret = ret;
	205	goto error;
	206	}
9cc0ed0d MD	207	if (timespec_to_ms(timespec_abs_diff(cur_time, orig_time), &diff_ms) < 0) {
	208	ERR("timespec_to_ms input overflows milliseconds output");
	209	connect_ret = -1;
	210	goto error;
	211	}
	212	} while (diff_ms < timeout);
a655f4cf MD	213
	214	/* Timeout */
	215	errno = ETIMEDOUT;
	216	connect_ret = -1;
	217
	218	success:
	219	/* Restore initial flags */
	220	ret = fcntl(sock->fd, F_SETFL, flags);
	221	if (ret == -1) {
	222	PERROR("fcntl");
	223	/* Continue anyway */
	224	}
	225	error:
	226	return connect_ret;
	227	}
	228
6364a07a DG	229	/*
	230	* Connect PF_INET socket.
	231	*/
90e535ef	232	LTTNG_HIDDEN
6364a07a DG	233	int lttcomm_connect_inet6_sock(struct lttcomm_sock *sock)
	234	{
	235	int ret, closeret;
	236
a655f4cf MD	237	if (lttcomm_get_network_timeout()) {
	238	ret = connect_with_timeout(sock);
	239	} else {
	240	ret = connect_no_timeout(sock);
	241	}
6364a07a	242	if (ret < 0) {
82c05d47	243	PERROR("connect inet6");
6364a07a DG	244	goto error_connect;
	245	}
	246
	247	return ret;
	248
	249	error_connect:
	250	closeret = close(sock->fd);
	251	if (closeret) {
	252	PERROR("close inet6");
	253	}
	254
	255	return ret;
	256	}
	257
	258	/*
	259	* Do an accept(2) on the sock and return the new lttcomm socket. The socket
	260	* MUST be bind(2) before.
	261	*/
90e535ef	262	LTTNG_HIDDEN
6364a07a DG	263	struct lttcomm_sock lttcomm_accept_inet6_sock(struct lttcomm_sock sock)
	264	{
	265	int new_fd;
88a5db70	266	socklen_t len;
6364a07a DG	267	struct lttcomm_sock *new_sock;
	268
	269	if (sock->proto == LTTCOMM_SOCK_UDP) {
	270	/*
	271	* accept(2) does not exist for UDP so simply return the passed socket.
	272	*/
	273	new_sock = sock;
	274	goto end;
	275	}
	276
de5e9086	277	new_sock = lttcomm_alloc_sock(sock->proto);
6364a07a DG	278	if (new_sock == NULL) {
	279	goto error;
	280	}
	281
88a5db70 DG	282	len = sizeof(new_sock->sockaddr.addr.sin6);
88a5db70 DG	283
6364a07a DG	284	/* Blocking call */
	285	new_fd = accept(sock->fd,
	286	(struct sockaddr *) &new_sock->sockaddr.addr.sin6, &len);
	287	if (new_fd < 0) {
	288	PERROR("accept inet6");
	289	goto error;
	290	}
	291
	292	new_sock->fd = new_fd;
de5e9086	293	new_sock->ops = &inet6_ops;
6364a07a DG	294
	295	end:
	296	return new_sock;
	297
	298	error:
	299	free(new_sock);
	300	return NULL;
	301	}
	302
	303	/*
	304	* Make the socket listen using LTTNG_SESSIOND_COMM_MAX_LISTEN.
	305	*/
90e535ef	306	LTTNG_HIDDEN
6364a07a DG	307	int lttcomm_listen_inet6_sock(struct lttcomm_sock *sock, int backlog)
	308	{
	309	int ret;
	310
	311	if (sock->proto == LTTCOMM_SOCK_UDP) {
	312	/* listen(2) does not exist for UDP so simply return success. */
	313	ret = 0;
	314	goto end;
	315	}
	316
	317	/* Default listen backlog */
	318	if (backlog <= 0) {
	319	backlog = LTTNG_SESSIOND_COMM_MAX_LISTEN;
	320	}
	321
	322	ret = listen(sock->fd, backlog);
	323	if (ret < 0) {
	324	PERROR("listen inet6");
	325	}
	326
	327	end:
	328	return ret;
	329	}
	330
	331	/*
	332	* Receive data of size len in put that data into the buf param. Using recvmsg
	333	* API.
	334	*
	335	* Return the size of received data.
	336	*/
90e535ef	337	LTTNG_HIDDEN
6364a07a DG	338	ssize_t lttcomm_recvmsg_inet6_sock(struct lttcomm_sock sock, void buf,
	339	size_t len, int flags)
	340	{
	341	struct msghdr msg;
	342	struct iovec iov[1];
	343	ssize_t ret = -1;
7c5aef62	344	size_t len_last;
6364a07a DG	345
	346	memset(&msg, 0, sizeof(msg));
	347
	348	iov[0].iov_base = buf;
	349	iov[0].iov_len = len;
	350	msg.msg_iov = iov;
	351	msg.msg_iovlen = 1;
	352
	353	msg.msg_name = (struct sockaddr *) &sock->sockaddr.addr.sin6;
	354	msg.msg_namelen = sizeof(sock->sockaddr.addr.sin6);
	355
6364a07a	356	do {
7c5aef62	357	len_last = iov[0].iov_len;
6364a07a	358	ret = recvmsg(sock->fd, &msg, flags);
7c5aef62	359	if (ret > 0) {
44a2fbf1 JG	360	if (flags & MSG_DONTWAIT) {
	361	goto end;
	362	}
7c5aef62 DG	363	iov[0].iov_base += ret;
	364	iov[0].iov_len -= ret;
	365	assert(ret <= len_last);
	366	}
	367	} while ((ret > 0 && ret < len_last) \|\| (ret < 0 && errno == EINTR));
6364a07a	368	if (ret < 0) {
7c5aef62 DG	369	PERROR("recvmsg inet");
	370	} else if (ret > 0) {
	371	ret = len;
6364a07a	372	}
7c5aef62	373	/* Else ret = 0 meaning an orderly shutdown. */
44a2fbf1	374	end:
6364a07a DG	375	return ret;
	376	}
	377
	378	/*
	379	* Send buf data of size len. Using sendmsg API.
	380	*
	381	* Return the size of sent data.
	382	*/
90e535ef	383	LTTNG_HIDDEN
c2d69327	384	ssize_t lttcomm_sendmsg_inet6_sock(struct lttcomm_sock sock, const void buf,
6364a07a DG	385	size_t len, int flags)
	386	{
	387	struct msghdr msg;
	388	struct iovec iov[1];
	389	ssize_t ret = -1;
	390
	391	memset(&msg, 0, sizeof(msg));
	392
c2d69327	393	iov[0].iov_base = (void *) buf;
6364a07a DG	394	iov[0].iov_len = len;
	395	msg.msg_iov = iov;
	396	msg.msg_iovlen = 1;
	397
	398	switch (sock->proto) {
	399	case LTTCOMM_SOCK_UDP:
	400	msg.msg_name = (struct sockaddr *) &sock->sockaddr.addr.sin6;
	401	msg.msg_namelen = sizeof(sock->sockaddr.addr.sin6);
	402	break;
	403	default:
	404	break;
	405	}
	406
	407	do {
	408	ret = sendmsg(sock->fd, &msg, flags);
	409	} while (ret < 0 && errno == EINTR);
	410	if (ret < 0) {
	411	/*
	412	* Only warn about EPIPE when quiet mode is deactivated.
	413	* We consider EPIPE as expected.
	414	*/
	415	if (errno != EPIPE \|\| !lttng_opt_quiet) {
	416	PERROR("sendmsg inet6");
	417	}
	418	}
	419
	420	return ret;
	421	}
	422
	423	/*
	424	* Shutdown cleanly and close.
	425	*/
90e535ef	426	LTTNG_HIDDEN
6364a07a DG	427	int lttcomm_close_inet6_sock(struct lttcomm_sock *sock)
6364a07a DG	428	{
6e742359	429	int ret;
6364a07a	430
de5e9086	431	/* Don't try to close an invalid marked socket */
6364a07a DG	432	if (sock->fd == -1) {
	433	return 0;
	434	}
	435
6e742359 DG	436	ret = close(sock->fd);
6e742359 DG	437	if (ret) {
6364a07a DG	438	PERROR("close inet6");
	439	}
	440
	441	/* Mark socket */
	442	sock->fd = -1;
	443
	444	return ret;
	445	}