[lttng-tools.git] / liblttsessiondcomm / liblttsessiondcomm.c

/*
 * Copyright (C)  2011 - David Goulet <david.goulet@polymtl.ca>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * 
 * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

#define _GNU_SOURCE
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/un.h>
#include <unistd.h>

#include "liblttsessiondcomm.h"

/*
 * Human readable error message.
 */
static const char *lttcomm_readable_code[] = {
	[ LTTCOMM_ERR_INDEX(LTTCOMM_OK) ] = "Success",
	[ LTTCOMM_ERR_INDEX(LTTCOMM_ERR) ] = "Unknown error",
	[ LTTCOMM_ERR_INDEX(LTTCOMM_UND) ] = "Undefined command",
	[ LTTCOMM_ERR_INDEX(LTTCOMM_NO_SESSION) ] = "No session found",
	[ LTTCOMM_ERR_INDEX(LTTCOMM_LIST_FAIL) ] = "Unable to list traceable apps",
	[ LTTCOMM_ERR_INDEX(LTTCOMM_NO_APPS) ] = "No traceable apps found",
	[ LTTCOMM_ERR_INDEX(LTTCOMM_NO_SESS) ] = "No session found",
	[ LTTCOMM_ERR_INDEX(LTTCOMM_NO_TRACE) ] = "No trace found",
	[ LTTCOMM_ERR_INDEX(LTTCOMM_FATAL) ] = "Fatal error of the session daemon",
	[ LTTCOMM_ERR_INDEX(LTTCOMM_CREATE_FAIL) ] = "Create trace failed",
	[ LTTCOMM_ERR_INDEX(LTTCOMM_START_FAIL) ] = "Start trace failed",
	[ LTTCOMM_ERR_INDEX(LTTCOMM_STOP_FAIL) ] = "Stop trace failed",
	[ LTTCOMM_ERR_INDEX(LTTCOMM_NO_TRACEABLE) ] = "App is not traceable",
	[ LTTCOMM_ERR_INDEX(LTTCOMM_SELECT_SESS) ] = "A session MUST be selected",
	[ LTTCOMM_ERR_INDEX(LTTCOMM_EXIST_SESS) ] = "Session name already exist",
	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_NA) ] = "Kernel tracer not available",
	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_SESS_FAIL) ] = "Kernel create session failed",
	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_FAIL) ] = "Kernel create channel failed",
	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_ENABLE_FAIL) ] = "Enable kernel event failed",
	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_DISABLE_FAIL) ] = "Disable kernel event failed",
	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_META_FAIL) ] = "Opening metadata failed",
	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_START_FAIL) ] = "Starting kernel trace failed",
	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_STOP_FAIL) ] = "Stoping kernel trace failed",
	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CONSUMER_FAIL) ] = "Kernel consumer start failed",
	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_STREAM_FAIL) ] = "Kernel create stream failed",
	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_DIR_FAIL) ] = "Kernel trace directory creation failed",
	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_DIR_EXIST) ] = "Kernel trace directory already exist",
	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_NO_SESSION) ] = "No kernel session found",
	[ LTTCOMM_ERR_INDEX(KCONSUMERD_COMMAND_SOCK_READY) ] = "Kconsumerd command socket ready",
	[ LTTCOMM_ERR_INDEX(KCONSUMERD_SUCCESS_RECV_FD) ] = "Kconsumerd success on receiving fds",
	[ LTTCOMM_ERR_INDEX(KCONSUMERD_ERROR_RECV_FD) ] = "Kconsumerd error on receiving fds",
	[ LTTCOMM_ERR_INDEX(KCONSUMERD_POLL_ERROR) ] = "Kconsumerd error in polling thread",
	[ LTTCOMM_ERR_INDEX(KCONSUMERD_POLL_NVAL) ] = "Kconsumerd polling on closed fd",
	[ LTTCOMM_ERR_INDEX(KCONSUMERD_POLL_HUP) ] = "Kconsumerd all fd hung up",
	[ LTTCOMM_ERR_INDEX(KCONSUMERD_EXIT_SUCCESS) ] = "Kconsumerd exiting normally",
	[ LTTCOMM_ERR_INDEX(KCONSUMERD_EXIT_FAILURE) ] = "Kconsumerd exiting on error",
	[ LTTCOMM_ERR_INDEX(KCONSUMERD_OUTFD_ERROR) ] = "Kconsumerd error opening the tracefile",
	[ LTTCOMM_ERR_INDEX(KCONSUMERD_SPLICE_EBADF) ] = "Kconsumerd splice EBADF",
	[ LTTCOMM_ERR_INDEX(KCONSUMERD_SPLICE_EINVAL) ] = "Kconsumerd splice EINVAL",
	[ LTTCOMM_ERR_INDEX(KCONSUMERD_SPLICE_ENOMEM) ] = "Kconsumerd splice ENOMEM",
	[ LTTCOMM_ERR_INDEX(KCONSUMERD_SPLICE_ESPIPE) ] = "Kconsumerd splice ESPIPE",
	[ LTTCOMM_ERR_INDEX(LTTCOMM_NO_EVENT) ] = "No event found",
};

/*
 *  lttcom_get_readable_code
 *
 *  Return ptr to string representing a human readable
 *  error code from the lttcomm_return_code enum.
 *
 *  These code MUST be negative in other to treat that
 *  as an error value.
 */
const char *lttcomm_get_readable_code(enum lttcomm_return_code code)
{
	int tmp_code = -code;

	if (tmp_code >= LTTCOMM_OK && tmp_code < LTTCOMM_NR) {
		return lttcomm_readable_code[LTTCOMM_ERR_INDEX(tmp_code)];
	}

	return "Unknown error code";
}

/*
 * 	lttcomm_connect_unix_sock
 *
 * 	Connect to unix socket using the path name.
 */
int lttcomm_connect_unix_sock(const char *pathname)
{
	struct sockaddr_un sun;
	int fd;
	int ret = 1;

	fd = socket(PF_UNIX, SOCK_STREAM, 0);
	if (fd < 0) {
		perror("socket");
		goto error;
	}

	memset(&sun, 0, sizeof(sun));
	sun.sun_family = AF_UNIX;
	strncpy(sun.sun_path, pathname, sizeof(sun.sun_path));

	ret = connect(fd, (struct sockaddr *) &sun, sizeof(sun));
	if (ret < 0) {
		perror("connect");
		goto error;
	}

	return fd;

error:
	return -1;
}

/*
 * 	lttcomm_accept_unix_sock
 *
 *	Do an accept(2) on the sock and return the
 *	new file descriptor. The socket MUST be bind(2) before.
 */
int lttcomm_accept_unix_sock(int sock)
{
	int new_fd;
	struct sockaddr_un sun;
	socklen_t len = 0;

	/* Blocking call */
	new_fd = accept(sock, (struct sockaddr *) &sun, &len);
	if (new_fd < 0) {
		perror("accept");
		goto error;
	}

	return new_fd;

error:
	return -1;
}

/*
 * 	lttcomm_create_unix_sock
 *
 * 	Creates a AF_UNIX local socket using pathname
 * 	bind the socket upon creation and return the fd.
 */
int lttcomm_create_unix_sock(const char *pathname)
{
	struct sockaddr_un sun;
	int fd;
	int ret = -1;

	/* Create server socket */
	if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) {
		perror("socket");
		goto error;
	}

	memset(&sun, 0, sizeof(sun));
	sun.sun_family = AF_UNIX;
	strncpy(sun.sun_path, pathname, strlen(pathname));

	ret = bind(fd, (struct sockaddr *) &sun, sizeof(sun));
	if (ret < 0) {
		perror("bind");
		goto error;
	}

	return fd;

error:
	return ret;
}

/*
 * 	lttcomm_listen_unix_sock
 *
 * 	Make the socket listen using MAX_LISTEN.
 */
int lttcomm_listen_unix_sock(int sock)
{
	int ret;

	ret = listen(sock, MAX_LISTEN);
	if (ret < 0) {
		perror("listen");
	}

	return ret;
}

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

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

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

	ret = recvmsg(sock, &msg, 0);
	if (ret < 0) {
		perror("recvmsg");
	}

	return ret;
}

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

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

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

	ret = sendmsg(sock, &msg, 0);
	if (ret < 0) {
		perror("sendmsg");
	}

	return ret;
}

/*
 *  lttcomm_close_unix_sock
 *
 *  Shutdown cleanly a unix socket.
 */
int lttcomm_close_unix_sock(int sock)
{
	int ret;

	/* Shutdown receptions and transmissions */
	ret = shutdown(sock, SHUT_RDWR);
	if (ret < 0) {
		perror("shutdown");
	}

	return ret;
}

/*
 *  lttcomm_send_fds_unix_sock
 *
 *  Send multiple fds on a unix socket.
 */
ssize_t lttcomm_send_fds_unix_sock(int sock, void *buf, int *fds, size_t nb_fd, size_t len)
{
	struct msghdr msg;
	struct cmsghdr *cmptr;
	struct iovec iov[1];
	ssize_t ret = -1;
	unsigned int sizeof_fds = nb_fd * sizeof(int);
	char tmp[CMSG_SPACE(sizeof_fds)];

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

	msg.msg_control = (caddr_t)tmp;
	msg.msg_controllen = CMSG_LEN(sizeof_fds);

	cmptr = CMSG_FIRSTHDR(&msg);
	cmptr->cmsg_len = CMSG_LEN(sizeof_fds);
	cmptr->cmsg_level = SOL_SOCKET;
	cmptr->cmsg_type = SCM_RIGHTS;
	memcpy(CMSG_DATA(cmptr), fds, sizeof_fds);

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

	ret = sendmsg(sock, &msg, 0);
	if (ret < 0) {
		perror("sendmsg");
	}

	return ret;
}
Commit	Line	Data
826d496d MD	1	/*
826d496d MD	2	* Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
fac6795d DG	3	*
	4	* This program is free software; you can redistribute it and/or
	5	* modify it under the terms of the GNU General Public License
	6	* as published by the Free Software Foundation; either version 2
	7	* of the License, or (at your option) any later version.
	8	*
	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
	13	*
	14	* You should have received a copy of the GNU General Public License
	15	* along with this program; if not, write to the Free Software
	16	* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
fac6795d DG	17	*/
	18
	19	#define _GNU_SOURCE
	20	#include <limits.h>
	21	#include <stdio.h>
	22	#include <stdlib.h>
	23	#include <string.h>
	24	#include <sys/socket.h>
	25	#include <sys/stat.h>
	26	#include <sys/types.h>
	27	#include <sys/un.h>
	28	#include <unistd.h>
	29
	30	#include "liblttsessiondcomm.h"
	31
	32	/*
	33	* Human readable error message.
	34	*/
	35	static const char *lttcomm_readable_code[] = {
	36	[ LTTCOMM_ERR_INDEX(LTTCOMM_OK) ] = "Success",
	37	[ LTTCOMM_ERR_INDEX(LTTCOMM_ERR) ] = "Unknown error",
	38	[ LTTCOMM_ERR_INDEX(LTTCOMM_UND) ] = "Undefined command",
	39	[ LTTCOMM_ERR_INDEX(LTTCOMM_NO_SESSION) ] = "No session found",
	40	[ LTTCOMM_ERR_INDEX(LTTCOMM_LIST_FAIL) ] = "Unable to list traceable apps",
e065084a	41	[ LTTCOMM_ERR_INDEX(LTTCOMM_NO_APPS) ] = "No traceable apps found",
57167058	42	[ LTTCOMM_ERR_INDEX(LTTCOMM_NO_SESS) ] = "No session found",
ce3d728c	43	[ LTTCOMM_ERR_INDEX(LTTCOMM_NO_TRACE) ] = "No trace found",
ca95a216	44	[ LTTCOMM_ERR_INDEX(LTTCOMM_FATAL) ] = "Fatal error of the session daemon",
df0da139	45	[ LTTCOMM_ERR_INDEX(LTTCOMM_CREATE_FAIL) ] = "Create trace failed",
379473d2	46	[ LTTCOMM_ERR_INDEX(LTTCOMM_START_FAIL) ] = "Start trace failed",
520ff687	47	[ LTTCOMM_ERR_INDEX(LTTCOMM_STOP_FAIL) ] = "Stop trace failed",
379473d2 DG	48	[ LTTCOMM_ERR_INDEX(LTTCOMM_NO_TRACEABLE) ] = "App is not traceable",
379473d2 DG	49	[ LTTCOMM_ERR_INDEX(LTTCOMM_SELECT_SESS) ] = "A session MUST be selected",
27673bb6	50	[ LTTCOMM_ERR_INDEX(LTTCOMM_EXIST_SESS) ] = "Session name already exist",
20fe2104 DG	51	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_NA) ] = "Kernel tracer not available",
	52	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_SESS_FAIL) ] = "Kernel create session failed",
	53	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_FAIL) ] = "Kernel create channel failed",
f34daff7 DG	54	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_ENABLE_FAIL) ] = "Enable kernel event failed",
f34daff7 DG	55	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_DISABLE_FAIL) ] = "Disable kernel event failed",
aaf26714	56	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_META_FAIL) ] = "Opening metadata failed",
8c0faa1d DG	57	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_START_FAIL) ] = "Starting kernel trace failed",
	58	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_STOP_FAIL) ] = "Stoping kernel trace failed",
	59	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CONSUMER_FAIL) ] = "Kernel consumer start failed",
	60	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_STREAM_FAIL) ] = "Kernel create stream failed",
	61	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_DIR_FAIL) ] = "Kernel trace directory creation failed",
	62	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_DIR_EXIST) ] = "Kernel trace directory already exist",
84291629	63	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_NO_SESSION) ] = "No kernel session found",
d4a1283e JD	64	[ LTTCOMM_ERR_INDEX(KCONSUMERD_COMMAND_SOCK_READY) ] = "Kconsumerd command socket ready",
	65	[ LTTCOMM_ERR_INDEX(KCONSUMERD_SUCCESS_RECV_FD) ] = "Kconsumerd success on receiving fds",
	66	[ LTTCOMM_ERR_INDEX(KCONSUMERD_ERROR_RECV_FD) ] = "Kconsumerd error on receiving fds",
	67	[ LTTCOMM_ERR_INDEX(KCONSUMERD_POLL_ERROR) ] = "Kconsumerd error in polling thread",
	68	[ LTTCOMM_ERR_INDEX(KCONSUMERD_POLL_NVAL) ] = "Kconsumerd polling on closed fd",
	69	[ LTTCOMM_ERR_INDEX(KCONSUMERD_POLL_HUP) ] = "Kconsumerd all fd hung up",
	70	[ LTTCOMM_ERR_INDEX(KCONSUMERD_EXIT_SUCCESS) ] = "Kconsumerd exiting normally",
	71	[ LTTCOMM_ERR_INDEX(KCONSUMERD_EXIT_FAILURE) ] = "Kconsumerd exiting on error",
	72	[ LTTCOMM_ERR_INDEX(KCONSUMERD_OUTFD_ERROR) ] = "Kconsumerd error opening the tracefile",
0632499a JD	73	[ LTTCOMM_ERR_INDEX(KCONSUMERD_SPLICE_EBADF) ] = "Kconsumerd splice EBADF",
	74	[ LTTCOMM_ERR_INDEX(KCONSUMERD_SPLICE_EINVAL) ] = "Kconsumerd splice EINVAL",
	75	[ LTTCOMM_ERR_INDEX(KCONSUMERD_SPLICE_ENOMEM) ] = "Kconsumerd splice ENOMEM",
	76	[ LTTCOMM_ERR_INDEX(KCONSUMERD_SPLICE_ESPIPE) ] = "Kconsumerd splice ESPIPE",
894be886	77	[ LTTCOMM_ERR_INDEX(LTTCOMM_NO_EVENT) ] = "No event found",
fac6795d DG	78	};
	79
	80	/*
	81	* lttcom_get_readable_code
	82	*
	83	* Return ptr to string representing a human readable
	84	* error code from the lttcomm_return_code enum.
	85	*
	86	* These code MUST be negative in other to treat that
	87	* as an error value.
	88	*/
	89	const char *lttcomm_get_readable_code(enum lttcomm_return_code code)
	90	{
	91	int tmp_code = -code;
	92
	93	if (tmp_code >= LTTCOMM_OK && tmp_code < LTTCOMM_NR) {
	94	return lttcomm_readable_code[LTTCOMM_ERR_INDEX(tmp_code)];
	95	}
	96
	97	return "Unknown error code";
	98	}
	99
	100	/*
	101	* lttcomm_connect_unix_sock
	102	*
	103	* Connect to unix socket using the path name.
	104	*/
	105	int lttcomm_connect_unix_sock(const char *pathname)
	106	{
686204ab MD	107	struct sockaddr_un sun;
686204ab MD	108	int fd;
fac6795d DG	109	int ret = 1;
fac6795d DG	110
686204ab	111	fd = socket(PF_UNIX, SOCK_STREAM, 0);
fac6795d DG	112	if (fd < 0) {
	113	perror("socket");
	114	goto error;
	115	}
	116
686204ab MD	117	memset(&sun, 0, sizeof(sun));
	118	sun.sun_family = AF_UNIX;
	119	strncpy(sun.sun_path, pathname, sizeof(sun.sun_path));
fac6795d	120
686204ab MD	121	ret = connect(fd, (struct sockaddr *) &sun, sizeof(sun));
	122	if (ret < 0) {
	123	perror("connect");
fac6795d	124	goto error;
686204ab	125	}
fac6795d	126
686204ab	127	return fd;
fac6795d DG	128
	129	error:
	130	return -1;
	131	}
	132
	133	/*
	134	* lttcomm_accept_unix_sock
	135	*
	136	* Do an accept(2) on the sock and return the
	137	* new file descriptor. The socket MUST be bind(2) before.
	138	*/
	139	int lttcomm_accept_unix_sock(int sock)
	140	{
	141	int new_fd;
	142	struct sockaddr_un sun;
	143	socklen_t len = 0;
	144
	145	/* Blocking call */
	146	new_fd = accept(sock, (struct sockaddr *) &sun, &len);
	147	if (new_fd < 0) {
	148	perror("accept");
	149	goto error;
	150	}
	151
	152	return new_fd;
	153
	154	error:
	155	return -1;
	156	}
	157
	158	/*
	159	* lttcomm_create_unix_sock
	160	*
	161	* Creates a AF_UNIX local socket using pathname
	162	* bind the socket upon creation and return the fd.
	163	*/
	164	int lttcomm_create_unix_sock(const char *pathname)
	165	{
	166	struct sockaddr_un sun;
	167	int fd;
	168	int ret = -1;
	169
	170	/* Create server socket */
	171	if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) {
	172	perror("socket");
	173	goto error;
	174	}
	175
	176	memset(&sun, 0, sizeof(sun));
	177	sun.sun_family = AF_UNIX;
	178	strncpy(sun.sun_path, pathname, strlen(pathname));
	179
	180	ret = bind(fd, (struct sockaddr *) &sun, sizeof(sun));
	181	if (ret < 0) {
	182	perror("bind");
	183	goto error;
	184	}
	185
	186	return fd;
	187
	188	error:
	189	return ret;
	190	}
	191
192	/*
193	* lttcomm_listen_unix_sock
194	*
195	* Make the socket listen using MAX_LISTEN.
196	*/
197	int lttcomm_listen_unix_sock(int sock)
198	{
199	int ret;
200
201	ret = listen(sock, MAX_LISTEN);
202	if (ret < 0) {
203	perror("listen");
204	}
205
206	return ret;
207	}
208
209	/*
210	* lttcomm_recv_unix_sock
211	*
212	* Receive data of size len in put that data into
213	* the buf param. Using recvmsg API.
214	* Return the size of received data.
215	*/
216	ssize_t lttcomm_recv_unix_sock(int sock, void *buf, size_t len)
217	{
218	struct msghdr msg;
219	struct iovec iov[1];
220	ssize_t ret = -1;
221
222	memset(&msg, 0, sizeof(msg));
223
224	iov[0].iov_base = buf;
225	iov[0].iov_len = len;
226	msg.msg_iov = iov;
227	msg.msg_iovlen = 1;
228
229	ret = recvmsg(sock, &msg, 0);
230	if (ret < 0) {
231	perror("recvmsg");
232	}
233
234	return ret;
235	}
236
237	/*
238	* lttcomm_send_unix_sock
239	*
240	* Send buf data of size len. Using sendmsg API.
241	* Return the size of sent data.
242	*/
243	ssize_t lttcomm_send_unix_sock(int sock, void *buf, size_t len)
244	{
245	struct msghdr msg;
246	struct iovec iov[1];
247	ssize_t ret = -1;
248
249	memset(&msg, 0, sizeof(msg));
250
251	iov[0].iov_base = buf;
252	iov[0].iov_len = len;
253	msg.msg_iov = iov;
254	msg.msg_iovlen = 1;
255
256	ret = sendmsg(sock, &msg, 0);
257	if (ret < 0) {
258	perror("sendmsg");
259	}
260
261	return ret;
262	}
87378cf5 DG	263
	264	/*
	265	* lttcomm_close_unix_sock
	266	*
	267	* Shutdown cleanly a unix socket.
	268	*/
	269	int lttcomm_close_unix_sock(int sock)
	270	{
	271	int ret;
	272
	273	/* Shutdown receptions and transmissions */
	274	ret = shutdown(sock, SHUT_RDWR);
	275	if (ret < 0) {
	276	perror("shutdown");
	277	}
	278
	279	return ret;
	280	}
8c0faa1d DG	281
	282	/*
	283	* lttcomm_send_fds_unix_sock
	284	*
	285	* Send multiple fds on a unix socket.
	286	*/
	287	ssize_t lttcomm_send_fds_unix_sock(int sock, void buf, int fds, size_t nb_fd, size_t len)
	288	{
	289	struct msghdr msg;
	290	struct cmsghdr *cmptr;
	291	struct iovec iov[1];
	292	ssize_t ret = -1;
	293	unsigned int sizeof_fds = nb_fd * sizeof(int);
	294	char tmp[CMSG_SPACE(sizeof_fds)];
	295
	296	memset(&msg, 0, sizeof(msg));
	297
	298	msg.msg_control = (caddr_t)tmp;
	299	msg.msg_controllen = CMSG_LEN(sizeof_fds);
	300
	301	cmptr = CMSG_FIRSTHDR(&msg);
	302	cmptr->cmsg_len = CMSG_LEN(sizeof_fds);
	303	cmptr->cmsg_level = SOL_SOCKET;
	304	cmptr->cmsg_type = SCM_RIGHTS;
	305	memcpy(CMSG_DATA(cmptr), fds, sizeof_fds);
	306
	307	iov[0].iov_base = buf;
	308	iov[0].iov_len = len;
	309	msg.msg_iov = iov;
	310	msg.msg_iovlen = 1;
	311
	312	ret = sendmsg(sock, &msg, 0);
	313	if (ret < 0) {
	314	perror("sendmsg");
	315	}
	316
	317	return ret;
	318	}