[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_SESS_NOT_FOUND) ] = "Session name not 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_CHAN_NOT_FOUND) ] = "Kernel channel not found",
	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_DISABLE_FAIL) ] = "Disable kernel channel failed",
	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_ENABLE_FAIL) ] = "Enable kernel 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(LTTCOMM_KERN_LIST_FAIL) ] = "Listing kernel events failed",
	[ 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",
f3ed775e	42	[ LTTCOMM_ERR_INDEX(LTTCOMM_SESS_NOT_FOUND) ] = "Session name not 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",
f3ed775e	54	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_NOT_FOUND) ] = "Kernel channel not found",
26cc6b4e	55	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_DISABLE_FAIL) ] = "Disable kernel channel failed",
d36b8583	56	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_ENABLE_FAIL) ] = "Enable kernel channel failed",
f34daff7 DG	57	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_ENABLE_FAIL) ] = "Enable kernel event failed",
f34daff7 DG	58	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_DISABLE_FAIL) ] = "Disable kernel event failed",
aaf26714	59	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_META_FAIL) ] = "Opening metadata failed",
8c0faa1d DG	60	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_START_FAIL) ] = "Starting kernel trace failed",
	61	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_STOP_FAIL) ] = "Stoping kernel trace failed",
	62	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CONSUMER_FAIL) ] = "Kernel consumer start failed",
	63	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_STREAM_FAIL) ] = "Kernel create stream failed",
	64	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_DIR_FAIL) ] = "Kernel trace directory creation failed",
	65	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_DIR_EXIST) ] = "Kernel trace directory already exist",
84291629	66	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_NO_SESSION) ] = "No kernel session found",
2ef84c95	67	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_LIST_FAIL) ] = "Listing kernel events failed",
d4a1283e JD	68	[ LTTCOMM_ERR_INDEX(KCONSUMERD_COMMAND_SOCK_READY) ] = "Kconsumerd command socket ready",
	69	[ LTTCOMM_ERR_INDEX(KCONSUMERD_SUCCESS_RECV_FD) ] = "Kconsumerd success on receiving fds",
	70	[ LTTCOMM_ERR_INDEX(KCONSUMERD_ERROR_RECV_FD) ] = "Kconsumerd error on receiving fds",
	71	[ LTTCOMM_ERR_INDEX(KCONSUMERD_POLL_ERROR) ] = "Kconsumerd error in polling thread",
	72	[ LTTCOMM_ERR_INDEX(KCONSUMERD_POLL_NVAL) ] = "Kconsumerd polling on closed fd",
	73	[ LTTCOMM_ERR_INDEX(KCONSUMERD_POLL_HUP) ] = "Kconsumerd all fd hung up",
	74	[ LTTCOMM_ERR_INDEX(KCONSUMERD_EXIT_SUCCESS) ] = "Kconsumerd exiting normally",
	75	[ LTTCOMM_ERR_INDEX(KCONSUMERD_EXIT_FAILURE) ] = "Kconsumerd exiting on error",
	76	[ LTTCOMM_ERR_INDEX(KCONSUMERD_OUTFD_ERROR) ] = "Kconsumerd error opening the tracefile",
0632499a JD	77	[ LTTCOMM_ERR_INDEX(KCONSUMERD_SPLICE_EBADF) ] = "Kconsumerd splice EBADF",
	78	[ LTTCOMM_ERR_INDEX(KCONSUMERD_SPLICE_EINVAL) ] = "Kconsumerd splice EINVAL",
	79	[ LTTCOMM_ERR_INDEX(KCONSUMERD_SPLICE_ENOMEM) ] = "Kconsumerd splice ENOMEM",
	80	[ LTTCOMM_ERR_INDEX(KCONSUMERD_SPLICE_ESPIPE) ] = "Kconsumerd splice ESPIPE",
894be886	81	[ LTTCOMM_ERR_INDEX(LTTCOMM_NO_EVENT) ] = "No event found",
fac6795d DG	82	};
	83
	84	/*
	85	* lttcom_get_readable_code
	86	*
	87	* Return ptr to string representing a human readable
	88	* error code from the lttcomm_return_code enum.
	89	*
	90	* These code MUST be negative in other to treat that
	91	* as an error value.
	92	*/
	93	const char *lttcomm_get_readable_code(enum lttcomm_return_code code)
	94	{
	95	int tmp_code = -code;
	96
	97	if (tmp_code >= LTTCOMM_OK && tmp_code < LTTCOMM_NR) {
	98	return lttcomm_readable_code[LTTCOMM_ERR_INDEX(tmp_code)];
	99	}
	100
	101	return "Unknown error code";
	102	}
	103
	104	/*
	105	* lttcomm_connect_unix_sock
	106	*
	107	* Connect to unix socket using the path name.
	108	*/
	109	int lttcomm_connect_unix_sock(const char *pathname)
	110	{
686204ab MD	111	struct sockaddr_un sun;
686204ab MD	112	int fd;
fac6795d DG	113	int ret = 1;
fac6795d DG	114
686204ab	115	fd = socket(PF_UNIX, SOCK_STREAM, 0);
fac6795d DG	116	if (fd < 0) {
	117	perror("socket");
	118	goto error;
	119	}
	120
686204ab MD	121	memset(&sun, 0, sizeof(sun));
	122	sun.sun_family = AF_UNIX;
	123	strncpy(sun.sun_path, pathname, sizeof(sun.sun_path));
fac6795d	124
686204ab MD	125	ret = connect(fd, (struct sockaddr *) &sun, sizeof(sun));
	126	if (ret < 0) {
	127	perror("connect");
fac6795d	128	goto error;
686204ab	129	}
fac6795d	130
686204ab	131	return fd;
fac6795d DG	132
	133	error:
	134	return -1;
	135	}
	136
	137	/*
	138	* lttcomm_accept_unix_sock
	139	*
	140	* Do an accept(2) on the sock and return the
	141	* new file descriptor. The socket MUST be bind(2) before.
	142	*/
	143	int lttcomm_accept_unix_sock(int sock)
	144	{
	145	int new_fd;
	146	struct sockaddr_un sun;
	147	socklen_t len = 0;
	148
	149	/* Blocking call */
	150	new_fd = accept(sock, (struct sockaddr *) &sun, &len);
	151	if (new_fd < 0) {
	152	perror("accept");
	153	goto error;
	154	}
	155
	156	return new_fd;
	157
	158	error:
	159	return -1;
	160	}
	161
	162	/*
	163	* lttcomm_create_unix_sock
	164	*
	165	* Creates a AF_UNIX local socket using pathname
	166	* bind the socket upon creation and return the fd.
	167	*/
	168	int lttcomm_create_unix_sock(const char *pathname)
	169	{
	170	struct sockaddr_un sun;
	171	int fd;
	172	int ret = -1;
	173
	174	/* Create server socket */
	175	if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) {
	176	perror("socket");
	177	goto error;
	178	}
	179
	180	memset(&sun, 0, sizeof(sun));
	181	sun.sun_family = AF_UNIX;
	182	strncpy(sun.sun_path, pathname, strlen(pathname));
	183
	184	ret = bind(fd, (struct sockaddr *) &sun, sizeof(sun));
	185	if (ret < 0) {
	186	perror("bind");
	187	goto error;
	188	}
	189
	190	return fd;
	191
	192	error:
	193	return ret;
	194	}
	195
196	/*
197	* lttcomm_listen_unix_sock
198	*
199	* Make the socket listen using MAX_LISTEN.
200	*/
201	int lttcomm_listen_unix_sock(int sock)
202	{
203	int ret;
204
205	ret = listen(sock, MAX_LISTEN);
206	if (ret < 0) {
207	perror("listen");
208	}
209
210	return ret;
211	}
212
213	/*
214	* lttcomm_recv_unix_sock
215	*
216	* Receive data of size len in put that data into
217	* the buf param. Using recvmsg API.
218	* Return the size of received data.
219	*/
220	ssize_t lttcomm_recv_unix_sock(int sock, void *buf, size_t len)
221	{
222	struct msghdr msg;
223	struct iovec iov[1];
224	ssize_t ret = -1;
225
226	memset(&msg, 0, sizeof(msg));
227
228	iov[0].iov_base = buf;
229	iov[0].iov_len = len;
230	msg.msg_iov = iov;
231	msg.msg_iovlen = 1;
232
233	ret = recvmsg(sock, &msg, 0);
234	if (ret < 0) {
235	perror("recvmsg");
236	}
237
238	return ret;
239	}
240
241	/*
242	* lttcomm_send_unix_sock
243	*
244	* Send buf data of size len. Using sendmsg API.
245	* Return the size of sent data.
246	*/
247	ssize_t lttcomm_send_unix_sock(int sock, void *buf, size_t len)
248	{
249	struct msghdr msg;
250	struct iovec iov[1];
251	ssize_t ret = -1;
252
253	memset(&msg, 0, sizeof(msg));
254
255	iov[0].iov_base = buf;
256	iov[0].iov_len = len;
257	msg.msg_iov = iov;
258	msg.msg_iovlen = 1;
259
260	ret = sendmsg(sock, &msg, 0);
261	if (ret < 0) {
262	perror("sendmsg");
263	}
264
265	return ret;
266	}
87378cf5 DG	267
	268	/*
	269	* lttcomm_close_unix_sock
	270	*
	271	* Shutdown cleanly a unix socket.
	272	*/
	273	int lttcomm_close_unix_sock(int sock)
	274	{
	275	int ret;
	276
	277	/* Shutdown receptions and transmissions */
	278	ret = shutdown(sock, SHUT_RDWR);
	279	if (ret < 0) {
	280	perror("shutdown");
	281	}
	282
	283	return ret;
	284	}
8c0faa1d DG	285
	286	/*
	287	* lttcomm_send_fds_unix_sock
	288	*
	289	* Send multiple fds on a unix socket.
	290	*/
	291	ssize_t lttcomm_send_fds_unix_sock(int sock, void buf, int fds, size_t nb_fd, size_t len)
	292	{
	293	struct msghdr msg;
	294	struct cmsghdr *cmptr;
	295	struct iovec iov[1];
	296	ssize_t ret = -1;
	297	unsigned int sizeof_fds = nb_fd * sizeof(int);
	298	char tmp[CMSG_SPACE(sizeof_fds)];
	299
	300	memset(&msg, 0, sizeof(msg));
	301
	302	msg.msg_control = (caddr_t)tmp;
	303	msg.msg_controllen = CMSG_LEN(sizeof_fds);
	304
	305	cmptr = CMSG_FIRSTHDR(&msg);
	306	cmptr->cmsg_len = CMSG_LEN(sizeof_fds);
	307	cmptr->cmsg_level = SOL_SOCKET;
	308	cmptr->cmsg_type = SCM_RIGHTS;
	309	memcpy(CMSG_DATA(cmptr), fds, sizeof_fds);
	310
	311	iov[0].iov_base = buf;
	312	iov[0].iov_len = len;
	313	msg.msg_iov = iov;
	314	msg.msg_iovlen = 1;
	315
	316	ret = sendmsg(sock, &msg, 0);
	317	if (ret < 0) {
	318	perror("sendmsg");
	319	}
	320
	321	return ret;
	322	}