[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; only version 2
 * of the License.
 * 
 * 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 <assert.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_NOT_IMPLEMENTED) ] = "Not implemented",
	[ LTTCOMM_ERR_INDEX(LTTCOMM_UNKNOWN_DOMAIN) ] = "Unknown tracing domain",
	[ 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_EVENT_EXIST) ] = "Kernel event already exists",
	[ 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_CONTEXT_FAIL) ] = "Add kernel context 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) ] = "Event not 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 = { 0 };
	struct iovec iov[1];
	ssize_t ret = -1;

	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 = { 0 };
	struct iovec iov[1];
	ssize_t ret = -1;

	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 = { 0 };
	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)];

	/*
	 * Note: the consumerd receiver only supports receiving one FD at a
	 * time for now.
	 */
	assert(nb_fd == 1);

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

	cmptr = CMSG_FIRSTHDR(&msg);
	cmptr->cmsg_level = SOL_SOCKET;
	cmptr->cmsg_type = SCM_RIGHTS;
	cmptr->cmsg_len = CMSG_LEN(sizeof_fds);
	memcpy(CMSG_DATA(cmptr), fds, sizeof_fds);
	/* Sum of the length of all control messages in the buffer: */
	msg.msg_controllen = cmptr->cmsg_len;

	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
82a3637f DG	6	* as published by the Free Software Foundation; only version 2
82a3637f DG	7	* of the License.
fac6795d DG	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>
159c7ff4	29	#include <assert.h>
fac6795d DG	30
	31	#include "liblttsessiondcomm.h"
	32
	33	/*
	34	* Human readable error message.
	35	*/
	36	static const char *lttcomm_readable_code[] = {
	37	[ LTTCOMM_ERR_INDEX(LTTCOMM_OK) ] = "Success",
	38	[ LTTCOMM_ERR_INDEX(LTTCOMM_ERR) ] = "Unknown error",
	39	[ LTTCOMM_ERR_INDEX(LTTCOMM_UND) ] = "Undefined command",
7d29a247 DG	40	[ LTTCOMM_ERR_INDEX(LTTCOMM_NOT_IMPLEMENTED) ] = "Not implemented",
7d29a247 DG	41	[ LTTCOMM_ERR_INDEX(LTTCOMM_UNKNOWN_DOMAIN) ] = "Unknown tracing domain",
fac6795d DG	42	[ LTTCOMM_ERR_INDEX(LTTCOMM_NO_SESSION) ] = "No session found",
fac6795d DG	43	[ LTTCOMM_ERR_INDEX(LTTCOMM_LIST_FAIL) ] = "Unable to list traceable apps",
e065084a	44	[ LTTCOMM_ERR_INDEX(LTTCOMM_NO_APPS) ] = "No traceable apps found",
f3ed775e	45	[ LTTCOMM_ERR_INDEX(LTTCOMM_SESS_NOT_FOUND) ] = "Session name not found",
ce3d728c	46	[ LTTCOMM_ERR_INDEX(LTTCOMM_NO_TRACE) ] = "No trace found",
ca95a216	47	[ LTTCOMM_ERR_INDEX(LTTCOMM_FATAL) ] = "Fatal error of the session daemon",
df0da139	48	[ LTTCOMM_ERR_INDEX(LTTCOMM_CREATE_FAIL) ] = "Create trace failed",
379473d2	49	[ LTTCOMM_ERR_INDEX(LTTCOMM_START_FAIL) ] = "Start trace failed",
520ff687	50	[ LTTCOMM_ERR_INDEX(LTTCOMM_STOP_FAIL) ] = "Stop trace failed",
379473d2 DG	51	[ LTTCOMM_ERR_INDEX(LTTCOMM_NO_TRACEABLE) ] = "App is not traceable",
379473d2 DG	52	[ LTTCOMM_ERR_INDEX(LTTCOMM_SELECT_SESS) ] = "A session MUST be selected",
27673bb6	53	[ LTTCOMM_ERR_INDEX(LTTCOMM_EXIST_SESS) ] = "Session name already exist",
20fe2104	54	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_NA) ] = "Kernel tracer not available",
7d29a247	55	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_EVENT_EXIST) ] = "Kernel event already exists",
20fe2104 DG	56	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_SESS_FAIL) ] = "Kernel create session failed",
20fe2104 DG	57	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_FAIL) ] = "Kernel create channel failed",
f3ed775e	58	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_NOT_FOUND) ] = "Kernel channel not found",
26cc6b4e	59	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_DISABLE_FAIL) ] = "Disable kernel channel failed",
d36b8583	60	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_ENABLE_FAIL) ] = "Enable kernel channel failed",
d65106b1	61	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CONTEXT_FAIL) ] = "Add kernel context failed",
f34daff7 DG	62	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_ENABLE_FAIL) ] = "Enable kernel event failed",
f34daff7 DG	63	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_DISABLE_FAIL) ] = "Disable kernel event failed",
aaf26714	64	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_META_FAIL) ] = "Opening metadata failed",
8c0faa1d DG	65	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_START_FAIL) ] = "Starting kernel trace failed",
	66	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_STOP_FAIL) ] = "Stoping kernel trace failed",
	67	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CONSUMER_FAIL) ] = "Kernel consumer start failed",
	68	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_STREAM_FAIL) ] = "Kernel create stream failed",
	69	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_DIR_FAIL) ] = "Kernel trace directory creation failed",
	70	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_DIR_EXIST) ] = "Kernel trace directory already exist",
84291629	71	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_NO_SESSION) ] = "No kernel session found",
2ef84c95	72	[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_LIST_FAIL) ] = "Listing kernel events failed",
d4a1283e JD	73	[ LTTCOMM_ERR_INDEX(KCONSUMERD_COMMAND_SOCK_READY) ] = "Kconsumerd command socket ready",
	74	[ LTTCOMM_ERR_INDEX(KCONSUMERD_SUCCESS_RECV_FD) ] = "Kconsumerd success on receiving fds",
	75	[ LTTCOMM_ERR_INDEX(KCONSUMERD_ERROR_RECV_FD) ] = "Kconsumerd error on receiving fds",
	76	[ LTTCOMM_ERR_INDEX(KCONSUMERD_POLL_ERROR) ] = "Kconsumerd error in polling thread",
	77	[ LTTCOMM_ERR_INDEX(KCONSUMERD_POLL_NVAL) ] = "Kconsumerd polling on closed fd",
	78	[ LTTCOMM_ERR_INDEX(KCONSUMERD_POLL_HUP) ] = "Kconsumerd all fd hung up",
	79	[ LTTCOMM_ERR_INDEX(KCONSUMERD_EXIT_SUCCESS) ] = "Kconsumerd exiting normally",
	80	[ LTTCOMM_ERR_INDEX(KCONSUMERD_EXIT_FAILURE) ] = "Kconsumerd exiting on error",
	81	[ LTTCOMM_ERR_INDEX(KCONSUMERD_OUTFD_ERROR) ] = "Kconsumerd error opening the tracefile",
0632499a JD	82	[ LTTCOMM_ERR_INDEX(KCONSUMERD_SPLICE_EBADF) ] = "Kconsumerd splice EBADF",
	83	[ LTTCOMM_ERR_INDEX(KCONSUMERD_SPLICE_EINVAL) ] = "Kconsumerd splice EINVAL",
	84	[ LTTCOMM_ERR_INDEX(KCONSUMERD_SPLICE_ENOMEM) ] = "Kconsumerd splice ENOMEM",
	85	[ LTTCOMM_ERR_INDEX(KCONSUMERD_SPLICE_ESPIPE) ] = "Kconsumerd splice ESPIPE",
d65106b1	86	[ LTTCOMM_ERR_INDEX(LTTCOMM_NO_EVENT) ] = "Event not found",
fac6795d DG	87	};
	88
	89	/*
	90	* lttcom_get_readable_code
	91	*
	92	* Return ptr to string representing a human readable
	93	* error code from the lttcomm_return_code enum.
	94	*
	95	* These code MUST be negative in other to treat that
	96	* as an error value.
	97	*/
	98	const char *lttcomm_get_readable_code(enum lttcomm_return_code code)
	99	{
	100	int tmp_code = -code;
	101
	102	if (tmp_code >= LTTCOMM_OK && tmp_code < LTTCOMM_NR) {
	103	return lttcomm_readable_code[LTTCOMM_ERR_INDEX(tmp_code)];
	104	}
	105
	106	return "Unknown error code";
	107	}
	108
	109	/*
	110	* lttcomm_connect_unix_sock
	111	*
	112	* Connect to unix socket using the path name.
	113	*/
	114	int lttcomm_connect_unix_sock(const char *pathname)
	115	{
686204ab MD	116	struct sockaddr_un sun;
686204ab MD	117	int fd;
fac6795d DG	118	int ret = 1;
fac6795d DG	119
686204ab	120	fd = socket(PF_UNIX, SOCK_STREAM, 0);
fac6795d DG	121	if (fd < 0) {
	122	perror("socket");
	123	goto error;
	124	}
	125
686204ab MD	126	memset(&sun, 0, sizeof(sun));
	127	sun.sun_family = AF_UNIX;
	128	strncpy(sun.sun_path, pathname, sizeof(sun.sun_path));
fac6795d	129
686204ab MD	130	ret = connect(fd, (struct sockaddr *) &sun, sizeof(sun));
	131	if (ret < 0) {
	132	perror("connect");
fac6795d	133	goto error;
686204ab	134	}
fac6795d	135
686204ab	136	return fd;
fac6795d DG	137
	138	error:
	139	return -1;
	140	}
	141
	142	/*
	143	* lttcomm_accept_unix_sock
	144	*
	145	* Do an accept(2) on the sock and return the
	146	* new file descriptor. The socket MUST be bind(2) before.
	147	*/
	148	int lttcomm_accept_unix_sock(int sock)
	149	{
	150	int new_fd;
	151	struct sockaddr_un sun;
	152	socklen_t len = 0;
	153
	154	/* Blocking call */
	155	new_fd = accept(sock, (struct sockaddr *) &sun, &len);
	156	if (new_fd < 0) {
	157	perror("accept");
	158	goto error;
	159	}
	160
	161	return new_fd;
	162
	163	error:
	164	return -1;
	165	}
	166
	167	/*
	168	* lttcomm_create_unix_sock
	169	*
	170	* Creates a AF_UNIX local socket using pathname
	171	* bind the socket upon creation and return the fd.
	172	*/
	173	int lttcomm_create_unix_sock(const char *pathname)
	174	{
	175	struct sockaddr_un sun;
	176	int fd;
	177	int ret = -1;
	178
	179	/* Create server socket */
	180	if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) {
	181	perror("socket");
	182	goto error;
	183	}
	184
	185	memset(&sun, 0, sizeof(sun));
	186	sun.sun_family = AF_UNIX;
	187	strncpy(sun.sun_path, pathname, strlen(pathname));
	188
	189	ret = bind(fd, (struct sockaddr *) &sun, sizeof(sun));
	190	if (ret < 0) {
	191	perror("bind");
	192	goto error;
	193	}
	194
	195	return fd;
	196
	197	error:
	198	return ret;
	199	}
	200
201	/*
202	* lttcomm_listen_unix_sock
203	*
204	* Make the socket listen using MAX_LISTEN.
205	*/
206	int lttcomm_listen_unix_sock(int sock)
207	{
208	int ret;
209
210	ret = listen(sock, MAX_LISTEN);
211	if (ret < 0) {
212	perror("listen");
213	}
214
215	return ret;
216	}
217
218	/*
219	* lttcomm_recv_unix_sock
220	*
221	* Receive data of size len in put that data into
222	* the buf param. Using recvmsg API.
223	* Return the size of received data.
224	*/
225	ssize_t lttcomm_recv_unix_sock(int sock, void *buf, size_t len)
226	{
159c7ff4	227	struct msghdr msg = { 0 };
fac6795d DG	228	struct iovec iov[1];
	229	ssize_t ret = -1;
	230
fac6795d DG	231	iov[0].iov_base = buf;
	232	iov[0].iov_len = len;
	233	msg.msg_iov = iov;
	234	msg.msg_iovlen = 1;
	235
	236	ret = recvmsg(sock, &msg, 0);
	237	if (ret < 0) {
	238	perror("recvmsg");
	239	}
	240
	241	return ret;
	242	}
	243
	244	/*
	245	* lttcomm_send_unix_sock
	246	*
	247	* Send buf data of size len. Using sendmsg API.
	248	* Return the size of sent data.
	249	*/
	250	ssize_t lttcomm_send_unix_sock(int sock, void *buf, size_t len)
	251	{
159c7ff4	252	struct msghdr msg = { 0 };
fac6795d DG	253	struct iovec iov[1];
	254	ssize_t ret = -1;
	255
fac6795d DG	256	iov[0].iov_base = buf;
	257	iov[0].iov_len = len;
	258	msg.msg_iov = iov;
	259	msg.msg_iovlen = 1;
	260
	261	ret = sendmsg(sock, &msg, 0);
	262	if (ret < 0) {
	263	perror("sendmsg");
	264	}
	265
	266	return ret;
	267	}
87378cf5 DG	268
	269	/*
	270	* lttcomm_close_unix_sock
	271	*
	272	* Shutdown cleanly a unix socket.
	273	*/
	274	int lttcomm_close_unix_sock(int sock)
	275	{
	276	int ret;
	277
	278	/* Shutdown receptions and transmissions */
	279	ret = shutdown(sock, SHUT_RDWR);
	280	if (ret < 0) {
	281	perror("shutdown");
	282	}
	283
	284	return ret;
	285	}
8c0faa1d DG	286
	287	/*
	288	* lttcomm_send_fds_unix_sock
	289	*
	290	* Send multiple fds on a unix socket.
	291	*/
	292	ssize_t lttcomm_send_fds_unix_sock(int sock, void buf, int fds, size_t nb_fd, size_t len)
	293	{
159c7ff4	294	struct msghdr msg = { 0 };
8c0faa1d DG	295	struct cmsghdr *cmptr;
	296	struct iovec iov[1];
	297	ssize_t ret = -1;
	298	unsigned int sizeof_fds = nb_fd * sizeof(int);
	299	char tmp[CMSG_SPACE(sizeof_fds)];
	300
159c7ff4 MD	301	/*
	302	* Note: the consumerd receiver only supports receiving one FD at a
	303	* time for now.
	304	*/
	305	assert(nb_fd == 1);
8c0faa1d DG	306
	307	msg.msg_control = (caddr_t)tmp;
	308	msg.msg_controllen = CMSG_LEN(sizeof_fds);
	309
	310	cmptr = CMSG_FIRSTHDR(&msg);
8c0faa1d DG	311	cmptr->cmsg_level = SOL_SOCKET;
8c0faa1d DG	312	cmptr->cmsg_type = SCM_RIGHTS;
159c7ff4	313	cmptr->cmsg_len = CMSG_LEN(sizeof_fds);
8c0faa1d	314	memcpy(CMSG_DATA(cmptr), fds, sizeof_fds);
159c7ff4 MD	315	/* Sum of the length of all control messages in the buffer: */
159c7ff4 MD	316	msg.msg_controllen = cmptr->cmsg_len;
8c0faa1d DG	317
	318	iov[0].iov_base = buf;
	319	iov[0].iov_len = len;
	320	msg.msg_iov = iov;
	321	msg.msg_iovlen = 1;
	322
	323	ret = sendmsg(sock, &msg, 0);
	324	if (ret < 0) {
	325	perror("sendmsg");
	326	}
	327
	328	return ret;
	329	}