Fix UST define in global headers
[lttng-tools.git] / ltt-sessiond / ust-comm.c
1 /*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
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; only version 2
7 * of the License.
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.
17 */
18
19 #include <stdlib.h>
20
21 #include <lttngerr.h>
22
23 #include "ust-comm.h"
24
25 /*
26 * Send msg containing a command to an UST application via sock and wait for
27 * the reply.
28 *
29 * Return the replied structure or NULL.
30 */
31 struct lttcomm_ust_reply *ustcomm_send_command(int sock,
32 struct lttcomm_ust_msg *msg)
33 {
34 ssize_t len;
35 struct lttcomm_ust_reply *reply;
36
37 /* Extra safety */
38 if (msg == NULL || sock < 0) {
39 goto error;
40 }
41
42 DBG("Sending UST command %d to sock %d", msg->cmd, sock);
43
44 /* Send UST msg */
45 len = lttcomm_send_unix_sock(sock, msg, sizeof(*msg));
46 if (len < 0) {
47 goto error;
48 }
49
50 reply = malloc(sizeof(struct lttcomm_ust_reply));
51 if (reply == NULL) {
52 perror("malloc ust reply");
53 goto error;
54 }
55
56 DBG("Receiving UST reply on sock %d", sock);
57
58 /* Get UST reply */
59 len = lttcomm_recv_unix_sock(sock, reply, sizeof(*reply));
60 if (len < 0 || len < sizeof(*reply)) {
61 goto error;
62 }
63
64 return reply;
65
66 error:
67 return NULL;
68 }
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