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 <lttngerr.h>
  20
  21 #include "ust-comm.h"
  22
  23 /*
  24  * Send msg containing a command to an UST application via sock and wait for
  25  * the reply.
  26  *
  27  * Return -1 on error or if reply fails else return 0.
  28  */
  29 int ustcomm_send_command(int sock, struct lttcomm_ust_msg *msg)
  30 {
  31         ssize_t len;
  32         struct lttcomm_ust_reply reply;
  33
  34         DBG("Sending UST command %d to sock %d", msg->cmd, sock);
  35
  36         /* Send UST msg */
  37         len = lttcomm_send_unix_sock(sock, msg, sizeof(*msg));
  38         if (len < 0) {
  39                 goto error;
  40         }
  41
  42         DBG("Receiving UST reply on sock %d", sock);
  43
  44         /* Get UST reply */
  45         len = lttcomm_recv_unix_sock(sock, &reply, sizeof(reply));
  46         if (len < 0) {
  47                 goto error;
  48         }
  49
  50         if (reply.ret_code != LTTCOMM_OK) {
  51                 goto error;
  52         }
  53
  54         return 0;
  55
  56 error:
  57         return -1;
  58 }