ltt-sessiond/ust-ctl.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 #define _GNU_SOURCE
  20 #include <stdlib.h>
  21 #include <stdio.h>
  22 #include <string.h>
  23 #include <unistd.h>
  24
  25 #include <lttng-sessiond-comm.h>
  26 #include <lttngerr.h>
  27
  28 #include "ust-comm.h"
  29 #include "ust-ctl.h"
  30
  31 /*
  32  * Send registration done packet to the application.
  33  */
  34 int ustctl_register_done(int sock)
  35 {
  36         struct lttcomm_ust_msg command;
  37         struct lttcomm_ust_reply *reply;
  38
  39         DBG("Sending register done command to %d", sock);
  40
  41         command.cmd = LTTNG_UST_REGISTER_DONE;
  42         command.handle = LTTNG_UST_ROOT_HANDLE;
  43
  44         reply = ustcomm_send_command(sock, &command);
  45         if (reply == NULL) {
  46                 goto error;
  47         }
  48
  49         if (reply->ret_code != LTTCOMM_OK) {
  50                 DBG("Return code: %s", lttcomm_get_readable_code(reply->ret_code));
  51                 goto error;
  52         }
  53
  54         return 0;
  55
  56 error:
  57         return -1;
  58 }
  59
  60 /*
  61  * Create an UST session on the tracer.
  62  */
  63 int ustctl_create_session(int sock, struct ltt_ust_session *session)
  64 {
  65         struct lttcomm_ust_msg command;
  66         struct lttcomm_ust_reply *reply = NULL;
  67
  68         command.cmd = LTTNG_UST_SESSION;
  69         command.handle = LTTNG_UST_ROOT_HANDLE;
  70
  71         reply = ustcomm_send_command(sock, &command);
  72         if (reply == NULL) {
  73                 goto error;
  74         }
  75
  76         if (reply->ret_code != LTTCOMM_OK) {
  77                 DBG("Return code: %s", lttcomm_get_readable_code(reply->ret_code));
  78                 goto error;
  79         }
  80
  81         /* Save session handle */
  82         session->handle = reply->ret_val;
  83         free(reply);
  84
  85         DBG2("ustctl create session command successful");
  86         return 0;
  87
  88 error:
  89         free(reply);
  90         return -1;
  91 }
  92
  93 /*
  94  * Create UST channel to the tracer.
  95  */
  96 int ustctl_create_channel(int sock, struct ltt_ust_session *session,
  97                 struct lttng_channel *channel)
  98 {
  99         struct lttcomm_ust_msg command;
 100         struct lttcomm_ust_reply *reply = NULL;
 101         struct ltt_ust_channel *uchan;
 102
 103         uchan = trace_ust_create_channel(channel, session->path);
 104         if (uchan == NULL) {
 105                 goto error;
 106         }
 107
 108         memset(&command, 0, sizeof(command));
 109
 110         command.cmd = LTTNG_UST_CHANNEL;
 111         command.handle = session->handle;
 112
 113         /* Copy channel attributes to command */
 114         memcpy(&command.u.channel, &uchan->attr, sizeof(command.u.channel));
 115
 116         reply = ustcomm_send_command(sock, &command);
 117         if (reply == NULL) {
 118                 goto error;
 119         }
 120
 121         if (reply->ret_code != LTTCOMM_OK) {
 122                 DBG("Return code (%d): %s", reply->ret_code,
 123                                 lttcomm_get_readable_code(reply->ret_code));
 124                 goto error;
 125         }
 126
 127         uchan->handle = reply->ret_val;
 128
 129         /* Add channel to session */
 130         cds_list_add(&uchan->list, &session->channels.head);
 131         session->channels.count++;
 132
 133         free(reply);
 134
 135         return 0;
 136
 137 error:
 138         free(reply);
 139         return -1;
 140 }
 141
 142 /*
 143  * Enable UST channel.
 144  */
 145 int ustctl_enable_channel(int sock, struct ltt_ust_session *session,
 146                 struct ltt_ust_channel *chan)
 147 {
 148         struct lttcomm_ust_msg command;
 149         struct lttcomm_ust_reply *reply = NULL;
 150
 151         memset(&command, 0, sizeof(command));
 152
 153         command.cmd = LTTNG_UST_ENABLE;
 154         command.handle = chan->handle;
 155
 156         reply = ustcomm_send_command(sock, &command);
 157         if (reply == NULL) {
 158                 goto error;
 159         }
 160
 161         if (reply->ret_code != LTTCOMM_OK) {
 162                 DBG("Return code (%d): %s", reply->ret_code,
 163                                 lttcomm_get_readable_code(reply->ret_code));
 164                 goto error;
 165         } else if (reply->handle != chan->handle) {
 166                 ERR("Receive wrong handle from UST reply on enable channel");
 167                 goto error;
 168         }
 169
 170         chan->enabled = 1;
 171         free(reply);
 172
 173         DBG2("ustctl enable channel successful for sock %d", sock);
 174         return 0;
 175
 176 error:
 177         free(reply);
 178         return -1;
 179 }
 180
 181 /*
 182  * Disable UST channel.
 183  */
 184 int ustctl_disable_channel(int sock, struct ltt_ust_session *session,
 185                 struct ltt_ust_channel *chan)
 186 {
 187         struct lttcomm_ust_msg command;
 188         struct lttcomm_ust_reply *reply = NULL;
 189
 190         memset(&command, 0, sizeof(command));
 191
 192         command.cmd = LTTNG_UST_DISABLE;
 193         command.handle = chan->handle;
 194
 195         reply = ustcomm_send_command(sock, &command);
 196         if (reply == NULL) {
 197                 goto error;
 198         }
 199
 200         if (reply->ret_code != LTTCOMM_OK) {
 201                 DBG("Return code (%d): %s", reply->ret_code,
 202                                 lttcomm_get_readable_code(reply->ret_code));
 203                 goto error;
 204         } else if (reply->handle != chan->handle) {
 205                 ERR("Receive wrong handle from UST reply on enable channel");
 206                 goto error;
 207         }
 208
 209         chan->enabled = 1;
 210         free(reply);
 211
 212         DBG2("ustctl disable channel successful for sock %d", sock);
 213         return 0;
 214
 215 error:
 216         free(reply);
 217         return -1;
 218 }