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 <config.h>
  21 #include <stdlib.h>
  22 #include <stdio.h>
  23 #include <string.h>
  24 #include <unistd.h>
  25
  26 #include <ust/lttng-ust-comm.h>
  27 #include <lttngerr.h>
  28
  29 #include "ust-comm.h"
  30 #include "ust-ctl.h"
  31
  32 /*
  33  * Send registration done packet to the application.
  34  */
  35 int ustctl_register_done(int sock)
  36 {
  37         struct lttcomm_ust_msg command;
  38         struct lttcomm_ust_reply *reply;
  39
  40         DBG("Sending register done command to %d", sock);
  41
  42         command.cmd = LTTNG_UST_REGISTER_DONE;
  43         command.handle = LTTNG_UST_ROOT_HANDLE;
  44
  45         reply = ustcomm_send_command(sock, &command);
  46         if (reply == NULL) {
  47                 goto error;
  48         }
  49
  50         if (reply->ret_code != USTCOMM_OK) {
  51                 DBG("Return code: %s", ustcomm_get_readable_code(reply->ret_code));
  52                 goto error;
  53         }
  54
  55         return 0;
  56
  57 error:
  58         return -1;
  59 }
  60
  61 /*
  62  * Create an UST session on the tracer.
  63  */
  64 int ustctl_create_session(int sock, struct ltt_ust_session *session)
  65 {
  66         struct lttcomm_ust_msg command;
  67         struct lttcomm_ust_reply *reply = NULL;
  68
  69         command.cmd = LTTNG_UST_SESSION;
  70         command.handle = LTTNG_UST_ROOT_HANDLE;
  71
  72         reply = ustcomm_send_command(sock, &command);
  73         if (reply == NULL) {
  74                 goto error;
  75         }
  76
  77         if (reply->ret_code != USTCOMM_OK) {
  78                 DBG("Return code: %s", ustcomm_get_readable_code(reply->ret_code));
  79                 goto error;
  80         }
  81
  82         /* Save session handle */
  83         session->handle = reply->ret_val;
  84         free(reply);
  85
  86         DBG2("ustctl create session command successful");
  87         return 0;
  88
  89 error:
  90         free(reply);
  91         return -1;
  92 }
  93
  94 /*
  95  * Create UST channel to the tracer.
  96  */
  97 int ustctl_create_channel(int sock, struct ltt_ust_session *session,
  98                 struct lttng_channel *channel)
  99 {
 100         struct lttcomm_ust_msg command;
 101         struct lttcomm_ust_reply *reply = NULL;
 102         struct ltt_ust_channel *uchan;
 103
 104         uchan = trace_ust_create_channel(channel, session->path);
 105         if (uchan == NULL) {
 106                 goto error;
 107         }
 108
 109         memset(&command, 0, sizeof(command));
 110
 111         command.cmd = LTTNG_UST_CHANNEL;
 112         command.handle = session->handle;
 113
 114         /* Copy channel attributes to command */
 115         memcpy(&command.u.channel, &uchan->attr, sizeof(command.u.channel));
 116
 117         reply = ustcomm_send_command(sock, &command);
 118         if (reply == NULL) {
 119                 goto error;
 120         }
 121
 122         if (reply->ret_code != USTCOMM_OK) {
 123                 DBG("Return code (%d): %s", reply->ret_code,
 124                                 ustcomm_get_readable_code(reply->ret_code));
 125                 goto error;
 126         }
 127
 128         uchan->handle = reply->ret_val;
 129
 130         /* Add channel to session */
 131         cds_list_add(&uchan->list, &session->channels.head);
 132         session->channels.count++;
 133
 134         free(reply);
 135
 136         return 0;
 137
 138 error:
 139         free(reply);
 140         return -1;
 141 }
 142
 143 /*
 144  * Enable UST channel.
 145  */
 146 int ustctl_enable_channel(int sock, struct ltt_ust_session *session,
 147                 struct ltt_ust_channel *chan)
 148 {
 149         struct lttcomm_ust_msg command;
 150         struct lttcomm_ust_reply *reply = NULL;
 151
 152         memset(&command, 0, sizeof(command));
 153
 154         command.cmd = LTTNG_UST_ENABLE;
 155         command.handle = chan->handle;
 156
 157         reply = ustcomm_send_command(sock, &command);
 158         if (reply == NULL) {
 159                 goto error;
 160         }
 161
 162         if (reply->ret_code != USTCOMM_OK) {
 163                 DBG("Return code (%d): %s", reply->ret_code,
 164                                 ustcomm_get_readable_code(reply->ret_code));
 165                 goto error;
 166         } else if (reply->handle != chan->handle) {
 167                 ERR("Receive wrong handle from UST reply on enable channel");
 168                 goto error;
 169         }
 170
 171         chan->enabled = 1;
 172         free(reply);
 173
 174         DBG2("ustctl enable channel successful for sock %d", sock);
 175         return 0;
 176
 177 error:
 178         free(reply);
 179         return -1;
 180 }
 181
 182 /*
 183  * Disable UST channel.
 184  */
 185 int ustctl_disable_channel(int sock, struct ltt_ust_session *session,
 186                 struct ltt_ust_channel *chan)
 187 {
 188         struct lttcomm_ust_msg command;
 189         struct lttcomm_ust_reply *reply = NULL;
 190
 191         memset(&command, 0, sizeof(command));
 192
 193         command.cmd = LTTNG_UST_DISABLE;
 194         command.handle = chan->handle;
 195
 196         reply = ustcomm_send_command(sock, &command);
 197         if (reply == NULL) {
 198                 goto error;
 199         }
 200
 201         if (reply->ret_code != USTCOMM_OK) {
 202                 DBG("Return code (%d): %s", reply->ret_code,
 203                                 ustcomm_get_readable_code(reply->ret_code));
 204                 goto error;
 205         } else if (reply->handle != chan->handle) {
 206                 ERR("Receive wrong handle from UST reply on enable channel");
 207                 goto error;
 208         }
 209
 210         chan->enabled = 1;
 211         free(reply);
 212
 213         DBG2("ustctl disable channel successful for sock %d", sock);
 214         return 0;
 215
 216 error:
 217         free(reply);
 218         return -1;
 219 }