src/bin/lttng/commands/disable_events.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 <popt.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <sys/stat.h>
  25 #include <sys/types.h>
  26 #include <unistd.h>
  27
  28 #include "../command.h"
  29
  30 static char *opt_event_list;
  31 static int opt_kernel;
  32 static char *opt_channel_name;
  33 static char *opt_session_name;
  34 static int opt_userspace;
  35 static int opt_disable_all;
  36 #if 0
  37 /* Not implemented yet */
  38 static char *opt_cmd_name;
  39 static pid_t opt_pid;
  40 #endif
  41
  42 enum {
  43         OPT_HELP = 1,
  44         OPT_USERSPACE,
  45         OPT_LIST_OPTIONS,
  46 };
  47
  48 static struct lttng_handle *handle;
  49
  50 static struct poptOption long_options[] = {
  51         /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
  52         {"help",           'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
  53         {"session",        's', POPT_ARG_STRING, &opt_session_name, 0, 0, 0},
  54         {"all-events",     'a', POPT_ARG_VAL, &opt_disable_all, 1, 0, 0},
  55         {"channel",        'c', POPT_ARG_STRING, &opt_channel_name, 0, 0, 0},
  56         {"kernel",         'k', POPT_ARG_VAL, &opt_kernel, 1, 0, 0},
  57 #if 0
  58         /* Not implemented yet */
  59         {"userspace",      'u', POPT_ARG_STRING | POPT_ARGFLAG_OPTIONAL, &opt_cmd_name, OPT_USERSPACE, 0, 0},
  60         {"pid",            'p', POPT_ARG_INT, &opt_pid, 0, 0, 0},
  61 #else
  62         {"userspace",      'u', POPT_ARG_NONE, 0, OPT_USERSPACE, 0, 0},
  63 #endif
  64         {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
  65         {0, 0, 0, 0, 0, 0, 0}
  66 };
  67
  68 /*
  69  * usage
  70  */
  71 static void usage(FILE *ofp)
  72 {
  73         fprintf(ofp, "usage: lttng disable-event NAME[,NAME2,...] [options]\n");
  74         fprintf(ofp, "\n");
  75         fprintf(ofp, "  -h, --help               Show this help\n");
  76         fprintf(ofp, "      --list-options       Simple listing of options\n");
  77         fprintf(ofp, "  -s, --session            Apply to session name\n");
  78         fprintf(ofp, "  -c, --channel            Apply to this channel\n");
  79         fprintf(ofp, "  -a, --all-events         Disable all tracepoints\n");
  80         fprintf(ofp, "  -k, --kernel             Apply for the kernel tracer\n");
  81 #if 0
  82         fprintf(ofp, "  -u, --userspace [CMD]    Apply to the user-space tracer\n");
  83         fprintf(ofp, "                           If no CMD, the domain used is UST global\n");
  84         fprintf(ofp, "                           or else the domain is UST EXEC_NAME\n");
  85         fprintf(ofp, "  -p, --pid PID            If -u, apply to specific PID (domain: UST PID)\n");
  86 #else
  87         fprintf(ofp, "  -u, --userspace          Apply to the user-space tracer\n");
  88 #endif
  89         fprintf(ofp, "\n");
  90 }
  91
  92 /*
  93  *  disable_events
  94  *
  95  *  Disabling event using the lttng API.
  96  */
  97 static int disable_events(char *session_name)
  98 {
  99         int err, ret = CMD_SUCCESS, warn = 0;
 100         char *event_name, *channel_name = NULL;
 101         struct lttng_domain dom;
 102
 103         /* Create lttng domain */
 104         if (opt_kernel) {
 105                 dom.type = LTTNG_DOMAIN_KERNEL;
 106         } else if (opt_userspace) {
 107                 dom.type = LTTNG_DOMAIN_UST;
 108         } else {
 109                 ERR("Please specify a tracer (-k/--kernel or -u/--userspace)");
 110                 ret = CMD_ERROR;
 111                 goto error;
 112         }
 113
 114         /* Get channel name */
 115         if (opt_channel_name == NULL) {
 116                 err = asprintf(&channel_name, DEFAULT_CHANNEL_NAME);
 117                 if (err < 0) {
 118                         ret = CMD_FATAL;
 119                         goto error;
 120                 }
 121         } else {
 122                 channel_name = opt_channel_name;
 123         }
 124
 125         handle = lttng_create_handle(session_name, &dom);
 126         if (handle == NULL) {
 127                 ret = -1;
 128                 goto error;
 129         }
 130
 131         if (opt_disable_all) {
 132                 ret = lttng_disable_event(handle, NULL, channel_name);
 133                 if (ret < 0) {
 134                         /* Don't set ret so lttng can interpret the sessiond error. */
 135                         goto error;
 136                 }
 137
 138                 MSG("All %s events are disabled in channel %s",
 139                                 opt_kernel ? "kernel" : "UST", channel_name);
 140                 goto end;
 141         }
 142
 143         /* Strip event list */
 144         event_name = strtok(opt_event_list, ",");
 145         while (event_name != NULL) {
 146                 DBG("Disabling event %s", event_name);
 147
 148                 ret = lttng_disable_event(handle, event_name, channel_name);
 149                 if (ret < 0) {
 150                         ERR("Event %s: %s (channel %s, session %s)", event_name,
 151                                         lttng_strerror(ret), channel_name, session_name);
 152                         warn = 1;
 153                 } else {
 154                         MSG("%s event %s disabled in channel %s for session %s",
 155                                         opt_kernel ? "kernel" : "UST", event_name, channel_name,
 156                                         session_name);
 157                 }
 158
 159                 /* Next event */
 160                 event_name = strtok(NULL, ",");
 161         }
 162
 163         ret = CMD_SUCCESS;
 164
 165 end:
 166 error:
 167         if (warn) {
 168                 ret = CMD_WARNING;
 169         }
 170         if (opt_channel_name == NULL) {
 171                 free(channel_name);
 172         }
 173         lttng_destroy_handle(handle);
 174
 175         return ret;
 176 }
 177
 178 /*
 179  *  cmd_disable_events
 180  *
 181  *  Disable event to trace session
 182  */
 183 int cmd_disable_events(int argc, const char **argv)
 184 {
 185         int opt, ret = CMD_SUCCESS;
 186         static poptContext pc;
 187         char *session_name = NULL;
 188
 189         pc = poptGetContext(NULL, argc, argv, long_options, 0);
 190         poptReadDefaultConfig(pc, 0);
 191
 192         while ((opt = poptGetNextOpt(pc)) != -1) {
 193                 switch (opt) {
 194                 case OPT_HELP:
 195                         usage(stdout);
 196                         goto end;
 197                 case OPT_USERSPACE:
 198                         opt_userspace = 1;
 199                         break;
 200                 case OPT_LIST_OPTIONS:
 201                         list_cmd_options(stdout, long_options);
 202                         goto end;
 203                 default:
 204                         usage(stderr);
 205                         ret = CMD_UNDEFINED;
 206                         goto end;
 207                 }
 208         }
 209
 210         opt_event_list = (char*) poptGetArg(pc);
 211         if (opt_event_list == NULL && opt_disable_all == 0) {
 212                 ERR("Missing event name(s).\n");
 213                 usage(stderr);
 214                 ret = CMD_ERROR;
 215                 goto end;
 216         }
 217
 218         if (!opt_session_name) {
 219                 session_name = get_session_name();
 220                 if (session_name == NULL) {
 221                         ret = CMD_ERROR;
 222                         goto end;
 223                 }
 224         } else {
 225                 session_name = opt_session_name;
 226         }
 227
 228         ret = disable_events(session_name);
 229
 230 end:
 231         if (!opt_session_name && session_name) {
 232                 free(session_name);
 233         }
 234         poptFreeContext(pc);
 235         return ret;
 236 }