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         memset(&dom, 0, sizeof(dom));
 104
 105         /* Create lttng domain */
 106         if (opt_kernel) {
 107                 dom.type = LTTNG_DOMAIN_KERNEL;
 108         } else if (opt_userspace) {
 109                 dom.type = LTTNG_DOMAIN_UST;
 110         } else {
 111                 ERR("Please specify a tracer (-k/--kernel or -u/--userspace)");
 112                 ret = CMD_ERROR;
 113                 goto error;
 114         }
 115
 116         /* Get channel name */
 117         if (opt_channel_name == NULL) {
 118                 err = asprintf(&channel_name, DEFAULT_CHANNEL_NAME);
 119                 if (err < 0) {
 120                         ret = CMD_FATAL;
 121                         goto error;
 122                 }
 123         } else {
 124                 channel_name = opt_channel_name;
 125         }
 126
 127         handle = lttng_create_handle(session_name, &dom);
 128         if (handle == NULL) {
 129                 ret = -1;
 130                 goto error;
 131         }
 132
 133         if (opt_disable_all) {
 134                 ret = lttng_disable_event(handle, NULL, channel_name);
 135                 if (ret < 0) {
 136                         /* Don't set ret so lttng can interpret the sessiond error. */
 137                         goto error;
 138                 }
 139
 140                 MSG("All %s events are disabled in channel %s",
 141                                 opt_kernel ? "kernel" : "UST", channel_name);
 142                 goto end;
 143         }
 144
 145         /* Strip event list */
 146         event_name = strtok(opt_event_list, ",");
 147         while (event_name != NULL) {
 148                 DBG("Disabling event %s", event_name);
 149
 150                 ret = lttng_disable_event(handle, event_name, channel_name);
 151                 if (ret < 0) {
 152                         ERR("Event %s: %s (channel %s, session %s)", event_name,
 153                                         lttng_strerror(ret), channel_name, session_name);
 154                         warn = 1;
 155                 } else {
 156                         MSG("%s event %s disabled in channel %s for session %s",
 157                                         opt_kernel ? "kernel" : "UST", event_name, channel_name,
 158                                         session_name);
 159                 }
 160
 161                 /* Next event */
 162                 event_name = strtok(NULL, ",");
 163         }
 164
 165         ret = CMD_SUCCESS;
 166
 167 end:
 168 error:
 169         if (warn) {
 170                 ret = CMD_WARNING;
 171         }
 172         if (opt_channel_name == NULL) {
 173                 free(channel_name);
 174         }
 175         lttng_destroy_handle(handle);
 176
 177         return ret;
 178 }
 179
 180 /*
 181  *  cmd_disable_events
 182  *
 183  *  Disable event to trace session
 184  */
 185 int cmd_disable_events(int argc, const char **argv)
 186 {
 187         int opt, ret = CMD_SUCCESS;
 188         static poptContext pc;
 189         char *session_name = NULL;
 190
 191         pc = poptGetContext(NULL, argc, argv, long_options, 0);
 192         poptReadDefaultConfig(pc, 0);
 193
 194         while ((opt = poptGetNextOpt(pc)) != -1) {
 195                 switch (opt) {
 196                 case OPT_HELP:
 197                         usage(stdout);
 198                         goto end;
 199                 case OPT_USERSPACE:
 200                         opt_userspace = 1;
 201                         break;
 202                 case OPT_LIST_OPTIONS:
 203                         list_cmd_options(stdout, long_options);
 204                         goto end;
 205                 default:
 206                         usage(stderr);
 207                         ret = CMD_UNDEFINED;
 208                         goto end;
 209                 }
 210         }
 211
 212         opt_event_list = (char*) poptGetArg(pc);
 213         if (opt_event_list == NULL && opt_disable_all == 0) {
 214                 ERR("Missing event name(s).\n");
 215                 usage(stderr);
 216                 ret = CMD_ERROR;
 217                 goto end;
 218         }
 219
 220         if (!opt_session_name) {
 221                 session_name = get_session_name();
 222                 if (session_name == NULL) {
 223                         ret = CMD_ERROR;
 224                         goto end;
 225                 }
 226         } else {
 227                 session_name = opt_session_name;
 228         }
 229
 230         ret = disable_events(session_name);
 231
 232 end:
 233         if (!opt_session_name && session_name) {
 234                 free(session_name);
 235         }
 236         poptFreeContext(pc);
 237         return ret;
 238 }