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 };
  46
  47 static struct lttng_handle *handle;
  48
  49 static struct poptOption long_options[] = {
  50         /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
  51         {"help",           'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
  52         {"session",        's', POPT_ARG_STRING, &opt_session_name, 0, 0, 0},
  53         {"all-events",     'a', POPT_ARG_VAL, &opt_disable_all, 1, 0, 0},
  54         {"channel",        'c', POPT_ARG_STRING, &opt_channel_name, 0, 0, 0},
  55         {"kernel",         'k', POPT_ARG_VAL, &opt_kernel, 1, 0, 0},
  56 #if 0
  57         /* Not implemented yet */
  58         {"userspace",      'u', POPT_ARG_STRING | POPT_ARGFLAG_OPTIONAL, &opt_cmd_name, OPT_USERSPACE, 0, 0},
  59         {"pid",            'p', POPT_ARG_INT, &opt_pid, 0, 0, 0},
  60 #else
  61         {"userspace",      'u', POPT_ARG_NONE, 0, OPT_USERSPACE, 0, 0},
  62 #endif
  63         {0, 0, 0, 0, 0, 0, 0}
  64 };
  65
  66 /*
  67  * usage
  68  */
  69 static void usage(FILE *ofp)
  70 {
  71         fprintf(ofp, "usage: lttng disable-event NAME[,NAME2,...] [options]\n");
  72         fprintf(ofp, "\n");
  73         fprintf(ofp, "  -h, --help               Show this help\n");
  74         fprintf(ofp, "  -s, --session            Apply on session name\n");
  75         fprintf(ofp, "  -c, --channel            Apply on this channel\n");
  76         fprintf(ofp, "  -a, --all-events         Disable all tracepoints\n");
  77         fprintf(ofp, "  -k, --kernel             Apply for the kernel tracer\n");
  78 #if 0
  79         fprintf(ofp, "  -u, --userspace [CMD]    Apply for the user-space tracer\n");
  80         fprintf(ofp, "                           If no CMD, the domain used is UST global\n");
  81         fprintf(ofp, "                           or else the domain is UST EXEC_NAME\n");
  82         fprintf(ofp, "  -p, --pid PID            If -u, apply to specific PID (domain: UST PID)\n");
  83 #else
  84         fprintf(ofp, "  -u, --userspace          Apply for the user-space tracer\n");
  85 #endif
  86         fprintf(ofp, "\n");
  87 }
  88
  89 /*
  90  *  disable_events
  91  *
  92  *  Disabling event using the lttng API.
  93  */
  94 static int disable_events(char *session_name)
  95 {
  96         int err, ret = CMD_SUCCESS;
  97         char *event_name, *channel_name = NULL;
  98         struct lttng_domain dom;
  99
 100         if (opt_channel_name == NULL) {
 101                 err = asprintf(&channel_name, DEFAULT_CHANNEL_NAME);
 102                 if (err < 0) {
 103                         ret = CMD_FATAL;
 104                         goto error;
 105                 }
 106         } else {
 107                 channel_name = opt_channel_name;
 108         }
 109
 110         if (opt_kernel && opt_userspace) {
 111                 ERR("Can't use -k/--kernel and -u/--userspace together");
 112                 ret = CMD_FATAL;
 113                 goto error;
 114         }
 115
 116         /* Create lttng domain */
 117         if (opt_kernel) {
 118                 dom.type = LTTNG_DOMAIN_KERNEL;
 119         } else if (opt_userspace) {
 120                 dom.type = LTTNG_DOMAIN_UST;
 121         } else {
 122                 ERR("Please specify a tracer (-k/--kernel or -u/--userspace)");
 123                 ret = CMD_NOT_IMPLEMENTED;
 124                 goto error;
 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                         goto error;
 137                 }
 138
 139                 MSG("All %s events are disabled in channel %s",
 140                                 opt_kernel ? "kernel" : "UST", channel_name);
 141                 goto end;
 142         }
 143
 144         /* Strip event list */
 145         event_name = strtok(opt_event_list, ",");
 146         while (event_name != NULL) {
 147                 /* Kernel tracer action */
 148                 if (opt_kernel) {
 149                         DBG("Disabling kernel event %s in channel %s",
 150                                         event_name, channel_name);
 151                 } else if (opt_userspace) {             /* User-space tracer action */
 152 #if 0
 153                         if (opt_cmd_name != NULL || opt_pid) {
 154                                 MSG("Only supporting tracing all UST processes (-u) for now.");
 155                                 ret = CMD_NOT_IMPLEMENTED;
 156                                 goto error;
 157                         }
 158 #endif
 159                         DBG("Disabling UST event %s in channel %s",
 160                                         event_name, channel_name);
 161                 } else {
 162                         ERR("Please specify a tracer (-k/--kernel or -u/--userspace)");
 163                         goto error;
 164                 }
 165
 166                 ret = lttng_disable_event(handle, event_name, channel_name);
 167                 if (ret < 0) {
 168                         MSG("Unable to disable %s event %s in channel %s",
 169                                         opt_kernel ? "kernel" : "UST", event_name,
 170                                         channel_name);
 171                 } else {
 172                         MSG("%s event %s disabled in channel %s",
 173                                         opt_kernel ? "kernel" : "UST", event_name,
 174                                         channel_name);
 175                 }
 176
 177                 /* Next event */
 178                 event_name = strtok(NULL, ",");
 179         }
 180
 181 end:
 182 error:
 183         if (opt_channel_name == NULL) {
 184                 free(channel_name);
 185         }
 186         lttng_destroy_handle(handle);
 187
 188         return ret;
 189 }
 190
 191 /*
 192  *  cmd_disable_events
 193  *
 194  *  Disable event to trace session
 195  */
 196 int cmd_disable_events(int argc, const char **argv)
 197 {
 198         int opt, ret;
 199         static poptContext pc;
 200         char *session_name = NULL;
 201
 202         pc = poptGetContext(NULL, argc, argv, long_options, 0);
 203         poptReadDefaultConfig(pc, 0);
 204
 205         while ((opt = poptGetNextOpt(pc)) != -1) {
 206                 switch (opt) {
 207                 case OPT_HELP:
 208                         usage(stderr);
 209                         ret = CMD_SUCCESS;
 210                         goto end;
 211                 case OPT_USERSPACE:
 212                         opt_userspace = 1;
 213                         break;
 214                 default:
 215                         usage(stderr);
 216                         ret = CMD_UNDEFINED;
 217                         goto end;
 218                 }
 219         }
 220
 221         opt_event_list = (char*) poptGetArg(pc);
 222         if (opt_event_list == NULL && opt_disable_all == 0) {
 223                 ERR("Missing event name(s).\n");
 224                 usage(stderr);
 225                 ret = CMD_SUCCESS;
 226                 goto end;
 227         }
 228
 229         if (!opt_session_name) {
 230                 session_name = get_session_name();
 231                 if (session_name == NULL) {
 232                         ret = -1;
 233                         goto end;
 234                 }
 235         } else {
 236                 session_name = opt_session_name;
 237         }
 238
 239         ret = disable_events(session_name);
 240
 241 end:
 242         return ret;
 243 }