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 modify
   5  * it under the terms of the GNU General Public License, version 2 only,
   6  * as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along
  14  * with this program; if not, write to the Free Software Foundation, Inc.,
  15  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  16  */
  17
  18 #define _GNU_SOURCE
  19 #include <popt.h>
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include <sys/stat.h>
  24 #include <sys/types.h>
  25 #include <unistd.h>
  26
  27 #include "../command.h"
  28
  29 static char *opt_event_list;
  30 static int opt_kernel;
  31 static char *opt_channel_name;
  32 static char *opt_session_name;
  33 static int opt_userspace;
  34 static int opt_disable_all;
  35 #if 0
  36 /* Not implemented yet */
  37 static char *opt_cmd_name;
  38 static pid_t opt_pid;
  39 #endif
  40
  41 enum {
  42         OPT_HELP = 1,
  43         OPT_USERSPACE,
  44         OPT_LIST_OPTIONS,
  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         {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
  64         {0, 0, 0, 0, 0, 0, 0}
  65 };
  66
  67 /*
  68  * usage
  69  */
  70 static void usage(FILE *ofp)
  71 {
  72         fprintf(ofp, "usage: lttng disable-event NAME[,NAME2,...] (-k | -u) [OPTIONS]\n");
  73         fprintf(ofp, "\n");
  74         fprintf(ofp, "Options:\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 NAME       Apply to session name\n");
  78         fprintf(ofp, "  -c, --channel NAME       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         fprintf(ofp, "  -u, --userspace          Apply to the user-space tracer\n");
  82         fprintf(ofp, "\n");
  83 }
  84
  85 /*
  86  *  disable_events
  87  *
  88  *  Disabling event using the lttng API.
  89  */
  90 static int disable_events(char *session_name)
  91 {
  92         int err, ret = CMD_SUCCESS, warn = 0;
  93         char *event_name, *channel_name = NULL;
  94         struct lttng_domain dom;
  95
  96         memset(&dom, 0, sizeof(dom));
  97
  98         /* Create lttng domain */
  99         if (opt_kernel) {
 100                 dom.type = LTTNG_DOMAIN_KERNEL;
 101         } else if (opt_userspace) {
 102                 dom.type = LTTNG_DOMAIN_UST;
 103         } else {
 104                 ERR("Please specify a tracer (-k/--kernel or -u/--userspace)");
 105                 ret = CMD_ERROR;
 106                 goto error;
 107         }
 108
 109         /* Get channel name */
 110         if (opt_channel_name == NULL) {
 111                 err = asprintf(&channel_name, DEFAULT_CHANNEL_NAME);
 112                 if (err < 0) {
 113                         ret = CMD_FATAL;
 114                         goto error;
 115                 }
 116         } else {
 117                 channel_name = opt_channel_name;
 118         }
 119
 120         handle = lttng_create_handle(session_name, &dom);
 121         if (handle == NULL) {
 122                 ret = -1;
 123                 goto error;
 124         }
 125
 126         if (opt_disable_all) {
 127                 ret = lttng_disable_event(handle, NULL, channel_name);
 128                 if (ret < 0) {
 129                         ERR("%s", lttng_strerror(ret));
 130                         goto error;
 131                 }
 132
 133                 MSG("All %s events are disabled in channel %s",
 134                                 opt_kernel ? "kernel" : "UST", channel_name);
 135                 goto end;
 136         }
 137
 138         /* Strip event list */
 139         event_name = strtok(opt_event_list, ",");
 140         while (event_name != NULL) {
 141                 DBG("Disabling event %s", event_name);
 142
 143                 ret = lttng_disable_event(handle, event_name, channel_name);
 144                 if (ret < 0) {
 145                         ERR("Event %s: %s (channel %s, session %s)", event_name,
 146                                         lttng_strerror(ret), channel_name, session_name);
 147                         warn = 1;
 148                 } else {
 149                         MSG("%s event %s disabled in channel %s for session %s",
 150                                         opt_kernel ? "kernel" : "UST", event_name, channel_name,
 151                                         session_name);
 152                 }
 153
 154                 /* Next event */
 155                 event_name = strtok(NULL, ",");
 156         }
 157
 158         ret = CMD_SUCCESS;
 159
 160 end:
 161 error:
 162         if (warn) {
 163                 ret = CMD_WARNING;
 164         }
 165         if (opt_channel_name == NULL) {
 166                 free(channel_name);
 167         }
 168         lttng_destroy_handle(handle);
 169
 170         return ret;
 171 }
 172
 173 /*
 174  *  cmd_disable_events
 175  *
 176  *  Disable event to trace session
 177  */
 178 int cmd_disable_events(int argc, const char **argv)
 179 {
 180         int opt, ret = CMD_SUCCESS;
 181         static poptContext pc;
 182         char *session_name = NULL;
 183
 184         pc = poptGetContext(NULL, argc, argv, long_options, 0);
 185         poptReadDefaultConfig(pc, 0);
 186
 187         while ((opt = poptGetNextOpt(pc)) != -1) {
 188                 switch (opt) {
 189                 case OPT_HELP:
 190                         usage(stdout);
 191                         goto end;
 192                 case OPT_USERSPACE:
 193                         opt_userspace = 1;
 194                         break;
 195                 case OPT_LIST_OPTIONS:
 196                         list_cmd_options(stdout, long_options);
 197                         goto end;
 198                 default:
 199                         usage(stderr);
 200                         ret = CMD_UNDEFINED;
 201                         goto end;
 202                 }
 203         }
 204
 205         opt_event_list = (char*) poptGetArg(pc);
 206         if (opt_event_list == NULL && opt_disable_all == 0) {
 207                 ERR("Missing event name(s).\n");
 208                 usage(stderr);
 209                 ret = CMD_ERROR;
 210                 goto end;
 211         }
 212
 213         if (!opt_session_name) {
 214                 session_name = get_session_name();
 215                 if (session_name == NULL) {
 216                         ret = CMD_ERROR;
 217                         goto end;
 218                 }
 219         } else {
 220                 session_name = opt_session_name;
 221         }
 222
 223         ret = disable_events(session_name);
 224
 225 end:
 226         if (!opt_session_name && session_name) {
 227                 free(session_name);
 228         }
 229         poptFreeContext(pc);
 230         return ret;
 231 }