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 on session name\n");
  78         fprintf(ofp, "  -c, --channel            Apply on 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 for 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 for 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;
 100         char *event_name, *channel_name = NULL;
 101         struct lttng_domain dom;
 102
 103         if (opt_channel_name == NULL) {
 104                 err = asprintf(&channel_name, DEFAULT_CHANNEL_NAME);
 105                 if (err < 0) {
 106                         ret = CMD_FATAL;
 107                         goto error;
 108                 }
 109         } else {
 110                 channel_name = opt_channel_name;
 111         }
 112
 113         if (opt_kernel && opt_userspace) {
 114                 ERR("Can't use -k/--kernel and -u/--userspace together");
 115                 ret = CMD_FATAL;
 116                 goto error;
 117         }
 118
 119         /* Create lttng domain */
 120         if (opt_kernel) {
 121                 dom.type = LTTNG_DOMAIN_KERNEL;
 122         } else if (opt_userspace) {
 123                 dom.type = LTTNG_DOMAIN_UST;
 124         } else {
 125                 ERR("Please specify a tracer (-k/--kernel or -u/--userspace)");
 126                 ret = CMD_UNDEFINED;
 127                 goto error;
 128         }
 129
 130         handle = lttng_create_handle(session_name, &dom);
 131         if (handle == NULL) {
 132                 ret = -1;
 133                 goto error;
 134         }
 135
 136         if (opt_disable_all) {
 137                 ret = lttng_disable_event(handle, NULL, channel_name);
 138                 if (ret < 0) {
 139                         goto error;
 140                 }
 141
 142                 MSG("All %s events are disabled in channel %s",
 143                                 opt_kernel ? "kernel" : "UST", channel_name);
 144                 goto end;
 145         }
 146
 147         /* Strip event list */
 148         event_name = strtok(opt_event_list, ",");
 149         while (event_name != NULL) {
 150                 /* Kernel tracer action */
 151                 if (opt_kernel) {
 152                         DBG("Disabling kernel event %s in channel %s",
 153                                         event_name, channel_name);
 154                 } else if (opt_userspace) {             /* User-space tracer action */
 155 #if 0
 156                         if (opt_cmd_name != NULL || opt_pid) {
 157                                 MSG("Only supporting tracing all UST processes (-u) for now.");
 158                                 ret = CMD_UNDEFINED;
 159                                 goto error;
 160                         }
 161 #endif
 162                         DBG("Disabling UST event %s in channel %s",
 163                                         event_name, channel_name);
 164                 } else {
 165                         ERR("Please specify a tracer (-k/--kernel or -u/--userspace)");
 166                         goto error;
 167                 }
 168
 169                 ret = lttng_disable_event(handle, event_name, channel_name);
 170                 if (ret < 0) {
 171                         MSG("Unable to disable %s event %s in channel %s",
 172                                         opt_kernel ? "kernel" : "UST", event_name,
 173                                         channel_name);
 174                 } else {
 175                         MSG("%s event %s disabled in channel %s",
 176                                         opt_kernel ? "kernel" : "UST", event_name,
 177                                         channel_name);
 178                 }
 179
 180                 /* Next event */
 181                 event_name = strtok(NULL, ",");
 182         }
 183
 184 end:
 185 error:
 186         if (opt_channel_name == NULL) {
 187                 free(channel_name);
 188         }
 189         lttng_destroy_handle(handle);
 190
 191         return ret;
 192 }
 193
 194 /*
 195  *  cmd_disable_events
 196  *
 197  *  Disable event to trace session
 198  */
 199 int cmd_disable_events(int argc, const char **argv)
 200 {
 201         int opt, ret;
 202         static poptContext pc;
 203         char *session_name = NULL;
 204
 205         pc = poptGetContext(NULL, argc, argv, long_options, 0);
 206         poptReadDefaultConfig(pc, 0);
 207
 208         while ((opt = poptGetNextOpt(pc)) != -1) {
 209                 switch (opt) {
 210                 case OPT_HELP:
 211                         usage(stderr);
 212                         ret = CMD_SUCCESS;
 213                         goto end;
 214                 case OPT_USERSPACE:
 215                         opt_userspace = 1;
 216                         break;
 217                 case OPT_LIST_OPTIONS:
 218                         list_cmd_options(stdout, long_options);
 219                         ret = CMD_SUCCESS;
 220                         goto end;
 221                 default:
 222                         usage(stderr);
 223                         ret = CMD_UNDEFINED;
 224                         goto end;
 225                 }
 226         }
 227
 228         opt_event_list = (char*) poptGetArg(pc);
 229         if (opt_event_list == NULL && opt_disable_all == 0) {
 230                 ERR("Missing event name(s).\n");
 231                 usage(stderr);
 232                 ret = CMD_SUCCESS;
 233                 goto end;
 234         }
 235
 236         if (!opt_session_name) {
 237                 session_name = get_session_name();
 238                 if (session_name == NULL) {
 239                         ret = -1;
 240                         goto end;
 241                 }
 242         } else {
 243                 session_name = opt_session_name;
 244         }
 245
 246         ret = disable_events(session_name);
 247
 248 end:
 249         return ret;
 250 }