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 "../cmd.h"
  29 #include "../conf.h"
  30 #include "../utils.h"
  31
  32 static char *opt_event_list;
  33 static char *opt_kernel;
  34 static char *opt_cmd_name;
  35 static char *opt_channel_name;
  36 static char *opt_session_name;
  37 static int opt_pid_all;
  38 static int opt_userspace;
  39 static int opt_disable_all;
  40 static pid_t opt_pid;
  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         {"userspace",      'u', POPT_ARG_STRING | POPT_ARGFLAG_OPTIONAL, 0, OPT_USERSPACE, 0, 0},
  57         {"all",            0,   POPT_ARG_VAL, &opt_pid_all, 1, 0, 0},
  58         {"pid",            'p', POPT_ARG_INT, &opt_pid, 0, 0, 0},
  59         {0, 0, 0, 0, 0, 0, 0}
  60 };
  61
  62 /*
  63  * usage
  64  */
  65 static void usage(FILE *ofp)
  66 {
  67         fprintf(ofp, "usage: lttng disable-event NAME[,NAME2,...] [options]\n");
  68         fprintf(ofp, "\n");
  69         fprintf(ofp, "  -h, --help               Show this help\n");
  70         fprintf(ofp, "  -s, --session            Apply on session name\n");
  71         fprintf(ofp, "  -c, --channel            Apply on this channel\n");
  72         fprintf(ofp, "  -a, --all-events         Enable all tracepoints\n");
  73         fprintf(ofp, "  -k, --kernel             Apply for the kernel tracer\n");
  74         fprintf(ofp, "  -u, --userspace [CMD]    Apply for the user-space tracer\n");
  75         fprintf(ofp, "      --all                If -u, apply on all traceable apps\n");
  76         fprintf(ofp, "  -p, --pid PID            If -u, apply on a specific PID\n");
  77         fprintf(ofp, "\n");
  78 }
  79
  80 /*
  81  *  disable_events
  82  *
  83  *  Disabling event using the lttng API.
  84  */
  85 static int disable_events(char *session_name)
  86 {
  87         int err, ret = CMD_SUCCESS;
  88         char *event_name, *channel_name = NULL;
  89         struct lttng_event ev;
  90         struct lttng_domain dom;
  91
  92         if (opt_channel_name == NULL) {
  93                 err = asprintf(&channel_name, DEFAULT_CHANNEL_NAME);
  94                 if (err < 0) {
  95                         ret = CMD_FATAL;
  96                         goto error;
  97                 }
  98         } else {
  99                 channel_name = opt_channel_name;
 100         }
 101
 102         if (opt_kernel) {
 103                 dom.type = LTTNG_DOMAIN_KERNEL;
 104         }
 105
 106         handle = lttng_create_handle(session_name, &dom);
 107         if (handle == NULL) {
 108                 ret = -1;
 109                 goto error;
 110         }
 111
 112         if (opt_disable_all) {
 113                 if (opt_kernel) {
 114                         ret = lttng_disable_event(handle, NULL, channel_name);
 115                         goto error;
 116                 }
 117
 118                 /* TODO: User-space tracer */
 119         }
 120
 121         /* Strip event list */
 122         event_name = strtok(opt_event_list, ",");
 123         while (event_name != NULL) {
 124                 /* Kernel tracer action */
 125                 if (opt_kernel) {
 126                         DBG("Disabling kernel event %s for channel %s",
 127                                         event_name, channel_name);
 128
 129                         /* Copy name and type of the event */
 130                         strncpy(ev.name, event_name, LTTNG_SYMBOL_NAME_LEN);
 131                         ev.name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
 132                         ret = lttng_disable_event(handle, event_name, channel_name);
 133                         if (ret < 0) {
 134                                 MSG("Unable to disable event %s for channel %s",
 135                                                 event_name, channel_name);
 136                         } else {
 137                                 MSG("Kernel event %s disabled for channel %s",
 138                                                 event_name, channel_name);
 139                         }
 140                 } else if (opt_userspace) {             /* User-space tracer action */
 141                         /*
 142                          * TODO: Waiting on lttng UST 2.0
 143                          */
 144                         if (opt_pid_all) {
 145                         } else if (opt_pid != 0) {
 146                         }
 147                         ret = CMD_NOT_IMPLEMENTED;
 148                         goto error;
 149                 } else {
 150                         ERR("Please specify a tracer (--kernel or --userspace)");
 151                         goto error;
 152                 }
 153
 154                 /* Next event */
 155                 event_name = strtok(NULL, ",");
 156         }
 157
 158 error:
 159         if (opt_channel_name == NULL) {
 160                 free(channel_name);
 161         }
 162         lttng_destroy_handle(handle);
 163
 164         return ret;
 165 }
 166
 167 /*
 168  *  cmd_disable_events
 169  *
 170  *  Disable event to trace session
 171  */
 172 int cmd_disable_events(int argc, const char **argv)
 173 {
 174         int opt, ret;
 175         static poptContext pc;
 176         char *session_name = NULL;
 177
 178         pc = poptGetContext(NULL, argc, argv, long_options, 0);
 179         poptReadDefaultConfig(pc, 0);
 180
 181         while ((opt = poptGetNextOpt(pc)) != -1) {
 182                 switch (opt) {
 183                 case OPT_HELP:
 184                         usage(stderr);
 185                         ret = CMD_SUCCESS;
 186                         goto end;
 187                 case OPT_USERSPACE:
 188                         opt_userspace = 1;
 189                         opt_cmd_name = poptGetOptArg(pc);
 190                         break;
 191                 default:
 192                         usage(stderr);
 193                         ret = CMD_UNDEFINED;
 194                         goto end;
 195                 }
 196         }
 197
 198         opt_event_list = (char*) poptGetArg(pc);
 199         if (opt_event_list == NULL && opt_disable_all == 0) {
 200                 ERR("Missing event name(s).\n");
 201                 usage(stderr);
 202                 ret = CMD_SUCCESS;
 203                 goto end;
 204         }
 205
 206         if (!opt_session_name) {
 207                 session_name = get_session_name();
 208                 if (session_name == NULL) {
 209                         ret = -1;
 210                         goto end;
 211                 }
 212         } else {
 213                 session_name = opt_session_name;
 214         }
 215
 216         ret = disable_events(session_name);
 217
 218 end:
 219         return ret;
 220 }