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_channel_name;
  35 static char *opt_session_name;
  36 static int opt_pid_all;
  37 static int opt_userspace;
  38 static char *opt_cmd_name;
  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, &opt_cmd_name, 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_domain dom;
  90
  91         if (opt_channel_name == NULL) {
  92                 err = asprintf(&channel_name, DEFAULT_CHANNEL_NAME);
  93                 if (err < 0) {
  94                         ret = CMD_FATAL;
  95                         goto error;
  96                 }
  97         } else {
  98                 channel_name = opt_channel_name;
  99         }
 100
 101         if (opt_kernel) {
 102                 dom.type = LTTNG_DOMAIN_KERNEL;
 103         }
 104
 105         handle = lttng_create_handle(session_name, &dom);
 106         if (handle == NULL) {
 107                 ret = -1;
 108                 goto error;
 109         }
 110
 111         if (opt_disable_all) {
 112                 if (opt_kernel) {
 113                         ret = lttng_disable_event(handle, NULL, channel_name);
 114                         goto error;
 115                 }
 116
 117                 /* TODO: User-space tracer */
 118         }
 119
 120         /* Strip event list */
 121         event_name = strtok(opt_event_list, ",");
 122         while (event_name != NULL) {
 123                 /* Kernel tracer action */
 124                 if (opt_kernel) {
 125                         DBG("Disabling kernel event %s for channel %s",
 126                                         event_name, channel_name);
 127
 128                         ret = lttng_disable_event(handle, event_name, channel_name);
 129                         if (ret < 0) {
 130                                 MSG("Unable to disable event %s for channel %s",
 131                                                 event_name, channel_name);
 132                         } else {
 133                                 MSG("Kernel event %s disabled for channel %s",
 134                                                 event_name, channel_name);
 135                         }
 136                 } else if (opt_userspace) {             /* User-space tracer action */
 137                         /*
 138                          * TODO: Waiting on lttng UST 2.0
 139                          */
 140                         if (opt_pid_all) {
 141                         } else if (opt_pid != 0) {
 142                         }
 143                         ret = CMD_NOT_IMPLEMENTED;
 144                         goto error;
 145                 } else {
 146                         ERR("Please specify a tracer (--kernel or --userspace)");
 147                         goto error;
 148                 }
 149
 150                 /* Next event */
 151                 event_name = strtok(NULL, ",");
 152         }
 153
 154 error:
 155         if (opt_channel_name == NULL) {
 156                 free(channel_name);
 157         }
 158         lttng_destroy_handle(handle);
 159
 160         return ret;
 161 }
 162
 163 /*
 164  *  cmd_disable_events
 165  *
 166  *  Disable event to trace session
 167  */
 168 int cmd_disable_events(int argc, const char **argv)
 169 {
 170         int opt, ret;
 171         static poptContext pc;
 172         char *session_name = NULL;
 173
 174         pc = poptGetContext(NULL, argc, argv, long_options, 0);
 175         poptReadDefaultConfig(pc, 0);
 176
 177         while ((opt = poptGetNextOpt(pc)) != -1) {
 178                 switch (opt) {
 179                 case OPT_HELP:
 180                         usage(stderr);
 181                         ret = CMD_SUCCESS;
 182                         goto end;
 183                 case OPT_USERSPACE:
 184                         opt_userspace = 1;
 185                         break;
 186                 default:
 187                         usage(stderr);
 188                         ret = CMD_UNDEFINED;
 189                         goto end;
 190                 }
 191         }
 192
 193         opt_event_list = (char*) poptGetArg(pc);
 194         if (opt_event_list == NULL && opt_disable_all == 0) {
 195                 ERR("Missing event name(s).\n");
 196                 usage(stderr);
 197                 ret = CMD_SUCCESS;
 198                 goto end;
 199         }
 200
 201         if (!opt_session_name) {
 202                 session_name = get_session_name();
 203                 if (session_name == NULL) {
 204                         ret = -1;
 205                         goto end;
 206                 }
 207         } else {
 208                 session_name = opt_session_name;
 209         }
 210
 211         ret = disable_events(session_name);
 212
 213 end:
 214         return ret;
 215 }