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 poptOption long_options[] = {
  48         /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
  49         {"help",           'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
  50         {"session",        's', POPT_ARG_STRING, &opt_session_name, 0, 0, 0},
  51         {"all-events",     'a', POPT_ARG_VAL, &opt_disable_all, 1, 0, 0},
  52         {"channel",        'c', POPT_ARG_STRING, &opt_channel_name, 0, 0, 0},
  53         {"kernel",         'k', POPT_ARG_VAL, &opt_kernel, 1, 0, 0},
  54         {"userspace",      'u', POPT_ARG_STRING | POPT_ARGFLAG_OPTIONAL, 0, OPT_USERSPACE, 0, 0},
  55         {"all",            0,   POPT_ARG_VAL, &opt_pid_all, 1, 0, 0},
  56         {"pid",            'p', POPT_ARG_INT, &opt_pid, 0, 0, 0},
  57         {0, 0, 0, 0, 0, 0, 0}
  58 };
  59
  60 /*
  61  * usage
  62  */
  63 static void usage(FILE *ofp)
  64 {
  65         fprintf(ofp, "usage: lttng disable-event NAME[,NAME2,...] [options]\n");
  66         fprintf(ofp, "\n");
  67         fprintf(ofp, "  -h, --help               Show this help\n");
  68         fprintf(ofp, "  -s, --session            Apply on session name\n");
  69         fprintf(ofp, "  -c, --channel            Apply on this channel\n");
  70         fprintf(ofp, "  -a, --all-events         Enable all tracepoints\n");
  71         fprintf(ofp, "  -k, --kernel             Apply for the kernel tracer\n");
  72         fprintf(ofp, "  -u, --userspace [CMD]    Apply for the user-space tracer\n");
  73         fprintf(ofp, "      --all                If -u, apply on all traceable apps\n");
  74         fprintf(ofp, "  -p, --pid PID            If -u, apply on a specific PID\n");
  75         fprintf(ofp, "\n");
  76 }
  77
  78 /*
  79  *  disable_events
  80  *
  81  *  Disabling event using the lttng API.
  82  */
  83 static int disable_events(void)
  84 {
  85         int err, ret = CMD_SUCCESS;
  86         char *event_name, *channel_name = NULL;
  87         struct lttng_event ev;
  88         struct lttng_domain dom;
  89
  90         if (set_session_name(opt_session_name) < 0) {
  91                 ret = CMD_ERROR;
  92                 goto error;
  93         }
  94
  95         if (opt_channel_name == NULL) {
  96                 err = asprintf(&channel_name, DEFAULT_CHANNEL_NAME);
  97                 if (err < 0) {
  98                         ret = CMD_FATAL;
  99                         goto error;
 100                 }
 101         } else {
 102                 channel_name = opt_channel_name;
 103         }
 104
 105         if (opt_kernel) {
 106                 dom.type = LTTNG_DOMAIN_KERNEL;
 107         }
 108
 109         if (opt_disable_all) {
 110                 if (opt_kernel) {
 111                         ret = lttng_disable_event(&dom, NULL, channel_name);
 112                         goto error;
 113                 }
 114
 115                 /* TODO: User-space tracer */
 116         }
 117
 118         /* Strip event list */
 119         event_name = strtok(opt_event_list, ",");
 120         while (event_name != NULL) {
 121                 /* Kernel tracer action */
 122                 if (opt_kernel) {
 123                         DBG("Disabling kernel event %s for channel %s",
 124                                         event_name, channel_name);
 125
 126                         /* Copy name and type of the event */
 127                         strncpy(ev.name, event_name, LTTNG_SYMBOL_NAME_LEN);
 128                         ret = lttng_disable_event(&dom, 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 user-space)");
 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         return ret;
 159 }
 160
 161 /*
 162  *  cmd_disable_events
 163  *
 164  *  Disable event to trace session
 165  */
 166 int cmd_disable_events(int argc, const char **argv)
 167 {
 168         int opt, ret;
 169         static poptContext pc;
 170
 171         pc = poptGetContext(NULL, argc, argv, long_options, 0);
 172         poptReadDefaultConfig(pc, 0);
 173
 174         while ((opt = poptGetNextOpt(pc)) != -1) {
 175                 switch (opt) {
 176                 case OPT_HELP:
 177                         usage(stderr);
 178                         ret = CMD_SUCCESS;
 179                         goto end;
 180                 case OPT_USERSPACE:
 181                         opt_userspace = 1;
 182                         opt_cmd_name = poptGetOptArg(pc);
 183                         break;
 184                 default:
 185                         usage(stderr);
 186                         ret = CMD_UNDEFINED;
 187                         goto end;
 188                 }
 189         }
 190
 191         opt_event_list = (char*) poptGetArg(pc);
 192         if (opt_event_list == NULL && opt_disable_all == 0) {
 193                 ERR("Missing event name(s).\n");
 194                 usage(stderr);
 195                 ret = CMD_SUCCESS;
 196                 goto end;
 197         }
 198
 199         ret = disable_events();
 200
 201 end:
 202         return ret;
 203 }