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 int opt_kernel;
  34 static char *opt_channel_name;
  35 static char *opt_session_name;
  36 static int opt_userspace;
  37 static char *opt_cmd_name;
  38 static int opt_disable_all;
  39 static pid_t opt_pid;
  40
  41 enum {
  42         OPT_HELP = 1,
  43         OPT_USERSPACE,
  44 };
  45
  46 static struct lttng_handle *handle;
  47
  48 static struct poptOption long_options[] = {
  49         /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
  50         {"help",           'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
  51         {"session",        's', POPT_ARG_STRING, &opt_session_name, 0, 0, 0},
  52         {"all-events",     'a', POPT_ARG_VAL, &opt_disable_all, 1, 0, 0},
  53         {"channel",        'c', POPT_ARG_STRING, &opt_channel_name, 0, 0, 0},
  54         {"kernel",         'k', POPT_ARG_VAL, &opt_kernel, 1, 0, 0},
  55         {"userspace",      'u', POPT_ARG_STRING | POPT_ARGFLAG_OPTIONAL, &opt_cmd_name, OPT_USERSPACE, 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         Disable 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, "                           If no CMD, the domain used is UST global\n");
  74         fprintf(ofp, "                           or else the domain is UST EXEC_NAME\n");
  75         fprintf(ofp, "  -p, --pid PID            If -u, apply to specific PID (domain: UST PID)\n");
  76         fprintf(ofp, "\n");
  77 }
  78
  79 /*
  80  *  disable_events
  81  *
  82  *  Disabling event using the lttng API.
  83  */
  84 static int disable_events(char *session_name)
  85 {
  86         int err, ret = CMD_SUCCESS;
  87         char *event_name, *channel_name = NULL;
  88         struct lttng_domain dom;
  89
  90         if (opt_channel_name == NULL) {
  91                 err = asprintf(&channel_name, DEFAULT_CHANNEL_NAME);
  92                 if (err < 0) {
  93                         ret = CMD_FATAL;
  94                         goto error;
  95                 }
  96         } else {
  97                 channel_name = opt_channel_name;
  98         }
  99
 100         if (opt_kernel && opt_userspace) {
 101                 ERR("Can't use -k/--kernel and -u/--userspace together");
 102                 ret = CMD_FATAL;
 103                 goto error;
 104         }
 105
 106         if (opt_kernel) {
 107                 dom.type = LTTNG_DOMAIN_KERNEL;
 108         } else if (opt_pid != 0) {
 109                 dom.type = LTTNG_DOMAIN_UST_PID;
 110                 dom.attr.pid = opt_pid;
 111                 DBG("PID %d set to lttng handle", opt_pid);
 112         } else if (opt_userspace && opt_cmd_name == NULL) {
 113                 dom.type = LTTNG_DOMAIN_UST;
 114                 DBG("UST global domain selected");
 115         } else if (opt_userspace && opt_cmd_name != NULL) {
 116                 dom.type = LTTNG_DOMAIN_UST_EXEC_NAME;
 117                 strncpy(dom.attr.exec_name, opt_cmd_name, NAME_MAX);
 118                 dom.attr.exec_name[NAME_MAX - 1] = '\0';
 119         } else {
 120                 ERR("Please specify a tracer (-k/--kernel or -u/--userspace)");
 121                 ret = CMD_NOT_IMPLEMENTED;
 122                 goto error;
 123         }
 124
 125         handle = lttng_create_handle(session_name, &dom);
 126         if (handle == NULL) {
 127                 ret = -1;
 128                 goto error;
 129         }
 130
 131         if (opt_disable_all) {
 132                 ret = lttng_disable_event(handle, NULL, channel_name);
 133                 if (ret < 0) {
 134                         goto error;
 135                 }
 136
 137                 MSG("All %s events are disabled in channel %s",
 138                                 opt_kernel ? "kernel" : "UST", channel_name);
 139                 goto end;
 140         }
 141
 142         /* Strip event list */
 143         event_name = strtok(opt_event_list, ",");
 144         while (event_name != NULL) {
 145                 /* Kernel tracer action */
 146                 if (opt_kernel) {
 147                         DBG("Disabling kernel event %s in channel %s",
 148                                         event_name, channel_name);
 149                 } else if (opt_userspace) {             /* User-space tracer action */
 150                         if (opt_cmd_name != NULL || opt_pid) {
 151                                 MSG("Only supporting tracing all UST processes (-u) for now.");
 152                                 ret = CMD_NOT_IMPLEMENTED;
 153                                 goto error;
 154                         }
 155                         DBG("Disabling UST event %s in channel %s",
 156                                         event_name, channel_name);
 157                 } else {
 158                         ERR("Please specify a tracer (-k/--kernel or -u/--userspace)");
 159                         goto error;
 160                 }
 161
 162                 ret = lttng_disable_event(handle, event_name, channel_name);
 163                 if (ret < 0) {
 164                         MSG("Unable to disable %s event %s in channel %s",
 165                                         opt_kernel ? "kernel" : "UST", event_name,
 166                                         channel_name);
 167                 } else {
 168                         MSG("%s event %s disabled in channel %s",
 169                                         opt_kernel ? "kernel" : "UST", event_name,
 170                                         channel_name);
 171                 }
 172
 173                 /* Next event */
 174                 event_name = strtok(NULL, ",");
 175         }
 176
 177 end:
 178 error:
 179         if (opt_channel_name == NULL) {
 180                 free(channel_name);
 181         }
 182         lttng_destroy_handle(handle);
 183
 184         return ret;
 185 }
 186
 187 /*
 188  *  cmd_disable_events
 189  *
 190  *  Disable event to trace session
 191  */
 192 int cmd_disable_events(int argc, const char **argv)
 193 {
 194         int opt, ret;
 195         static poptContext pc;
 196         char *session_name = NULL;
 197
 198         pc = poptGetContext(NULL, argc, argv, long_options, 0);
 199         poptReadDefaultConfig(pc, 0);
 200
 201         while ((opt = poptGetNextOpt(pc)) != -1) {
 202                 switch (opt) {
 203                 case OPT_HELP:
 204                         usage(stderr);
 205                         ret = CMD_SUCCESS;
 206                         goto end;
 207                 case OPT_USERSPACE:
 208                         opt_userspace = 1;
 209                         break;
 210                 default:
 211                         usage(stderr);
 212                         ret = CMD_UNDEFINED;
 213                         goto end;
 214                 }
 215         }
 216
 217         opt_event_list = (char*) poptGetArg(pc);
 218         if (opt_event_list == NULL && opt_disable_all == 0) {
 219                 ERR("Missing event name(s).\n");
 220                 usage(stderr);
 221                 ret = CMD_SUCCESS;
 222                 goto end;
 223         }
 224
 225         if (!opt_session_name) {
 226                 session_name = get_session_name();
 227                 if (session_name == NULL) {
 228                         ret = -1;
 229                         goto end;
 230                 }
 231         } else {
 232                 session_name = opt_session_name;
 233         }
 234
 235         ret = disable_events(session_name);
 236
 237 end:
 238         return ret;
 239 }