lttng/commands/disable_channels.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_channels;
  33 static char *opt_kernel;
  34 static char *opt_session_name;
  35 static int opt_pid_all;
  36 static int opt_userspace;
  37 static char *opt_cmd_name;
  38 static pid_t opt_pid;
  39
  40 enum {
  41         OPT_HELP = 1,
  42         OPT_USERSPACE,
  43 };
  44
  45 static struct lttng_handle *handle;
  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         {"kernel",         'k', POPT_ARG_VAL, &opt_kernel, 1, 0, 0},
  52         {"userspace",      'u', POPT_ARG_STRING | POPT_ARGFLAG_OPTIONAL, &opt_cmd_name, OPT_USERSPACE, 0, 0},
  53         {"all",            0,   POPT_ARG_VAL, &opt_pid_all, 1, 0, 0},
  54         {"pid",            'p', POPT_ARG_INT, &opt_pid, 0, 0, 0},
  55         {0, 0, 0, 0, 0, 0, 0}
  56 };
  57
  58 /*
  59  * usage
  60  */
  61 static void usage(FILE *ofp)
  62 {
  63         fprintf(ofp, "usage: lttng disable-channel NAME[,NAME2,...] [options]\n");
  64         fprintf(ofp, "\n");
  65         fprintf(ofp, "  -h, --help            Show this help\n");
  66         fprintf(ofp, "  -s, --session            Apply on session name\n");
  67         fprintf(ofp, "  -k, --kernel          Apply for the kernel tracer\n");
  68         fprintf(ofp, "  -u, --userspace       Apply for the user-space tracer\n");
  69         fprintf(ofp, "      --all             If -u, apply on all traceable apps\n");
  70         fprintf(ofp, "  -p, --pid PID         If -u, apply on a specific PID\n");
  71         fprintf(ofp, "\n");
  72 }
  73
  74 /*
  75  * Disabling channel using the lttng API.
  76  */
  77 static int disable_channels(char *session_name)
  78 {
  79         int ret = CMD_SUCCESS;
  80         char *channel_name;
  81         struct lttng_domain dom;
  82
  83         if (opt_kernel) {
  84                 dom.type = LTTNG_DOMAIN_KERNEL;
  85         }
  86
  87         handle = lttng_create_handle(session_name, &dom);
  88         if (handle == NULL) {
  89                 ret = -1;
  90                 goto error;
  91         }
  92
  93         /* Strip channel list */
  94         channel_name = strtok(opt_channels, ",");
  95         while (channel_name != NULL) {
  96                 /* Kernel tracer action */
  97                 if (opt_kernel) {
  98                         DBG("Disabling kernel channel %s", channel_name);
  99                         ret = lttng_disable_channel(handle, channel_name);
 100                         if (ret < 0) {
 101                                 goto error;
 102                         } else {
 103                                 MSG("Kernel channel disabled %s", channel_name);
 104                         }
 105                 } else if (opt_userspace) {             /* User-space tracer action */
 106                         /*
 107                          * TODO: Waiting on lttng UST 2.0
 108                          */
 109                         if (opt_pid_all) {
 110                         } else if (opt_pid != 0) {
 111                         }
 112                         ret = CMD_NOT_IMPLEMENTED;
 113                         goto error;
 114                 } else {
 115                         ERR("Please specify a tracer (--kernel or --userspace)");
 116                         goto error;
 117                 }
 118
 119                 /* Next channel */
 120                 channel_name = strtok(NULL, ",");
 121         }
 122
 123 error:
 124         lttng_destroy_handle(handle);
 125
 126         return ret;
 127 }
 128
 129 /*
 130  *  cmd_disable_channels
 131  *
 132  *  Disable channel to trace session
 133  */
 134 int cmd_disable_channels(int argc, const char **argv)
 135 {
 136         int opt, ret;
 137         static poptContext pc;
 138         char *session_name = NULL;
 139
 140         pc = poptGetContext(NULL, argc, argv, long_options, 0);
 141         poptReadDefaultConfig(pc, 0);
 142
 143         while ((opt = poptGetNextOpt(pc)) != -1) {
 144                 switch (opt) {
 145                 case OPT_HELP:
 146                         usage(stderr);
 147                         ret = CMD_SUCCESS;
 148                         goto end;
 149                 case OPT_USERSPACE:
 150                         opt_userspace = 1;
 151                         break;
 152                 default:
 153                         usage(stderr);
 154                         ret = CMD_UNDEFINED;
 155                         goto end;
 156                 }
 157         }
 158
 159         opt_channels = (char*) poptGetArg(pc);
 160         if (opt_channels == NULL) {
 161                 ERR("Missing channel name(s).\n");
 162                 usage(stderr);
 163                 ret = CMD_SUCCESS;
 164                 goto end;
 165         }
 166
 167         if (!opt_session_name) {
 168                 session_name = get_session_name();
 169                 if (session_name == NULL) {
 170                         ret = -1;
 171                         goto end;
 172                 }
 173         } else {
 174                 session_name = opt_session_name;
 175         }
 176
 177         ret = disable_channels(session_name);
 178
 179 end:
 180         return ret;
 181 }