src/bin/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 "../command.h"
  29
  30 static char *opt_channels;
  31 static int opt_kernel;
  32 static char *opt_session_name;
  33 static int opt_userspace;
  34 #if 0
  35 /* Not implemented yet */
  36 static char *opt_cmd_name;
  37 static pid_t opt_pid;
  38 #endif
  39
  40 enum {
  41         OPT_HELP = 1,
  42         OPT_USERSPACE,
  43         OPT_LIST_OPTIONS,
  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         {"kernel",         'k', POPT_ARG_VAL, &opt_kernel, 1, 0, 0},
  53 #if 0
  54         /* Not implemented yet */
  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 #else
  58         {"userspace",      'u', POPT_ARG_NONE, 0, OPT_USERSPACE, 0, 0},
  59 #endif
  60         {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
  61         {0, 0, 0, 0, 0, 0, 0}
  62 };
  63
  64 /*
  65  * usage
  66  */
  67 static void usage(FILE *ofp)
  68 {
  69         fprintf(ofp, "usage: lttng disable-channel NAME[,NAME2,...] [options]\n");
  70         fprintf(ofp, "\n");
  71         fprintf(ofp, "  -h, --help               Show this help\n");
  72         fprintf(ofp, "      --list-options       Simple listing of options\n");
  73         fprintf(ofp, "  -s, --session            Apply on session name\n");
  74         fprintf(ofp, "  -k, --kernel             Apply for the kernel tracer\n");
  75 #if 0
  76         fprintf(ofp, "  -u, --userspace [CMD]    Apply for the user-space tracer\n");
  77         fprintf(ofp, "                           If no CMD, the domain used is UST global\n");
  78         fprintf(ofp, "                           or else the domain is UST EXEC_NAME\n");
  79         fprintf(ofp, "  -p, --pid PID            If -u, apply to specific PID (domain: UST PID)\n");
  80 #else
  81         fprintf(ofp, "  -u, --userspace          Apply for the user-space tracer\n");
  82 #endif
  83         fprintf(ofp, "\n");
  84 }
  85
  86 /*
  87  * Disabling channel using the lttng API.
  88  */
  89 static int disable_channels(char *session_name)
  90 {
  91         int ret = CMD_SUCCESS;
  92         char *channel_name;
  93         struct lttng_domain dom;
  94
  95         /* Create lttng domain */
  96         if (opt_kernel) {
  97                 dom.type = LTTNG_DOMAIN_KERNEL;
  98         } else if (opt_userspace) {
  99                 dom.type = LTTNG_DOMAIN_UST;
 100         } else {
 101                 ERR("Please specify a tracer (-k/--kernel or -u/--userspace)");
 102                 ret = CMD_ERROR;
 103                 goto error;
 104         }
 105
 106         handle = lttng_create_handle(session_name, &dom);
 107         if (handle == NULL) {
 108                 ret = -1;
 109                 goto error;
 110         }
 111
 112         /* Strip channel list */
 113         channel_name = strtok(opt_channels, ",");
 114         while (channel_name != NULL) {
 115                 DBG("Disabling channel %s", channel_name);
 116
 117                 ret = lttng_disable_channel(handle, channel_name);
 118                 if (ret < 0) {
 119                         goto error;
 120                 } else {
 121                         MSG("%s channel %s disabled for session %s",
 122                                         opt_kernel ? "Kernel" : "UST", channel_name,
 123                                         session_name);
 124                 }
 125
 126                 /* Next channel */
 127                 channel_name = strtok(NULL, ",");
 128         }
 129
 130 error:
 131         lttng_destroy_handle(handle);
 132
 133         return ret;
 134 }
 135
 136 /*
 137  *  cmd_disable_channels
 138  *
 139  *  Disable channel to trace session
 140  */
 141 int cmd_disable_channels(int argc, const char **argv)
 142 {
 143         int opt, ret;
 144         static poptContext pc;
 145         char *session_name = NULL;
 146
 147         pc = poptGetContext(NULL, argc, argv, long_options, 0);
 148         poptReadDefaultConfig(pc, 0);
 149
 150         while ((opt = poptGetNextOpt(pc)) != -1) {
 151                 switch (opt) {
 152                 case OPT_HELP:
 153                         usage(stderr);
 154                         ret = CMD_SUCCESS;
 155                         goto end;
 156                 case OPT_USERSPACE:
 157                         opt_userspace = 1;
 158                         break;
 159                 case OPT_LIST_OPTIONS:
 160                         list_cmd_options(stdout, long_options);
 161                         ret = CMD_SUCCESS;
 162                         goto end;
 163                 default:
 164                         usage(stderr);
 165                         ret = CMD_UNDEFINED;
 166                         goto end;
 167                 }
 168         }
 169
 170         opt_channels = (char*) poptGetArg(pc);
 171         if (opt_channels == NULL) {
 172                 ERR("Missing channel name(s).\n");
 173                 usage(stderr);
 174                 ret = CMD_SUCCESS;
 175                 goto end;
 176         }
 177
 178         if (!opt_session_name) {
 179                 session_name = get_session_name();
 180                 if (session_name == NULL) {
 181                         ret = -1;
 182                         goto end;
 183                 }
 184         } else {
 185                 session_name = opt_session_name;
 186         }
 187
 188         ret = disable_channels(session_name);
 189
 190 end:
 191         return ret;
 192 }