src/bin/lttng/commands/destroy.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 modify
   5  * it under the terms of the GNU General Public License, version 2 only,
   6  * as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along
  14  * with this program; if not, write to the Free Software Foundation, Inc.,
  15  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  16  */
  17
  18 #define _GNU_SOURCE
  19 #include <popt.h>
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include <sys/stat.h>
  24 #include <sys/types.h>
  25 #include <unistd.h>
  26
  27 #include "../command.h"
  28
  29 #include <common/sessiond-comm/sessiond-comm.h>
  30
  31 static char *opt_session_name;
  32 static int opt_destroy_all;
  33
  34 enum {
  35         OPT_HELP = 1,
  36         OPT_LIST_OPTIONS,
  37 };
  38
  39 static struct poptOption long_options[] = {
  40         /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
  41         {"help",      'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
  42         {"all",       'a', POPT_ARG_VAL, &opt_destroy_all, 1, 0, 0},
  43         {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
  44         {0, 0, 0, 0, 0, 0, 0}
  45 };
  46
  47 /*
  48  * usage
  49  */
  50 static void usage(FILE *ofp)
  51 {
  52         fprintf(ofp, "usage: lttng destroy [NAME] [OPTIONS]\n");
  53         fprintf(ofp, "\n");
  54         fprintf(ofp, "Where NAME is an optional session name. If not specified, lttng will\n");
  55         fprintf(ofp, "get it from the configuration directory (.lttng).\n");
  56         fprintf(ofp, "\n");
  57         fprintf(ofp, "Options:\n");
  58         fprintf(ofp, "  -h, --help           Show this help\n");
  59         fprintf(ofp, "  -a, --all            Destroy all sessions\n");
  60         fprintf(ofp, "      --list-options   Simple listing of options\n");
  61         fprintf(ofp, "\n");
  62 }
  63
  64 /*
  65  * destroy_session
  66  *
  67  * Unregister the provided session to the session daemon. On success, removes
  68  * the default configuration.
  69  */
  70 static int destroy_session(const char *session_name)
  71 {
  72         int ret;
  73
  74         ret = lttng_destroy_session(session_name);
  75         if (ret < 0) {
  76                 switch (-ret) {
  77                 case LTTNG_ERR_SESS_NOT_FOUND:
  78                         WARN("Session name %s not found", session_name);
  79                         break;
  80                 default:
  81                         ERR("%s", lttng_strerror(ret));
  82                         break;
  83                 }
  84                 goto error;
  85         }
  86
  87         MSG("Session %s destroyed", session_name);
  88         config_destroy_default();
  89         ret = CMD_SUCCESS;
  90 error:
  91         return ret;
  92 }
  93
  94 /*
  95  * destroy_all_sessions
  96  *
  97  * Call destroy_sessions for each registered sessions
  98  */
  99 static int destroy_all_sessions()
 100 {
 101         int count, i, ret = CMD_SUCCESS;
 102         struct lttng_session *sessions;
 103
 104         count = lttng_list_sessions(&sessions);
 105         if (count == 0) {
 106                 MSG("No session found, nothing to do.");
 107         } else if (count < 0) {
 108                 ERR("%s", lttng_strerror(ret));
 109                 goto error;
 110         }
 111
 112         for (i = 0; i < count; i++) {
 113                 ret = destroy_session(sessions[i].name);
 114                 if (ret < 0) {
 115                         goto error;
 116                 }
 117         }
 118 error:
 119         return ret;
 120 }
 121
 122 /*
 123  * The 'destroy <options>' first level command
 124  */
 125 int cmd_destroy(int argc, const char **argv)
 126 {
 127         int opt;
 128         int ret = CMD_SUCCESS;
 129         static poptContext pc;
 130         char *session_name = NULL;
 131
 132         pc = poptGetContext(NULL, argc, argv, long_options, 0);
 133         poptReadDefaultConfig(pc, 0);
 134
 135         while ((opt = poptGetNextOpt(pc)) != -1) {
 136                 switch (opt) {
 137                 case OPT_HELP:
 138                         usage(stdout);
 139                         break;
 140                 case OPT_LIST_OPTIONS:
 141                         list_cmd_options(stdout, long_options);
 142                         break;
 143                 default:
 144                         usage(stderr);
 145                         ret = CMD_UNDEFINED;
 146                         break;
 147                 }
 148                 goto end;
 149         }
 150
 151         /* TODO: mi support */
 152         if (lttng_opt_mi) {
 153                 ret = -LTTNG_ERR_MI_NOT_IMPLEMENTED;
 154                 ERR("mi option not supported");
 155                 goto end;
 156         }
 157
 158         /* Ignore session name in case all sessions are to be destroyed */
 159         if (opt_destroy_all) {
 160                 ret = destroy_all_sessions();
 161                 goto end;
 162         }
 163
 164         opt_session_name = (char *) poptGetArg(pc);
 165
 166         if (opt_session_name == NULL) {
 167                 /* No session name specified, lookup default */
 168                 session_name = get_session_name();
 169                 if (session_name == NULL) {
 170                         ret = CMD_ERROR;
 171                         goto end;
 172                 }
 173         } else {
 174                 session_name = opt_session_name;
 175         }
 176
 177         ret = destroy_session(session_name);
 178
 179 end:
 180         if (opt_session_name == NULL) {
 181                 free(session_name);
 182         }
 183
 184         poptFreeContext(pc);
 185         return ret;
 186 }