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 int opt_destroy_all;
  32
  33 enum {
  34         OPT_HELP = 1,
  35         OPT_LIST_OPTIONS,
  36 };
  37
  38 static struct poptOption long_options[] = {
  39         /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
  40         {"help",      'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
  41         {"all",       'a', POPT_ARG_VAL, &opt_destroy_all, 1, 0, 0},
  42         {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
  43         {0, 0, 0, 0, 0, 0, 0}
  44 };
  45
  46 /*
  47  * usage
  48  */
  49 static void usage(FILE *ofp)
  50 {
  51         fprintf(ofp, "usage: lttng destroy [options] [NAME]\n");
  52         fprintf(ofp, "\n");
  53         fprintf(ofp, "Where NAME is an optional session name. If not specified, lttng will\n");
  54         fprintf(ofp, "get it from the configuration directory (.lttng).\n");
  55         fprintf(ofp, "\n");
  56         fprintf(ofp, "  -h, --help           Show this help\n");
  57         fprintf(ofp, "  -a, --all            Destroy all sessions\n");
  58         fprintf(ofp, "      --list-options   Simple listing of options\n");
  59         fprintf(ofp, "\n");
  60 }
  61
  62 /*
  63  * destroy_session
  64  *
  65  * Unregister the provided session to the session daemon. On success, removes
  66  * the default configuration.
  67  */
  68 static int destroy_session(const char *session_name)
  69 {
  70         int ret;
  71
  72         ret = lttng_destroy_session(session_name);
  73         if (ret < 0) {
  74                 switch (-ret) {
  75                 case LTTCOMM_SESS_NOT_FOUND:
  76                         WARN("Session name %s not found", session_name);
  77                         break;
  78                 default:
  79                         break;
  80                 }
  81                 goto error;
  82         }
  83
  84         MSG("Session %s destroyed", session_name);
  85         config_destroy_default();
  86         ret = CMD_SUCCESS;
  87 error:
  88         return ret;
  89 }
  90
  91 /*
  92  * destroy_all_sessions
  93  *
  94  * Call destroy_sessions for each registered sessions
  95  */
  96 static int destroy_all_sessions()
  97 {
  98         int count, i, ret = CMD_SUCCESS;
  99         struct lttng_session *sessions;
 100
 101         count = lttng_list_sessions(&sessions);
 102         if (count == 0) {
 103                 MSG("No session found, nothing to do.");
 104         }
 105         for (i = 0; i < count; i++) {
 106                 ret = destroy_session(sessions[i].name);
 107                 if (ret < 0) {
 108                         goto error;
 109                 }
 110         }
 111 error:
 112         return ret;
 113 }
 114
 115 /*
 116  * get_default_session_name
 117  *
 118  * Returns the default sessions name, if any
 119  */
 120 static int get_default_session_name(char **name)
 121 {
 122         char *session_name = get_session_name();
 123         if (session_name == NULL) {
 124                 return CMD_ERROR;
 125         }
 126         *name = session_name;
 127         return CMD_SUCCESS;
 128 }
 129
 130 /*
 131  * The 'destroy <options>' first level command
 132  */
 133 int cmd_destroy(int argc, const char **argv)
 134 {
 135         int opt;
 136         int ret = CMD_SUCCESS;
 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(stdout);
 147                         break;
 148                 case OPT_LIST_OPTIONS:
 149                         list_cmd_options(stdout, long_options);
 150                         break;
 151                 default:
 152                         usage(stderr);
 153                         ret = CMD_UNDEFINED;
 154                         break;
 155                 }
 156                 goto end;
 157         }
 158
 159         session_name = (char *) poptGetArg(pc);
 160
 161         /*
 162          * ignore session name in case all
 163          * sessions are to be destroyed
 164          */
 165         if (opt_destroy_all) {
 166                 ret = destroy_all_sessions();
 167                 goto end;
 168         }
 169         if (session_name == NULL) {
 170                 ret = get_default_session_name(&session_name);
 171                 if (ret < 0 || session_name == NULL) {
 172                         goto end;
 173                 }
 174         }
 175         ret = destroy_session(session_name);
 176
 177 end:
 178         poptFreeContext(pc);
 179         if (session_name != NULL) {
 180                 free(session_name);
 181         }
 182         return ret;
 183 }