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 [options] [NAME]\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, "  -h, --help           Show this help\n");
  58         fprintf(ofp, "  -a, --all            Destroy all sessions\n");
  59         fprintf(ofp, "      --list-options   Simple listing of options\n");
  60         fprintf(ofp, "\n");
  61 }
  62
  63 /*
  64  * destroy_session
  65  *
  66  * Unregister the provided session to the session daemon. On success, removes
  67  * the default configuration.
  68  */
  69 static int destroy_session(const char *session_name)
  70 {
  71         int ret;
  72
  73         ret = lttng_destroy_session(session_name);
  74         if (ret < 0) {
  75                 switch (-ret) {
  76                 case LTTCOMM_SESS_NOT_FOUND:
  77                         WARN("Session name %s not found", session_name);
  78                         break;
  79                 default:
  80                         break;
  81                 }
  82                 goto error;
  83         }
  84
  85         MSG("Session %s destroyed", session_name);
  86         config_destroy_default();
  87         ret = CMD_SUCCESS;
  88 error:
  89         return ret;
  90 }
  91
  92 /*
  93  * destroy_all_sessions
  94  *
  95  * Call destroy_sessions for each registered sessions
  96  */
  97 static int destroy_all_sessions()
  98 {
  99         int count, i, ret = CMD_SUCCESS;
 100         struct lttng_session *sessions;
 101
 102         count = lttng_list_sessions(&sessions);
 103         if (count == 0) {
 104                 MSG("No session found, nothing to do.");
 105         }
 106         for (i = 0; i < count; i++) {
 107                 ret = destroy_session(sessions[i].name);
 108                 if (ret < 0) {
 109                         goto error;
 110                 }
 111         }
 112 error:
 113         return ret;
 114 }
 115
 116 /*
 117  * get_default_session_name
 118  *
 119  * Returns the default sessions name, if any
 120  */
 121 static int get_default_session_name(char **name)
 122 {
 123         char *session_name = get_session_name();
 124         if (session_name == NULL) {
 125                 return CMD_ERROR;
 126         }
 127         *name = session_name;
 128         return CMD_SUCCESS;
 129 }
 130
 131 /*
 132  * The 'destroy <options>' first level command
 133  */
 134 int cmd_destroy(int argc, const char **argv)
 135 {
 136         int opt;
 137         int ret = CMD_SUCCESS;
 138         static poptContext pc;
 139         char *session_name = NULL;
 140
 141         pc = poptGetContext(NULL, argc, argv, long_options, 0);
 142         poptReadDefaultConfig(pc, 0);
 143
 144         while ((opt = poptGetNextOpt(pc)) != -1) {
 145                 switch (opt) {
 146                 case OPT_HELP:
 147                         usage(stdout);
 148                         break;
 149                 case OPT_LIST_OPTIONS:
 150                         list_cmd_options(stdout, long_options);
 151                         break;
 152                 default:
 153                         usage(stderr);
 154                         ret = CMD_UNDEFINED;
 155                         break;
 156                 }
 157                 goto end;
 158         }
 159
 160         /* Ignore session name in case all sessions are to be destroyed */
 161         if (opt_destroy_all) {
 162                 ret = destroy_all_sessions();
 163                 goto end;
 164         }
 165
 166         opt_session_name = (char *) poptGetArg(pc);
 167
 168         if (opt_session_name == NULL) {
 169                 /* No session name specified, lookup default */
 170                 session_name = get_session_name();
 171                 if (session_name == NULL) {
 172                         ret = CMD_ERROR;
 173                         goto end;
 174                 }
 175         } else {
 176                 session_name = opt_session_name;
 177         }
 178
 179         ret = destroy_session(session_name);
 180
 181 end:
 182         if (opt_session_name == NULL) {
 183                 free(session_name);
 184         }
 185
 186         poptFreeContext(pc);
 187         return ret;
 188 }