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 #include <common/utils.h>
  31
  32 static char *opt_session_name;
  33 static int opt_destroy_all;
  34
  35 enum {
  36         OPT_HELP = 1,
  37         OPT_LIST_OPTIONS,
  38 };
  39
  40 static struct poptOption long_options[] = {
  41         /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
  42         {"help",      'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
  43         {"all",       'a', POPT_ARG_VAL, &opt_destroy_all, 1, 0, 0},
  44         {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
  45         {0, 0, 0, 0, 0, 0, 0}
  46 };
  47
  48 /*
  49  * usage
  50  */
  51 static void usage(FILE *ofp)
  52 {
  53         fprintf(ofp, "usage: lttng destroy [NAME] [OPTIONS]\n");
  54         fprintf(ofp, "\n");
  55         fprintf(ofp, "Where NAME is an optional session name. If not specified, lttng will\n");
  56         fprintf(ofp, "get it from the configuration directory (.lttng).\n");
  57         fprintf(ofp, "\n");
  58         fprintf(ofp, "Options:\n");
  59         fprintf(ofp, "  -h, --help           Show this help\n");
  60         fprintf(ofp, "  -a, --all            Destroy all sessions\n");
  61         fprintf(ofp, "      --list-options   Simple listing of options\n");
  62         fprintf(ofp, "\n");
  63 }
  64
  65 /*
  66  * destroy_session
  67  *
  68  * Unregister the provided session to the session daemon. On success, removes
  69  * the default configuration.
  70  */
  71 static int destroy_session(const char *session_name)
  72 {
  73         int ret;
  74         char *default_session_name = NULL;
  75
  76         ret = lttng_destroy_session(session_name);
  77         if (ret < 0) {
  78                 switch (-ret) {
  79                 case LTTNG_ERR_SESS_NOT_FOUND:
  80                         WARN("Session name %s not found", session_name);
  81                         break;
  82                 default:
  83                         ERR("%s", lttng_strerror(ret));
  84                         break;
  85                 }
  86                 goto error;
  87         }
  88
  89         MSG("Session %s destroyed", session_name);
  90
  91         default_session_name = get_session_name_quiet();
  92         if (default_session_name &&
  93                 !strncmp(session_name, session_name, NAME_MAX)) {
  94                 config_destroy_default();
  95         }
  96         ret = CMD_SUCCESS;
  97 error:
  98         free(default_session_name);
  99         return ret;
 100 }
 101
 102 /*
 103  * destroy_all_sessions
 104  *
 105  * Call destroy_sessions for each registered sessions
 106  */
 107 static int destroy_all_sessions()
 108 {
 109         int count, i, ret = CMD_SUCCESS;
 110         struct lttng_session *sessions;
 111
 112         count = lttng_list_sessions(&sessions);
 113         if (count == 0) {
 114                 MSG("No session found, nothing to do.");
 115         } else if (count < 0) {
 116                 ERR("%s", lttng_strerror(ret));
 117                 goto error;
 118         }
 119
 120         for (i = 0; i < count; i++) {
 121                 ret = destroy_session(sessions[i].name);
 122                 if (ret < 0) {
 123                         goto error;
 124                 }
 125         }
 126 error:
 127         return ret;
 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         /* Ignore session name in case all sessions are to be destroyed */
 160         if (opt_destroy_all) {
 161                 ret = destroy_all_sessions();
 162                 goto end;
 163         }
 164
 165         opt_session_name = (char *) poptGetArg(pc);
 166
 167         if (opt_session_name == NULL) {
 168                 /* No session name specified, lookup default */
 169                 session_name = get_session_name();
 170                 if (session_name == NULL) {
 171                         ret = CMD_ERROR;
 172                         goto end;
 173                 }
 174         } else {
 175                 session_name = opt_session_name;
 176         }
 177
 178         ret = destroy_session(session_name);
 179
 180 end:
 181         if (opt_session_name == NULL) {
 182                 free(session_name);
 183         }
 184
 185         poptFreeContext(pc);
 186         return ret;
 187 }