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                         break;
  82                 }
  83                 goto error;
  84         }
  85
  86         MSG("Session %s destroyed", session_name);
  87         config_destroy_default();
  88         ret = CMD_SUCCESS;
  89 error:
  90         return ret;
  91 }
  92
  93 /*
  94  * destroy_all_sessions
  95  *
  96  * Call destroy_sessions for each registered sessions
  97  */
  98 static int destroy_all_sessions()
  99 {
 100         int count, i, ret = CMD_SUCCESS;
 101         struct lttng_session *sessions;
 102
 103         count = lttng_list_sessions(&sessions);
 104         if (count == 0) {
 105                 MSG("No session found, nothing to do.");
 106         }
 107         for (i = 0; i < count; i++) {
 108                 ret = destroy_session(sessions[i].name);
 109                 if (ret < 0) {
 110                         goto error;
 111                 }
 112         }
 113 error:
 114         return ret;
 115 }
 116
 117 /*
 118  * The 'destroy <options>' first level command
 119  */
 120 int cmd_destroy(int argc, const char **argv)
 121 {
 122         int opt;
 123         int ret = CMD_SUCCESS;
 124         static poptContext pc;
 125         char *session_name = NULL;
 126
 127         pc = poptGetContext(NULL, argc, argv, long_options, 0);
 128         poptReadDefaultConfig(pc, 0);
 129
 130         while ((opt = poptGetNextOpt(pc)) != -1) {
 131                 switch (opt) {
 132                 case OPT_HELP:
 133                         usage(stdout);
 134                         break;
 135                 case OPT_LIST_OPTIONS:
 136                         list_cmd_options(stdout, long_options);
 137                         break;
 138                 default:
 139                         usage(stderr);
 140                         ret = CMD_UNDEFINED;
 141                         break;
 142                 }
 143                 goto end;
 144         }
 145
 146         /* Ignore session name in case all sessions are to be destroyed */
 147         if (opt_destroy_all) {
 148                 ret = destroy_all_sessions();
 149                 goto end;
 150         }
 151
 152         opt_session_name = (char *) poptGetArg(pc);
 153
 154         if (opt_session_name == NULL) {
 155                 /* No session name specified, lookup default */
 156                 session_name = get_session_name();
 157                 if (session_name == NULL) {
 158                         ret = CMD_ERROR;
 159                         goto end;
 160                 }
 161         } else {
 162                 session_name = opt_session_name;
 163         }
 164
 165         ret = destroy_session(session_name);
 166
 167 end:
 168         if (opt_session_name == NULL) {
 169                 free(session_name);
 170         }
 171
 172         poptFreeContext(pc);
 173         return ret;
 174 }