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
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; only version 2
   7  * of the License.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  17  */
  18
  19 #define _GNU_SOURCE
  20 #include <popt.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <sys/stat.h>
  25 #include <sys/types.h>
  26 #include <unistd.h>
  27
  28 #include "../cmd.h"
  29 #include "../conf.h"
  30 #include "../utils.h"
  31
  32 static char *opt_session_name;
  33 static struct lttng_handle *handle;
  34
  35 enum {
  36         OPT_HELP = 1,
  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         {0, 0, 0, 0, 0, 0, 0}
  43 };
  44
  45 /*
  46  * usage
  47  */
  48 static void usage(FILE *ofp)
  49 {
  50         fprintf(ofp, "usage: lttng destroy [options] [NAME]\n");
  51         fprintf(ofp, "\n");
  52         fprintf(ofp, "Where NAME is an optional session name. If not specified, lttng will\n");
  53         fprintf(ofp, "get it from the configuration directory (.lttng).\n");
  54         fprintf(ofp, "\n");
  55         fprintf(ofp, "  -h, --help           Show this help\n");
  56         fprintf(ofp, "\n");
  57 }
  58
  59 /*
  60  *  destroy_session
  61  *
  62  *  Destroy a session removing the config directory and unregistering to the
  63  *  session daemon.
  64  */
  65 static int destroy_session()
  66 {
  67         int ret;
  68         char *session_name, *path;
  69
  70         if (opt_session_name == NULL) {
  71                 session_name = get_session_name();
  72                 if (session_name == NULL) {
  73                         ret = CMD_ERROR;
  74                         goto error;
  75                 }
  76         } else {
  77                 session_name = opt_session_name;
  78         }
  79
  80         handle = lttng_create_handle(session_name, NULL);
  81         if (handle == NULL) {
  82                 ret = -1;
  83                 goto error;
  84         }
  85
  86         ret = lttng_destroy_session(handle);
  87         if (ret < 0) {
  88                 goto free_name;
  89         }
  90
  91         path = config_get_default_path();
  92         if (path == NULL) {
  93                 ret = CMD_FATAL;
  94                 goto free_name;
  95         }
  96
  97         if (opt_session_name == NULL) {
  98                 config_destroy(path);
  99                 MSG("Session %s destroyed at %s", session_name, path);
 100         } else {
 101                 MSG("Session %s destroyed", session_name);
 102         }
 103
 104         ret = CMD_SUCCESS;
 105
 106 free_name:
 107         if (opt_session_name == NULL) {
 108                 free(session_name);
 109         }
 110 error:
 111         lttng_destroy_handle(handle);
 112
 113         return ret;
 114 }
 115
 116 /*
 117  *  cmd_destroy
 118  *
 119  *  The 'destroy <options>' first level command
 120  */
 121 int cmd_destroy(int argc, const char **argv)
 122 {
 123         int opt, ret = CMD_SUCCESS;
 124         static poptContext pc;
 125
 126         pc = poptGetContext(NULL, argc, argv, long_options, 0);
 127         poptReadDefaultConfig(pc, 0);
 128
 129         while ((opt = poptGetNextOpt(pc)) != -1) {
 130                 switch (opt) {
 131                 case OPT_HELP:
 132                         usage(stderr);
 133                         goto end;
 134                 default:
 135                         usage(stderr);
 136                         ret = CMD_UNDEFINED;
 137                         goto end;
 138                 }
 139         }
 140
 141         opt_session_name = (char*) poptGetArg(pc);
 142
 143         ret = destroy_session();
 144
 145 end:
 146         return ret;
 147 }