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
  34 enum {
  35         OPT_HELP = 1,
  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         {0, 0, 0, 0, 0, 0, 0}
  42 };
  43
  44 /*
  45  * usage
  46  */
  47 static void usage(FILE *ofp)
  48 {
  49         fprintf(ofp, "usage: lttng destroy [options] [NAME]\n");
  50         fprintf(ofp, "\n");
  51         fprintf(ofp, "Where NAME is an optional session name. If not specified, lttng will\n");
  52         fprintf(ofp, "get it from the configuration directory (.lttng).\n");
  53         fprintf(ofp, "\n");
  54         fprintf(ofp, "  -h, --help           Show this help\n");
  55         fprintf(ofp, "\n");
  56 }
  57
  58 /*
  59  *  destroy_session
  60  *
  61  *  Destroy a session removing the config directory and unregistering to the
  62  *  session daemon.
  63  */
  64 static int destroy_session()
  65 {
  66         int ret;
  67         char *session_name, *path;
  68
  69         if (opt_session_name == NULL) {
  70                 session_name = get_session_name();
  71                 if (session_name == NULL) {
  72                         ret = CMD_ERROR;
  73                         goto error;
  74                 }
  75         } else {
  76                 session_name = opt_session_name;
  77         }
  78
  79         ret = lttng_destroy_session(session_name);
  80         if (ret < 0) {
  81                 goto free_name;
  82         }
  83
  84         path = config_get_default_path();
  85         if (path == NULL) {
  86                 ret = CMD_FATAL;
  87                 goto free_name;
  88         }
  89
  90         if (opt_session_name == NULL) {
  91                 config_destroy(path);
  92                 MSG("Session %s destroyed at %s", session_name, path);
  93         } else {
  94                 MSG("Session %s destroyed", session_name);
  95         }
  96
  97         ret = CMD_SUCCESS;
  98
  99 free_name:
 100         if (opt_session_name == NULL) {
 101                 free(session_name);
 102         }
 103 error:
 104         return ret;
 105 }
 106
 107 /*
 108  *  cmd_destroy
 109  *
 110  *  The 'destroy <options>' first level command
 111  */
 112 int cmd_destroy(int argc, const char **argv)
 113 {
 114         int opt, ret = CMD_SUCCESS;
 115         static poptContext pc;
 116
 117         pc = poptGetContext(NULL, argc, argv, long_options, 0);
 118         poptReadDefaultConfig(pc, 0);
 119
 120         while ((opt = poptGetNextOpt(pc)) != -1) {
 121                 switch (opt) {
 122                 case OPT_HELP:
 123                         usage(stderr);
 124                         goto end;
 125                 default:
 126                         usage(stderr);
 127                         ret = CMD_UNDEFINED;
 128                         goto end;
 129                 }
 130         }
 131
 132         opt_session_name = (char*) poptGetArg(pc);
 133
 134         ret = destroy_session();
 135
 136 end:
 137         return ret;
 138 }