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
   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 "../command.h"
  29
  30 static char *opt_session_name;
  31
  32 enum {
  33         OPT_HELP = 1,
  34 };
  35
  36 static struct poptOption long_options[] = {
  37         /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
  38         {"help",      'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
  39         {0, 0, 0, 0, 0, 0, 0}
  40 };
  41
  42 /*
  43  * usage
  44  */
  45 static void usage(FILE *ofp)
  46 {
  47         fprintf(ofp, "usage: lttng destroy [options] [NAME]\n");
  48         fprintf(ofp, "\n");
  49         fprintf(ofp, "Where NAME is an optional session name. If not specified, lttng will\n");
  50         fprintf(ofp, "get it from the configuration directory (.lttng).\n");
  51         fprintf(ofp, "\n");
  52         fprintf(ofp, "  -h, --help           Show this help\n");
  53         fprintf(ofp, "\n");
  54 }
  55
  56 /*
  57  * Destroy a session removing the config directory and unregistering to the
  58  * session daemon.
  59  */
  60 static int destroy_session()
  61 {
  62         int ret;
  63         char *session_name, *path;
  64
  65         if (opt_session_name == NULL) {
  66                 session_name = get_session_name();
  67                 if (session_name == NULL) {
  68                         ret = CMD_ERROR;
  69                         goto error;
  70                 }
  71         } else {
  72                 session_name = opt_session_name;
  73         }
  74
  75         ret = lttng_destroy_session(session_name);
  76         if (ret < 0) {
  77                 goto free_name;
  78         }
  79
  80         path = config_get_default_path();
  81         if (path == NULL) {
  82                 ret = CMD_FATAL;
  83                 goto free_name;
  84         }
  85
  86         if (opt_session_name == NULL) {
  87                 config_destroy(path);
  88                 MSG("Session %s destroyed at %s", session_name, path);
  89         } else {
  90                 MSG("Session %s destroyed", session_name);
  91         }
  92
  93         ret = CMD_SUCCESS;
  94
  95 free_name:
  96         if (opt_session_name == NULL) {
  97                 free(session_name);
  98         }
  99 error:
 100         return ret;
 101 }
 102
 103 /*
 104  * The 'destroy <options>' first level command
 105  */
 106 int cmd_destroy(int argc, const char **argv)
 107 {
 108         int opt, ret = CMD_SUCCESS;
 109         static poptContext pc;
 110
 111         pc = poptGetContext(NULL, argc, argv, long_options, 0);
 112         poptReadDefaultConfig(pc, 0);
 113
 114         while ((opt = poptGetNextOpt(pc)) != -1) {
 115                 switch (opt) {
 116                 case OPT_HELP:
 117                         usage(stderr);
 118                         goto end;
 119                 default:
 120                         usage(stderr);
 121                         ret = CMD_UNDEFINED;
 122                         goto end;
 123                 }
 124         }
 125
 126         opt_session_name = (char*) poptGetArg(pc);
 127
 128         ret = destroy_session();
 129
 130 end:
 131         return ret;
 132 }