lttng/commands/create.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; either version 2
   7  * of the License, or (at your option) any later version.
   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 <time.h>
  27 #include <unistd.h>
  28
  29 #include "cmd.h"
  30 #include "conf.h"
  31
  32 static char *opt_output_path;
  33 static char *opt_session_name;
  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         {"output",    'o', POPT_ARG_STRING, &opt_output_path, 0, 0, 0},
  43         {0, 0, 0, 0, 0, 0, 0}
  44 };
  45
  46 /*
  47  * usage
  48  */
  49 static void usage(FILE *ofp)
  50 {
  51         fprintf(ofp, "usage: lttng create [options] [NAME]\n");
  52         fprintf(ofp, "\n");
  53         fprintf(ofp, "  -h, --help           Show this help\n");
  54         fprintf(ofp, "  -o, --output PATH    Specify output path\n");
  55         fprintf(ofp, "\n");
  56 }
  57
  58 /*
  59  *  create_session
  60  *
  61  *  Create a tracing session. If no name specified, a default name will be
  62  *  generated.
  63  */
  64 static int create_session()
  65 {
  66         int ret;
  67         char name[NAME_MAX];
  68         char *session_name, *path = NULL, *alloc_path;
  69         time_t rawtime;
  70         struct tm *timeinfo;
  71
  72         /* Auto session name creation */
  73         if (opt_session_name == NULL) {
  74                 time(&rawtime);
  75                 timeinfo = localtime(&rawtime);
  76                 strftime(name, sizeof(name), "auto-%Y%m%d-%H%M%S", timeinfo);
  77                 session_name = name;
  78                 DBG("Auto session name set to %s", session_name);
  79         } else {
  80                 session_name = opt_session_name;
  81         }
  82
  83         /* Auto output path */
  84         if (opt_output_path == NULL) {
  85                 alloc_path = config_get_default_path();
  86                 if (alloc_path == NULL) {
  87                         ret = CMD_FATAL;
  88                         goto error;
  89                 }
  90         } else {
  91                 alloc_path = opt_output_path;
  92         }
  93
  94         path = config_generate_dir_path(alloc_path);
  95         if (path == NULL) {
  96                 ret = CMD_FATAL;
  97                 goto error;
  98         }
  99
 100         /* Init lttng session config */
 101         ret = config_init(path);
 102         if (ret < 0) {
 103                 goto error;
 104         }
 105
 106         ret = config_add_session_name(path, session_name);
 107         if (ret < 0) {
 108                 goto error;
 109         }
 110
 111         ret = lttng_create_session(session_name, path);
 112         if (ret < 0) {
 113                 goto error;
 114         }
 115
 116         MSG("Session %s created.", session_name);
 117         MSG("Working directory of created session is %s", path);
 118
 119         ret = CMD_SUCCESS;
 120
 121 error:
 122         if (alloc_path) {
 123                 free(alloc_path);
 124         }
 125
 126         if (path) {
 127                 free(path);
 128         }
 129         return ret;
 130 }
 131
 132 /*
 133  *  cmd_list
 134  *
 135  *  The 'list <options>' first level command
 136  */
 137 int cmd_create(int argc, const char **argv)
 138 {
 139         int opt, ret = CMD_SUCCESS;
 140         static poptContext pc;
 141
 142         pc = poptGetContext(NULL, argc, argv, long_options, 0);
 143         poptReadDefaultConfig(pc, 0);
 144
 145         while ((opt = poptGetNextOpt(pc)) != -1) {
 146                 switch (opt) {
 147                 case OPT_HELP:
 148                         usage(stderr);
 149                         goto end;
 150                 default:
 151                         usage(stderr);
 152                         ret = CMD_UNDEFINED;
 153                         goto end;
 154                 }
 155         }
 156
 157         opt_session_name = (char*) poptGetArg(pc);
 158
 159         ret = create_session();
 160
 161 end:
 162         return ret;
 163 }