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; 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 <time.h>
  27 #include <unistd.h>
  28
  29 #include "cmd.h"
  30 #include "conf.h"
  31 #include "utils.h"
  32
  33 static char *opt_output_path;
  34 static char *opt_session_name;
  35
  36 enum {
  37         OPT_HELP = 1,
  38 };
  39
  40 static struct poptOption long_options[] = {
  41         /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
  42         {"help",      'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
  43         {"output",    'o', POPT_ARG_STRING, &opt_output_path, 0, 0, 0},
  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 create [options] [NAME]\n");
  53         fprintf(ofp, "\n");
  54         fprintf(ofp, "  -h, --help           Show this help\n");
  55         fprintf(ofp, "  -o, --output PATH    Specify output path for traces\n");
  56         fprintf(ofp, "\n");
  57 }
  58
  59 /*
  60  *  create_session
  61  *
  62  *  Create a tracing session. If no name specified, a default name will be
  63  *  generated.
  64  */
  65 static int create_session()
  66 {
  67         int ret;
  68         char name[NAME_MAX];
  69         char *session_name, *traces_path = NULL, *alloc_path = NULL;
  70         time_t rawtime;
  71         struct tm *timeinfo;
  72
  73         /* Auto session name creation */
  74         if (opt_session_name == NULL) {
  75                 time(&rawtime);
  76                 timeinfo = localtime(&rawtime);
  77                 strftime(name, sizeof(name), "auto-%Y%m%d-%H%M%S", timeinfo);
  78                 session_name = name;
  79                 DBG("Auto session name set to %s", session_name);
  80         } else {
  81                 session_name = opt_session_name;
  82         }
  83
  84         /* Auto output path */
  85         if (opt_output_path == NULL) {
  86                 alloc_path = strdup(config_get_default_path());
  87                 if (alloc_path == NULL) {
  88                         ERR("Home path not found.\n \
  89                                  Please specify an output path using -o, --output PATH");
  90                         ret = CMD_FATAL;
  91                         goto error;
  92                 }
  93
  94                 ret = asprintf(&traces_path, "%s/" LTTNG_DEFAULT_TRACE_DIR_NAME, alloc_path);
  95                 if (ret < 0) {
  96                         perror("asprintf trace dir name");
  97                         goto error;
  98                 }
  99         } else {
 100                 traces_path = opt_output_path;
 101         }
 102
 103         ret = lttng_create_session(session_name, traces_path);
 104         if (ret < 0) {
 105                 goto error;
 106         }
 107
 108         /* Init lttng session config */
 109         ret = config_init(session_name);
 110         if (ret < 0) {
 111                 goto error;
 112         }
 113
 114         MSG("Session %s created.", session_name);
 115         MSG("Traces will be written in %s/%s-<date>-<time> ", traces_path, session_name);
 116
 117         ret = CMD_SUCCESS;
 118
 119 error:
 120         if (alloc_path) {
 121                 free(alloc_path);
 122         }
 123
 124         if (traces_path) {
 125                 free(traces_path);
 126         }
 127         return ret;
 128 }
 129
 130 /*
 131  *  cmd_list
 132  *
 133  *  The 'list <options>' first level command
 134  */
 135 int cmd_create(int argc, const char **argv)
 136 {
 137         int opt, ret = CMD_SUCCESS;
 138         static poptContext pc;
 139
 140         pc = poptGetContext(NULL, argc, argv, long_options, 0);
 141         poptReadDefaultConfig(pc, 0);
 142
 143         while ((opt = poptGetNextOpt(pc)) != -1) {
 144                 switch (opt) {
 145                 case OPT_HELP:
 146                         usage(stderr);
 147                         goto end;
 148                 default:
 149                         usage(stderr);
 150                         ret = CMD_UNDEFINED;
 151                         goto end;
 152                 }
 153         }
 154
 155         opt_session_name = (char*) poptGetArg(pc);
 156
 157         ret = create_session();
 158
 159 end:
 160         return ret;
 161 }