src/bin/lttng/commands/set_session.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         OPT_LIST_OPTIONS,
  35 };
  36
  37 static struct poptOption long_options[] = {
  38         /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
  39         {"help",           'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
  40         {"list-options",   0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
  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 set-session NAME\n");
  50         fprintf(ofp, "\n");
  51         fprintf(ofp, "Options:\n");
  52         fprintf(ofp, "  -h, --help               Show this help\n");
  53         fprintf(ofp, "      --list-options       Simple listing of options\n");
  54         fprintf(ofp, "\n");
  55 }
  56
  57 /*
  58  *  set_session
  59  */
  60 static int set_session(void)
  61 {
  62         int ret = CMD_SUCCESS;
  63
  64         ret = config_init(opt_session_name);
  65         if (ret < 0) {
  66                 ERR("Unable to set session name");
  67                 ret = CMD_ERROR;
  68                 goto error;
  69         }
  70
  71         MSG("Session set to %s", opt_session_name);
  72         ret = CMD_SUCCESS;
  73
  74 error:
  75         return ret;
  76 }
  77
  78 /*
  79  *  cmd_set_session
  80  */
  81 int cmd_set_session(int argc, const char **argv)
  82 {
  83         int opt, ret = CMD_SUCCESS;
  84         static poptContext pc;
  85
  86         pc = poptGetContext(NULL, argc, argv, long_options, 0);
  87         poptReadDefaultConfig(pc, 0);
  88
  89         while ((opt = poptGetNextOpt(pc)) != -1) {
  90                 switch (opt) {
  91                 case OPT_HELP:
  92                         usage(stderr);
  93                         ret = CMD_SUCCESS;
  94                         goto end;
  95                 case OPT_LIST_OPTIONS:
  96                         list_cmd_options(stdout, long_options);
  97                         ret = CMD_SUCCESS;
  98                         goto end;
  99                 default:
 100                         usage(stderr);
 101                         ret = CMD_UNDEFINED;
 102                         goto end;
 103                 }
 104         }
 105
 106         opt_session_name = (char *) poptGetArg(pc);
 107         if (opt_session_name == NULL) {
 108                 ERR("Missing session name");
 109                 usage(stderr);
 110                 goto end;
 111         }
 112
 113         ret = set_session();
 114
 115 end:
 116         return ret;
 117 }