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 modify
   5  * it under the terms of the GNU General Public License, version 2 only,
   6  * as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along
  14  * with this program; if not, write to the Free Software Foundation, Inc.,
  15  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  16  */
  17
  18 #define _GNU_SOURCE
  19 #include <popt.h>
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include <sys/stat.h>
  24 #include <sys/types.h>
  25 #include <unistd.h>
  26
  27 #include "../command.h"
  28
  29 static char *opt_session_name;
  30
  31 enum {
  32         OPT_HELP = 1,
  33         OPT_LIST_OPTIONS,
  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         {"list-options",   0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
  40         {0, 0, 0, 0, 0, 0, 0}
  41 };
  42
  43 /*
  44  * usage
  45  */
  46 static void usage(FILE *ofp)
  47 {
  48         fprintf(ofp, "usage: lttng set-session NAME\n");
  49         fprintf(ofp, "\n");
  50         fprintf(ofp, "Options:\n");
  51         fprintf(ofp, "  -h, --help               Show this help\n");
  52         fprintf(ofp, "      --list-options       Simple listing of options\n");
  53         fprintf(ofp, "\n");
  54 }
  55
  56 /*
  57  *  set_session
  58  */
  59 static int set_session(void)
  60 {
  61         int ret = CMD_SUCCESS;
  62
  63         ret = config_init(opt_session_name);
  64         if (ret < 0) {
  65                 ERR("Unable to set session name");
  66                 ret = CMD_ERROR;
  67                 goto error;
  68         }
  69
  70         MSG("Session set to %s", opt_session_name);
  71         ret = CMD_SUCCESS;
  72
  73 error:
  74         return ret;
  75 }
  76
  77 /*
  78  *  cmd_set_session
  79  */
  80 int cmd_set_session(int argc, const char **argv)
  81 {
  82         int opt, ret = CMD_SUCCESS;
  83         static poptContext pc;
  84
  85         pc = poptGetContext(NULL, argc, argv, long_options, 0);
  86         poptReadDefaultConfig(pc, 0);
  87
  88         while ((opt = poptGetNextOpt(pc)) != -1) {
  89                 switch (opt) {
  90                 case OPT_HELP:
  91                         usage(stdout);
  92                         goto end;
  93                 case OPT_LIST_OPTIONS:
  94                         list_cmd_options(stdout, long_options);
  95                         goto end;
  96                 default:
  97                         usage(stderr);
  98                         ret = CMD_UNDEFINED;
  99                         goto end;
 100                 }
 101         }
 102
 103         opt_session_name = (char *) poptGetArg(pc);
 104         if (opt_session_name == NULL) {
 105                 ERR("Missing session name");
 106                 usage(stderr);
 107                 ret = CMD_ERROR;
 108                 goto end;
 109         }
 110
 111         ret = set_session();
 112
 113 end:
 114         poptFreeContext(pc);
 115         return ret;
 116 }