src/bin/lttng/commands/stop.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 "../cmd.h"
  29 #include "../conf.h"
  30 #include "../utils.h"
  31
  32 static char *opt_session_name;
  33
  34 enum {
  35         OPT_HELP = 1,
  36 };
  37
  38 static struct poptOption long_options[] = {
  39         /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
  40         {"help",      'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
  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 stop [options] [NAME]\n");
  50         fprintf(ofp, "\n");
  51         fprintf(ofp, "Where NAME is an optional session name. If not specified, lttng will\n");
  52         fprintf(ofp, "get it from the configuration directory (.lttng).\n");
  53         fprintf(ofp, "\n");
  54         fprintf(ofp, "  -h, --help               Show this help\n");
  55         fprintf(ofp, "\n");
  56 }
  57
  58 /*
  59  * Start tracing for all trace of the session.
  60  */
  61 static int stop_tracing(void)
  62 {
  63         int ret = CMD_SUCCESS;
  64         char *session_name;
  65
  66         if (opt_session_name == NULL) {
  67                 session_name = get_session_name();
  68                 if (session_name == NULL) {
  69                         ret = CMD_ERROR;
  70                         goto error;
  71                 }
  72         } else {
  73                 session_name = opt_session_name;
  74         }
  75
  76         ret = lttng_stop_tracing(session_name);
  77         if (ret < 0) {
  78                 goto free_name;
  79         }
  80
  81         MSG("Tracing stopped for session %s", session_name);
  82
  83 free_name:
  84         if (opt_session_name == NULL) {
  85                 free(session_name);
  86         }
  87
  88 error:
  89         return ret;
  90 }
  91
  92 /*
  93  *  cmd_stop
  94  *
  95  *  The 'stop <options>' first level command
  96  */
  97 int cmd_stop(int argc, const char **argv)
  98 {
  99         int opt, ret;
 100         static poptContext pc;
 101
 102         pc = poptGetContext(NULL, argc, argv, long_options, 0);
 103         poptReadDefaultConfig(pc, 0);
 104
 105         while ((opt = poptGetNextOpt(pc)) != -1) {
 106                 switch (opt) {
 107                 case OPT_HELP:
 108                         usage(stderr);
 109                         ret = CMD_SUCCESS;
 110                         goto end;
 111                 default:
 112                         usage(stderr);
 113                         ret = CMD_UNDEFINED;
 114                         goto end;
 115                 }
 116         }
 117
 118         opt_session_name = (char*) poptGetArg(pc);
 119
 120         ret = stop_tracing();
 121
 122 end:
 123         return ret;
 124 }