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 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 #include <common/sessiond-comm/sessiond-comm.h>
  30
  31 static char *opt_session_name;
  32 static int opt_no_wait;
  33
  34 enum {
  35         OPT_HELP = 1,
  36         OPT_LIST_OPTIONS,
  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         {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
  43         {"no-wait",   'n', POPT_ARG_VAL, &opt_no_wait, 1, 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 stop [NAME] [OPTIONS]\n");
  53         fprintf(ofp, "\n");
  54         fprintf(ofp, "Where NAME is an optional session name. If not specified, lttng will\n");
  55         fprintf(ofp, "get it from the configuration directory (.lttng).\n");
  56         fprintf(ofp, "\n");
  57         fprintf(ofp, "Options:\n");
  58         fprintf(ofp, "  -h, --help               Show this help\n");
  59         fprintf(ofp, "      --list-options       Simple listing of options\n");
  60         fprintf(ofp, "  -n, --no-wait            Don't wait for data availability\n");
  61         fprintf(ofp, "\n");
  62 }
  63
  64 /*
  65  * Start tracing for all trace of the session.
  66  */
  67 static int stop_tracing(void)
  68 {
  69         int ret;
  70         char *session_name;
  71
  72         if (opt_session_name == NULL) {
  73                 session_name = get_session_name();
  74                 if (session_name == NULL) {
  75                         ret = CMD_ERROR;
  76                         goto error;
  77                 }
  78         } else {
  79                 session_name = opt_session_name;
  80         }
  81
  82         if (opt_no_wait) {
  83                 ret = lttng_stop_tracing_no_wait(session_name);
  84         } else {
  85                 ret = lttng_stop_tracing(session_name);
  86         }
  87         if (ret < 0) {
  88                 switch (-ret) {
  89                 case LTTNG_ERR_TRACE_ALREADY_STOPPED:
  90                         WARN("Tracing already stopped for session %s", session_name);
  91                         break;
  92                 default:
  93                         ERR("%s", lttng_strerror(ret));
  94                         break;
  95                 }
  96                 goto free_name;
  97         }
  98
  99         ret = CMD_SUCCESS;
 100
 101         MSG("Tracing stopped for session %s", session_name);
 102
 103 free_name:
 104         if (opt_session_name == NULL) {
 105                 free(session_name);
 106         }
 107
 108 error:
 109         return ret;
 110 }
 111
 112 /*
 113  *  cmd_stop
 114  *
 115  *  The 'stop <options>' first level command
 116  */
 117 int cmd_stop(int argc, const char **argv)
 118 {
 119         int opt, ret = CMD_SUCCESS;
 120         static poptContext pc;
 121
 122         pc = poptGetContext(NULL, argc, argv, long_options, 0);
 123         poptReadDefaultConfig(pc, 0);
 124
 125         while ((opt = poptGetNextOpt(pc)) != -1) {
 126                 switch (opt) {
 127                 case OPT_HELP:
 128                         usage(stdout);
 129                         goto end;
 130                 case OPT_LIST_OPTIONS:
 131                         list_cmd_options(stdout, long_options);
 132                         goto end;
 133                 default:
 134                         usage(stderr);
 135                         ret = CMD_UNDEFINED;
 136                         goto end;
 137                 }
 138         }
 139
 140         opt_session_name = (char*) poptGetArg(pc);
 141
 142         ret = stop_tracing();
 143
 144 end:
 145         poptFreeContext(pc);
 146         return ret;
 147 }