src/bin/lttng/commands/disable_consumer.c

   1 /*
   2  * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com>
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License, version 2 only, as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along with
  14  * this program; if not, write to the Free Software Foundation, Inc., 51
  15  * 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 <time.h>
  26 #include <unistd.h>
  27
  28 #include "../command.h"
  29 #include "../utils.h"
  30
  31 #include <common/defaults.h>
  32 #include <common/sessiond-comm/sessiond-comm.h>
  33 #include <common/uri.h>
  34
  35 static int opt_kernel;
  36 static int opt_userspace;
  37 static char *opt_session_name;
  38
  39 static struct lttng_handle *handle;
  40
  41 enum {
  42         OPT_HELP = 1,
  43         OPT_LIST_OPTIONS,
  44 };
  45
  46 static struct poptOption long_options[] = {
  47         /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
  48         {"help",           'h', POPT_ARG_NONE, NULL, OPT_HELP, NULL, NULL},
  49         {"list-options",     0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
  50         {"session",        's', POPT_ARG_STRING, &opt_session_name, 0, 0, 0},
  51         {"kernel",         'k', POPT_ARG_VAL, &opt_kernel, 1, 0, 0},
  52         {"userspace",      'u', POPT_ARG_VAL, &opt_userspace, 1, 0, 0},
  53         {0, 0, 0, 0, 0, 0, 0}
  54 };
  55
  56 /*
  57  * usage
  58  */
  59 static void usage(FILE *ofp)
  60 {
  61         fprintf(ofp, "usage: lttng disable-consumer [-u|-k] [OPTIONS]\n");
  62         fprintf(ofp, "\n");
  63         fprintf(ofp, "Disable the consumer for a tracing session. This call can\n");
  64         fprintf(ofp, "be done BEFORE tracing has started.\n");
  65         fprintf(ofp, "\n");
  66         fprintf(ofp, "Options:\n");
  67         fprintf(ofp, "  -h, --help           Show this help\n");
  68         fprintf(ofp, "      --list-options   Simple listing of options\n");
  69         fprintf(ofp, "  -s, --session=NAME   Apply to session name\n");
  70         fprintf(ofp, "  -k, --kernel         Apply to the kernel tracer\n");
  71         fprintf(ofp, "  -u, --userspace      Apply to the user-space tracer\n");
  72         fprintf(ofp, "\n");
  73 }
  74
  75 /*
  76  * Disable consumer command.
  77  */
  78 static int disable_consumer(char *session_name)
  79 {
  80         int ret = CMD_SUCCESS;
  81         struct lttng_domain dom;
  82
  83         memset(&dom, 0, sizeof(dom));
  84
  85         /* Create lttng domain */
  86         if (opt_kernel) {
  87                 dom.type = LTTNG_DOMAIN_KERNEL;
  88         } else if (opt_userspace) {
  89                 dom.type = LTTNG_DOMAIN_UST;
  90         } else {
  91                 ERR("Please specify a tracer (-k/--kernel or -u/--userspace)");
  92                 ret = CMD_ERROR;
  93                 goto error;
  94         }
  95
  96         handle = lttng_create_handle(session_name, &dom);
  97         if (handle == NULL) {
  98                 ret = -1;
  99                 goto error;
 100         }
 101
 102         ret = lttng_disable_consumer(handle);
 103         if (ret < 0) {
 104                 ERR("Disabling consumer for session %s: %s", session_name,
 105                                 lttng_strerror(ret));
 106                 goto error;
 107         }
 108
 109         MSG("Consumer disabled successfully");
 110
 111 error:
 112         lttng_destroy_handle(handle);
 113         return ret;
 114 }
 115
 116 /*
 117  * The 'disable-consumer <options>' first level command
 118  *
 119  * Returns one of the CMD_* result constants.
 120  */
 121 int cmd_disable_consumer(int argc, const char **argv)
 122 {
 123         int opt, ret = CMD_SUCCESS;
 124         static poptContext pc;
 125         char *session_name = NULL;
 126
 127         pc = poptGetContext(NULL, argc, argv, long_options, 0);
 128         poptReadDefaultConfig(pc, 0);
 129
 130         while ((opt = poptGetNextOpt(pc)) != -1) {
 131                 switch (opt) {
 132                 case OPT_HELP:
 133                         usage(stdout);
 134                         goto end;
 135                 case OPT_LIST_OPTIONS:
 136                         list_cmd_options(stdout, long_options);
 137                         goto end;
 138                 default:
 139                         usage(stderr);
 140                         ret = CMD_UNDEFINED;
 141                         goto end;
 142                 }
 143         }
 144
 145         /* Get session name */
 146         if (!opt_session_name) {
 147                 session_name = get_session_name();
 148                 if (session_name == NULL) {
 149                         ret = CMD_ERROR;
 150                         goto end;
 151                 }
 152         } else {
 153                 session_name = opt_session_name;
 154         }
 155
 156         ret = disable_consumer(session_name);
 157
 158 end:
 159         if (opt_session_name == NULL) {
 160                 free(session_name);
 161         }
 162
 163         poptFreeContext(pc);
 164         return ret;
 165 }