lttng/commands/disable_channels.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_channels;
  33 static char *opt_kernel;
  34 static char *opt_session_name;
  35 static int opt_pid_all;
  36 static int opt_userspace;
  37 static pid_t opt_pid;
  38
  39 enum {
  40         OPT_HELP = 1,
  41         OPT_USERSPACE,
  42 };
  43
  44 static struct poptOption long_options[] = {
  45         /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
  46         {"help",           'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
  47         {"session",        's', POPT_ARG_STRING, &opt_session_name, 0, 0, 0},
  48         {"kernel",         'k', POPT_ARG_VAL, &opt_kernel, 1, 0, 0},
  49         {"userspace",      'u', POPT_ARG_NONE, 0, OPT_USERSPACE, 0, 0},
  50         {"all",            0,   POPT_ARG_VAL, &opt_pid_all, 1, 0, 0},
  51         {"pid",            'p', POPT_ARG_INT, &opt_pid, 0, 0, 0},
  52         {0, 0, 0, 0, 0, 0, 0}
  53 };
  54
  55 /*
  56  * usage
  57  */
  58 static void usage(FILE *ofp)
  59 {
  60         fprintf(ofp, "usage: lttng disable-channel NAME[,NAME2,...] [options]\n");
  61         fprintf(ofp, "\n");
  62         fprintf(ofp, "  -h, --help            Show this help\n");
  63         fprintf(ofp, "  -s, --session            Apply on session name\n");
  64         fprintf(ofp, "  -k, --kernel          Apply for the kernel tracer\n");
  65         fprintf(ofp, "  -u, --userspace       Apply for the user-space tracer\n");
  66         fprintf(ofp, "      --all             If -u, apply on all traceable apps\n");
  67         fprintf(ofp, "  -p, --pid PID         If -u, apply on a specific PID\n");
  68         fprintf(ofp, "\n");
  69 }
  70
  71 /*
  72  *  disable_channels
  73  *
  74  *  Disabling channel using the lttng API.
  75  */
  76 static int disable_channels(void)
  77 {
  78         int ret = CMD_SUCCESS;
  79         char *channel_name;
  80         struct lttng_domain dom;
  81
  82         if (set_session_name(opt_session_name) < 0) {
  83                 ret = CMD_ERROR;
  84                 goto error;
  85         }
  86
  87         if (opt_kernel) {
  88                 dom.type = LTTNG_DOMAIN_KERNEL;
  89         }
  90
  91         /* Strip channel list */
  92         channel_name = strtok(opt_channels, ",");
  93         while (channel_name != NULL) {
  94                 /* Kernel tracer action */
  95                 if (opt_kernel) {
  96                         DBG("Disabling kernel channel %s", channel_name);
  97                         ret = lttng_disable_channel(&dom, channel_name);
  98                         if (ret < 0) {
  99                                 goto error;
 100                         } else {
 101                                 MSG("Kernel channel disabled %s", channel_name);
 102                         }
 103                 } else if (opt_userspace) {             /* User-space tracer action */
 104                         /*
 105                          * TODO: Waiting on lttng UST 2.0
 106                          */
 107                         if (opt_pid_all) {
 108                         } else if (opt_pid != 0) {
 109                         }
 110                         ret = CMD_NOT_IMPLEMENTED;
 111                         goto error;
 112                 } else {
 113                         ERR("Please specify a tracer (--kernel or --userspace)");
 114                         goto error;
 115                 }
 116
 117                 /* Next channel */
 118                 channel_name = strtok(NULL, ",");
 119         }
 120
 121 error:
 122         return ret;
 123 }
 124
 125 /*
 126  *  cmd_disable_channels
 127  *
 128  *  Disable channel to trace session
 129  */
 130 int cmd_disable_channels(int argc, const char **argv)
 131 {
 132         int opt, ret;
 133         static poptContext pc;
 134
 135         pc = poptGetContext(NULL, argc, argv, long_options, 0);
 136         poptReadDefaultConfig(pc, 0);
 137
 138         while ((opt = poptGetNextOpt(pc)) != -1) {
 139                 switch (opt) {
 140                 case OPT_HELP:
 141                         usage(stderr);
 142                         ret = CMD_SUCCESS;
 143                         goto end;
 144                 case OPT_USERSPACE:
 145                         opt_userspace = 1;
 146                         break;
 147                 default:
 148                         usage(stderr);
 149                         ret = CMD_UNDEFINED;
 150                         goto end;
 151                 }
 152         }
 153
 154         opt_channels = (char*) poptGetArg(pc);
 155         if (opt_channels == NULL) {
 156                 ERR("Missing channel name(s).\n");
 157                 usage(stderr);
 158                 ret = CMD_SUCCESS;
 159                 goto end;
 160         }
 161
 162         ret = disable_channels();
 163
 164 end:
 165         return ret;
 166 }