src/bin/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 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_channels;
  30 static int opt_kernel;
  31 static char *opt_session_name;
  32 static int opt_userspace;
  33 #if 0
  34 /* Not implemented yet */
  35 static char *opt_cmd_name;
  36 static pid_t opt_pid;
  37 #endif
  38
  39 enum {
  40         OPT_HELP = 1,
  41         OPT_USERSPACE,
  42         OPT_LIST_OPTIONS,
  43 };
  44
  45 static struct lttng_handle *handle;
  46
  47 static struct poptOption long_options[] = {
  48         /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
  49         {"help",           'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
  50         {"session",        's', POPT_ARG_STRING, &opt_session_name, 0, 0, 0},
  51         {"kernel",         'k', POPT_ARG_VAL, &opt_kernel, 1, 0, 0},
  52 #if 0
  53         /* Not implemented yet */
  54         {"userspace",      'u', POPT_ARG_STRING | POPT_ARGFLAG_OPTIONAL, &opt_cmd_name, OPT_USERSPACE, 0, 0},
  55         {"pid",            'p', POPT_ARG_INT, &opt_pid, 0, 0, 0},
  56 #else
  57         {"userspace",      'u', POPT_ARG_NONE, 0, OPT_USERSPACE, 0, 0},
  58 #endif
  59         {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
  60         {0, 0, 0, 0, 0, 0, 0}
  61 };
  62
  63 /*
  64  * usage
  65  */
  66 static void usage(FILE *ofp)
  67 {
  68         fprintf(ofp, "usage: lttng disable-channel NAME[,NAME2,...] (-k | -u) [OPTIONS]\n");
  69         fprintf(ofp, "\n");
  70         fprintf(ofp, "Options:\n");
  71         fprintf(ofp, "  -h, --help               Show this help\n");
  72         fprintf(ofp, "      --list-options       Simple listing of options\n");
  73         fprintf(ofp, "  -s, --session NAME       Apply to session name\n");
  74         fprintf(ofp, "  -k, --kernel             Apply to the kernel tracer\n");
  75         fprintf(ofp, "  -u, --userspace          Apply to the user-space tracer\n");
  76         fprintf(ofp, "\n");
  77 }
  78
  79 /*
  80  * Disabling channel using the lttng API.
  81  */
  82 static int disable_channels(char *session_name)
  83 {
  84         int ret = CMD_SUCCESS, warn = 0;
  85         char *channel_name;
  86         struct lttng_domain dom;
  87
  88         memset(&dom, 0, sizeof(dom));
  89
  90         /* Create lttng domain */
  91         if (opt_kernel) {
  92                 dom.type = LTTNG_DOMAIN_KERNEL;
  93         } else if (opt_userspace) {
  94                 dom.type = LTTNG_DOMAIN_UST;
  95         } else {
  96                 ERR("Please specify a tracer (-k/--kernel or -u/--userspace)");
  97                 ret = CMD_ERROR;
  98                 goto error;
  99         }
 100
 101         handle = lttng_create_handle(session_name, &dom);
 102         if (handle == NULL) {
 103                 ret = -1;
 104                 goto error;
 105         }
 106
 107         /* Strip channel list */
 108         channel_name = strtok(opt_channels, ",");
 109         while (channel_name != NULL) {
 110                 DBG("Disabling channel %s", channel_name);
 111
 112                 ret = lttng_disable_channel(handle, channel_name);
 113                 if (ret < 0) {
 114                         ERR("Channel %s: %s (session %s)", channel_name,
 115                                         lttng_strerror(ret), session_name);
 116                         warn = 1;
 117                 } else {
 118                         MSG("%s channel %s disabled for session %s",
 119                                         opt_kernel ? "Kernel" : "UST", channel_name, session_name);
 120                 }
 121
 122                 /* Next channel */
 123                 channel_name = strtok(NULL, ",");
 124         }
 125
 126         ret = CMD_SUCCESS;
 127
 128 error:
 129         if (warn) {
 130                 ret = CMD_WARNING;
 131         }
 132
 133         lttng_destroy_handle(handle);
 134
 135         return ret;
 136 }
 137
 138 /*
 139  *  cmd_disable_channels
 140  *
 141  *  Disable channel to trace session
 142  */
 143 int cmd_disable_channels(int argc, const char **argv)
 144 {
 145         int opt, ret = CMD_SUCCESS;
 146         static poptContext pc;
 147         char *session_name = NULL;
 148
 149         pc = poptGetContext(NULL, argc, argv, long_options, 0);
 150         poptReadDefaultConfig(pc, 0);
 151
 152         while ((opt = poptGetNextOpt(pc)) != -1) {
 153                 switch (opt) {
 154                 case OPT_HELP:
 155                         usage(stdout);
 156                         goto end;
 157                 case OPT_USERSPACE:
 158                         opt_userspace = 1;
 159                         break;
 160                 case OPT_LIST_OPTIONS:
 161                         list_cmd_options(stdout, long_options);
 162                         goto end;
 163                 default:
 164                         usage(stderr);
 165                         ret = CMD_UNDEFINED;
 166                         goto end;
 167                 }
 168         }
 169
 170         opt_channels = (char*) poptGetArg(pc);
 171         if (opt_channels == NULL) {
 172                 ERR("Missing channel name(s).\n");
 173                 usage(stderr);
 174                 ret = CMD_ERROR;
 175                 goto end;
 176         }
 177
 178         if (!opt_session_name) {
 179                 session_name = get_session_name();
 180                 if (session_name == NULL) {
 181                         ret = CMD_ERROR;
 182                         goto end;
 183                 }
 184         } else {
 185                 session_name = opt_session_name;
 186         }
 187
 188         ret = disable_channels(session_name);
 189
 190 end:
 191         if (!opt_session_name && session_name) {
 192                 free(session_name);
 193         }
 194         poptFreeContext(pc);
 195         return ret;
 196 }