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
   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 "../command.h"
  29
  30 static char *opt_channels;
  31 static int opt_kernel;
  32 static char *opt_session_name;
  33 static int opt_userspace;
  34 #if 0
  35 /* Not implemented yet */
  36 static char *opt_cmd_name;
  37 static pid_t opt_pid;
  38 #endif
  39
  40 enum {
  41         OPT_HELP = 1,
  42         OPT_USERSPACE,
  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         {0, 0, 0, 0, 0, 0, 0}
  60 };
  61
  62 /*
  63  * usage
  64  */
  65 static void usage(FILE *ofp)
  66 {
  67         fprintf(ofp, "usage: lttng disable-channel NAME[,NAME2,...] [options]\n");
  68         fprintf(ofp, "\n");
  69         fprintf(ofp, "  -h, --help               Show this help\n");
  70         fprintf(ofp, "  -s, --session            Apply on session name\n");
  71         fprintf(ofp, "  -k, --kernel             Apply for the kernel tracer\n");
  72 #if 0
  73         fprintf(ofp, "  -u, --userspace [CMD]    Apply for the user-space tracer\n");
  74         fprintf(ofp, "                           If no CMD, the domain used is UST global\n");
  75         fprintf(ofp, "                           or else the domain is UST EXEC_NAME\n");
  76         fprintf(ofp, "  -p, --pid PID            If -u, apply to specific PID (domain: UST PID)\n");
  77 #else
  78         fprintf(ofp, "  -u, --userspace          Apply for the user-space tracer\n");
  79 #endif
  80         fprintf(ofp, "\n");
  81 }
  82
  83 /*
  84  * Disabling channel using the lttng API.
  85  */
  86 static int disable_channels(char *session_name)
  87 {
  88         int ret = CMD_SUCCESS;
  89         char *channel_name;
  90         struct lttng_domain dom;
  91
  92         /* Create lttng domain */
  93         if (opt_kernel) {
  94                 dom.type = LTTNG_DOMAIN_KERNEL;
  95         } else if (opt_userspace) {
  96                 dom.type = LTTNG_DOMAIN_UST;
  97         } else {
  98                 ERR("Please specify a tracer (-k/--kernel or -u/--userspace)");
  99                 ret = CMD_NOT_IMPLEMENTED;
 100                 goto error;
 101         }
 102
 103         handle = lttng_create_handle(session_name, &dom);
 104         if (handle == NULL) {
 105                 ret = -1;
 106                 goto error;
 107         }
 108
 109         /* Strip channel list */
 110         channel_name = strtok(opt_channels, ",");
 111         while (channel_name != NULL) {
 112                 DBG("Disabling channel %s", channel_name);
 113
 114                 ret = lttng_disable_channel(handle, channel_name);
 115                 if (ret < 0) {
 116                         goto error;
 117                 } else {
 118                         MSG("%s channel %s disabled for session %s",
 119                                         opt_kernel ? "Kernel" : "UST", channel_name,
 120                                         session_name);
 121                 }
 122
 123                 /* Next channel */
 124                 channel_name = strtok(NULL, ",");
 125         }
 126
 127 error:
 128         lttng_destroy_handle(handle);
 129
 130         return ret;
 131 }
 132
 133 /*
 134  *  cmd_disable_channels
 135  *
 136  *  Disable channel to trace session
 137  */
 138 int cmd_disable_channels(int argc, const char **argv)
 139 {
 140         int opt, ret;
 141         static poptContext pc;
 142         char *session_name = NULL;
 143
 144         pc = poptGetContext(NULL, argc, argv, long_options, 0);
 145         poptReadDefaultConfig(pc, 0);
 146
 147         while ((opt = poptGetNextOpt(pc)) != -1) {
 148                 switch (opt) {
 149                 case OPT_HELP:
 150                         usage(stderr);
 151                         ret = CMD_SUCCESS;
 152                         goto end;
 153                 case OPT_USERSPACE:
 154                         opt_userspace = 1;
 155                         break;
 156                 default:
 157                         usage(stderr);
 158                         ret = CMD_UNDEFINED;
 159                         goto end;
 160                 }
 161         }
 162
 163         opt_channels = (char*) poptGetArg(pc);
 164         if (opt_channels == NULL) {
 165                 ERR("Missing channel name(s).\n");
 166                 usage(stderr);
 167                 ret = CMD_SUCCESS;
 168                 goto end;
 169         }
 170
 171         if (!opt_session_name) {
 172                 session_name = get_session_name();
 173                 if (session_name == NULL) {
 174                         ret = -1;
 175                         goto end;
 176                 }
 177         } else {
 178                 session_name = opt_session_name;
 179         }
 180
 181         ret = disable_channels(session_name);
 182
 183 end:
 184         return ret;
 185 }