ust/ust.c

   1 /* Copyright (C) 2009  Pierre-Marc Fournier
   2  *
   3  * This library is free software; you can redistribute it and/or
   4  * modify it under the terms of the GNU Lesser General Public
   5  * License as published by the Free Software Foundation; either
   6  * version 2.1 of the License, or (at your option) any later version.
   7  *
   8  * This library 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 GNU
  11  * Lesser General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU Lesser General Public
  14  * License along with this library; if not, write to the Free Software
  15  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
  16  */
  17
  18 #define _GNU_SOURCE
  19 #include <stdio.h>
  20 #include <unistd.h>
  21 #include <getopt.h>
  22 #include <stdlib.h>
  23 #include <fcntl.h>
  24 #include <regex.h>
  25
  26 #include "ustcomm.h"
  27 #include "ustcmd.h"
  28
  29 enum command {
  30         START_TRACE,
  31         STOP_TRACE,
  32         START,
  33         DESTROY,
  34         LIST_MARKERS,
  35         ENABLE_MARKER,
  36         DISABLE_MARKER,
  37         GET_ONLINE_PIDS,
  38         UNKNOWN
  39 };
  40
  41 struct ust_opts {
  42         enum command cmd;
  43         pid_t *pids;
  44         char* regex;
  45         regex_t preg;
  46         int regex_state;
  47 };
  48
  49 char *progname = NULL;
  50
  51 void usage(void)
  52 {
  53         fprintf(stderr, "usage: %s COMMAND PIDs...\n", progname);
  54         fprintf(stderr, "\nControl the tracing of a process that supports LTTng Userspace Tracing.\n\
  55 \n\
  56 Commands:\n\
  57     --start-trace\t\t\tStart tracing\n\
  58     --stop-trace\t\t\tStop tracing\n\
  59     --destroy-trace\t\t\tDestroy the trace\n\
  60     --enable-marker \"CHANNEL/MARKER\"\tEnable a marker\n\
  61     --disable-marker \"CHANNEL/MARKER\"\tDisable a marker\n\
  62     --list-markers\t\t\tList the markers of the process, their\n\t\t\t\t\t  state and format string\n\
  63 \
  64 ");
  65 }
  66
  67 int parse_opts_long(int argc, char **argv, struct ust_opts *opts)
  68 {
  69         int c;
  70
  71         opts->pids = NULL;
  72         opts->regex = NULL;
  73         opts->regex_state = -1;
  74
  75         while (1) {
  76                 int option_index = 0;
  77                 static struct option long_options[] = {
  78                         {"start-trace", 0, 0, 1000},
  79                         {"stop-trace", 0, 0, 1001},
  80                         {"destroy-trace", 0, 0, 1002},
  81                         {"list-markers", 0, 0, 1004},
  82                         {"print-markers", 0, 0, 1005},
  83                         {"pid", 1, 0, 1006},
  84                         {"enable-marker", 1, 0, 1007},
  85                         {"disable-marker", 1, 0, 1008},
  86                         {"start", 0, 0, 1009},
  87                         {"help", 0, 0, 'h'},
  88                         {"version", 0, 0, 1010},
  89                         {"online-pids", 0, 0, 1011},
  90                         {0, 0, 0, 0}
  91                 };
  92
  93                 c = getopt_long(argc, argv, "h", long_options, &option_index);
  94                 if (c == -1)
  95                         break;
  96
  97                 switch (c) {
  98                 case 0:
  99                         printf("option %s", long_options[option_index].name);
 100                         if (optarg)
 101                                 printf(" with arg %s", optarg);
 102                         printf("\n");
 103                         break;
 104
 105                 case 1000:
 106                         opts->cmd = START_TRACE;
 107                         break;
 108                 case 1001:
 109                         opts->cmd = STOP_TRACE;
 110                         break;
 111                 case 1009:
 112                         opts->cmd = START;
 113                         break;
 114                 case 1002:
 115                         opts->cmd = DESTROY;
 116                         break;
 117                 case 1004:
 118                         opts->cmd = LIST_MARKERS;
 119                         break;
 120                 case 1007:
 121                         opts->cmd = ENABLE_MARKER;
 122                         opts->regex = strdup(optarg);
 123                         break;
 124                 case 1008:
 125                         opts->cmd = DISABLE_MARKER;
 126                         opts->regex = strdup(optarg);
 127                         break;
 128                 case 1011:
 129                         opts->cmd = GET_ONLINE_PIDS;
 130                         break;
 131                 case 'h':
 132                         usage();
 133                         exit(0);
 134                 case 1010:
 135                         printf("Version 0.1\n");
 136
 137                 default:
 138                         /* unknown option or other error; error is
 139                         printed by getopt, just return */
 140                         opts->cmd = UNKNOWN;
 141                         return 1;
 142                 }
 143         }
 144
 145         if(argc - optind > 0 && opts->cmd != GET_ONLINE_PIDS) {
 146                 int i;
 147                 int pididx=0;
 148                 opts->pids = malloc((argc-optind+1) * sizeof(pid_t));
 149
 150                 for(i=optind; i<argc; i++) {
 151                         opts->pids[pididx++] = atoi(argv[i]);
 152                 }
 153                 opts->pids[pididx] = -1;
 154         }
 155
 156         return 0;
 157 }
 158
 159 int main(int argc, char *argv[])
 160 {
 161         pid_t *pidit;
 162         //char *msg = argv[2];
 163         struct ustcomm_connection conn;
 164         int result;
 165         struct ust_opts opts;
 166
 167         progname = argv[0];
 168
 169         if(argc <= 1) {
 170                 fprintf(stderr, "No operation specified.\n");
 171                 usage();
 172                 exit(EXIT_FAILURE);
 173         }
 174
 175         result = parse_opts_long(argc, argv, &opts);
 176         if(result) {
 177                 usage();
 178                 exit(EXIT_FAILURE);
 179         }
 180
 181         if(opts.pids == NULL && opts.cmd != GET_ONLINE_PIDS) {
 182                 fprintf(stderr, "No pid specified.\n");
 183                 usage();
 184                 exit(EXIT_FAILURE);
 185         }
 186         if(opts.cmd == UNKNOWN) {
 187                 fprintf(stderr, "No command specified.\n");
 188                 usage();
 189                 exit(EXIT_FAILURE);
 190         }
 191         if (opts.cmd == GET_ONLINE_PIDS) {
 192                 pid_t* pp = ustcmd_get_online_pids();
 193                 unsigned int i = 0;
 194
 195                 if (pp) {
 196                         while (pp[i] != 0) {
 197                                 printf("%u\n", (unsigned int) pp[i]);
 198                                 ++i;
 199                         }
 200                         free(pp);
 201                 }
 202
 203                 exit(EXIT_SUCCESS);
 204         }
 205
 206         pidit = opts.pids;
 207         struct USTcmd_cmsf* cmsf = NULL;
 208
 209         while(*pidit != -1) {
 210                 switch (opts.cmd) {
 211                         case START_TRACE:
 212                         if (ustcmd_start_trace(*pidit)) {
 213                                 fprintf(stderr,
 214                                         "error while trying to for trace "
 215                                         "with PID %u\n", (unsigned int) *pidit);
 216                                 break;
 217                         }
 218                         printf("sucessfully started trace for PID %u\n",
 219                                 (unsigned int) *pidit);
 220                         break;
 221
 222                         case STOP_TRACE:
 223                         if (ustcmd_stop_trace(*pidit)) {
 224                                 fprintf(stderr,
 225                                         "error while trying to stop trace "
 226                                         "for PID %u\n", (unsigned int) *pidit);
 227                                 break;
 228                         }
 229                         printf("sucessfully stopped trace for PID %u\n",
 230                                 (unsigned int) *pidit);
 231                         break;
 232
 233                         case START:
 234                         if (ustcmd_setup_and_start(*pidit)) {
 235                                 fprintf(stderr,
 236                                         "error while trying to setup/start "
 237                                         "trace for PID %u\n",
 238                                         (unsigned int) *pidit);
 239                                 break;
 240                         }
 241                         printf("sucessfully setup/started trace for PID %u\n",
 242                                 (unsigned int) *pidit);
 243                         break;
 244
 245                         case DESTROY:
 246                         if (ustcmd_destroy_trace(*pidit)) {
 247                                 fprintf(stderr,
 248                                         "error while trying to destroy "
 249                                         "trace with PID %u\n",
 250                                         (unsigned int) *pidit);
 251                                 break;
 252                         }
 253                         printf("sucessfully destroyed trace for PID %u\n",
 254                                 (unsigned int) *pidit);
 255                         break;
 256
 257                         case LIST_MARKERS:
 258                         cmsf = NULL;
 259                         if (ustcmd_get_cmsf(&cmsf, *pidit)) {
 260                                 fprintf(stderr,
 261                                         "error while trying to list markers for"
 262                                         " PID %u\n", (unsigned int) *pidit);
 263                                 break;
 264                         }
 265                         unsigned int i = 0;
 266                         while (cmsf[i].channel != NULL) {
 267                                 printf("{PID: %u, channel/marker: %s/%s, "
 268                                         "state: %u, fs: %s}\n",
 269                                         (unsigned int) *pidit,
 270                                         cmsf[i].channel,
 271                                         cmsf[i].marker,
 272                                         cmsf[i].state,
 273                                         cmsf[i].fs);
 274                                 ++i;
 275                         }
 276                         ustcmd_free_cmsf(cmsf);
 277                         break;
 278
 279                         case ENABLE_MARKER:
 280                         case DISABLE_MARKER:
 281                                 regex_change_m_state(&opts, *pidit);
 282                         break;
 283
 284                         default:
 285                         fprintf(stderr, "error: unknown command...\n");
 286                         break;
 287                 }
 288
 289                 pidit++;
 290         }
 291
 292         exit_free:
 293         if (opts.pids != NULL) {
 294                 free(opts.pids);
 295         }
 296         if (opts.regex != NULL) {
 297                 free(opts.regex);
 298         }
 299
 300         return 0;
 301 }
 302