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 #include "usterr.h"
  29
  30 enum command {
  31         START_TRACE,
  32         STOP_TRACE,
  33         START,
  34         DESTROY,
  35         LIST_MARKERS,
  36         ENABLE_MARKER,
  37         DISABLE_MARKER,
  38         GET_ONLINE_PIDS,
  39         UNKNOWN
  40 };
  41
  42 struct ust_opts {
  43         enum command cmd;
  44         pid_t *pids;
  45         char* regex;
  46         regex_t preg;
  47         int regex_state;
  48 };
  49
  50 char *progname = NULL;
  51
  52 void usage(void)
  53 {
  54         fprintf(stderr, "usage: %s COMMAND PIDs...\n", progname);
  55         fprintf(stderr, "\nControl the tracing of a process that supports LTTng Userspace Tracing.\n\
  56 \n\
  57 Commands:\n\
  58     --start-trace\t\t\tStart tracing\n\
  59     --stop-trace\t\t\tStop tracing\n\
  60     --destroy-trace\t\t\tDestroy the trace\n\
  61     --enable-marker \"CHANNEL/MARKER\"\tEnable a marker\n\
  62     --disable-marker \"CHANNEL/MARKER\"\tDisable a marker\n\
  63     --list-markers\t\t\tList the markers of the process, their\n\t\t\t\t\t  state and format string\n\
  64 \
  65 ");
  66 }
  67
  68 int parse_opts_long(int argc, char **argv, struct ust_opts *opts)
  69 {
  70         int c;
  71
  72         opts->pids = NULL;
  73         opts->regex = NULL;
  74         opts->regex_state = -1;
  75
  76         while (1) {
  77                 int option_index = 0;
  78                 static struct option long_options[] = {
  79                         {"start-trace", 0, 0, 1000},
  80                         {"stop-trace", 0, 0, 1001},
  81                         {"destroy-trace", 0, 0, 1002},
  82                         {"list-markers", 0, 0, 1004},
  83                         {"print-markers", 0, 0, 1005},
  84                         {"pid", 1, 0, 1006},
  85                         {"enable-marker", 1, 0, 1007},
  86                         {"disable-marker", 1, 0, 1008},
  87                         {"start", 0, 0, 1009},
  88                         {"help", 0, 0, 'h'},
  89                         {"version", 0, 0, 1010},
  90                         {"online-pids", 0, 0, 1011},
  91                         {0, 0, 0, 0}
  92                 };
  93
  94                 c = getopt_long(argc, argv, "h", long_options, &option_index);
  95                 if (c == -1)
  96                         break;
  97
  98                 switch (c) {
  99                 case 0:
 100                         printf("option %s", long_options[option_index].name);
 101                         if (optarg)
 102                                 printf(" with arg %s", optarg);
 103                         printf("\n");
 104                         break;
 105
 106                 case 1000:
 107                         opts->cmd = START_TRACE;
 108                         break;
 109                 case 1001:
 110                         opts->cmd = STOP_TRACE;
 111                         break;
 112                 case 1009:
 113                         opts->cmd = START;
 114                         break;
 115                 case 1002:
 116                         opts->cmd = DESTROY;
 117                         break;
 118                 case 1004:
 119                         opts->cmd = LIST_MARKERS;
 120                         break;
 121                 case 1007:
 122                         opts->cmd = ENABLE_MARKER;
 123                         opts->regex = strdup(optarg);
 124                         break;
 125                 case 1008:
 126                         opts->cmd = DISABLE_MARKER;
 127                         opts->regex = strdup(optarg);
 128                         break;
 129                 case 1011:
 130                         opts->cmd = GET_ONLINE_PIDS;
 131                         break;
 132                 case 'h':
 133                         usage();
 134                         exit(0);
 135                 case 1010:
 136                         printf("Version 0.1\n");
 137
 138                 default:
 139                         /* unknown option or other error; error is
 140                         printed by getopt, just return */
 141                         opts->cmd = UNKNOWN;
 142                         return 1;
 143                 }
 144         }
 145
 146         if (argc - optind > 0 && opts->cmd != GET_ONLINE_PIDS) {
 147                 int i;
 148                 int pididx=0;
 149                 opts->pids = malloc((argc-optind+1) * sizeof(pid_t));
 150
 151                 for(i=optind; i<argc; i++) {
 152                         opts->pids[pididx++] = atoi(argv[i]);
 153                 }
 154                 opts->pids[pididx] = -1;
 155         }
 156
 157         if (opts->cmd == ENABLE_MARKER || opts->cmd == DISABLE_MARKER) {
 158                 if (opts->regex_state = regcomp(&opts->preg, opts->regex, 0)) {
 159                         fprintf(stderr, "Invalid regular expression.\n");
 160                 }
 161         }
 162
 163         return 0;
 164 }
 165
 166 static void regex_change_m_state(struct ust_opts* opts, pid_t pid) {
 167         struct USTcmd_cmsf* cmsf = NULL;
 168         unsigned int i = 0;
 169         int e = (opts->cmd == ENABLE_MARKER);
 170
 171         if (opts->regex_state != 0) {
 172                 return;
 173         }
 174
 175         if (ustcmd_get_cmsf(&cmsf, pid)) {
 176                 fprintf(stderr, "error while trying to get markers for PID "
 177                         "%u\n", (unsigned int) pid);
 178                 return;
 179         }
 180         while (cmsf[i].channel != NULL) {
 181                 char* mc;
 182                 asprintf(&mc, "%s/%s", cmsf[i].channel, cmsf[i].marker);
 183                 if (regexec(&opts->preg, mc, 0, NULL, 0) == 0) {
 184                         /* We got a match! */
 185                         if (ustcmd_set_marker_state(mc,
 186                         e ? USTCMD_MS_ON : USTCMD_MS_OFF, pid)) {
 187                                 fprintf(stderr,
 188                                         "error while trying to %sable marker"
 189                                         "\"%s\" for PID %u\n",
 190                                         e ? "en" : "dis", mc,
 191                                         (unsigned int) pid);
 192                         } else {
 193                                 printf("sucessfully %sabled marker "
 194                                         "\"%s\" for PID %u\n",
 195                                         e ? "en" : "dis", mc,
 196                                         (unsigned int) pid);
 197                         }
 198                 }
 199                 free(mc);
 200                 ++i;
 201         }
 202         ustcmd_free_cmsf(cmsf);
 203 }
 204
 205 int main(int argc, char *argv[])
 206 {
 207         pid_t *pidit;
 208         struct ustcomm_connection conn;
 209         int result;
 210         struct ust_opts opts;
 211
 212         progname = argv[0];
 213
 214         if(argc <= 1) {
 215                 fprintf(stderr, "No operation specified.\n");
 216                 usage();
 217                 exit(EXIT_FAILURE);
 218         }
 219
 220         result = parse_opts_long(argc, argv, &opts);
 221         if(result) {
 222                 usage();
 223                 exit(EXIT_FAILURE);
 224         }
 225
 226         if(opts.pids == NULL && opts.cmd != GET_ONLINE_PIDS) {
 227                 fprintf(stderr, "No pid specified.\n");
 228                 usage();
 229                 exit(EXIT_FAILURE);
 230         }
 231         if(opts.cmd == UNKNOWN) {
 232                 fprintf(stderr, "No command specified.\n");
 233                 usage();
 234                 exit(EXIT_FAILURE);
 235         }
 236         if (opts.cmd == GET_ONLINE_PIDS) {
 237                 pid_t* pp = ustcmd_get_online_pids();
 238                 unsigned int i = 0;
 239
 240                 if (pp) {
 241                         while (pp[i] != 0) {
 242                                 printf("%u\n", (unsigned int) pp[i]);
 243                                 ++i;
 244                         }
 245                         free(pp);
 246                 }
 247
 248                 exit(EXIT_SUCCESS);
 249         }
 250
 251         pidit = opts.pids;
 252         struct USTcmd_cmsf* cmsf = NULL;
 253
 254         while(*pidit != -1) {
 255                 switch (opts.cmd) {
 256                         case START_TRACE:
 257                         if (ustcmd_start_trace(*pidit)) {
 258                                 fprintf(stderr,
 259                                         "error while trying to for trace "
 260                                         "with PID %u\n", (unsigned int) *pidit);
 261                                 break;
 262                         }
 263                         printf("sucessfully started trace for PID %u\n",
 264                                 (unsigned int) *pidit);
 265                         break;
 266
 267                         case STOP_TRACE:
 268                         if (ustcmd_stop_trace(*pidit)) {
 269                                 fprintf(stderr,
 270                                         "error while trying to stop trace "
 271                                         "for PID %u\n", (unsigned int) *pidit);
 272                                 break;
 273                         }
 274                         printf("sucessfully stopped trace for PID %u\n",
 275                                 (unsigned int) *pidit);
 276                         break;
 277
 278                         case START:
 279                         if (ustcmd_setup_and_start(*pidit)) {
 280                                 fprintf(stderr,
 281                                         "error while trying to setup/start "
 282                                         "trace for PID %u\n",
 283                                         (unsigned int) *pidit);
 284                                 break;
 285                         }
 286                         printf("sucessfully setup/started trace for PID %u\n",
 287                                 (unsigned int) *pidit);
 288                         break;
 289
 290                         case DESTROY:
 291                         if (ustcmd_destroy_trace(*pidit)) {
 292                                 fprintf(stderr,
 293                                         "error while trying to destroy "
 294                                         "trace with PID %u\n",
 295                                         (unsigned int) *pidit);
 296                                 break;
 297                         }
 298                         printf("sucessfully destroyed trace for PID %u\n",
 299                                 (unsigned int) *pidit);
 300                         break;
 301
 302                         case LIST_MARKERS:
 303                         cmsf = NULL;
 304                         if (ustcmd_get_cmsf(&cmsf, *pidit)) {
 305                                 fprintf(stderr,
 306                                         "error while trying to list markers for"
 307                                         " PID %u\n", (unsigned int) *pidit);
 308                                 break;
 309                         }
 310                         unsigned int i = 0;
 311                         while (cmsf[i].channel != NULL) {
 312                                 printf("{PID: %u, channel/marker: %s/%s, "
 313                                         "state: %u, fs: %s}\n",
 314                                         (unsigned int) *pidit,
 315                                         cmsf[i].channel,
 316                                         cmsf[i].marker,
 317                                         cmsf[i].state,
 318                                         cmsf[i].fs);
 319                                 ++i;
 320                         }
 321                         ustcmd_free_cmsf(cmsf);
 322                         break;
 323
 324                         case ENABLE_MARKER:
 325                         case DISABLE_MARKER:
 326                                 regex_change_m_state(&opts, *pidit);
 327                         break;
 328
 329                         default:
 330                         fprintf(stderr, "error: unknown command...\n");
 331                         break;
 332                 }
 333
 334                 pidit++;
 335         }
 336
 337         exit_free:
 338         if (opts.pids != NULL) {
 339                 free(opts.pids);
 340         }
 341         if (opts.regex != NULL) {
 342                 free(opts.regex);
 343         }
 344
 345         return 0;
 346 }
 347