ustctl/ustctl.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
  25 #include "ust/ustcmd.h"
  26 #include "usterr.h"
  27
  28 enum command {
  29         CREATE_TRACE=1000,
  30         ALLOC_TRACE,
  31         START_TRACE,
  32         STOP_TRACE,
  33         DESTROY_TRACE,
  34         LIST_MARKERS,
  35         ENABLE_MARKER,
  36         DISABLE_MARKER,
  37         GET_ONLINE_PIDS,
  38         SET_SUBBUF_SIZE,
  39         SET_SUBBUF_NUM,
  40         GET_SUBBUF_SIZE,
  41         GET_SUBBUF_NUM,
  42         GET_SOCK_PATH,
  43         SET_SOCK_PATH,
  44         FORCE_SWITCH,
  45         UNKNOWN
  46 };
  47
  48 struct ust_opts {
  49         enum command cmd;
  50         pid_t *pids;
  51         char *regex;
  52 };
  53
  54 char *progname = NULL;
  55
  56 void usage(void)
  57 {
  58         fprintf(stderr, "usage: %s COMMAND PIDs...\n", progname);
  59         fprintf(stderr, "\nControl the tracing of a process that supports LTTng Userspace Tracing.\n\
  60 \n\
  61 Commands:\n\
  62     --create-trace\t\t\tCreate trace\n\
  63     --alloc-trace\t\t\tAlloc trace\n\
  64     --start-trace\t\t\tStart tracing\n\
  65     --stop-trace\t\t\tStop tracing\n\
  66     --destroy-trace\t\t\tDestroy the trace\n\
  67     --set-subbuf-size \"CHANNEL/bytes\"\tSet the size of subbuffers per channel\n\
  68     --set-subbuf-num \"CHANNEL/n\"\tSet the number of subbuffers per channel\n\
  69     --set-sock-path\t\t\tSet the path of the daemon socket\n\
  70     --get-subbuf-size \"CHANNEL\"\t\tGet the size of subbuffers per channel\n\
  71     --get-subbuf-num \"CHANNEL\"\t\tGet the number of subbuffers per channel\n\
  72     --get-sock-path\t\t\tGet the path of the daemon socket\n\
  73     --enable-marker \"CHANNEL/MARKER\"\tEnable a marker\n\
  74     --disable-marker \"CHANNEL/MARKER\"\tDisable a marker\n\
  75     --list-markers\t\t\tList the markers of the process, their\n\t\t\t\t\t  state and format string\n\
  76     --force-switch\t\t\tForce a subbuffer switch\n\
  77 \
  78 ");
  79 }
  80
  81 int parse_opts_long(int argc, char **argv, struct ust_opts *opts)
  82 {
  83         int c;
  84
  85         opts->pids = NULL;
  86         opts->regex = NULL;
  87
  88         while (1) {
  89                 int option_index = 0;
  90                 static struct option long_options[] = {
  91                         { "create-trace", 0, 0, CREATE_TRACE },
  92                         { "alloc-trace", 0, 0, ALLOC_TRACE },
  93                         { "start-trace", 0, 0, START_TRACE },
  94                         { "stop-trace", 0, 0, STOP_TRACE },
  95                         { "destroy-trace", 0, 0, DESTROY_TRACE },
  96                         { "list-markers", 0, 0, LIST_MARKERS },
  97                         { "enable-marker", 1, 0, ENABLE_MARKER },
  98                         { "disable-marker", 1, 0, DISABLE_MARKER },
  99                         { "help", 0, 0, 'h' },
 100                         { "online-pids", 0, 0, GET_ONLINE_PIDS },
 101                         { "set-subbuf-size", 1, 0, SET_SUBBUF_SIZE },
 102                         { "set-subbuf-num", 1, 0, SET_SUBBUF_NUM },
 103                         { "get-subbuf-size", 1, 0, GET_SUBBUF_SIZE },
 104                         { "get-subbuf-num", 1, 0, GET_SUBBUF_NUM },
 105                         { "get-sock-path", 0, 0, GET_SOCK_PATH },
 106                         { "set-sock-path", 1, 0, SET_SOCK_PATH },
 107                         { "force-switch", 0, 0, FORCE_SWITCH },
 108                         { 0, 0, 0, 0 }
 109                 };
 110
 111                 c = getopt_long(argc, argv, "h", long_options, &option_index);
 112                 if (c == -1)
 113                         break;
 114
 115                 if(c >= 1000)
 116                         opts->cmd = c;
 117
 118                 switch (c) {
 119                 case 0:
 120                         printf("option %s", long_options[option_index].name);
 121                         if (optarg)
 122                                 printf(" with arg %s", optarg);
 123                         printf("\n");
 124                         break;
 125
 126                 case ENABLE_MARKER:
 127                 case DISABLE_MARKER:
 128                 case SET_SUBBUF_SIZE:
 129                 case SET_SUBBUF_NUM:
 130                 case GET_SUBBUF_SIZE:
 131                 case GET_SUBBUF_NUM:
 132                 case SET_SOCK_PATH:
 133                         opts->regex = strdup(optarg);
 134                         break;
 135
 136                 case 'h':
 137                         usage();
 138                         exit(0);
 139
 140                 case '?':
 141                         fprintf(stderr, "Invalid argument\n\n");
 142                         usage();
 143                         exit(1);
 144                 }
 145         }
 146
 147         if (argc - optind > 0 && opts->cmd != GET_ONLINE_PIDS) {
 148                 int i;
 149                 int pididx=0;
 150                 opts->pids = malloc((argc-optind+1) * sizeof(pid_t));
 151
 152                 for(i=optind; i<argc; i++) {
 153                         /* don't take any chances, use a long long */
 154                         long long tmp;
 155                         char *endptr;
 156                         tmp = strtoull(argv[i], &endptr, 10);
 157                         if(*endptr != '\0') {
 158                                 ERR("The pid \"%s\" is invalid.", argv[i]);
 159                                 return 1;
 160                         }
 161                         opts->pids[pididx++] = (pid_t) tmp;
 162                 }
 163                 opts->pids[pididx] = -1;
 164         }
 165
 166         return 0;
 167 }
 168
 169 int main(int argc, char *argv[])
 170 {
 171         pid_t *pidit;
 172         int result;
 173         char *tmp;
 174         struct ust_opts opts;
 175
 176         progname = argv[0];
 177
 178         if(argc <= 1) {
 179                 fprintf(stderr, "No operation specified.\n");
 180                 usage();
 181                 exit(EXIT_FAILURE);
 182         }
 183
 184         result = parse_opts_long(argc, argv, &opts);
 185         if(result) {
 186                 fprintf(stderr, "\n");
 187                 usage();
 188                 exit(EXIT_FAILURE);
 189         }
 190
 191         if(opts.pids == NULL && opts.cmd != GET_ONLINE_PIDS) {
 192                 fprintf(stderr, "No pid specified.\n");
 193                 usage();
 194                 exit(EXIT_FAILURE);
 195         }
 196         if(opts.cmd == UNKNOWN) {
 197                 fprintf(stderr, "No command specified.\n");
 198                 usage();
 199                 exit(EXIT_FAILURE);
 200         }
 201         if (opts.cmd == GET_ONLINE_PIDS) {
 202                 pid_t *pp = ustcmd_get_online_pids();
 203                 unsigned int i = 0;
 204
 205                 if (pp) {
 206                         while (pp[i] != 0) {
 207                                 printf("%u\n", (unsigned int) pp[i]);
 208                                 ++i;
 209                         }
 210                         free(pp);
 211                 }
 212
 213                 exit(EXIT_SUCCESS);
 214         }
 215
 216         pidit = opts.pids;
 217         struct marker_status *cmsf = NULL;
 218
 219         while(*pidit != -1) {
 220                 switch (opts.cmd) {
 221                         case CREATE_TRACE:
 222                                 result = ustcmd_create_trace(*pidit);
 223                                 if (result) {
 224                                         ERR("error while trying to create trace with PID %u\n", (unsigned int) *pidit);
 225                                         break;
 226                                 }
 227                                 break;
 228
 229                         case START_TRACE:
 230                                 result = ustcmd_start_trace(*pidit);
 231                                 if (result) {
 232                                         ERR("error while trying to for trace with PID %u\n", (unsigned int) *pidit);
 233                                         break;
 234                                 }
 235                                 break;
 236
 237                         case STOP_TRACE:
 238                                 result = ustcmd_stop_trace(*pidit);
 239                                 if (result) {
 240                                         ERR("error while trying to stop trace for PID %u\n", (unsigned int) *pidit);
 241                                         break;
 242                                 }
 243                                 break;
 244
 245                         case DESTROY_TRACE:
 246                                 result = ustcmd_destroy_trace(*pidit);
 247                                 if (result) {
 248                                         ERR("error while trying to destroy trace with PID %u\n", (unsigned int) *pidit);
 249                                         break;
 250                                 }
 251                                 break;
 252
 253                         case LIST_MARKERS:
 254                                 cmsf = NULL;
 255                                 if (ustcmd_get_cmsf(&cmsf, *pidit)) {
 256                                         fprintf(stderr,
 257                                                 "error while trying to list markers for"
 258                                                 " PID %u\n", (unsigned int) *pidit);
 259                                         break;
 260                                 }
 261                                 unsigned int i = 0;
 262                                 while (cmsf[i].channel != NULL) {
 263                                         printf("{PID: %u, channel/marker: %s/%s, "
 264                                                 "state: %u, fmt: %s}\n",
 265                                                 (unsigned int) *pidit,
 266                                                 cmsf[i].channel,
 267                                                 cmsf[i].marker,
 268                                                 cmsf[i].state,
 269                                                 cmsf[i].fs);
 270                                         ++i;
 271                                 }
 272                                 ustcmd_free_cmsf(cmsf);
 273                                 break;
 274
 275                         case ENABLE_MARKER:
 276                                 if(opts.regex)
 277                                         ustcmd_set_marker_state(opts.regex, 1, *pidit);
 278                                 break;
 279                         case DISABLE_MARKER:
 280                                 if(opts.regex)
 281                                         ustcmd_set_marker_state(opts.regex, 0, *pidit);
 282                                 break;
 283
 284                         case SET_SUBBUF_SIZE:
 285                                 ustcmd_set_subbuf_size(opts.regex, *pidit);
 286                                 break;
 287
 288                         case SET_SUBBUF_NUM:
 289                                 ustcmd_set_subbuf_num(opts.regex, *pidit);
 290                                 break;
 291
 292                         case GET_SUBBUF_SIZE:
 293                                 result = ustcmd_get_subbuf_size(opts.regex, *pidit);
 294                                 if (result == -1) {
 295                                         ERR("error while trying to get_subuf_size with PID %u\n", (unsigned int) *pidit);
 296                                         break;
 297                                 }
 298
 299                                 printf("the size of subbufers is %d\n", result);
 300                                 break;
 301
 302                         case GET_SUBBUF_NUM:
 303                                 result = ustcmd_get_subbuf_num(opts.regex, *pidit);
 304                                 if (result == -1) {
 305                                         ERR("error while trying to get_subuf_num with PID %u\n", (unsigned int) *pidit);
 306                                         break;
 307                                 }
 308
 309                                 printf("the number of subbufers is %d\n", result);
 310                                 break;
 311
 312                         case ALLOC_TRACE:
 313                                 result = ustcmd_alloc_trace(*pidit);
 314                                 if (result) {
 315                                         ERR("error while trying to alloc trace with PID %u\n", (unsigned int) *pidit);
 316                                         break;
 317                                 }
 318                                 break;
 319
 320                         case GET_SOCK_PATH:
 321                                 result = ustcmd_get_sock_path(&tmp, *pidit);
 322                                 if (result) {
 323                                         ERR("error while trying to get sock path for PID %u\n", (unsigned int) *pidit);
 324                                         break;
 325                                 }
 326                                 printf("the socket path is %s\n", tmp);
 327                                 free(tmp);
 328                                 break;
 329
 330                         case SET_SOCK_PATH:
 331                                 result = ustcmd_set_sock_path(opts.regex, *pidit);
 332                                 if (result) {
 333                                         ERR("error while trying to set sock path for PID %u\n", (unsigned int) *pidit);
 334                                 }
 335                                 break;
 336
 337                         case FORCE_SWITCH:
 338                                 result = ustcmd_force_switch(*pidit);
 339                                 if (result) {
 340                                         ERR("error while trying to force switch for PID %u\n", (unsigned int) *pidit);
 341                                 }
 342                                 break;
 343
 344                         default:
 345                                 ERR("unknown command\n");
 346                         break;
 347                 }
 348
 349                 pidit++;
 350         }
 351
 352         if (opts.pids != NULL) {
 353                 free(opts.pids);
 354         }
 355         if (opts.regex != NULL) {
 356                 free(opts.regex);
 357         }
 358
 359         return 0;
 360 }
 361