| 1 | /* |
| 2 | * Copyright (C) 2009 Pierre-Marc Fournier |
| 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 as published by |
| 6 | * the Free Software Foundation, either version 3 of the License, or |
| 7 | * (at your option) any later version. |
| 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, see <http://www.gnu.org/licenses/>. |
| 16 | */ |
| 17 | |
| 18 | #define _GNU_SOURCE |
| 19 | |
| 20 | #include <sys/types.h> |
| 21 | #include <sys/shm.h> |
| 22 | #include <fcntl.h> |
| 23 | #include <unistd.h> |
| 24 | #include <pthread.h> |
| 25 | |
| 26 | #include <stdlib.h> |
| 27 | #include <stdio.h> |
| 28 | #include <string.h> |
| 29 | |
| 30 | #include "localerr.h" |
| 31 | #include "ustcomm.h" |
| 32 | |
| 33 | struct list_head buffers = LIST_HEAD_INIT(buffers); |
| 34 | |
| 35 | struct buffer_info { |
| 36 | char *name; |
| 37 | pid_t pid; |
| 38 | struct ustcomm_connection conn; |
| 39 | |
| 40 | int shmid; |
| 41 | int bufstruct_shmid; |
| 42 | |
| 43 | /* the buffer memory */ |
| 44 | void *mem; |
| 45 | /* buffer size */ |
| 46 | int memlen; |
| 47 | /* number of subbuffers in buffer */ |
| 48 | int n_subbufs; |
| 49 | /* size of each subbuffer */ |
| 50 | int subbuf_size; |
| 51 | |
| 52 | /* the buffer information struct */ |
| 53 | void *bufstruct_mem; |
| 54 | |
| 55 | int file_fd; /* output file */ |
| 56 | |
| 57 | struct list_head list; |
| 58 | |
| 59 | long consumed_old; |
| 60 | }; |
| 61 | |
| 62 | /* return value: 0 = subbuffer is finished, it won't produce data anymore |
| 63 | * 1 = got subbuffer successfully |
| 64 | * <0 = error |
| 65 | */ |
| 66 | |
| 67 | #define GET_SUBBUF_OK 1 |
| 68 | #define GET_SUBBUF_DONE 0 |
| 69 | #define GET_SUBBUF_DIED 2 |
| 70 | |
| 71 | int get_subbuffer(struct buffer_info *buf) |
| 72 | { |
| 73 | char *send_msg; |
| 74 | char *received_msg; |
| 75 | char *rep_code; |
| 76 | int retval; |
| 77 | int result; |
| 78 | |
| 79 | asprintf(&send_msg, "get_subbuffer %s", buf->name); |
| 80 | result = ustcomm_send_request(&buf->conn, send_msg, &received_msg); |
| 81 | free(send_msg); |
| 82 | if(result < 0) { |
| 83 | ERR("get_subbuffer: ustcomm_send_request failed"); |
| 84 | return -1; |
| 85 | } |
| 86 | else if(result == 0) { |
| 87 | DBG("app died while being traced"); |
| 88 | return GET_SUBBUF_DIED; |
| 89 | } |
| 90 | |
| 91 | result = sscanf(received_msg, "%as %ld", &rep_code, &buf->consumed_old); |
| 92 | if(result != 2 && result != 1) { |
| 93 | ERR("unable to parse response to get_subbuffer"); |
| 94 | return -1; |
| 95 | } |
| 96 | |
| 97 | DBG("received msg is %s", received_msg); |
| 98 | |
| 99 | if(!strcmp(rep_code, "OK")) { |
| 100 | DBG("got subbuffer %s", buf->name); |
| 101 | retval = GET_SUBBUF_OK; |
| 102 | } |
| 103 | else if(nth_token_is(received_msg, "END", 0) == 1) { |
| 104 | return GET_SUBBUF_DONE; |
| 105 | } |
| 106 | else { |
| 107 | DBG("error getting subbuffer %s", buf->name); |
| 108 | retval = -1; |
| 109 | } |
| 110 | |
| 111 | /* FIMXE: free correctly the stuff */ |
| 112 | free(received_msg); |
| 113 | free(rep_code); |
| 114 | return retval; |
| 115 | } |
| 116 | |
| 117 | int put_subbuffer(struct buffer_info *buf) |
| 118 | { |
| 119 | char *send_msg; |
| 120 | char *received_msg; |
| 121 | char *rep_code; |
| 122 | int retval; |
| 123 | int result; |
| 124 | |
| 125 | asprintf(&send_msg, "put_subbuffer %s %ld", buf->name, buf->consumed_old); |
| 126 | result = ustcomm_send_request(&buf->conn, send_msg, &received_msg); |
| 127 | if(result < 0) { |
| 128 | ERR("put_subbuffer: send_message failed"); |
| 129 | return -1; |
| 130 | } |
| 131 | free(send_msg); |
| 132 | |
| 133 | result = sscanf(received_msg, "%as", &rep_code); |
| 134 | if(result != 1) { |
| 135 | ERR("unable to parse response to put_subbuffer"); |
| 136 | return -1; |
| 137 | } |
| 138 | free(received_msg); |
| 139 | |
| 140 | if(!strcmp(rep_code, "OK")) { |
| 141 | DBG("subbuffer put %s", buf->name); |
| 142 | retval = 1; |
| 143 | } |
| 144 | else { |
| 145 | ERR("invalid response to put_subbuffer"); |
| 146 | } |
| 147 | |
| 148 | free(rep_code); |
| 149 | return retval; |
| 150 | } |
| 151 | |
| 152 | ssize_t patient_write(int fd, const void *buf, size_t count) |
| 153 | { |
| 154 | const char *bufc = (const char *) buf; |
| 155 | int result; |
| 156 | |
| 157 | for(;;) { |
| 158 | result = write(fd, bufc, count); |
| 159 | if(result <= 0) { |
| 160 | return result; |
| 161 | } |
| 162 | count -= result; |
| 163 | bufc += result; |
| 164 | |
| 165 | if(count == 0) { |
| 166 | break; |
| 167 | } |
| 168 | } |
| 169 | |
| 170 | return bufc-(const char *)buf; |
| 171 | } |
| 172 | |
| 173 | int get_subbuffer_died(struct buffer_info *buf) |
| 174 | { |
| 175 | return 0; |
| 176 | } |
| 177 | |
| 178 | //int ltt_do_get_subbuf(struct rchan_buf *buf, struct ltt_channel_buf_struct *ltt_buf, long *pconsumed_old) |
| 179 | //{ |
| 180 | // struct ltt_channel_buf_struct *ltt_buf = buf->bufstruct_mem; |
| 181 | // |
| 182 | ////ust// struct ltt_channel_struct *ltt_channel = (struct ltt_channel_struct *)buf->chan->private_data; |
| 183 | // long consumed_old, consumed_idx, commit_count, write_offset; |
| 184 | // consumed_old = atomic_long_read(<t_buf->consumed); |
| 185 | // consumed_idx = SUBBUF_INDEX(consumed_old, buf->chan); |
| 186 | // commit_count = local_read(<t_buf->commit_count[consumed_idx]); |
| 187 | // /* |
| 188 | // * Make sure we read the commit count before reading the buffer |
| 189 | // * data and the write offset. Correct consumed offset ordering |
| 190 | // * wrt commit count is insured by the use of cmpxchg to update |
| 191 | // * the consumed offset. |
| 192 | // */ |
| 193 | // smp_rmb(); |
| 194 | // write_offset = local_read(<t_buf->offset); |
| 195 | // /* |
| 196 | // * Check that the subbuffer we are trying to consume has been |
| 197 | // * already fully committed. |
| 198 | // */ |
| 199 | // if (((commit_count - buf->chan->subbuf_size) |
| 200 | // & ltt_channel->commit_count_mask) |
| 201 | // - (BUFFER_TRUNC(consumed_old, buf->chan) |
| 202 | // >> ltt_channel->n_subbufs_order) |
| 203 | // != 0) { |
| 204 | // return -EAGAIN; |
| 205 | // } |
| 206 | // /* |
| 207 | // * Check that we are not about to read the same subbuffer in |
| 208 | // * which the writer head is. |
| 209 | // */ |
| 210 | // if ((SUBBUF_TRUNC(write_offset, buf->chan) |
| 211 | // - SUBBUF_TRUNC(consumed_old, buf->chan)) |
| 212 | // == 0) { |
| 213 | // return -EAGAIN; |
| 214 | // } |
| 215 | // |
| 216 | // *pconsumed_old = consumed_old; |
| 217 | // return 0; |
| 218 | //} |
| 219 | |
| 220 | void *consumer_thread(void *arg) |
| 221 | { |
| 222 | struct buffer_info *buf = (struct buffer_info *) arg; |
| 223 | int result; |
| 224 | int died = 0; |
| 225 | |
| 226 | for(;;) { |
| 227 | /* get the subbuffer */ |
| 228 | if(died == 0) { |
| 229 | result = get_subbuffer(buf); |
| 230 | if(result == -1) { |
| 231 | ERR("error getting subbuffer"); |
| 232 | continue; |
| 233 | } |
| 234 | else if(result == GET_SUBBUF_DONE) { |
| 235 | /* this is done */ |
| 236 | break; |
| 237 | } |
| 238 | else if(result == GET_SUBBUF_DIED) { |
| 239 | died = 1; |
| 240 | } |
| 241 | } |
| 242 | if(died == 1) { |
| 243 | result = get_subbuffer_died(buf); |
| 244 | if(result <= 0) { |
| 245 | break; |
| 246 | } |
| 247 | } |
| 248 | |
| 249 | /* write data to file */ |
| 250 | result = patient_write(buf->file_fd, buf->mem + (buf->consumed_old & (buf->n_subbufs * buf->subbuf_size-1)), buf->subbuf_size); |
| 251 | if(result == -1) { |
| 252 | PERROR("write"); |
| 253 | /* FIXME: maybe drop this trace */ |
| 254 | } |
| 255 | |
| 256 | /* put the subbuffer */ |
| 257 | if(died == 0) { |
| 258 | result = put_subbuffer(buf); |
| 259 | if(result == -1) { |
| 260 | ERR("error putting subbuffer"); |
| 261 | break; |
| 262 | } |
| 263 | } |
| 264 | else { |
| 265 | // result = put_subbuffer_died(buf); |
| 266 | } |
| 267 | } |
| 268 | |
| 269 | DBG("thread for buffer %s is stopping", buf->name); |
| 270 | |
| 271 | /* FIXME: destroy, unalloc... */ |
| 272 | |
| 273 | return NULL; |
| 274 | } |
| 275 | |
| 276 | int add_buffer(pid_t pid, char *bufname) |
| 277 | { |
| 278 | struct buffer_info *buf; |
| 279 | char *send_msg; |
| 280 | char *received_msg; |
| 281 | int result; |
| 282 | char *tmp; |
| 283 | int fd; |
| 284 | pthread_t thr; |
| 285 | |
| 286 | buf = (struct buffer_info *) malloc(sizeof(struct buffer_info)); |
| 287 | if(buf == NULL) { |
| 288 | ERR("add_buffer: insufficient memory"); |
| 289 | return -1; |
| 290 | } |
| 291 | |
| 292 | buf->name = bufname; |
| 293 | buf->pid = pid; |
| 294 | |
| 295 | /* connect to app */ |
| 296 | result = ustcomm_connect_app(buf->pid, &buf->conn); |
| 297 | if(result) { |
| 298 | ERR("unable to connect to process"); |
| 299 | return -1; |
| 300 | } |
| 301 | |
| 302 | /* get shmid */ |
| 303 | asprintf(&send_msg, "get_shmid %s", buf->name); |
| 304 | ustcomm_send_request(&buf->conn, send_msg, &received_msg); |
| 305 | free(send_msg); |
| 306 | DBG("got buffer name %s", buf->name); |
| 307 | |
| 308 | result = sscanf(received_msg, "%d %d", &buf->shmid, &buf->bufstruct_shmid); |
| 309 | if(result != 2) { |
| 310 | ERR("unable to parse response to get_shmid"); |
| 311 | return -1; |
| 312 | } |
| 313 | free(received_msg); |
| 314 | DBG("got shmids %d %d", buf->shmid, buf->bufstruct_shmid); |
| 315 | |
| 316 | /* get n_subbufs */ |
| 317 | asprintf(&send_msg, "get_n_subbufs %s", buf->name); |
| 318 | ustcomm_send_request(&buf->conn, send_msg, &received_msg); |
| 319 | free(send_msg); |
| 320 | |
| 321 | result = sscanf(received_msg, "%d", &buf->n_subbufs); |
| 322 | if(result != 1) { |
| 323 | ERR("unable to parse response to get_n_subbufs"); |
| 324 | return -1; |
| 325 | } |
| 326 | free(received_msg); |
| 327 | DBG("got n_subbufs %d", buf->n_subbufs); |
| 328 | |
| 329 | /* get subbuf size */ |
| 330 | asprintf(&send_msg, "get_subbuf_size %s", buf->name); |
| 331 | ustcomm_send_request(&buf->conn, send_msg, &received_msg); |
| 332 | free(send_msg); |
| 333 | |
| 334 | result = sscanf(received_msg, "%d", &buf->subbuf_size); |
| 335 | if(result != 1) { |
| 336 | ERR("unable to parse response to get_subbuf_size"); |
| 337 | return -1; |
| 338 | } |
| 339 | free(received_msg); |
| 340 | DBG("got subbuf_size %d", buf->subbuf_size); |
| 341 | |
| 342 | /* attach memory */ |
| 343 | buf->mem = shmat(buf->shmid, NULL, 0); |
| 344 | if(buf->mem == (void *) 0) { |
| 345 | perror("shmat"); |
| 346 | return -1; |
| 347 | } |
| 348 | DBG("successfully attached buffer memory"); |
| 349 | |
| 350 | buf->bufstruct_mem = shmat(buf->bufstruct_shmid, NULL, 0); |
| 351 | if(buf->bufstruct_mem == (void *) 0) { |
| 352 | perror("shmat"); |
| 353 | return -1; |
| 354 | } |
| 355 | DBG("successfully attached buffer bufstruct memory"); |
| 356 | |
| 357 | /* open file for output */ |
| 358 | asprintf(&tmp, "/tmp/trace/%s_0", buf->name); |
| 359 | result = fd = open(tmp, O_WRONLY | O_CREAT | O_TRUNC, 00600); |
| 360 | if(result == -1) { |
| 361 | PERROR("open"); |
| 362 | return -1; |
| 363 | } |
| 364 | buf->file_fd = fd; |
| 365 | free(tmp); |
| 366 | |
| 367 | //list_add(&buf->list, &buffers); |
| 368 | |
| 369 | pthread_create(&thr, NULL, consumer_thread, buf); |
| 370 | |
| 371 | return 0; |
| 372 | } |
| 373 | |
| 374 | int main(int argc, char **argv) |
| 375 | { |
| 376 | struct ustcomm_ustd ustd; |
| 377 | int result; |
| 378 | |
| 379 | result = ustcomm_init_ustd(&ustd); |
| 380 | if(result == -1) { |
| 381 | ERR("failed to initialize socket"); |
| 382 | return 1; |
| 383 | } |
| 384 | |
| 385 | /* app loop */ |
| 386 | for(;;) { |
| 387 | char *recvbuf; |
| 388 | |
| 389 | /* check for requests on our public socket */ |
| 390 | result = ustcomm_ustd_recv_message(&ustd, &recvbuf, NULL, 100); |
| 391 | if(result == -1) { |
| 392 | ERR("error in ustcomm_ustd_recv_message"); |
| 393 | continue; |
| 394 | } |
| 395 | if(result > 0) { |
| 396 | if(!strncmp(recvbuf, "collect", 7)) { |
| 397 | pid_t pid; |
| 398 | char *bufname; |
| 399 | int result; |
| 400 | |
| 401 | result = sscanf(recvbuf, "%*s %d %50as", &pid, &bufname); |
| 402 | if(result != 2) { |
| 403 | fprintf(stderr, "parsing error: %s\n", recvbuf); |
| 404 | } |
| 405 | |
| 406 | result = add_buffer(pid, bufname); |
| 407 | if(result < 0) { |
| 408 | ERR("error in add_buffer"); |
| 409 | continue; |
| 410 | } |
| 411 | } |
| 412 | |
| 413 | free(recvbuf); |
| 414 | } |
| 415 | } |
| 416 | |
| 417 | return 0; |
| 418 | } |