darshan-stdio.c 25.2 KB
Newer Older
1 2 3 4 5 6
/*
 * Copyright (C) 2015 University of Chicago.
 * See COPYRIGHT notice in top-level directory.
 *
 */

Philip Carns's avatar
Philip Carns committed
7 8 9 10 11 12
/* TODO list (general) for this module:
 * - finish remaining function wrappers, see log format header
 * - implement reduction operator
 * - add stdio page to darshan-job-summary
 * - figure out what to do about posix module compatibility
 *   - remove stdio counters in POSIX or keep and set to -1?
Philip Carns's avatar
Philip Carns committed
13 14 15 16 17
 *   - affected counters in posix module:
 *     - POSIX_FOPENS
 *     - POSIX_FREADS
 *     - POSIX_FWRITES
 *     - POSIX_FSEEKS
Philip Carns's avatar
Philip Carns committed
18
 * - add regression test cases for all functions captured here
Philip Carns's avatar
Philip Carns committed
19
 *   - especially the scanf and printf variants
Philip Carns's avatar
Philip Carns committed
20 21
 */

Philip Carns's avatar
Philip Carns committed
22 23 24 25 26
/* catalog of stdio functions instrumented by this module
 *
 * functions for opening streams
 * --------------
 * FILE    *fdopen(int, const char *);                      DONE
Philip Carns's avatar
Philip Carns committed
27
 * FILE    *fopen(const char *, const char *);              DONE
Philip Carns's avatar
Philip Carns committed
28
 * FILE    *freopen(const char *, const char *, FILE *);    DONE
Philip Carns's avatar
Philip Carns committed
29 30 31 32 33 34 35
 *
 * functions for closing streams
 * --------------
 * int      fclose(FILE *);                                 DONE
 *
 * functions for flushing streams
 * --------------
Philip Carns's avatar
Philip Carns committed
36
 * int      fflush(FILE *);                                 DONE
Philip Carns's avatar
Philip Carns committed
37 38 39
 *
 * functions for reading data
 * --------------
Philip Carns's avatar
Philip Carns committed
40
 * int      fgetc(FILE *);                                  DONE
Philip Carns's avatar
Philip Carns committed
41
 * char    *fgets(char *, int, FILE *);                     DONE
Philip Carns's avatar
Philip Carns committed
42
 * size_t   fread(void *, size_t, size_t, FILE *);          DONE
Philip Carns's avatar
Philip Carns committed
43 44
 * int      fscanf(FILE *, const char *, ...);              DONE
 * int      vfscanf(FILE *, const char *, va_list);         DONE
Philip Carns's avatar
Philip Carns committed
45
 * int      getc(FILE *);                                   DONE
Philip Carns's avatar
Philip Carns committed
46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68
 * int      getc_unlocked(FILE *);
 * int      getw(FILE *);
 *
 * functions for writing data
 * --------------
 * int      fprintf(FILE *, const char *, ...);
 * int      fputc(int, FILE *);
 * int      fputs(const char *, FILE *);
 * size_t   fwrite(const void *, size_t, size_t, FILE *);   DONE
 * int      putc(int, FILE *);
 * int      putc_unlocked(int, FILE *);
 * int      putw(int, FILE *);
 * int      vfprintf(FILE *, const char *, va_list);
 *
 * functions for changing file position
 * --------------
 * int      fseek(FILE *, long int, int);                   DONE
 * int      fseeko(FILE *, off_t, int);
 * int      fsetpos(FILE *, const fpos_t *);
 * void     rewind(FILE *);
 * int      ungetc(int, FILE *);
 */

69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97
#define _XOPEN_SOURCE 500
#define _GNU_SOURCE

#include "darshan-runtime-config.h"
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdarg.h>
#include <string.h>
#include <time.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/uio.h>
#include <sys/mman.h>
#include <search.h>
#include <assert.h>
#include <libgen.h>
#include <pthread.h>

#include "uthash.h"
#include "utlist.h"

#include "darshan.h"
#include "darshan-dynamic.h"

DARSHAN_FORWARD_DECL(fopen, FILE*, (const char *path, const char *mode));
DARSHAN_FORWARD_DECL(fopen64, FILE*, (const char *path, const char *mode));
Philip Carns's avatar
Philip Carns committed
98
DARSHAN_FORWARD_DECL(fdopen, FILE*, (int fd, const char *mode));
Philip Carns's avatar
Philip Carns committed
99
DARSHAN_FORWARD_DECL(freopen, FILE*, (const char *path, const char *mode, FILE *stream));
100
DARSHAN_FORWARD_DECL(fclose, int, (FILE *fp));
Philip Carns's avatar
Philip Carns committed
101
DARSHAN_FORWARD_DECL(fflush, int, (FILE *fp));
102
DARSHAN_FORWARD_DECL(fwrite, size_t, (const void *ptr, size_t size, size_t nmemb, FILE *stream));
103
DARSHAN_FORWARD_DECL(fread, size_t, (void *ptr, size_t size, size_t nmemb, FILE *stream));
Philip Carns's avatar
Philip Carns committed
104
DARSHAN_FORWARD_DECL(fgetc, int, (FILE *stream));
Philip Carns's avatar
Philip Carns committed
105
DARSHAN_FORWARD_DECL(_IO_getc, int, (FILE *stream));
Philip Carns's avatar
Philip Carns committed
106 107
DARSHAN_FORWARD_DECL(fscanf, int, (FILE *stream, const char *format, ...));
DARSHAN_FORWARD_DECL(vfscanf, int, (FILE *stream, const char *format, va_list ap));
Philip Carns's avatar
Philip Carns committed
108
DARSHAN_FORWARD_DECL(fgets, char*, (char *s, int size, FILE *stream));
109
DARSHAN_FORWARD_DECL(fseek, int, (FILE *stream, long offset, int whence));
110 111

/* The stdio_file_runtime structure maintains necessary runtime metadata
112
 * for the STDIO file record (darshan_stdio_record structure, defined in
113 114 115 116 117 118 119 120
 * darshan-stdio-log-format.h) pointed to by 'file_record'. This metadata
 * assists with the instrumenting of specific statistics in the file record.
 * 'hlink' is a hash table link structure used to add/remove this record
 * from the hash table of STDIO file records for this process. 
 *
 * RATIONALE: the STDIO module needs to track some stateful, volatile 
 * information about each open file (like the current file offset, most recent 
 * access time, etc.) to aid in instrumentation, but this information can't be
121
 * stored in the darshan_stdio_record struct because we don't want it to appear in
122
 * the final darshan log file.  We therefore associate a stdio_file_runtime
123
 * struct with each darshan_stdio_record struct in order to track this information.
124 125
  *
 * NOTE: There is a one-to-one mapping of stdio_file_runtime structs to
126
 * darshan_stdio_record structs.
127
 *
128
 * NOTE: The stdio_file_runtime struct contains a pointer to a darshan_stdio_record
129
 * struct (see the *file_record member) rather than simply embedding an entire
130
 * darshan_stdio_record struct.  This is done so that all of the darshan_stdio_record
131 132 133 134 135
 * structs can be kept contiguous in memory as a single array to simplify
 * reduction, compression, and storage.
 */
struct stdio_file_runtime
{
136
    struct darshan_stdio_record* file_record;
137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180
    int64_t offset;
    double last_meta_end;
    double last_read_end;
    double last_write_end;
    UT_hash_handle hlink;
};

/* The stdio_file_runtime_ref structure is used to associate a STDIO
 * stream with an already existing STDIO file record. This is
 * necessary as many STDIO I/O functions take only an input stream,
 * but STDIO file records are indexed by their full file paths (i.e., darshan
 * record identifiers for STDIO files are created by hashing the file path).
 * In other words, this structure is necessary as it allows us to look up a
 * file record either by a pathname (stdio_file_runtime) or by STDIO stream 
 * (stdio_file_runtime_ref), depending on which parameters are
 * available. This structure includes another hash table link, since separate
 * hashes are maintained for stdio_file_runtime structures and stdio_file_runtime_ref
 * structures.
 *
 * RATIONALE: In theory the FILE* information could be included in the
 * stdio_file_runtime struct rather than in a separate structure here.  The
 * reason we don't do that is because the same file could be opened multiple
 * times by a given process with different stream pointers and thus
 * simulataneously referenced using different stream pointers.  This practice is
 * not common, but we must support it.
 *
 * NOTE: there are potentially multiple stdio_file_runtime_ref structures
 * referring to a single stdio_file_runtime structure.  Most of the time there is
 * only one, however.
 */
struct stdio_file_runtime_ref
{
    struct stdio_file_runtime* file;
    FILE* stream;
    UT_hash_handle hlink;
};

/* The stdio_runtime structure maintains necessary state for storing
 * STDIO file records and for coordinating with darshan-core at 
 * shutdown time.
 */
struct stdio_runtime
{
    struct stdio_file_runtime* file_runtime_array;
181
    struct darshan_stdio_record* file_record_array;
182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207
    int file_array_size;
    int file_array_ndx;
    struct stdio_file_runtime* file_hash;
    struct stdio_file_runtime_ref* stream_hash;
};

static struct stdio_runtime *stdio_runtime = NULL;
static pthread_mutex_t stdio_runtime_mutex = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
static int instrumentation_disabled = 0;
static int darshan_mem_alignment = 1;
static int my_rank = -1;

static void stdio_runtime_initialize(void);
static struct stdio_file_runtime* stdio_file_by_name(const char *name);
static struct stdio_file_runtime* stdio_file_by_name_setstream(const char* name, FILE *stream);
static struct stdio_file_runtime* stdio_file_by_stream(FILE* stream);
static void stdio_file_close_stream(FILE *stream);

static void stdio_begin_shutdown(void);
static void stdio_get_output_data(MPI_Comm mod_comm, darshan_record_id *shared_recs,
    int shared_rec_count, void **stdio_buf, int *stdio_buf_sz);
static void stdio_shutdown(void);

#define STDIO_LOCK() pthread_mutex_lock(&stdio_runtime_mutex)
#define STDIO_UNLOCK() pthread_mutex_unlock(&stdio_runtime_mutex)

Philip Carns's avatar
Philip Carns committed
208 209 210 211 212 213 214 215 216 217 218 219 220 221
#define STDIO_RECORD_OPEN(__ret, __path, __tm1, __tm2) do { \
    struct stdio_file_runtime* file; \
    char* exclude; \
    int tmp_index = 0; \
    if(__ret == NULL) break; \
    while((exclude = darshan_path_exclusions[tmp_index])) { \
        if(!(strncmp(exclude, __path, strlen(exclude)))) \
            break; \
        tmp_index++; \
    } \
    if(exclude) break; \
    file = stdio_file_by_name_setstream(__path, __ret); \
    if(!file) break; \
    file->offset = 0; \
222
    file->file_record->counters[STDIO_OPENS] += 1; \
Philip Carns's avatar
Philip Carns committed
223 224 225 226 227 228 229 230
    if(file->file_record->fcounters[STDIO_F_OPEN_START_TIMESTAMP] == 0 || \
     file->file_record->fcounters[STDIO_F_OPEN_START_TIMESTAMP] > __tm1) \
        file->file_record->fcounters[STDIO_F_OPEN_START_TIMESTAMP] = __tm1; \
    file->file_record->fcounters[STDIO_F_OPEN_END_TIMESTAMP] = __tm2; \
    DARSHAN_TIMER_INC_NO_OVERLAP(file->file_record->fcounters[STDIO_F_META_TIME], __tm1, __tm2, file->last_meta_end); \
} while(0)


231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248
#define STDIO_RECORD_READ(__fp, __bytes,  __tm1, __tm2) do{ \
    int64_t this_offset; \
    struct stdio_file_runtime* file; \
    file = stdio_file_by_stream(__fp); \
    if(!file) break; \
    this_offset = file->offset; \
    file->offset = this_offset + __bytes; \
    if(file->file_record->counters[STDIO_MAX_BYTE_READ] < (this_offset + __bytes - 1)) \
        file->file_record->counters[STDIO_MAX_BYTE_READ] = (this_offset + __bytes - 1); \
    file->file_record->counters[STDIO_BYTES_READ] += __bytes; \
    file->file_record->counters[STDIO_READS] += 1; \
    if(file->file_record->fcounters[STDIO_F_READ_START_TIMESTAMP] == 0 || \
     file->file_record->fcounters[STDIO_F_READ_START_TIMESTAMP] > __tm1) \
        file->file_record->fcounters[STDIO_F_READ_START_TIMESTAMP] = __tm1; \
    file->file_record->fcounters[STDIO_F_READ_END_TIMESTAMP] = __tm2; \
    DARSHAN_TIMER_INC_NO_OVERLAP(file->file_record->fcounters[STDIO_F_READ_TIME], __tm1, __tm2, file->last_write_end); \
} while(0)

Philip Carns's avatar
Philip Carns committed
249
#define STDIO_RECORD_WRITE(__fp, __bytes,  __tm1, __tm2, __fflush_flag) do{ \
250 251 252 253 254 255 256 257 258
    int64_t this_offset; \
    struct stdio_file_runtime* file; \
    file = stdio_file_by_stream(__fp); \
    if(!file) break; \
    this_offset = file->offset; \
    file->offset = this_offset + __bytes; \
    if(file->file_record->counters[STDIO_MAX_BYTE_WRITTEN] < (this_offset + __bytes - 1)) \
        file->file_record->counters[STDIO_MAX_BYTE_WRITTEN] = (this_offset + __bytes - 1); \
    file->file_record->counters[STDIO_BYTES_WRITTEN] += __bytes; \
Philip Carns's avatar
Philip Carns committed
259 260 261 262
    if(__fflush_flag) \
        file->file_record->counters[STDIO_FLUSHES] += 1; \
    else \
        file->file_record->counters[STDIO_WRITES] += 1; \
263 264 265 266 267 268
    if(file->file_record->fcounters[STDIO_F_WRITE_START_TIMESTAMP] == 0 || \
     file->file_record->fcounters[STDIO_F_WRITE_START_TIMESTAMP] > __tm1) \
        file->file_record->fcounters[STDIO_F_WRITE_START_TIMESTAMP] = __tm1; \
    file->file_record->fcounters[STDIO_F_WRITE_END_TIMESTAMP] = __tm2; \
    DARSHAN_TIMER_INC_NO_OVERLAP(file->file_record->fcounters[STDIO_F_WRITE_TIME], __tm1, __tm2, file->last_write_end); \
} while(0)
Philip Carns's avatar
Philip Carns committed
269

Philip Carns's avatar
Philip Carns committed
270
FILE* DARSHAN_DECL(fopen)(const char *path, const char *mode)
Philip Carns's avatar
Philip Carns committed
271 272 273 274
{
    FILE* ret;
    double tm1, tm2;

Philip Carns's avatar
Philip Carns committed
275
    MAP_OR_FAIL(fopen);
Philip Carns's avatar
Philip Carns committed
276 277

    tm1 = darshan_core_wtime();
Philip Carns's avatar
Philip Carns committed
278
    ret = __real_fopen(path, mode);
Philip Carns's avatar
Philip Carns committed
279 280 281 282
    tm2 = darshan_core_wtime();

    STDIO_LOCK();
    stdio_runtime_initialize();
Philip Carns's avatar
Philip Carns committed
283
    STDIO_RECORD_OPEN(ret, path, tm1, tm2);
Philip Carns's avatar
Philip Carns committed
284 285 286 287 288
    STDIO_UNLOCK();

    return(ret);
}

Philip Carns's avatar
Philip Carns committed
289
FILE* DARSHAN_DECL(fopen64)(const char *path, const char *mode)
290 291
{
    FILE* ret;
Philip Carns's avatar
Philip Carns committed
292
    double tm1, tm2;
293 294 295

    MAP_OR_FAIL(fopen);

Philip Carns's avatar
Philip Carns committed
296
    tm1 = darshan_core_wtime();
Philip Carns's avatar
Philip Carns committed
297
    ret = __real_fopen64(path, mode);
Philip Carns's avatar
Philip Carns committed
298 299 300 301 302 303
    tm2 = darshan_core_wtime();

    STDIO_LOCK();
    stdio_runtime_initialize();
    STDIO_RECORD_OPEN(ret, path, tm1, tm2);
    STDIO_UNLOCK();
304 305 306 307

    return(ret);
}

Philip Carns's avatar
Philip Carns committed
308
FILE* DARSHAN_DECL(fdopen)(int fd, const char *mode)
309 310
{
    FILE* ret;
Philip Carns's avatar
Philip Carns committed
311
    double tm1, tm2;
312

Philip Carns's avatar
Philip Carns committed
313
    MAP_OR_FAIL(fdopen);
314

Philip Carns's avatar
Philip Carns committed
315
    tm1 = darshan_core_wtime();
Philip Carns's avatar
Philip Carns committed
316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335
    ret = __real_fdopen(fd, mode);
    tm2 = darshan_core_wtime();

    STDIO_LOCK();
    stdio_runtime_initialize();
    STDIO_RECORD_OPEN(ret, "UNKNOWN-FDOPEN", tm1, tm2);
    STDIO_UNLOCK();

    return(ret);
}

FILE* DARSHAN_DECL(freopen)(const char *path, const char *mode, FILE *stream)
{
    FILE* ret;
    double tm1, tm2;

    MAP_OR_FAIL(freopen);

    tm1 = darshan_core_wtime();
    ret = __real_freopen(path, mode, stream);
Philip Carns's avatar
Philip Carns committed
336 337 338 339 340 341
    tm2 = darshan_core_wtime();

    STDIO_LOCK();
    stdio_runtime_initialize();
    STDIO_RECORD_OPEN(ret, path, tm1, tm2);
    STDIO_UNLOCK();
342 343 344 345

    return(ret);
}

Philip Carns's avatar
Philip Carns committed
346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365
int DARSHAN_DECL(fflush)(FILE *fp)
{
    double tm1, tm2;
    int ret;

    MAP_OR_FAIL(fflush);

    tm1 = darshan_core_wtime();
    ret = __real_fflush(fp);
    tm2 = darshan_core_wtime();

    STDIO_LOCK();
    stdio_runtime_initialize();
    if(ret >= 0)
        STDIO_RECORD_WRITE(fp, 0, tm1, tm2, 1);
    STDIO_UNLOCK();

    return(ret);
}

366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396
int DARSHAN_DECL(fclose)(FILE *fp)
{
    struct stdio_file_runtime* file;
    double tm1, tm2;
    int ret;

    MAP_OR_FAIL(fclose);

    tm1 = darshan_core_wtime();
    ret = __real_fclose(fp);
    tm2 = darshan_core_wtime();

    STDIO_LOCK();
    stdio_runtime_initialize();
    file = stdio_file_by_stream(fp);
    if(file)
    {
        if(file->file_record->fcounters[STDIO_F_CLOSE_START_TIMESTAMP] == 0 ||
         file->file_record->fcounters[STDIO_F_CLOSE_START_TIMESTAMP] > tm1)
           file->file_record->fcounters[STDIO_F_CLOSE_START_TIMESTAMP] = tm1;
        file->file_record->fcounters[STDIO_F_CLOSE_END_TIMESTAMP] = tm2;
        DARSHAN_TIMER_INC_NO_OVERLAP(
            file->file_record->fcounters[STDIO_F_META_TIME],
            tm1, tm2, file->last_meta_end);
        stdio_file_close_stream(fp);
    }
    STDIO_UNLOCK();

    return(ret);
}

397 398 399 400 401 402 403 404 405 406 407 408 409 410
size_t DARSHAN_DECL(fwrite)(const void *ptr, size_t size, size_t nmemb, FILE *stream)
{
    size_t ret;
    double tm1, tm2;

    MAP_OR_FAIL(fwrite);

    tm1 = darshan_core_wtime();
    ret = __real_fwrite(ptr, size, nmemb, stream);
    tm2 = darshan_core_wtime();

    STDIO_LOCK();
    stdio_runtime_initialize();
    if(ret > 0)
Philip Carns's avatar
Philip Carns committed
411
        STDIO_RECORD_WRITE(stream, size*ret, tm1, tm2, 0);
412 413 414 415 416
    STDIO_UNLOCK();

    return(ret);
}

417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436
size_t DARSHAN_DECL(fread)(void *ptr, size_t size, size_t nmemb, FILE *stream)
{
    size_t ret;
    double tm1, tm2;

    MAP_OR_FAIL(fread);

    tm1 = darshan_core_wtime();
    ret = __real_fread(ptr, size, nmemb, stream);
    tm2 = darshan_core_wtime();

    STDIO_LOCK();
    stdio_runtime_initialize();
    if(ret > 0)
        STDIO_RECORD_READ(stream, size*ret, tm1, tm2);
    STDIO_UNLOCK();

    return(ret);
}

Philip Carns's avatar
Philip Carns committed
437 438 439 440 441 442 443 444 445 446 447 448 449
size_t DARSHAN_DECL(fgetc)(FILE *stream)
{
    int ret;
    double tm1, tm2;

    MAP_OR_FAIL(fgetc);

    tm1 = darshan_core_wtime();
    ret = __real_fgetc(stream);
    tm2 = darshan_core_wtime();

    STDIO_LOCK();
    stdio_runtime_initialize();
Philip Carns's avatar
Philip Carns committed
450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470
    if(ret != EOF)
        STDIO_RECORD_READ(stream, 1, tm1, tm2);
    STDIO_UNLOCK();

    return(ret);
}

/* NOTE: stdio.h typically implements getc() as a macro pointing to _IO_getc */
size_t DARSHAN_DECL(_IO_getc)(FILE *stream)
{
    int ret;
    double tm1, tm2;

    MAP_OR_FAIL(_IO_getc);

    tm1 = darshan_core_wtime();
    ret = __real__IO_getc(stream);
    tm2 = darshan_core_wtime();

    STDIO_LOCK();
    stdio_runtime_initialize();
Philip Carns's avatar
Philip Carns committed
471 472 473 474 475 476 477
    if(ret != EOF)
        STDIO_RECORD_READ(stream, 1, tm1, tm2);
    STDIO_UNLOCK();

    return(ret);
}

Philip Carns's avatar
Philip Carns committed
478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530
int DARSHAN_DECL(fscanf)(FILE *stream, const char *format, ...)
{
    int ret;
    double tm1, tm2;
    va_list ap;
    long start_off, end_off;

    MAP_OR_FAIL(vfscanf);

    tm1 = darshan_core_wtime();
    /* NOTE: we intentionally switch to vfscanf here to handle the variable
     * length arguments.
     */
    start_off = ftell(stream);
    va_start(ap, format);
    ret = __real_vfscanf(stream, format, ap);
    va_end(ap);
    end_off = ftell(stream);
    tm2 = darshan_core_wtime();

    STDIO_LOCK();
    stdio_runtime_initialize();
    if(ret != 0)
        STDIO_RECORD_READ(stream, end_off-start_off, tm1, tm2);
    STDIO_UNLOCK();

    return(ret);
}

int DARSHAN_DECL(vfscanf)(FILE *stream, const char *format, va_list ap)
{
    int ret;
    double tm1, tm2;
    long start_off, end_off;

    MAP_OR_FAIL(vfscanf);

    tm1 = darshan_core_wtime();
    start_off = ftell(stream);
    ret = __real_vfscanf(stream, format, ap);
    end_off = ftell(stream);
    tm2 = darshan_core_wtime();

    STDIO_LOCK();
    stdio_runtime_initialize();
    if(ret != 0)
        STDIO_RECORD_READ(stream, end_off-start_off, tm1, tm2);
    STDIO_UNLOCK();

    return(ret);
}


Philip Carns's avatar
Philip Carns committed
531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551
char* DARSHAN_DECL(fgets)(char *s, int size, FILE *stream)
{
    char *ret;
    double tm1, tm2;

    MAP_OR_FAIL(fgets);

    tm1 = darshan_core_wtime();
    ret = __real_fgets(s, size, stream);
    tm2 = darshan_core_wtime();

    STDIO_LOCK();
    stdio_runtime_initialize();
    if(ret != NULL)
        STDIO_RECORD_READ(stream, strlen(ret), tm1, tm2);
    STDIO_UNLOCK();

    return(ret);
}


552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582
int DARSHAN_DECL(fseek)(FILE *stream, long offset, int whence)
{
    int ret;
    struct stdio_file_runtime* file;
    double tm1, tm2;

    MAP_OR_FAIL(fseek);

    tm1 = darshan_core_wtime();
    ret = __real_fseek(stream, offset, whence);
    tm2 = darshan_core_wtime();

    if(ret >= 0)
    {
        STDIO_LOCK();
        stdio_runtime_initialize();
        file = stdio_file_by_stream(stream);
        if(file)
        {
            file->offset = ftell(stream);
            DARSHAN_TIMER_INC_NO_OVERLAP(
                file->file_record->fcounters[STDIO_F_META_TIME],
                tm1, tm2, file->last_meta_end);
            file->file_record->counters[STDIO_SEEKS] += 1;
        }
        STDIO_UNLOCK();
    }

    return(ret);
}

583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621
/**********************************************************
 * Internal functions for manipulating STDIO module state *
 **********************************************************/

/* initialize internal STDIO module data structures and register with darshan-core */
static void stdio_runtime_initialize()
{
    int mem_limit;
    struct darshan_module_funcs stdio_mod_fns =
    {
        .begin_shutdown = &stdio_begin_shutdown,
        .get_output_data = &stdio_get_output_data,
        .shutdown = &stdio_shutdown
    };

    /* don't do anything if already initialized or instrumenation is disabled */
    if(stdio_runtime || instrumentation_disabled)
        return;

    /* register the stdio module with darshan core */
    darshan_core_register_module(
        DARSHAN_STDIO_MOD,
        &stdio_mod_fns,
        &my_rank,
        &mem_limit,
        &darshan_mem_alignment);

    /* return if no memory assigned by darshan core */
    if(mem_limit == 0)
        return;

    stdio_runtime = malloc(sizeof(*stdio_runtime));
    if(!stdio_runtime)
        return;
    memset(stdio_runtime, 0, sizeof(*stdio_runtime));

    /* set maximum number of file records according to max memory limit */
    /* NOTE: maximum number of records is based on the size of a stdio file record */
    /* TODO: should we base memory usage off file record or total runtime structure sizes? */
622
    stdio_runtime->file_array_size = mem_limit / sizeof(struct darshan_stdio_record);
623 624 625 626 627 628
    stdio_runtime->file_array_ndx = 0;

    /* allocate array of runtime file records */
    stdio_runtime->file_runtime_array = malloc(stdio_runtime->file_array_size *
                                               sizeof(struct stdio_file_runtime));
    stdio_runtime->file_record_array = malloc(stdio_runtime->file_array_size *
629
                                              sizeof(struct darshan_stdio_record));
630 631 632 633 634 635 636 637
    if(!stdio_runtime->file_runtime_array || !stdio_runtime->file_record_array)
    {
        stdio_runtime->file_array_size = 0;
        return;
    }
    memset(stdio_runtime->file_runtime_array, 0, stdio_runtime->file_array_size *
           sizeof(struct stdio_file_runtime));
    memset(stdio_runtime->file_record_array, 0, stdio_runtime->file_array_size *
638
           sizeof(struct darshan_stdio_record));
639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809

    return;
}

/* get a STDIO file record for the given file path */
static struct stdio_file_runtime* stdio_file_by_name(const char *name)
{
    struct stdio_file_runtime *file = NULL;
    char *newname = NULL;
    darshan_record_id file_id;
    int file_alignment;
    int limit_flag;

    if(!stdio_runtime || instrumentation_disabled)
        return(NULL);

    newname = darshan_clean_file_path(name);
    if(!newname)
        newname = (char*)name;

    limit_flag = (stdio_runtime->file_array_ndx >= stdio_runtime->file_array_size);

    /* get a unique id for this file from darshan core */
    darshan_core_register_record(
        (void*)newname,
        strlen(newname),
        DARSHAN_STDIO_MOD,
        1,
        limit_flag,
        &file_id,
        &file_alignment);

    /* the file record id is set to 0 if no memory is available for tracking
     * new records -- just fall through and ignore this record
     */
    if(file_id == 0)
    {
        if(newname != name)
            free(newname);
        return(NULL);
    }

    /* search the hash table for this file record, and return if found */
    HASH_FIND(hlink, stdio_runtime->file_hash, &file_id, sizeof(darshan_record_id), file);
    if(file)
    {
        if(newname != name)
            free(newname);
        return(file);
    }

    /* no existing record, assign a new file record from the global array */
    file = &(stdio_runtime->file_runtime_array[stdio_runtime->file_array_ndx]);
    file->file_record = &(stdio_runtime->file_record_array[stdio_runtime->file_array_ndx]);
    file->file_record->f_id = file_id;
    file->file_record->rank = my_rank;

    /* add new record to file hash table */
    HASH_ADD(hlink, stdio_runtime->file_hash, file_record->f_id, sizeof(darshan_record_id), file);
    stdio_runtime->file_array_ndx++;

    if(newname != name)
        free(newname);
    return(file);
}

/* get a STDIO file record for the given file path, and also create a
 * reference structure using the returned stream
 */
static struct stdio_file_runtime* stdio_file_by_name_setstream(const char* name, FILE *stream)
{
    struct stdio_file_runtime* file;
    struct stdio_file_runtime_ref* ref;

    if(!stdio_runtime || instrumentation_disabled)
        return(NULL);

    /* find file record by name first */
    file = stdio_file_by_name(name);

    if(!file)
        return(NULL);

    /* search hash table for existing file ref for this stream */
    HASH_FIND(hlink, stdio_runtime->stream_hash, &stream, sizeof(FILE*), ref);
    if(ref)
    {
        /* we have a reference.  Make sure it points to the correct file
         * and return it
         */
        ref->file = file;
        return(file);
    }

    /* if we hit this point, then we don't have a reference for this stream 
     * in the table yet.  Add it.
     */
    ref = malloc(sizeof(*ref));
    if(!ref)
        return(NULL);
    memset(ref, 0, sizeof(*ref));

    ref->file = file;
    ref->stream = stream;    
    HASH_ADD(hlink, stdio_runtime->stream_hash, stream, sizeof(FILE*), ref);

    return(file);
}

/* get a STDIO file record for the given stream */
static struct stdio_file_runtime* stdio_file_by_stream(FILE *stream)
{
    struct stdio_file_runtime_ref* ref;

    if(!stdio_runtime || instrumentation_disabled)
        return(NULL);

    /* search hash table for existing file ref for this stream */
    HASH_FIND(hlink, stdio_runtime->stream_hash, &stream, sizeof(FILE*), ref);
    if(ref)
        return(ref->file);

    return(NULL);
}

/* free up reference data structures for the given stream */
static void stdio_file_close_stream(FILE *stream)
{
    struct stdio_file_runtime_ref* ref;

    if(!stdio_runtime || instrumentation_disabled)
        return;

    /* search hash table for this stream */
    HASH_FIND(hlink, stdio_runtime->stream_hash, &stream, sizeof(FILE*), ref);
    if(ref)
    {
        /* we have a reference, delete it */
        HASH_DELETE(hlink, stdio_runtime->stream_hash, ref);
        free(ref);
    }

    return;
}

/************************************************************************
 * Functions exported by this module for coordinating with darshan-core *
 ************************************************************************/

static void stdio_begin_shutdown()
{
    assert(stdio_runtime);

    STDIO_LOCK();
    /* disable further instrumentation while Darshan shuts down */
    instrumentation_disabled = 1;
    STDIO_UNLOCK();

    return;
}

static void stdio_get_output_data(
    MPI_Comm mod_comm,
    darshan_record_id *shared_recs,
    int shared_rec_count,
    void **stdio_buf,
    int *stdio_buf_sz)
{
    assert(stdio_runtime);

    *stdio_buf = (void *)(stdio_runtime->file_record_array);
810
    *stdio_buf_sz = stdio_runtime->file_array_ndx * sizeof(struct darshan_stdio_record);
811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845

    return;
}

static void stdio_shutdown()
{
    struct stdio_file_runtime_ref *ref, *tmp;

    assert(stdio_runtime);

    HASH_ITER(hlink, stdio_runtime->stream_hash, ref, tmp)
    {
        HASH_DELETE(hlink, stdio_runtime->stream_hash, ref);
        free(ref);
    }

    HASH_CLEAR(hlink, stdio_runtime->file_hash); /* these entries are freed all at once below */

    free(stdio_runtime->file_runtime_array);
    free(stdio_runtime->file_record_array);
    free(stdio_runtime);
    stdio_runtime = NULL;
    instrumentation_disabled = 0;
    
    return;
}

/*
 * Local variables:
 *  c-indent-level: 4
 *  c-basic-offset: 4
 * End:
 *
 * vim: ts=8 sts=4 sw=4 expandtab
 */