tools/perf/util/probe-event.c

   1 /*
   2  * probe-event.c : perf-probe definition to kprobe_events format converter
   3  *
   4  * Written by Masami Hiramatsu <mhiramat@redhat.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  *
  20  */
  21
  22 #define _GNU_SOURCE
  23 #include <sys/utsname.h>
  24 #include <sys/types.h>
  25 #include <sys/stat.h>
  26 #include <fcntl.h>
  27 #include <errno.h>
  28 #include <stdio.h>
  29 #include <unistd.h>
  30 #include <stdlib.h>
  31 #include <string.h>
  32 #include <stdarg.h>
  33 #include <limits.h>
  34
  35 #undef _GNU_SOURCE
  36 #include "event.h"
  37 #include "string.h"
  38 #include "strlist.h"
  39 #include "debug.h"
  40 #include "cache.h"
  41 #include "color.h"
  42 #include "parse-events.h"  /* For debugfs_path */
  43 #include "probe-event.h"
  44
  45 #define MAX_CMDLEN 256
  46 #define MAX_PROBE_ARGS 128
  47 #define PERFPROBE_GROUP "probe"
  48
  49 #define semantic_error(msg ...) die("Semantic error :" msg)
  50
  51 /* If there is no space to write, returns -E2BIG. */
  52 static int e_snprintf(char *str, size_t size, const char *format, ...)
  53         __attribute__((format(printf, 3, 4)));
  54
  55 static int e_snprintf(char *str, size_t size, const char *format, ...)
  56 {
  57         int ret;
  58         va_list ap;
  59         va_start(ap, format);
  60         ret = vsnprintf(str, size, format, ap);
  61         va_end(ap);
  62         if (ret >= (int)size)
  63                 ret = -E2BIG;
  64         return ret;
  65 }
  66
  67 void parse_line_range_desc(const char *arg, struct line_range *lr)
  68 {
  69         const char *ptr;
  70         char *tmp;
  71         /*
  72          * <Syntax>
  73          * SRC:SLN[+NUM|-ELN]
  74          * FUNC[:SLN[+NUM|-ELN]]
  75          */
  76         ptr = strchr(arg, ':');
  77         if (ptr) {
  78                 lr->start = (unsigned int)strtoul(ptr + 1, &tmp, 0);
  79                 if (*tmp == '+')
  80                         lr->end = lr->start + (unsigned int)strtoul(tmp + 1,
  81                                                                     &tmp, 0);
  82                 else if (*tmp == '-')
  83                         lr->end = (unsigned int)strtoul(tmp + 1, &tmp, 0);
  84                 else
  85                         lr->end = 0;
  86                 pr_debug("Line range is %u to %u\n", lr->start, lr->end);
  87                 if (lr->end && lr->start > lr->end)
  88                         semantic_error("Start line must be smaller"
  89                                        " than end line.");
  90                 if (*tmp != '\0')
  91                         semantic_error("Tailing with invalid character '%d'.",
  92                                        *tmp);
  93                 tmp = strndup(arg, (ptr - arg));
  94         } else
  95                 tmp = strdup(arg);
  96
  97         if (strchr(tmp, '.'))
  98                 lr->file = tmp;
  99         else
 100                 lr->function = tmp;
 101 }
 102
 103 /* Check the name is good for event/group */
 104 static bool check_event_name(const char *name)
 105 {
 106         if (!isalpha(*name) && *name != '_')
 107                 return false;
 108         while (*++name != '\0') {
 109                 if (!isalpha(*name) && !isdigit(*name) && *name != '_')
 110                         return false;
 111         }
 112         return true;
 113 }
 114
 115 /* Parse probepoint definition. */
 116 static void parse_perf_probe_probepoint(char *arg, struct probe_point *pp)
 117 {
 118         char *ptr, *tmp;
 119         char c, nc = 0;
 120         /*
 121          * <Syntax>
 122          * perf probe [EVENT=]SRC[:LN|;PTN]
 123          * perf probe [EVENT=]FUNC[@SRC][+OFFS|%return|:LN|;PAT]
 124          *
 125          * TODO:Group name support
 126          */
 127
 128         ptr = strpbrk(arg, ";=@+%");
 129         if (ptr && *ptr == '=') {       /* Event name */
 130                 *ptr = '\0';
 131                 tmp = ptr + 1;
 132                 ptr = strchr(arg, ':');
 133                 if (ptr)        /* Group name is not supported yet. */
 134                         semantic_error("Group name is not supported yet.");
 135                 if (!check_event_name(arg))
 136                         semantic_error("%s is bad for event name -it must "
 137                                        "follow C symbol-naming rule.", arg);
 138                 pp->event = strdup(arg);
 139                 arg = tmp;
 140         }
 141
 142         ptr = strpbrk(arg, ";:+@%");
 143         if (ptr) {
 144                 nc = *ptr;
 145                 *ptr++ = '\0';
 146         }
 147
 148         /* Check arg is function or file and copy it */
 149         if (strchr(arg, '.'))   /* File */
 150                 pp->file = strdup(arg);
 151         else                    /* Function */
 152                 pp->function = strdup(arg);
 153         DIE_IF(pp->file == NULL && pp->function == NULL);
 154
 155         /* Parse other options */
 156         while (ptr) {
 157                 arg = ptr;
 158                 c = nc;
 159                 if (c == ';') { /* Lazy pattern must be the last part */
 160                         pp->lazy_line = strdup(arg);
 161                         break;
 162                 }
 163                 ptr = strpbrk(arg, ";:+@%");
 164                 if (ptr) {
 165                         nc = *ptr;
 166                         *ptr++ = '\0';
 167                 }
 168                 switch (c) {
 169                 case ':':       /* Line number */
 170                         pp->line = strtoul(arg, &tmp, 0);
 171                         if (*tmp != '\0')
 172                                 semantic_error("There is non-digit char"
 173                                                " in line number.");
 174                         break;
 175                 case '+':       /* Byte offset from a symbol */
 176                         pp->offset = strtoul(arg, &tmp, 0);
 177                         if (*tmp != '\0')
 178                                 semantic_error("There is non-digit character"
 179                                                 " in offset.");
 180                         break;
 181                 case '@':       /* File name */
 182                         if (pp->file)
 183                                 semantic_error("SRC@SRC is not allowed.");
 184                         pp->file = strdup(arg);
 185                         DIE_IF(pp->file == NULL);
 186                         break;
 187                 case '%':       /* Probe places */
 188                         if (strcmp(arg, "return") == 0) {
 189                                 pp->retprobe = 1;
 190                         } else  /* Others not supported yet */
 191                                 semantic_error("%%%s is not supported.", arg);
 192                         break;
 193                 default:
 194                         DIE_IF("Program has a bug.");
 195                         break;
 196                 }
 197         }
 198
 199         /* Exclusion check */
 200         if (pp->lazy_line && pp->line)
 201                 semantic_error("Lazy pattern can't be used with line number.");
 202
 203         if (pp->lazy_line && pp->offset)
 204                 semantic_error("Lazy pattern can't be used with offset.");
 205
 206         if (pp->line && pp->offset)
 207                 semantic_error("Offset can't be used with line number.");
 208
 209         if (!pp->line && !pp->lazy_line && pp->file && !pp->function)
 210                 semantic_error("File always requires line number or "
 211                                "lazy pattern.");
 212
 213         if (pp->offset && !pp->function)
 214                 semantic_error("Offset requires an entry function.");
 215
 216         if (pp->retprobe && !pp->function)
 217                 semantic_error("Return probe requires an entry function.");
 218
 219         if ((pp->offset || pp->line || pp->lazy_line) && pp->retprobe)
 220                 semantic_error("Offset/Line/Lazy pattern can't be used with "
 221                                "return probe.");
 222
 223         pr_debug("symbol:%s file:%s line:%d offset:%d return:%d lazy:%s\n",
 224                  pp->function, pp->file, pp->line, pp->offset, pp->retprobe,
 225                  pp->lazy_line);
 226 }
 227
 228 /* Parse perf-probe event definition */
 229 void parse_perf_probe_event(const char *str, struct probe_point *pp,
 230                             bool *need_dwarf)
 231 {
 232         char **argv;
 233         int argc, i;
 234
 235         *need_dwarf = false;
 236
 237         argv = argv_split(str, &argc);
 238         if (!argv)
 239                 die("argv_split failed.");
 240         if (argc > MAX_PROBE_ARGS + 1)
 241                 semantic_error("Too many arguments");
 242
 243         /* Parse probe point */
 244         parse_perf_probe_probepoint(argv[0], pp);
 245         if (pp->file || pp->line)
 246                 *need_dwarf = true;
 247
 248         /* Copy arguments and ensure return probe has no C argument */
 249         pp->nr_args = argc - 1;
 250         pp->args = zalloc(sizeof(char *) * pp->nr_args);
 251         for (i = 0; i < pp->nr_args; i++) {
 252                 pp->args[i] = strdup(argv[i + 1]);
 253                 if (!pp->args[i])
 254                         die("Failed to copy argument.");
 255                 if (is_c_varname(pp->args[i])) {
 256                         if (pp->retprobe)
 257                                 semantic_error("You can't specify local"
 258                                                 " variable for kretprobe");
 259                         *need_dwarf = true;
 260                 }
 261         }
 262
 263         argv_free(argv);
 264 }
 265
 266 /* Parse kprobe_events event into struct probe_point */
 267 void parse_trace_kprobe_event(const char *str, struct probe_point *pp)
 268 {
 269         char pr;
 270         char *p;
 271         int ret, i, argc;
 272         char **argv;
 273
 274         pr_debug("Parsing kprobe_events: %s\n", str);
 275         argv = argv_split(str, &argc);
 276         if (!argv)
 277                 die("argv_split failed.");
 278         if (argc < 2)
 279                 semantic_error("Too less arguments.");
 280
 281         /* Scan event and group name. */
 282         ret = sscanf(argv[0], "%c:%a[^/ \t]/%a[^ \t]",
 283                      &pr, (float *)(void *)&pp->group,
 284                      (float *)(void *)&pp->event);
 285         if (ret != 3)
 286                 semantic_error("Failed to parse event name: %s", argv[0]);
 287         pr_debug("Group:%s Event:%s probe:%c\n", pp->group, pp->event, pr);
 288
 289         pp->retprobe = (pr == 'r');
 290
 291         /* Scan function name and offset */
 292         ret = sscanf(argv[1], "%a[^+]+%d", (float *)(void *)&pp->function,
 293                      &pp->offset);
 294         if (ret == 1)
 295                 pp->offset = 0;
 296
 297         /* kprobe_events doesn't have this information */
 298         pp->line = 0;
 299         pp->file = NULL;
 300
 301         pp->nr_args = argc - 2;
 302         pp->args = zalloc(sizeof(char *) * pp->nr_args);
 303         for (i = 0; i < pp->nr_args; i++) {
 304                 p = strchr(argv[i + 2], '=');
 305                 if (p)  /* We don't need which register is assigned. */
 306                         *p = '\0';
 307                 pp->args[i] = strdup(argv[i + 2]);
 308                 if (!pp->args[i])
 309                         die("Failed to copy argument.");
 310         }
 311
 312         argv_free(argv);
 313 }
 314
 315 /* Synthesize only probe point (not argument) */
 316 int synthesize_perf_probe_point(struct probe_point *pp)
 317 {
 318         char *buf;
 319         char offs[64] = "", line[64] = "";
 320         int ret;
 321
 322         pp->probes[0] = buf = zalloc(MAX_CMDLEN);
 323         pp->found = 1;
 324         if (!buf)
 325                 die("Failed to allocate memory by zalloc.");
 326         if (pp->offset) {
 327                 ret = e_snprintf(offs, 64, "+%d", pp->offset);
 328                 if (ret <= 0)
 329                         goto error;
 330         }
 331         if (pp->line) {
 332                 ret = e_snprintf(line, 64, ":%d", pp->line);
 333                 if (ret <= 0)
 334                         goto error;
 335         }
 336
 337         if (pp->function)
 338                 ret = e_snprintf(buf, MAX_CMDLEN, "%s%s%s%s", pp->function,
 339                                  offs, pp->retprobe ? "%return" : "", line);
 340         else
 341                 ret = e_snprintf(buf, MAX_CMDLEN, "%s%s", pp->file, line);
 342         if (ret <= 0) {
 343 error:
 344                 free(pp->probes[0]);
 345                 pp->probes[0] = NULL;
 346                 pp->found = 0;
 347         }
 348         return ret;
 349 }
 350
 351 int synthesize_perf_probe_event(struct probe_point *pp)
 352 {
 353         char *buf;
 354         int i, len, ret;
 355
 356         len = synthesize_perf_probe_point(pp);
 357         if (len < 0)
 358                 return 0;
 359
 360         buf = pp->probes[0];
 361         for (i = 0; i < pp->nr_args; i++) {
 362                 ret = e_snprintf(&buf[len], MAX_CMDLEN - len, " %s",
 363                                  pp->args[i]);
 364                 if (ret <= 0)
 365                         goto error;
 366                 len += ret;
 367         }
 368         pp->found = 1;
 369
 370         return pp->found;
 371 error:
 372         free(pp->probes[0]);
 373         pp->probes[0] = NULL;
 374
 375         return ret;
 376 }
 377
 378 int synthesize_trace_kprobe_event(struct probe_point *pp)
 379 {
 380         char *buf;
 381         int i, len, ret;
 382
 383         pp->probes[0] = buf = zalloc(MAX_CMDLEN);
 384         if (!buf)
 385                 die("Failed to allocate memory by zalloc.");
 386         ret = e_snprintf(buf, MAX_CMDLEN, "%s+%d", pp->function, pp->offset);
 387         if (ret <= 0)
 388                 goto error;
 389         len = ret;
 390
 391         for (i = 0; i < pp->nr_args; i++) {
 392                 ret = e_snprintf(&buf[len], MAX_CMDLEN - len, " %s",
 393                                  pp->args[i]);
 394                 if (ret <= 0)
 395                         goto error;
 396                 len += ret;
 397         }
 398         pp->found = 1;
 399
 400         return pp->found;
 401 error:
 402         free(pp->probes[0]);
 403         pp->probes[0] = NULL;
 404
 405         return ret;
 406 }
 407
 408 static int open_kprobe_events(int flags, int mode)
 409 {
 410         char buf[PATH_MAX];
 411         int ret;
 412
 413         ret = e_snprintf(buf, PATH_MAX, "%s/../kprobe_events", debugfs_path);
 414         if (ret < 0)
 415                 die("Failed to make kprobe_events path.");
 416
 417         ret = open(buf, flags, mode);
 418         if (ret < 0) {
 419                 if (errno == ENOENT)
 420                         die("kprobe_events file does not exist -"
 421                             " please rebuild with CONFIG_KPROBE_EVENT.");
 422                 else
 423                         die("Could not open kprobe_events file: %s",
 424                             strerror(errno));
 425         }
 426         return ret;
 427 }
 428
 429 /* Get raw string list of current kprobe_events */
 430 static struct strlist *get_trace_kprobe_event_rawlist(int fd)
 431 {
 432         int ret, idx;
 433         FILE *fp;
 434         char buf[MAX_CMDLEN];
 435         char *p;
 436         struct strlist *sl;
 437
 438         sl = strlist__new(true, NULL);
 439
 440         fp = fdopen(dup(fd), "r");
 441         while (!feof(fp)) {
 442                 p = fgets(buf, MAX_CMDLEN, fp);
 443                 if (!p)
 444                         break;
 445
 446                 idx = strlen(p) - 1;
 447                 if (p[idx] == '\n')
 448                         p[idx] = '\0';
 449                 ret = strlist__add(sl, buf);
 450                 if (ret < 0)
 451                         die("strlist__add failed: %s", strerror(-ret));
 452         }
 453         fclose(fp);
 454
 455         return sl;
 456 }
 457
 458 /* Free and zero clear probe_point */
 459 static void clear_probe_point(struct probe_point *pp)
 460 {
 461         int i;
 462
 463         if (pp->event)
 464                 free(pp->event);
 465         if (pp->group)
 466                 free(pp->group);
 467         if (pp->function)
 468                 free(pp->function);
 469         if (pp->file)
 470                 free(pp->file);
 471         if (pp->lazy_line)
 472                 free(pp->lazy_line);
 473         for (i = 0; i < pp->nr_args; i++)
 474                 free(pp->args[i]);
 475         if (pp->args)
 476                 free(pp->args);
 477         for (i = 0; i < pp->found; i++)
 478                 free(pp->probes[i]);
 479         memset(pp, 0, sizeof(*pp));
 480 }
 481
 482 /* Show an event */
 483 static void show_perf_probe_event(const char *event, const char *place,
 484                                   struct probe_point *pp)
 485 {
 486         int i, ret;
 487         char buf[128];
 488
 489         ret = e_snprintf(buf, 128, "%s:%s", pp->group, event);
 490         if (ret < 0)
 491                 die("Failed to copy event: %s", strerror(-ret));
 492         printf("  %-40s (on %s", buf, place);
 493
 494         if (pp->nr_args > 0) {
 495                 printf(" with");
 496                 for (i = 0; i < pp->nr_args; i++)
 497                         printf(" %s", pp->args[i]);
 498         }
 499         printf(")\n");
 500 }
 501
 502 /* List up current perf-probe events */
 503 void show_perf_probe_events(void)
 504 {
 505         int fd;
 506         struct probe_point pp;
 507         struct strlist *rawlist;
 508         struct str_node *ent;
 509
 510         setup_pager();
 511
 512         memset(&pp, 0, sizeof(pp));
 513         fd = open_kprobe_events(O_RDONLY, 0);
 514         rawlist = get_trace_kprobe_event_rawlist(fd);
 515         close(fd);
 516
 517         strlist__for_each(ent, rawlist) {
 518                 parse_trace_kprobe_event(ent->s, &pp);
 519                 /* Synthesize only event probe point */
 520                 synthesize_perf_probe_point(&pp);
 521                 /* Show an event */
 522                 show_perf_probe_event(pp.event, pp.probes[0], &pp);
 523                 clear_probe_point(&pp);
 524         }
 525
 526         strlist__delete(rawlist);
 527 }
 528
 529 /* Get current perf-probe event names */
 530 static struct strlist *get_perf_event_names(int fd, bool include_group)
 531 {
 532         char buf[128];
 533         struct strlist *sl, *rawlist;
 534         struct str_node *ent;
 535         struct probe_point pp;
 536
 537         memset(&pp, 0, sizeof(pp));
 538         rawlist = get_trace_kprobe_event_rawlist(fd);
 539
 540         sl = strlist__new(true, NULL);
 541         strlist__for_each(ent, rawlist) {
 542                 parse_trace_kprobe_event(ent->s, &pp);
 543                 if (include_group) {
 544                         if (e_snprintf(buf, 128, "%s:%s", pp.group,
 545                                        pp.event) < 0)
 546                                 die("Failed to copy group:event name.");
 547                         strlist__add(sl, buf);
 548                 } else
 549                         strlist__add(sl, pp.event);
 550                 clear_probe_point(&pp);
 551         }
 552
 553         strlist__delete(rawlist);
 554
 555         return sl;
 556 }
 557
 558 static void write_trace_kprobe_event(int fd, const char *buf)
 559 {
 560         int ret;
 561
 562         pr_debug("Writing event: %s\n", buf);
 563         ret = write(fd, buf, strlen(buf));
 564         if (ret <= 0)
 565                 die("Failed to write event: %s", strerror(errno));
 566 }
 567
 568 static void get_new_event_name(char *buf, size_t len, const char *base,
 569                                struct strlist *namelist, bool allow_suffix)
 570 {
 571         int i, ret;
 572
 573         /* Try no suffix */
 574         ret = e_snprintf(buf, len, "%s", base);
 575         if (ret < 0)
 576                 die("snprintf() failed: %s", strerror(-ret));
 577         if (!strlist__has_entry(namelist, buf))
 578                 return;
 579
 580         if (!allow_suffix) {
 581                 pr_warning("Error: event \"%s\" already exists. "
 582                            "(Use -f to force duplicates.)\n", base);
 583                 die("Can't add new event.");
 584         }
 585
 586         /* Try to add suffix */
 587         for (i = 1; i < MAX_EVENT_INDEX; i++) {
 588                 ret = e_snprintf(buf, len, "%s_%d", base, i);
 589                 if (ret < 0)
 590                         die("snprintf() failed: %s", strerror(-ret));
 591                 if (!strlist__has_entry(namelist, buf))
 592                         break;
 593         }
 594         if (i == MAX_EVENT_INDEX)
 595                 die("Too many events are on the same function.");
 596 }
 597
 598 void add_trace_kprobe_events(struct probe_point *probes, int nr_probes,
 599                              bool force_add)
 600 {
 601         int i, j, fd;
 602         struct probe_point *pp;
 603         char buf[MAX_CMDLEN];
 604         char event[64];
 605         struct strlist *namelist;
 606         bool allow_suffix;
 607
 608         fd = open_kprobe_events(O_RDWR, O_APPEND);
 609         /* Get current event names */
 610         namelist = get_perf_event_names(fd, false);
 611
 612         for (j = 0; j < nr_probes; j++) {
 613                 pp = probes + j;
 614                 if (!pp->event)
 615                         pp->event = strdup(pp->function);
 616                 if (!pp->group)
 617                         pp->group = strdup(PERFPROBE_GROUP);
 618                 DIE_IF(!pp->event || !pp->group);
 619                 /* If force_add is true, suffix search is allowed */
 620                 allow_suffix = force_add;
 621                 for (i = 0; i < pp->found; i++) {
 622                         /* Get an unused new event name */
 623                         get_new_event_name(event, 64, pp->event, namelist,
 624                                            allow_suffix);
 625                         snprintf(buf, MAX_CMDLEN, "%c:%s/%s %s\n",
 626                                  pp->retprobe ? 'r' : 'p',
 627                                  pp->group, event,
 628                                  pp->probes[i]);
 629                         write_trace_kprobe_event(fd, buf);
 630                         printf("Added new event:\n");
 631                         /* Get the first parameter (probe-point) */
 632                         sscanf(pp->probes[i], "%s", buf);
 633                         show_perf_probe_event(event, buf, pp);
 634                         /* Add added event name to namelist */
 635                         strlist__add(namelist, event);
 636                         /*
 637                          * Probes after the first probe which comes from same
 638                          * user input are always allowed to add suffix, because
 639                          * there might be several addresses corresponding to
 640                          * one code line.
 641                          */
 642                         allow_suffix = true;
 643                 }
 644         }
 645         /* Show how to use the event. */
 646         printf("\nYou can now use it on all perf tools, such as:\n\n");
 647         printf("\tperf record -e %s:%s -a sleep 1\n\n", PERFPROBE_GROUP, event);
 648
 649         strlist__delete(namelist);
 650         close(fd);
 651 }
 652
 653 static void __del_trace_kprobe_event(int fd, struct str_node *ent)
 654 {
 655         char *p;
 656         char buf[128];
 657
 658         /* Convert from perf-probe event to trace-kprobe event */
 659         if (e_snprintf(buf, 128, "-:%s", ent->s) < 0)
 660                 die("Failed to copy event.");
 661         p = strchr(buf + 2, ':');
 662         if (!p)
 663                 die("Internal error: %s should have ':' but not.", ent->s);
 664         *p = '/';
 665
 666         write_trace_kprobe_event(fd, buf);
 667         printf("Remove event: %s\n", ent->s);
 668 }
 669
 670 static void del_trace_kprobe_event(int fd, const char *group,
 671                                    const char *event, struct strlist *namelist)
 672 {
 673         char buf[128];
 674         struct str_node *ent, *n;
 675         int found = 0;
 676
 677         if (e_snprintf(buf, 128, "%s:%s", group, event) < 0)
 678                 die("Failed to copy event.");
 679
 680         if (strpbrk(buf, "*?")) { /* Glob-exp */
 681                 strlist__for_each_safe(ent, n, namelist)
 682                         if (strglobmatch(ent->s, buf)) {
 683                                 found++;
 684                                 __del_trace_kprobe_event(fd, ent);
 685                                 strlist__remove(namelist, ent);
 686                         }
 687         } else {
 688                 ent = strlist__find(namelist, buf);
 689                 if (ent) {
 690                         found++;
 691                         __del_trace_kprobe_event(fd, ent);
 692                         strlist__remove(namelist, ent);
 693                 }
 694         }
 695         if (found == 0)
 696                 pr_info("Info: event \"%s\" does not exist, could not remove it.\n", buf);
 697 }
 698
 699 void del_trace_kprobe_events(struct strlist *dellist)
 700 {
 701         int fd;
 702         const char *group, *event;
 703         char *p, *str;
 704         struct str_node *ent;
 705         struct strlist *namelist;
 706
 707         fd = open_kprobe_events(O_RDWR, O_APPEND);
 708         /* Get current event names */
 709         namelist = get_perf_event_names(fd, true);
 710
 711         strlist__for_each(ent, dellist) {
 712                 str = strdup(ent->s);
 713                 if (!str)
 714                         die("Failed to copy event.");
 715                 pr_debug("Parsing: %s\n", str);
 716                 p = strchr(str, ':');
 717                 if (p) {
 718                         group = str;
 719                         *p = '\0';
 720                         event = p + 1;
 721                 } else {
 722                         group = "*";
 723                         event = str;
 724                 }
 725                 pr_debug("Group: %s, Event: %s\n", group, event);
 726                 del_trace_kprobe_event(fd, group, event, namelist);
 727                 free(str);
 728         }
 729         strlist__delete(namelist);
 730         close(fd);
 731 }
 732
 733 #define LINEBUF_SIZE 256
 734 #define NR_ADDITIONAL_LINES 2
 735
 736 static void show_one_line(FILE *fp, unsigned int l, bool skip, bool show_num)
 737 {
 738         char buf[LINEBUF_SIZE];
 739         const char *color = PERF_COLOR_BLUE;
 740
 741         if (fgets(buf, LINEBUF_SIZE, fp) == NULL)
 742                 goto error;
 743         if (!skip) {
 744                 if (show_num)
 745                         fprintf(stdout, "%7u  %s", l, buf);
 746                 else
 747                         color_fprintf(stdout, color, "         %s", buf);
 748         }
 749
 750         while (strlen(buf) == LINEBUF_SIZE - 1 &&
 751                buf[LINEBUF_SIZE - 2] != '\n') {
 752                 if (fgets(buf, LINEBUF_SIZE, fp) == NULL)
 753                         goto error;
 754                 if (!skip) {
 755                         if (show_num)
 756                                 fprintf(stdout, "%s", buf);
 757                         else
 758                                 color_fprintf(stdout, color, "%s", buf);
 759                 }
 760         }
 761         return;
 762 error:
 763         if (feof(fp))
 764                 die("Source file is shorter than expected.");
 765         else
 766                 die("File read error: %s", strerror(errno));
 767 }
 768
 769 void show_line_range(struct line_range *lr)
 770 {
 771         unsigned int l = 1;
 772         struct line_node *ln;
 773         FILE *fp;
 774
 775         setup_pager();
 776
 777         if (lr->function)
 778                 fprintf(stdout, "<%s:%d>\n", lr->function,
 779                         lr->start - lr->offset);
 780         else
 781                 fprintf(stdout, "<%s:%d>\n", lr->file, lr->start);
 782
 783         fp = fopen(lr->path, "r");
 784         if (fp == NULL)
 785                 die("Failed to open %s: %s", lr->path, strerror(errno));
 786         /* Skip to starting line number */
 787         while (l < lr->start)
 788                 show_one_line(fp, l++, true, false);
 789
 790         list_for_each_entry(ln, &lr->line_list, list) {
 791                 while (ln->line > l)
 792                         show_one_line(fp, (l++) - lr->offset, false, false);
 793                 show_one_line(fp, (l++) - lr->offset, false, true);
 794         }
 795
 796         if (lr->end == INT_MAX)
 797                 lr->end = l + NR_ADDITIONAL_LINES;
 798         while (l < lr->end && !feof(fp))
 799                 show_one_line(fp, (l++) - lr->offset, false, false);
 800
 801         fclose(fp);
 802 }