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Linux/tools/perf/util/build-id.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * build-id.c
  4  *
  5  * build-id support
  6  *
  7  * Copyright (C) 2009, 2010 Red Hat Inc.
  8  * Copyright (C) 2009, 2010 Arnaldo Carvalho de Melo <acme@redhat.com>
  9  */
 10 #include "util.h"
 11 #include <dirent.h>
 12 #include <errno.h>
 13 #include <stdio.h>
 14 #include <sys/stat.h>
 15 #include <sys/types.h>
 16 #include "build-id.h"
 17 #include "event.h"
 18 #include "symbol.h"
 19 #include "thread.h"
 20 #include <linux/kernel.h>
 21 #include "debug.h"
 22 #include "session.h"
 23 #include "tool.h"
 24 #include "header.h"
 25 #include "vdso.h"
 26 #include "path.h"
 27 #include "probe-file.h"
 28 #include "strlist.h"
 29 
 30 #include "sane_ctype.h"
 31 
 32 static bool no_buildid_cache;
 33 
 34 int build_id__mark_dso_hit(struct perf_tool *tool __maybe_unused,
 35                            union perf_event *event,
 36                            struct perf_sample *sample,
 37                            struct perf_evsel *evsel __maybe_unused,
 38                            struct machine *machine)
 39 {
 40         struct addr_location al;
 41         struct thread *thread = machine__findnew_thread(machine, sample->pid,
 42                                                         sample->tid);
 43 
 44         if (thread == NULL) {
 45                 pr_err("problem processing %d event, skipping it.\n",
 46                         event->header.type);
 47                 return -1;
 48         }
 49 
 50         if (thread__find_map(thread, sample->cpumode, sample->ip, &al))
 51                 al.map->dso->hit = 1;
 52 
 53         thread__put(thread);
 54         return 0;
 55 }
 56 
 57 static int perf_event__exit_del_thread(struct perf_tool *tool __maybe_unused,
 58                                        union perf_event *event,
 59                                        struct perf_sample *sample
 60                                        __maybe_unused,
 61                                        struct machine *machine)
 62 {
 63         struct thread *thread = machine__findnew_thread(machine,
 64                                                         event->fork.pid,
 65                                                         event->fork.tid);
 66 
 67         dump_printf("(%d:%d):(%d:%d)\n", event->fork.pid, event->fork.tid,
 68                     event->fork.ppid, event->fork.ptid);
 69 
 70         if (thread) {
 71                 machine__remove_thread(machine, thread);
 72                 thread__put(thread);
 73         }
 74 
 75         return 0;
 76 }
 77 
 78 struct perf_tool build_id__mark_dso_hit_ops = {
 79         .sample = build_id__mark_dso_hit,
 80         .mmap   = perf_event__process_mmap,
 81         .mmap2  = perf_event__process_mmap2,
 82         .fork   = perf_event__process_fork,
 83         .exit   = perf_event__exit_del_thread,
 84         .attr            = perf_event__process_attr,
 85         .build_id        = perf_event__process_build_id,
 86         .ordered_events  = true,
 87 };
 88 
 89 int build_id__sprintf(const u8 *build_id, int len, char *bf)
 90 {
 91         char *bid = bf;
 92         const u8 *raw = build_id;
 93         int i;
 94 
 95         for (i = 0; i < len; ++i) {
 96                 sprintf(bid, "%02x", *raw);
 97                 ++raw;
 98                 bid += 2;
 99         }
100 
101         return (bid - bf) + 1;
102 }
103 
104 int sysfs__sprintf_build_id(const char *root_dir, char *sbuild_id)
105 {
106         char notes[PATH_MAX];
107         u8 build_id[BUILD_ID_SIZE];
108         int ret;
109 
110         if (!root_dir)
111                 root_dir = "";
112 
113         scnprintf(notes, sizeof(notes), "%s/sys/kernel/notes", root_dir);
114 
115         ret = sysfs__read_build_id(notes, build_id, sizeof(build_id));
116         if (ret < 0)
117                 return ret;
118 
119         return build_id__sprintf(build_id, sizeof(build_id), sbuild_id);
120 }
121 
122 int filename__sprintf_build_id(const char *pathname, char *sbuild_id)
123 {
124         u8 build_id[BUILD_ID_SIZE];
125         int ret;
126 
127         ret = filename__read_build_id(pathname, build_id, sizeof(build_id));
128         if (ret < 0)
129                 return ret;
130         else if (ret != sizeof(build_id))
131                 return -EINVAL;
132 
133         return build_id__sprintf(build_id, sizeof(build_id), sbuild_id);
134 }
135 
136 /* asnprintf consolidates asprintf and snprintf */
137 static int asnprintf(char **strp, size_t size, const char *fmt, ...)
138 {
139         va_list ap;
140         int ret;
141 
142         if (!strp)
143                 return -EINVAL;
144 
145         va_start(ap, fmt);
146         if (*strp)
147                 ret = vsnprintf(*strp, size, fmt, ap);
148         else
149                 ret = vasprintf(strp, fmt, ap);
150         va_end(ap);
151 
152         return ret;
153 }
154 
155 char *build_id_cache__kallsyms_path(const char *sbuild_id, char *bf,
156                                     size_t size)
157 {
158         bool retry_old = true;
159 
160         snprintf(bf, size, "%s/%s/%s/kallsyms",
161                  buildid_dir, DSO__NAME_KALLSYMS, sbuild_id);
162 retry:
163         if (!access(bf, F_OK))
164                 return bf;
165         if (retry_old) {
166                 /* Try old style kallsyms cache */
167                 snprintf(bf, size, "%s/%s/%s",
168                          buildid_dir, DSO__NAME_KALLSYMS, sbuild_id);
169                 retry_old = false;
170                 goto retry;
171         }
172 
173         return NULL;
174 }
175 
176 char *build_id_cache__linkname(const char *sbuild_id, char *bf, size_t size)
177 {
178         char *tmp = bf;
179         int ret = asnprintf(&bf, size, "%s/.build-id/%.2s/%s", buildid_dir,
180                             sbuild_id, sbuild_id + 2);
181         if (ret < 0 || (tmp && size < (unsigned int)ret))
182                 return NULL;
183         return bf;
184 }
185 
186 char *build_id_cache__origname(const char *sbuild_id)
187 {
188         char *linkname;
189         char buf[PATH_MAX];
190         char *ret = NULL, *p;
191         size_t offs = 5;        /* == strlen("../..") */
192         ssize_t len;
193 
194         linkname = build_id_cache__linkname(sbuild_id, NULL, 0);
195         if (!linkname)
196                 return NULL;
197 
198         len = readlink(linkname, buf, sizeof(buf) - 1);
199         if (len <= 0)
200                 goto out;
201         buf[len] = '\0';
202 
203         /* The link should be "../..<origpath>/<sbuild_id>" */
204         p = strrchr(buf, '/');  /* Cut off the "/<sbuild_id>" */
205         if (p && (p > buf + offs)) {
206                 *p = '\0';
207                 if (buf[offs + 1] == '[')
208                         offs++; /*
209                                  * This is a DSO name, like [kernel.kallsyms].
210                                  * Skip the first '/', since this is not the
211                                  * cache of a regular file.
212                                  */
213                 ret = strdup(buf + offs);       /* Skip "../..[/]" */
214         }
215 out:
216         free(linkname);
217         return ret;
218 }
219 
220 /* Check if the given build_id cache is valid on current running system */
221 static bool build_id_cache__valid_id(char *sbuild_id)
222 {
223         char real_sbuild_id[SBUILD_ID_SIZE] = "";
224         char *pathname;
225         int ret = 0;
226         bool result = false;
227 
228         pathname = build_id_cache__origname(sbuild_id);
229         if (!pathname)
230                 return false;
231 
232         if (!strcmp(pathname, DSO__NAME_KALLSYMS))
233                 ret = sysfs__sprintf_build_id("/", real_sbuild_id);
234         else if (pathname[0] == '/')
235                 ret = filename__sprintf_build_id(pathname, real_sbuild_id);
236         else
237                 ret = -EINVAL;  /* Should we support other special DSO cache? */
238         if (ret >= 0)
239                 result = (strcmp(sbuild_id, real_sbuild_id) == 0);
240         free(pathname);
241 
242         return result;
243 }
244 
245 static const char *build_id_cache__basename(bool is_kallsyms, bool is_vdso,
246                                             bool is_debug)
247 {
248         return is_kallsyms ? "kallsyms" : (is_vdso ? "vdso" : (is_debug ?
249             "debug" : "elf"));
250 }
251 
252 char *dso__build_id_filename(const struct dso *dso, char *bf, size_t size,
253                              bool is_debug)
254 {
255         bool is_kallsyms = dso__is_kallsyms((struct dso *)dso);
256         bool is_vdso = dso__is_vdso((struct dso *)dso);
257         char sbuild_id[SBUILD_ID_SIZE];
258         char *linkname;
259         bool alloc = (bf == NULL);
260         int ret;
261 
262         if (!dso->has_build_id)
263                 return NULL;
264 
265         build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id);
266         linkname = build_id_cache__linkname(sbuild_id, NULL, 0);
267         if (!linkname)
268                 return NULL;
269 
270         /* Check if old style build_id cache */
271         if (is_regular_file(linkname))
272                 ret = asnprintf(&bf, size, "%s", linkname);
273         else
274                 ret = asnprintf(&bf, size, "%s/%s", linkname,
275                          build_id_cache__basename(is_kallsyms, is_vdso,
276                                                   is_debug));
277         if (ret < 0 || (!alloc && size < (unsigned int)ret))
278                 bf = NULL;
279         free(linkname);
280 
281         return bf;
282 }
283 
284 #define dsos__for_each_with_build_id(pos, head) \
285         list_for_each_entry(pos, head, node)    \
286                 if (!pos->has_build_id)         \
287                         continue;               \
288                 else
289 
290 static int write_buildid(const char *name, size_t name_len, u8 *build_id,
291                          pid_t pid, u16 misc, struct feat_fd *fd)
292 {
293         int err;
294         struct build_id_event b;
295         size_t len;
296 
297         len = name_len + 1;
298         len = PERF_ALIGN(len, NAME_ALIGN);
299 
300         memset(&b, 0, sizeof(b));
301         memcpy(&b.build_id, build_id, BUILD_ID_SIZE);
302         b.pid = pid;
303         b.header.misc = misc;
304         b.header.size = sizeof(b) + len;
305 
306         err = do_write(fd, &b, sizeof(b));
307         if (err < 0)
308                 return err;
309 
310         return write_padded(fd, name, name_len + 1, len);
311 }
312 
313 static int machine__write_buildid_table(struct machine *machine,
314                                         struct feat_fd *fd)
315 {
316         int err = 0;
317         struct dso *pos;
318         u16 kmisc = PERF_RECORD_MISC_KERNEL,
319             umisc = PERF_RECORD_MISC_USER;
320 
321         if (!machine__is_host(machine)) {
322                 kmisc = PERF_RECORD_MISC_GUEST_KERNEL;
323                 umisc = PERF_RECORD_MISC_GUEST_USER;
324         }
325 
326         dsos__for_each_with_build_id(pos, &machine->dsos.head) {
327                 const char *name;
328                 size_t name_len;
329                 bool in_kernel = false;
330 
331                 if (!pos->hit && !dso__is_vdso(pos))
332                         continue;
333 
334                 if (dso__is_vdso(pos)) {
335                         name = pos->short_name;
336                         name_len = pos->short_name_len;
337                 } else if (dso__is_kcore(pos)) {
338                         name = machine->mmap_name;
339                         name_len = strlen(name);
340                 } else {
341                         name = pos->long_name;
342                         name_len = pos->long_name_len;
343                 }
344 
345                 in_kernel = pos->kernel ||
346                                 is_kernel_module(name,
347                                         PERF_RECORD_MISC_CPUMODE_UNKNOWN);
348                 err = write_buildid(name, name_len, pos->build_id, machine->pid,
349                                     in_kernel ? kmisc : umisc, fd);
350                 if (err)
351                         break;
352         }
353 
354         return err;
355 }
356 
357 int perf_session__write_buildid_table(struct perf_session *session,
358                                       struct feat_fd *fd)
359 {
360         struct rb_node *nd;
361         int err = machine__write_buildid_table(&session->machines.host, fd);
362 
363         if (err)
364                 return err;
365 
366         for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) {
367                 struct machine *pos = rb_entry(nd, struct machine, rb_node);
368                 err = machine__write_buildid_table(pos, fd);
369                 if (err)
370                         break;
371         }
372         return err;
373 }
374 
375 static int __dsos__hit_all(struct list_head *head)
376 {
377         struct dso *pos;
378 
379         list_for_each_entry(pos, head, node)
380                 pos->hit = true;
381 
382         return 0;
383 }
384 
385 static int machine__hit_all_dsos(struct machine *machine)
386 {
387         return __dsos__hit_all(&machine->dsos.head);
388 }
389 
390 int dsos__hit_all(struct perf_session *session)
391 {
392         struct rb_node *nd;
393         int err;
394 
395         err = machine__hit_all_dsos(&session->machines.host);
396         if (err)
397                 return err;
398 
399         for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) {
400                 struct machine *pos = rb_entry(nd, struct machine, rb_node);
401 
402                 err = machine__hit_all_dsos(pos);
403                 if (err)
404                         return err;
405         }
406 
407         return 0;
408 }
409 
410 void disable_buildid_cache(void)
411 {
412         no_buildid_cache = true;
413 }
414 
415 static bool lsdir_bid_head_filter(const char *name __maybe_unused,
416                                   struct dirent *d)
417 {
418         return (strlen(d->d_name) == 2) &&
419                 isxdigit(d->d_name[0]) && isxdigit(d->d_name[1]);
420 }
421 
422 static bool lsdir_bid_tail_filter(const char *name __maybe_unused,
423                                   struct dirent *d)
424 {
425         int i = 0;
426         while (isxdigit(d->d_name[i]) && i < SBUILD_ID_SIZE - 3)
427                 i++;
428         return (i == SBUILD_ID_SIZE - 3) && (d->d_name[i] == '\0');
429 }
430 
431 struct strlist *build_id_cache__list_all(bool validonly)
432 {
433         struct strlist *toplist, *linklist = NULL, *bidlist;
434         struct str_node *nd, *nd2;
435         char *topdir, *linkdir = NULL;
436         char sbuild_id[SBUILD_ID_SIZE];
437 
438         /* for filename__ functions */
439         if (validonly)
440                 symbol__init(NULL);
441 
442         /* Open the top-level directory */
443         if (asprintf(&topdir, "%s/.build-id/", buildid_dir) < 0)
444                 return NULL;
445 
446         bidlist = strlist__new(NULL, NULL);
447         if (!bidlist)
448                 goto out;
449 
450         toplist = lsdir(topdir, lsdir_bid_head_filter);
451         if (!toplist) {
452                 pr_debug("Error in lsdir(%s): %d\n", topdir, errno);
453                 /* If there is no buildid cache, return an empty list */
454                 if (errno == ENOENT)
455                         goto out;
456                 goto err_out;
457         }
458 
459         strlist__for_each_entry(nd, toplist) {
460                 if (asprintf(&linkdir, "%s/%s", topdir, nd->s) < 0)
461                         goto err_out;
462                 /* Open the lower-level directory */
463                 linklist = lsdir(linkdir, lsdir_bid_tail_filter);
464                 if (!linklist) {
465                         pr_debug("Error in lsdir(%s): %d\n", linkdir, errno);
466                         goto err_out;
467                 }
468                 strlist__for_each_entry(nd2, linklist) {
469                         if (snprintf(sbuild_id, SBUILD_ID_SIZE, "%s%s",
470                                      nd->s, nd2->s) != SBUILD_ID_SIZE - 1)
471                                 goto err_out;
472                         if (validonly && !build_id_cache__valid_id(sbuild_id))
473                                 continue;
474                         if (strlist__add(bidlist, sbuild_id) < 0)
475                                 goto err_out;
476                 }
477                 strlist__delete(linklist);
478                 zfree(&linkdir);
479         }
480 
481 out_free:
482         strlist__delete(toplist);
483 out:
484         free(topdir);
485 
486         return bidlist;
487 
488 err_out:
489         strlist__delete(linklist);
490         zfree(&linkdir);
491         strlist__delete(bidlist);
492         bidlist = NULL;
493         goto out_free;
494 }
495 
496 static bool str_is_build_id(const char *maybe_sbuild_id, size_t len)
497 {
498         size_t i;
499 
500         for (i = 0; i < len; i++) {
501                 if (!isxdigit(maybe_sbuild_id[i]))
502                         return false;
503         }
504         return true;
505 }
506 
507 /* Return the valid complete build-id */
508 char *build_id_cache__complement(const char *incomplete_sbuild_id)
509 {
510         struct strlist *bidlist;
511         struct str_node *nd, *cand = NULL;
512         char *sbuild_id = NULL;
513         size_t len = strlen(incomplete_sbuild_id);
514 
515         if (len >= SBUILD_ID_SIZE ||
516             !str_is_build_id(incomplete_sbuild_id, len))
517                 return NULL;
518 
519         bidlist = build_id_cache__list_all(true);
520         if (!bidlist)
521                 return NULL;
522 
523         strlist__for_each_entry(nd, bidlist) {
524                 if (strncmp(nd->s, incomplete_sbuild_id, len) != 0)
525                         continue;
526                 if (cand) {     /* Error: There are more than 2 candidates. */
527                         cand = NULL;
528                         break;
529                 }
530                 cand = nd;
531         }
532         if (cand)
533                 sbuild_id = strdup(cand->s);
534         strlist__delete(bidlist);
535 
536         return sbuild_id;
537 }
538 
539 char *build_id_cache__cachedir(const char *sbuild_id, const char *name,
540                                struct nsinfo *nsi, bool is_kallsyms,
541                                bool is_vdso)
542 {
543         char *realname = (char *)name, *filename;
544         bool slash = is_kallsyms || is_vdso;
545 
546         if (!slash) {
547                 realname = nsinfo__realpath(name, nsi);
548                 if (!realname)
549                         return NULL;
550         }
551 
552         if (asprintf(&filename, "%s%s%s%s%s", buildid_dir, slash ? "/" : "",
553                      is_vdso ? DSO__NAME_VDSO : realname,
554                      sbuild_id ? "/" : "", sbuild_id ?: "") < 0)
555                 filename = NULL;
556 
557         if (!slash)
558                 free(realname);
559 
560         return filename;
561 }
562 
563 int build_id_cache__list_build_ids(const char *pathname, struct nsinfo *nsi,
564                                    struct strlist **result)
565 {
566         char *dir_name;
567         int ret = 0;
568 
569         dir_name = build_id_cache__cachedir(NULL, pathname, nsi, false, false);
570         if (!dir_name)
571                 return -ENOMEM;
572 
573         *result = lsdir(dir_name, lsdir_no_dot_filter);
574         if (!*result)
575                 ret = -errno;
576         free(dir_name);
577 
578         return ret;
579 }
580 
581 #if defined(HAVE_LIBELF_SUPPORT) && defined(HAVE_GELF_GETNOTE_SUPPORT)
582 static int build_id_cache__add_sdt_cache(const char *sbuild_id,
583                                           const char *realname,
584                                           struct nsinfo *nsi)
585 {
586         struct probe_cache *cache;
587         int ret;
588         struct nscookie nsc;
589 
590         cache = probe_cache__new(sbuild_id, nsi);
591         if (!cache)
592                 return -1;
593 
594         nsinfo__mountns_enter(nsi, &nsc);
595         ret = probe_cache__scan_sdt(cache, realname);
596         nsinfo__mountns_exit(&nsc);
597         if (ret >= 0) {
598                 pr_debug4("Found %d SDTs in %s\n", ret, realname);
599                 if (probe_cache__commit(cache) < 0)
600                         ret = -1;
601         }
602         probe_cache__delete(cache);
603         return ret;
604 }
605 #else
606 #define build_id_cache__add_sdt_cache(sbuild_id, realname, nsi) (0)
607 #endif
608 
609 static char *build_id_cache__find_debug(const char *sbuild_id,
610                                         struct nsinfo *nsi)
611 {
612         char *realname = NULL;
613         char *debugfile;
614         struct nscookie nsc;
615         size_t len = 0;
616 
617         debugfile = calloc(1, PATH_MAX);
618         if (!debugfile)
619                 goto out;
620 
621         len = __symbol__join_symfs(debugfile, PATH_MAX,
622                                    "/usr/lib/debug/.build-id/");
623         snprintf(debugfile + len, PATH_MAX - len, "%.2s/%s.debug", sbuild_id,
624                  sbuild_id + 2);
625 
626         nsinfo__mountns_enter(nsi, &nsc);
627         realname = realpath(debugfile, NULL);
628         if (realname && access(realname, R_OK))
629                 zfree(&realname);
630         nsinfo__mountns_exit(&nsc);
631 out:
632         free(debugfile);
633         return realname;
634 }
635 
636 int build_id_cache__add_s(const char *sbuild_id, const char *name,
637                           struct nsinfo *nsi, bool is_kallsyms, bool is_vdso)
638 {
639         const size_t size = PATH_MAX;
640         char *realname = NULL, *filename = NULL, *dir_name = NULL,
641              *linkname = zalloc(size), *tmp;
642         char *debugfile = NULL;
643         int err = -1;
644 
645         if (!is_kallsyms) {
646                 if (!is_vdso)
647                         realname = nsinfo__realpath(name, nsi);
648                 else
649                         realname = realpath(name, NULL);
650                 if (!realname)
651                         goto out_free;
652         }
653 
654         dir_name = build_id_cache__cachedir(sbuild_id, name, nsi, is_kallsyms,
655                                             is_vdso);
656         if (!dir_name)
657                 goto out_free;
658 
659         /* Remove old style build-id cache */
660         if (is_regular_file(dir_name))
661                 if (unlink(dir_name))
662                         goto out_free;
663 
664         if (mkdir_p(dir_name, 0755))
665                 goto out_free;
666 
667         /* Save the allocated buildid dirname */
668         if (asprintf(&filename, "%s/%s", dir_name,
669                      build_id_cache__basename(is_kallsyms, is_vdso,
670                      false)) < 0) {
671                 filename = NULL;
672                 goto out_free;
673         }
674 
675         if (access(filename, F_OK)) {
676                 if (is_kallsyms) {
677                         if (copyfile("/proc/kallsyms", filename))
678                                 goto out_free;
679                 } else if (nsi && nsi->need_setns) {
680                         if (copyfile_ns(name, filename, nsi))
681                                 goto out_free;
682                 } else if (link(realname, filename) && errno != EEXIST &&
683                                 copyfile(name, filename))
684                         goto out_free;
685         }
686 
687         /* Some binaries are stripped, but have .debug files with their symbol
688          * table.  Check to see if we can locate one of those, since the elf
689          * file itself may not be very useful to users of our tools without a
690          * symtab.
691          */
692         if (!is_kallsyms && !is_vdso &&
693             strncmp(".ko", name + strlen(name) - 3, 3)) {
694                 debugfile = build_id_cache__find_debug(sbuild_id, nsi);
695                 if (debugfile) {
696                         zfree(&filename);
697                         if (asprintf(&filename, "%s/%s", dir_name,
698                             build_id_cache__basename(false, false, true)) < 0) {
699                                 filename = NULL;
700                                 goto out_free;
701                         }
702                         if (access(filename, F_OK)) {
703                                 if (nsi && nsi->need_setns) {
704                                         if (copyfile_ns(debugfile, filename,
705                                                         nsi))
706                                                 goto out_free;
707                                 } else if (link(debugfile, filename) &&
708                                                 errno != EEXIST &&
709                                                 copyfile(debugfile, filename))
710                                         goto out_free;
711                         }
712                 }
713         }
714 
715         if (!build_id_cache__linkname(sbuild_id, linkname, size))
716                 goto out_free;
717         tmp = strrchr(linkname, '/');
718         *tmp = '\0';
719 
720         if (access(linkname, X_OK) && mkdir_p(linkname, 0755))
721                 goto out_free;
722 
723         *tmp = '/';
724         tmp = dir_name + strlen(buildid_dir) - 5;
725         memcpy(tmp, "../..", 5);
726 
727         if (symlink(tmp, linkname) == 0)
728                 err = 0;
729 
730         /* Update SDT cache : error is just warned */
731         if (realname &&
732             build_id_cache__add_sdt_cache(sbuild_id, realname, nsi) < 0)
733                 pr_debug4("Failed to update/scan SDT cache for %s\n", realname);
734 
735 out_free:
736         if (!is_kallsyms)
737                 free(realname);
738         free(filename);
739         free(debugfile);
740         free(dir_name);
741         free(linkname);
742         return err;
743 }
744 
745 static int build_id_cache__add_b(const u8 *build_id, size_t build_id_size,
746                                  const char *name, struct nsinfo *nsi,
747                                  bool is_kallsyms, bool is_vdso)
748 {
749         char sbuild_id[SBUILD_ID_SIZE];
750 
751         build_id__sprintf(build_id, build_id_size, sbuild_id);
752 
753         return build_id_cache__add_s(sbuild_id, name, nsi, is_kallsyms,
754                                      is_vdso);
755 }
756 
757 bool build_id_cache__cached(const char *sbuild_id)
758 {
759         bool ret = false;
760         char *filename = build_id_cache__linkname(sbuild_id, NULL, 0);
761 
762         if (filename && !access(filename, F_OK))
763                 ret = true;
764         free(filename);
765 
766         return ret;
767 }
768 
769 int build_id_cache__remove_s(const char *sbuild_id)
770 {
771         const size_t size = PATH_MAX;
772         char *filename = zalloc(size),
773              *linkname = zalloc(size), *tmp;
774         int err = -1;
775 
776         if (filename == NULL || linkname == NULL)
777                 goto out_free;
778 
779         if (!build_id_cache__linkname(sbuild_id, linkname, size))
780                 goto out_free;
781 
782         if (access(linkname, F_OK))
783                 goto out_free;
784 
785         if (readlink(linkname, filename, size - 1) < 0)
786                 goto out_free;
787 
788         if (unlink(linkname))
789                 goto out_free;
790 
791         /*
792          * Since the link is relative, we must make it absolute:
793          */
794         tmp = strrchr(linkname, '/') + 1;
795         snprintf(tmp, size - (tmp - linkname), "%s", filename);
796 
797         if (rm_rf(linkname))
798                 goto out_free;
799 
800         err = 0;
801 out_free:
802         free(filename);
803         free(linkname);
804         return err;
805 }
806 
807 static int dso__cache_build_id(struct dso *dso, struct machine *machine)
808 {
809         bool is_kallsyms = dso__is_kallsyms(dso);
810         bool is_vdso = dso__is_vdso(dso);
811         const char *name = dso->long_name;
812 
813         if (dso__is_kcore(dso)) {
814                 is_kallsyms = true;
815                 name = machine->mmap_name;
816         }
817         return build_id_cache__add_b(dso->build_id, sizeof(dso->build_id), name,
818                                      dso->nsinfo, is_kallsyms, is_vdso);
819 }
820 
821 static int __dsos__cache_build_ids(struct list_head *head,
822                                    struct machine *machine)
823 {
824         struct dso *pos;
825         int err = 0;
826 
827         dsos__for_each_with_build_id(pos, head)
828                 if (dso__cache_build_id(pos, machine))
829                         err = -1;
830 
831         return err;
832 }
833 
834 static int machine__cache_build_ids(struct machine *machine)
835 {
836         return __dsos__cache_build_ids(&machine->dsos.head, machine);
837 }
838 
839 int perf_session__cache_build_ids(struct perf_session *session)
840 {
841         struct rb_node *nd;
842         int ret;
843 
844         if (no_buildid_cache)
845                 return 0;
846 
847         if (mkdir(buildid_dir, 0755) != 0 && errno != EEXIST)
848                 return -1;
849 
850         ret = machine__cache_build_ids(&session->machines.host);
851 
852         for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) {
853                 struct machine *pos = rb_entry(nd, struct machine, rb_node);
854                 ret |= machine__cache_build_ids(pos);
855         }
856         return ret ? -1 : 0;
857 }
858 
859 static bool machine__read_build_ids(struct machine *machine, bool with_hits)
860 {
861         return __dsos__read_build_ids(&machine->dsos.head, with_hits);
862 }
863 
864 bool perf_session__read_build_ids(struct perf_session *session, bool with_hits)
865 {
866         struct rb_node *nd;
867         bool ret = machine__read_build_ids(&session->machines.host, with_hits);
868 
869         for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) {
870                 struct machine *pos = rb_entry(nd, struct machine, rb_node);
871                 ret |= machine__read_build_ids(pos, with_hits);
872         }
873 
874         return ret;
875 }
876 

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