[deliverable/linux.git] / tools / perf / util / build-id.c

/*
 * build-id.c
 *
 * build-id support
 *
 * Copyright (C) 2009, 2010 Red Hat Inc.
 * Copyright (C) 2009, 2010 Arnaldo Carvalho de Melo <acme@redhat.com>
 */
#include "util.h"
#include <stdio.h>
#include "build-id.h"
#include "event.h"
#include "symbol.h"
#include <linux/kernel.h>
#include "debug.h"
#include "session.h"
#include "tool.h"
#include "header.h"
#include "vdso.h"


static bool no_buildid_cache;

int build_id__mark_dso_hit(struct perf_tool *tool __maybe_unused,
			   union perf_event *event,
			   struct perf_sample *sample,
			   struct perf_evsel *evsel __maybe_unused,
			   struct machine *machine)
{
	struct addr_location al;
	u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
	struct thread *thread = machine__findnew_thread(machine, sample->pid,
							sample->tid);

	if (thread == NULL) {
		pr_err("problem processing %d event, skipping it.\n",
			event->header.type);
		return -1;
	}

	thread__find_addr_map(thread, cpumode, MAP__FUNCTION, sample->ip, &al);

	if (al.map != NULL)
		al.map->dso->hit = 1;

	thread__put(thread);
	return 0;
}

static int perf_event__exit_del_thread(struct perf_tool *tool __maybe_unused,
				       union perf_event *event,
				       struct perf_sample *sample
				       __maybe_unused,
				       struct machine *machine)
{
	struct thread *thread = machine__findnew_thread(machine,
							event->fork.pid,
							event->fork.tid);

	dump_printf("(%d:%d):(%d:%d)\n", event->fork.pid, event->fork.tid,
		    event->fork.ppid, event->fork.ptid);

	if (thread) {
		machine__remove_thread(machine, thread);
		thread__put(thread);
	}

	return 0;
}

struct perf_tool build_id__mark_dso_hit_ops = {
	.sample	= build_id__mark_dso_hit,
	.mmap	= perf_event__process_mmap,
	.mmap2	= perf_event__process_mmap2,
	.fork	= perf_event__process_fork,
	.exit	= perf_event__exit_del_thread,
	.attr		 = perf_event__process_attr,
	.build_id	 = perf_event__process_build_id,
};

int build_id__sprintf(const u8 *build_id, int len, char *bf)
{
	char *bid = bf;
	const u8 *raw = build_id;
	int i;

	for (i = 0; i < len; ++i) {
		sprintf(bid, "%02x", *raw);
		++raw;
		bid += 2;
	}

	return raw - build_id;
}

/* asnprintf consolidates asprintf and snprintf */
static int asnprintf(char **strp, size_t size, const char *fmt, ...)
{
	va_list ap;
	int ret;

	if (!strp)
		return -EINVAL;

	va_start(ap, fmt);
	if (*strp)
		ret = vsnprintf(*strp, size, fmt, ap);
	else
		ret = vasprintf(strp, fmt, ap);
	va_end(ap);

	return ret;
}

static char *build_id__filename(const char *sbuild_id, char *bf, size_t size)
{
	char *tmp = bf;
	int ret = asnprintf(&bf, size, "%s/.build-id/%.2s/%s", buildid_dir,
			    sbuild_id, sbuild_id + 2);
	if (ret < 0 || (tmp && size < (unsigned int)ret))
		return NULL;
	return bf;
}

char *dso__build_id_filename(const struct dso *dso, char *bf, size_t size)
{
	char build_id_hex[SBUILD_ID_SIZE];

	if (!dso->has_build_id)
		return NULL;

	build_id__sprintf(dso->build_id, sizeof(dso->build_id), build_id_hex);
	return build_id__filename(build_id_hex, bf, size);
}

#define dsos__for_each_with_build_id(pos, head)	\
	list_for_each_entry(pos, head, node)	\
		if (!pos->has_build_id)		\
			continue;		\
		else

static int write_buildid(const char *name, size_t name_len, u8 *build_id,
			 pid_t pid, u16 misc, int fd)
{
	int err;
	struct build_id_event b;
	size_t len;

	len = name_len + 1;
	len = PERF_ALIGN(len, NAME_ALIGN);

	memset(&b, 0, sizeof(b));
	memcpy(&b.build_id, build_id, BUILD_ID_SIZE);
	b.pid = pid;
	b.header.misc = misc;
	b.header.size = sizeof(b) + len;

	err = writen(fd, &b, sizeof(b));
	if (err < 0)
		return err;

	return write_padded(fd, name, name_len + 1, len);
}

static int machine__write_buildid_table(struct machine *machine, int fd)
{
	int err = 0;
	char nm[PATH_MAX];
	struct dso *pos;
	u16 kmisc = PERF_RECORD_MISC_KERNEL,
	    umisc = PERF_RECORD_MISC_USER;

	if (!machine__is_host(machine)) {
		kmisc = PERF_RECORD_MISC_GUEST_KERNEL;
		umisc = PERF_RECORD_MISC_GUEST_USER;
	}

	dsos__for_each_with_build_id(pos, &machine->dsos.head) {
		const char *name;
		size_t name_len;

		if (!pos->hit)
			continue;

		if (dso__is_vdso(pos)) {
			name = pos->short_name;
			name_len = pos->short_name_len + 1;
		} else if (dso__is_kcore(pos)) {
			machine__mmap_name(machine, nm, sizeof(nm));
			name = nm;
			name_len = strlen(nm) + 1;
		} else {
			name = pos->long_name;
			name_len = pos->long_name_len + 1;
		}

		err = write_buildid(name, name_len, pos->build_id, machine->pid,
				    pos->kernel ? kmisc : umisc, fd);
		if (err)
			break;
	}

	return err;
}

int perf_session__write_buildid_table(struct perf_session *session, int fd)
{
	struct rb_node *nd;
	int err = machine__write_buildid_table(&session->machines.host, fd);

	if (err)
		return err;

	for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) {
		struct machine *pos = rb_entry(nd, struct machine, rb_node);
		err = machine__write_buildid_table(pos, fd);
		if (err)
			break;
	}
	return err;
}

static int __dsos__hit_all(struct list_head *head)
{
	struct dso *pos;

	list_for_each_entry(pos, head, node)
		pos->hit = true;

	return 0;
}

static int machine__hit_all_dsos(struct machine *machine)
{
	return __dsos__hit_all(&machine->dsos.head);
}

int dsos__hit_all(struct perf_session *session)
{
	struct rb_node *nd;
	int err;

	err = machine__hit_all_dsos(&session->machines.host);
	if (err)
		return err;

	for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) {
		struct machine *pos = rb_entry(nd, struct machine, rb_node);

		err = machine__hit_all_dsos(pos);
		if (err)
			return err;
	}

	return 0;
}

void disable_buildid_cache(void)
{
	no_buildid_cache = true;
}

static char *build_id_cache__dirname_from_path(const char *name,
					       bool is_kallsyms, bool is_vdso)
{
	char *realname = (char *)name, *filename;
	bool slash = is_kallsyms || is_vdso;

	if (!slash) {
		realname = realpath(name, NULL);
		if (!realname)
			return NULL;
	}

	if (asprintf(&filename, "%s%s%s", buildid_dir, slash ? "/" : "",
		     is_vdso ? DSO__NAME_VDSO : realname) < 0)
		filename = NULL;

	if (!slash)
		free(realname);

	return filename;
}

int build_id_cache__list_build_ids(const char *pathname,
				   struct strlist **result)
{
	struct strlist *list;
	char *dir_name;
	DIR *dir;
	struct dirent *d;
	int ret = 0;

	list = strlist__new(NULL, NULL);
	dir_name = build_id_cache__dirname_from_path(pathname, false, false);
	if (!list || !dir_name) {
		ret = -ENOMEM;
		goto out;
	}

	/* List up all dirents */
	dir = opendir(dir_name);
	if (!dir) {
		ret = -errno;
		goto out;
	}

	while ((d = readdir(dir)) != NULL) {
		if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
			continue;
		strlist__add(list, d->d_name);
	}
	closedir(dir);

out:
	free(dir_name);
	if (ret)
		strlist__delete(list);
	else
		*result = list;

	return ret;
}

int build_id_cache__add_s(const char *sbuild_id, const char *name,
			  bool is_kallsyms, bool is_vdso)
{
	const size_t size = PATH_MAX;
	char *realname = NULL, *filename = NULL, *dir_name = NULL,
	     *linkname = zalloc(size), *targetname, *tmp;
	int err = -1;

	if (!is_kallsyms) {
		realname = realpath(name, NULL);
		if (!realname)
			goto out_free;
	}

	dir_name = build_id_cache__dirname_from_path(name, is_kallsyms, is_vdso);
	if (!dir_name)
		goto out_free;

	if (mkdir_p(dir_name, 0755))
		goto out_free;

	if (asprintf(&filename, "%s/%s", dir_name, sbuild_id) < 0) {
		filename = NULL;
		goto out_free;
	}

	if (access(filename, F_OK)) {
		if (is_kallsyms) {
			 if (copyfile("/proc/kallsyms", filename))
				goto out_free;
		} else if (link(realname, filename) && errno != EEXIST &&
				copyfile(name, filename))
			goto out_free;
	}

	if (!build_id__filename(sbuild_id, linkname, size))
		goto out_free;
	tmp = strrchr(linkname, '/');
	*tmp = '\0';

	if (access(linkname, X_OK) && mkdir_p(linkname, 0755))
		goto out_free;

	*tmp = '/';
	targetname = filename + strlen(buildid_dir) - 5;
	memcpy(targetname, "../..", 5);

	if (symlink(targetname, linkname) == 0)
		err = 0;
out_free:
	if (!is_kallsyms)
		free(realname);
	free(filename);
	free(dir_name);
	free(linkname);
	return err;
}

static int build_id_cache__add_b(const u8 *build_id, size_t build_id_size,
				 const char *name, bool is_kallsyms,
				 bool is_vdso)
{
	char sbuild_id[SBUILD_ID_SIZE];

	build_id__sprintf(build_id, build_id_size, sbuild_id);

	return build_id_cache__add_s(sbuild_id, name, is_kallsyms, is_vdso);
}

bool build_id_cache__cached(const char *sbuild_id)
{
	bool ret = false;
	char *filename = build_id__filename(sbuild_id, NULL, 0);

	if (filename && !access(filename, F_OK))
		ret = true;
	free(filename);

	return ret;
}

int build_id_cache__remove_s(const char *sbuild_id)
{
	const size_t size = PATH_MAX;
	char *filename = zalloc(size),
	     *linkname = zalloc(size), *tmp;
	int err = -1;

	if (filename == NULL || linkname == NULL)
		goto out_free;

	if (!build_id__filename(sbuild_id, linkname, size))
		goto out_free;

	if (access(linkname, F_OK))
		goto out_free;

	if (readlink(linkname, filename, size - 1) < 0)
		goto out_free;

	if (unlink(linkname))
		goto out_free;

	/*
	 * Since the link is relative, we must make it absolute:
	 */
	tmp = strrchr(linkname, '/') + 1;
	snprintf(tmp, size - (tmp - linkname), "%s", filename);

	if (unlink(linkname))
		goto out_free;

	err = 0;
out_free:
	free(filename);
	free(linkname);
	return err;
}

static int dso__cache_build_id(struct dso *dso, struct machine *machine)
{
	bool is_kallsyms = dso->kernel && dso->long_name[0] != '/';
	bool is_vdso = dso__is_vdso(dso);
	const char *name = dso->long_name;
	char nm[PATH_MAX];

	if (dso__is_kcore(dso)) {
		is_kallsyms = true;
		machine__mmap_name(machine, nm, sizeof(nm));
		name = nm;
	}
	return build_id_cache__add_b(dso->build_id, sizeof(dso->build_id), name,
				     is_kallsyms, is_vdso);
}

static int __dsos__cache_build_ids(struct list_head *head,
				   struct machine *machine)
{
	struct dso *pos;
	int err = 0;

	dsos__for_each_with_build_id(pos, head)
		if (dso__cache_build_id(pos, machine))
			err = -1;

	return err;
}

static int machine__cache_build_ids(struct machine *machine)
{
	return __dsos__cache_build_ids(&machine->dsos.head, machine);
}

int perf_session__cache_build_ids(struct perf_session *session)
{
	struct rb_node *nd;
	int ret;

	if (no_buildid_cache)
		return 0;

	if (mkdir(buildid_dir, 0755) != 0 && errno != EEXIST)
		return -1;

	ret = machine__cache_build_ids(&session->machines.host);

	for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) {
		struct machine *pos = rb_entry(nd, struct machine, rb_node);
		ret |= machine__cache_build_ids(pos);
	}
	return ret ? -1 : 0;
}

static bool machine__read_build_ids(struct machine *machine, bool with_hits)
{
	return __dsos__read_build_ids(&machine->dsos.head, with_hits);
}

bool perf_session__read_build_ids(struct perf_session *session, bool with_hits)
{
	struct rb_node *nd;
	bool ret = machine__read_build_ids(&session->machines.host, with_hits);

	for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) {
		struct machine *pos = rb_entry(nd, struct machine, rb_node);
		ret |= machine__read_build_ids(pos, with_hits);
	}

	return ret;
}
Commit	Line	Data
7b2567c1 ACM	1	/*
	2	* build-id.c
	3	*
	4	* build-id support
	5	*
	6	* Copyright (C) 2009, 2010 Red Hat Inc.
	7	* Copyright (C) 2009, 2010 Arnaldo Carvalho de Melo <acme@redhat.com>
	8	*/
b36f19d5 ACM	9	#include "util.h"
b36f19d5 ACM	10	#include <stdio.h>
7b2567c1 ACM	11	#include "build-id.h"
	12	#include "event.h"
	13	#include "symbol.h"
	14	#include <linux/kernel.h>
591765fd	15	#include "debug.h"
d20deb64	16	#include "session.h"
45694aa7	17	#include "tool.h"
e195fac8 NK	18	#include "header.h"
e195fac8 NK	19	#include "vdso.h"
7b2567c1	20
73c5d224 NK	21
	22	static bool no_buildid_cache;
	23
54a3cf59 AV	24	int build_id__mark_dso_hit(struct perf_tool *tool __maybe_unused,
54a3cf59 AV	25	union perf_event *event,
ef89325f	26	struct perf_sample *sample,
54a3cf59 AV	27	struct perf_evsel *evsel __maybe_unused,
54a3cf59 AV	28	struct machine *machine)
7b2567c1 ACM	29	{
	30	struct addr_location al;
	31	u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
ef89325f	32	struct thread *thread = machine__findnew_thread(machine, sample->pid,
13ce34df	33	sample->tid);
7b2567c1 ACM	34
	35	if (thread == NULL) {
	36	pr_err("problem processing %d event, skipping it.\n",
	37	event->header.type);
	38	return -1;
	39	}
	40
bb871a9c	41	thread__find_addr_map(thread, cpumode, MAP__FUNCTION, sample->ip, &al);
7b2567c1 ACM	42
	43	if (al.map != NULL)
	44	al.map->dso->hit = 1;
	45
b91fc39f	46	thread__put(thread);
7b2567c1 ACM	47	return 0;
	48	}
	49
1d037ca1	50	static int perf_event__exit_del_thread(struct perf_tool *tool __maybe_unused,
d20deb64	51	union perf_event *event,
1d037ca1 IT	52	struct perf_sample *sample
1d037ca1 IT	53	__maybe_unused,
743eb868	54	struct machine *machine)
591765fd	55	{
314add6b AH	56	struct thread *thread = machine__findnew_thread(machine,
	57	event->fork.pid,
	58	event->fork.tid);
591765fd	59
8115d60c ACM	60	dump_printf("(%d:%d):(%d:%d)\n", event->fork.pid, event->fork.tid,
8115d60c ACM	61	event->fork.ppid, event->fork.ptid);
591765fd	62
b91fc39f	63	if (thread) {
5e78c69b	64	machine__remove_thread(machine, thread);
b91fc39f ACM	65	thread__put(thread);
b91fc39f ACM	66	}
591765fd ACM	67
	68	return 0;
	69	}
	70
45694aa7	71	struct perf_tool build_id__mark_dso_hit_ops = {
7b2567c1	72	.sample = build_id__mark_dso_hit,
8115d60c	73	.mmap = perf_event__process_mmap,
5c5e854b	74	.mmap2 = perf_event__process_mmap2,
f62d3f0f	75	.fork = perf_event__process_fork,
8115d60c	76	.exit = perf_event__exit_del_thread,
299c3452 SE	77	.attr = perf_event__process_attr,
299c3452 SE	78	.build_id = perf_event__process_build_id,
7b2567c1	79	};
b36f19d5	80
ebb296c2 JO	81	int build_id__sprintf(const u8 build_id, int len, char bf)
	82	{
	83	char *bid = bf;
	84	const u8 *raw = build_id;
	85	int i;
	86
	87	for (i = 0; i < len; ++i) {
	88	sprintf(bid, "%02x", *raw);
	89	++raw;
	90	bid += 2;
	91	}
	92
	93	return raw - build_id;
	94	}
	95
5cb113fd MH	96	/* asnprintf consolidates asprintf and snprintf */
	97	static int asnprintf(char *strp, size_t size, const char fmt, ...)
	98	{
	99	va_list ap;
	100	int ret;
	101
	102	if (!strp)
	103	return -EINVAL;
	104
	105	va_start(ap, fmt);
	106	if (*strp)
	107	ret = vsnprintf(*strp, size, fmt, ap);
	108	else
	109	ret = vasprintf(strp, fmt, ap);
	110	va_end(ap);
	111
	112	return ret;
	113	}
	114
	115	static char build_id__filename(const char sbuild_id, char *bf, size_t size)
	116	{
	117	char *tmp = bf;
	118	int ret = asnprintf(&bf, size, "%s/.build-id/%.2s/%s", buildid_dir,
	119	sbuild_id, sbuild_id + 2);
	120	if (ret < 0 \|\| (tmp && size < (unsigned int)ret))
	121	return NULL;
	122	return bf;
	123	}
	124
3344996e	125	char dso__build_id_filename(const struct dso dso, char *bf, size_t size)
b36f19d5	126	{
d77fac7f	127	char build_id_hex[SBUILD_ID_SIZE];
b36f19d5	128
c824c433	129	if (!dso->has_build_id)
b36f19d5 ACM	130	return NULL;
b36f19d5 ACM	131
c824c433	132	build_id__sprintf(dso->build_id, sizeof(dso->build_id), build_id_hex);
5cb113fd	133	return build_id__filename(build_id_hex, bf, size);
b36f19d5	134	}
e195fac8 NK	135
	136	#define dsos__for_each_with_build_id(pos, head) \
	137	list_for_each_entry(pos, head, node) \
	138	if (!pos->has_build_id) \
	139	continue; \
	140	else
	141
	142	static int write_buildid(const char name, size_t name_len, u8 build_id,
	143	pid_t pid, u16 misc, int fd)
	144	{
	145	int err;
	146	struct build_id_event b;
	147	size_t len;
	148
	149	len = name_len + 1;
	150	len = PERF_ALIGN(len, NAME_ALIGN);
	151
	152	memset(&b, 0, sizeof(b));
	153	memcpy(&b.build_id, build_id, BUILD_ID_SIZE);
	154	b.pid = pid;
	155	b.header.misc = misc;
	156	b.header.size = sizeof(b) + len;
	157
	158	err = writen(fd, &b, sizeof(b));
	159	if (err < 0)
	160	return err;
	161
	162	return write_padded(fd, name, name_len + 1, len);
	163	}
	164
3d39ac53	165	static int machine__write_buildid_table(struct machine *machine, int fd)
e195fac8	166	{
3d39ac53	167	int err = 0;
e195fac8 NK	168	char nm[PATH_MAX];
e195fac8 NK	169	struct dso *pos;
3d39ac53 ACM	170	u16 kmisc = PERF_RECORD_MISC_KERNEL,
	171	umisc = PERF_RECORD_MISC_USER;
	172
	173	if (!machine__is_host(machine)) {
	174	kmisc = PERF_RECORD_MISC_GUEST_KERNEL;
	175	umisc = PERF_RECORD_MISC_GUEST_USER;
	176	}
e195fac8	177
3d39ac53	178	dsos__for_each_with_build_id(pos, &machine->dsos.head) {
e195fac8 NK	179	const char *name;
	180	size_t name_len;
	181
	182	if (!pos->hit)
	183	continue;
	184
	185	if (dso__is_vdso(pos)) {
	186	name = pos->short_name;
	187	name_len = pos->short_name_len + 1;
	188	} else if (dso__is_kcore(pos)) {
	189	machine__mmap_name(machine, nm, sizeof(nm));
	190	name = nm;
	191	name_len = strlen(nm) + 1;
	192	} else {
	193	name = pos->long_name;
	194	name_len = pos->long_name_len + 1;
	195	}
	196
3d39ac53 ACM	197	err = write_buildid(name, name_len, pos->build_id, machine->pid,
3d39ac53 ACM	198	pos->kernel ? kmisc : umisc, fd);
e195fac8	199	if (err)
3d39ac53	200	break;
e195fac8 NK	201	}
e195fac8 NK	202
e195fac8 NK	203	return err;
	204	}
	205
	206	int perf_session__write_buildid_table(struct perf_session *session, int fd)
	207	{
	208	struct rb_node *nd;
	209	int err = machine__write_buildid_table(&session->machines.host, fd);
	210
	211	if (err)
	212	return err;
	213
	214	for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) {
	215	struct machine *pos = rb_entry(nd, struct machine, rb_node);
	216	err = machine__write_buildid_table(pos, fd);
	217	if (err)
	218	break;
	219	}
	220	return err;
	221	}
	222
	223	static int __dsos__hit_all(struct list_head *head)
	224	{
	225	struct dso *pos;
	226
	227	list_for_each_entry(pos, head, node)
	228	pos->hit = true;
	229
	230	return 0;
	231	}
	232
	233	static int machine__hit_all_dsos(struct machine *machine)
	234	{
3d39ac53	235	return __dsos__hit_all(&machine->dsos.head);
e195fac8 NK	236	}
	237
	238	int dsos__hit_all(struct perf_session *session)
	239	{
	240	struct rb_node *nd;
	241	int err;
	242
	243	err = machine__hit_all_dsos(&session->machines.host);
	244	if (err)
	245	return err;
	246
	247	for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) {
	248	struct machine *pos = rb_entry(nd, struct machine, rb_node);
	249
	250	err = machine__hit_all_dsos(pos);
	251	if (err)
	252	return err;
	253	}
	254
	255	return 0;
	256	}
	257
73c5d224 NK	258	void disable_buildid_cache(void)
	259	{
	260	no_buildid_cache = true;
	261	}
	262
8d8c8e4c MH	263	static char build_id_cache__dirname_from_path(const char name,
	264	bool is_kallsyms, bool is_vdso)
	265	{
	266	char realname = (char )name, *filename;
	267	bool slash = is_kallsyms \|\| is_vdso;
	268
	269	if (!slash) {
	270	realname = realpath(name, NULL);
	271	if (!realname)
	272	return NULL;
	273	}
	274
	275	if (asprintf(&filename, "%s%s%s", buildid_dir, slash ? "/" : "",
	276	is_vdso ? DSO__NAME_VDSO : realname) < 0)
	277	filename = NULL;
	278
	279	if (!slash)
	280	free(realname);
	281
	282	return filename;
	283	}
	284
	285	int build_id_cache__list_build_ids(const char *pathname,
	286	struct strlist **result)
	287	{
	288	struct strlist *list;
	289	char *dir_name;
	290	DIR *dir;
	291	struct dirent *d;
	292	int ret = 0;
	293
4a77e218	294	list = strlist__new(NULL, NULL);
8d8c8e4c MH	295	dir_name = build_id_cache__dirname_from_path(pathname, false, false);
	296	if (!list \|\| !dir_name) {
	297	ret = -ENOMEM;
	298	goto out;
	299	}
	300
	301	/* List up all dirents */
	302	dir = opendir(dir_name);
	303	if (!dir) {
	304	ret = -errno;
	305	goto out;
	306	}
	307
	308	while ((d = readdir(dir)) != NULL) {
	309	if (!strcmp(d->d_name, ".") \|\| !strcmp(d->d_name, ".."))
	310	continue;
	311	strlist__add(list, d->d_name);
	312	}
	313	closedir(dir);
	314
	315	out:
	316	free(dir_name);
	317	if (ret)
	318	strlist__delete(list);
	319	else
	320	*result = list;
	321
	322	return ret;
	323	}
	324
e35f7362 MH	325	int build_id_cache__add_s(const char sbuild_id, const char name,
e35f7362 MH	326	bool is_kallsyms, bool is_vdso)
e195fac8 NK	327	{
e195fac8 NK	328	const size_t size = PATH_MAX;
8d8c8e4c	329	char realname = NULL, filename = NULL, *dir_name = NULL,
5cb113fd	330	linkname = zalloc(size), targetname, *tmp;
8d8c8e4c	331	int err = -1;
e195fac8	332
8d8c8e4c	333	if (!is_kallsyms) {
e195fac8	334	realname = realpath(name, NULL);
8d8c8e4c MH	335	if (!realname)
	336	goto out_free;
	337	}
e195fac8	338
8d8c8e4c MH	339	dir_name = build_id_cache__dirname_from_path(name, is_kallsyms, is_vdso);
8d8c8e4c MH	340	if (!dir_name)
e195fac8 NK	341	goto out_free;
e195fac8 NK	342
8d8c8e4c	343	if (mkdir_p(dir_name, 0755))
e195fac8 NK	344	goto out_free;
e195fac8 NK	345
8d8c8e4c MH	346	if (asprintf(&filename, "%s/%s", dir_name, sbuild_id) < 0) {
	347	filename = NULL;
	348	goto out_free;
	349	}
e195fac8 NK	350
	351	if (access(filename, F_OK)) {
	352	if (is_kallsyms) {
	353	if (copyfile("/proc/kallsyms", filename))
	354	goto out_free;
0635b0f7 MV	355	} else if (link(realname, filename) && errno != EEXIST &&
0635b0f7 MV	356	copyfile(name, filename))
e195fac8 NK	357	goto out_free;
	358	}
	359
5cb113fd MH	360	if (!build_id__filename(sbuild_id, linkname, size))
	361	goto out_free;
	362	tmp = strrchr(linkname, '/');
	363	*tmp = '\0';
e195fac8 NK	364
	365	if (access(linkname, X_OK) && mkdir_p(linkname, 0755))
	366	goto out_free;
	367
5cb113fd	368	*tmp = '/';
e35f7362	369	targetname = filename + strlen(buildid_dir) - 5;
e195fac8 NK	370	memcpy(targetname, "../..", 5);
	371
	372	if (symlink(targetname, linkname) == 0)
	373	err = 0;
	374	out_free:
	375	if (!is_kallsyms)
	376	free(realname);
	377	free(filename);
8d8c8e4c	378	free(dir_name);
e195fac8 NK	379	free(linkname);
	380	return err;
	381	}
	382
	383	static int build_id_cache__add_b(const u8 *build_id, size_t build_id_size,
e35f7362 MH	384	const char *name, bool is_kallsyms,
e35f7362 MH	385	bool is_vdso)
e195fac8	386	{
d77fac7f	387	char sbuild_id[SBUILD_ID_SIZE];
e195fac8 NK	388
	389	build_id__sprintf(build_id, build_id_size, sbuild_id);
	390
e35f7362	391	return build_id_cache__add_s(sbuild_id, name, is_kallsyms, is_vdso);
e195fac8 NK	392	}
e195fac8 NK	393
a50d11a1 MH	394	bool build_id_cache__cached(const char *sbuild_id)
	395	{
	396	bool ret = false;
	397	char *filename = build_id__filename(sbuild_id, NULL, 0);
	398
	399	if (filename && !access(filename, F_OK))
	400	ret = true;
	401	free(filename);
	402
	403	return ret;
	404	}
	405
e35f7362	406	int build_id_cache__remove_s(const char *sbuild_id)
e195fac8 NK	407	{
	408	const size_t size = PATH_MAX;
	409	char *filename = zalloc(size),
5cb113fd	410	linkname = zalloc(size), tmp;
e195fac8 NK	411	int err = -1;
	412
	413	if (filename == NULL \|\| linkname == NULL)
	414	goto out_free;
	415
5cb113fd MH	416	if (!build_id__filename(sbuild_id, linkname, size))
5cb113fd MH	417	goto out_free;
e195fac8 NK	418
	419	if (access(linkname, F_OK))
	420	goto out_free;
	421
	422	if (readlink(linkname, filename, size - 1) < 0)
	423	goto out_free;
	424
	425	if (unlink(linkname))
	426	goto out_free;
	427
	428	/*
	429	* Since the link is relative, we must make it absolute:
	430	*/
5cb113fd MH	431	tmp = strrchr(linkname, '/') + 1;
5cb113fd MH	432	snprintf(tmp, size - (tmp - linkname), "%s", filename);
e195fac8 NK	433
	434	if (unlink(linkname))
	435	goto out_free;
	436
	437	err = 0;
	438	out_free:
	439	free(filename);
	440	free(linkname);
	441	return err;
	442	}
	443
e35f7362	444	static int dso__cache_build_id(struct dso dso, struct machine machine)
e195fac8 NK	445	{
	446	bool is_kallsyms = dso->kernel && dso->long_name[0] != '/';
	447	bool is_vdso = dso__is_vdso(dso);
	448	const char *name = dso->long_name;
	449	char nm[PATH_MAX];
	450
	451	if (dso__is_kcore(dso)) {
	452	is_kallsyms = true;
	453	machine__mmap_name(machine, nm, sizeof(nm));
	454	name = nm;
	455	}
	456	return build_id_cache__add_b(dso->build_id, sizeof(dso->build_id), name,
e35f7362	457	is_kallsyms, is_vdso);
e195fac8 NK	458	}
	459
	460	static int __dsos__cache_build_ids(struct list_head *head,
e35f7362	461	struct machine *machine)
e195fac8 NK	462	{
	463	struct dso *pos;
	464	int err = 0;
	465
	466	dsos__for_each_with_build_id(pos, head)
e35f7362	467	if (dso__cache_build_id(pos, machine))
e195fac8 NK	468	err = -1;
	469
	470	return err;
	471	}
	472
e35f7362	473	static int machine__cache_build_ids(struct machine *machine)
e195fac8	474	{
3d39ac53	475	return __dsos__cache_build_ids(&machine->dsos.head, machine);
e195fac8 NK	476	}
	477
	478	int perf_session__cache_build_ids(struct perf_session *session)
	479	{
	480	struct rb_node *nd;
	481	int ret;
e195fac8	482
73c5d224 NK	483	if (no_buildid_cache)
	484	return 0;
	485
498922ad	486	if (mkdir(buildid_dir, 0755) != 0 && errno != EEXIST)
e195fac8 NK	487	return -1;
e195fac8 NK	488
e35f7362	489	ret = machine__cache_build_ids(&session->machines.host);
e195fac8 NK	490
	491	for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) {
	492	struct machine *pos = rb_entry(nd, struct machine, rb_node);
e35f7362	493	ret \|= machine__cache_build_ids(pos);
e195fac8 NK	494	}
	495	return ret ? -1 : 0;
	496	}
	497
	498	static bool machine__read_build_ids(struct machine *machine, bool with_hits)
	499	{
3d39ac53	500	return __dsos__read_build_ids(&machine->dsos.head, with_hits);
e195fac8 NK	501	}
	502
	503	bool perf_session__read_build_ids(struct perf_session *session, bool with_hits)
	504	{
	505	struct rb_node *nd;
	506	bool ret = machine__read_build_ids(&session->machines.host, with_hits);
	507
	508	for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) {
	509	struct machine *pos = rb_entry(nd, struct machine, rb_node);
	510	ret \|= machine__read_build_ids(pos, with_hits);
	511	}
	512
	513	return ret;
	514	}