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// SPDX-License-Identifier: GPL-2.0
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/epoll.h>
#include <util/symbol.h>
#include <linux/filter.h>
#include "tests.h"
#include "debug.h"
#include "probe-file.h"
#include "build-id.h"
#include "util.h"
/* To test SDT event, we need libelf support to scan elf binary */
#if defined(HAVE_SDT_EVENT) && defined(HAVE_LIBELF_SUPPORT)
#include <sys/sdt.h>
static int target_function(void)
{
DTRACE_PROBE(perf, test_target);
return TEST_OK;
}
/* Copied from builtin-buildid-cache.c */
static int build_id_cache__add_file(const char *filename)
{
char sbuild_id[SBUILD_ID_SIZE];
struct build_id bid;
int err;
err = filename__read_build_id(filename, &bid);
if (err < 0) {
pr_debug("Failed to read build id of %s\n", filename);
return err;
}
build_id__sprintf(&bid, sbuild_id);
err = build_id_cache__add_s(sbuild_id, filename, NULL, false, false);
if (err < 0)
pr_debug("Failed to add build id cache of %s\n", filename);
return err;
}
static char *get_self_path(void)
{
char *buf = calloc(PATH_MAX, sizeof(char));
if (buf && readlink("/proc/self/exe", buf, PATH_MAX - 1) < 0) {
pr_debug("Failed to get correct path of perf\n");
free(buf);
return NULL;
}
return buf;
}
static int search_cached_probe(const char *target,
const char *group, const char *event)
{
struct probe_cache *cache = probe_cache__new(target, NULL);
int ret = 0;
if (!cache) {
pr_debug("Failed to open probe cache of %s\n", target);
return -EINVAL;
}
if (!probe_cache__find_by_name(cache, group, event)) {
pr_debug("Failed to find %s:%s in the cache\n", group, event);
ret = -ENOENT;
}
probe_cache__delete(cache);
return ret;
}
static int test__sdt_event(struct test_suite *test __maybe_unused, int subtests __maybe_unused)
{
int ret = TEST_FAIL;
char __tempdir[] = "./test-buildid-XXXXXX";
char *tempdir = NULL, *myself = get_self_path();
if (myself == NULL || mkdtemp(__tempdir) == NULL) {
pr_debug("Failed to make a tempdir for build-id cache\n");
goto error;
}
/* Note that buildid_dir must be an absolute path */
tempdir = realpath(__tempdir, NULL);
if (tempdir == NULL)
goto error_rmdir;
/* At first, scan itself */
set_buildid_dir(tempdir);
if (build_id_cache__add_file(myself) < 0)
goto error_rmdir;
/* Open a cache and make sure the SDT is stored */
if (search_cached_probe(myself, "sdt_perf", "test_target") < 0)
goto error_rmdir;
/* TBD: probing on the SDT event and collect logs */
/* Call the target and get an event */
ret = target_function();
error_rmdir:
/* Cleanup temporary buildid dir */
rm_rf(__tempdir);
error:
free(tempdir);
free(myself);
return ret;
}
#else
static int test__sdt_event(struct test_suite *test __maybe_unused, int subtests __maybe_unused)
{
pr_debug("Skip SDT event test because SDT support is not compiled\n");
return TEST_SKIP;
}
#endif
DEFINE_SUITE("Probe SDT events", sdt_event);
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