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