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Linux/tools/perf/tests/sdt.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 #include <errno.h>
  3 #include <stdio.h>
  4 #include <sys/epoll.h>
  5 #include <util/evlist.h>
  6 #include <linux/filter.h>
  7 #include "tests.h"
  8 #include "debug.h"
  9 #include "probe-file.h"
 10 #include "build-id.h"
 11 
 12 /* To test SDT event, we need libelf support to scan elf binary */
 13 #if defined(HAVE_SDT_EVENT) && defined(HAVE_LIBELF_SUPPORT)
 14 
 15 #include <sys/sdt.h>
 16 
 17 static int target_function(void)
 18 {
 19         DTRACE_PROBE(perf, test_target);
 20         return TEST_OK;
 21 }
 22 
 23 /* Copied from builtin-buildid-cache.c */
 24 static int build_id_cache__add_file(const char *filename)
 25 {
 26         char sbuild_id[SBUILD_ID_SIZE];
 27         u8 build_id[BUILD_ID_SIZE];
 28         int err;
 29 
 30         err = filename__read_build_id(filename, &build_id, sizeof(build_id));
 31         if (err < 0) {
 32                 pr_debug("Failed to read build id of %s\n", filename);
 33                 return err;
 34         }
 35 
 36         build_id__sprintf(build_id, sizeof(build_id), sbuild_id);
 37         err = build_id_cache__add_s(sbuild_id, filename, NULL, false, false);
 38         if (err < 0)
 39                 pr_debug("Failed to add build id cache of %s\n", filename);
 40         return err;
 41 }
 42 
 43 static char *get_self_path(void)
 44 {
 45         char *buf = calloc(PATH_MAX, sizeof(char));
 46 
 47         if (buf && readlink("/proc/self/exe", buf, PATH_MAX - 1) < 0) {
 48                 pr_debug("Failed to get correct path of perf\n");
 49                 free(buf);
 50                 return NULL;
 51         }
 52         return buf;
 53 }
 54 
 55 static int search_cached_probe(const char *target,
 56                                const char *group, const char *event)
 57 {
 58         struct probe_cache *cache = probe_cache__new(target, NULL);
 59         int ret = 0;
 60 
 61         if (!cache) {
 62                 pr_debug("Failed to open probe cache of %s\n", target);
 63                 return -EINVAL;
 64         }
 65 
 66         if (!probe_cache__find_by_name(cache, group, event)) {
 67                 pr_debug("Failed to find %s:%s in the cache\n", group, event);
 68                 ret = -ENOENT;
 69         }
 70         probe_cache__delete(cache);
 71 
 72         return ret;
 73 }
 74 
 75 int test__sdt_event(struct test *test __maybe_unused, int subtests __maybe_unused)
 76 {
 77         int ret = TEST_FAIL;
 78         char __tempdir[] = "./test-buildid-XXXXXX";
 79         char *tempdir = NULL, *myself = get_self_path();
 80 
 81         if (myself == NULL || mkdtemp(__tempdir) == NULL) {
 82                 pr_debug("Failed to make a tempdir for build-id cache\n");
 83                 goto error;
 84         }
 85         /* Note that buildid_dir must be an absolute path */
 86         tempdir = realpath(__tempdir, NULL);
 87         if (tempdir == NULL)
 88                 goto error_rmdir;
 89 
 90         /* At first, scan itself */
 91         set_buildid_dir(tempdir);
 92         if (build_id_cache__add_file(myself) < 0)
 93                 goto error_rmdir;
 94 
 95         /* Open a cache and make sure the SDT is stored */
 96         if (search_cached_probe(myself, "sdt_perf", "test_target") < 0)
 97                 goto error_rmdir;
 98 
 99         /* TBD: probing on the SDT event and collect logs */
100 
101         /* Call the target and get an event */
102         ret = target_function();
103 
104 error_rmdir:
105         /* Cleanup temporary buildid dir */
106         rm_rf(__tempdir);
107 error:
108         free(tempdir);
109         free(myself);
110         return ret;
111 }
112 #else
113 int test__sdt_event(struct test *test __maybe_unused, int subtests __maybe_unused)
114 {
115         pr_debug("Skip SDT event test because SDT support is not compiled\n");
116         return TEST_SKIP;
117 }
118 #endif
119 

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