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Linux/tools/perf/tests/sdt.c

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

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