Messages in this thread Patch in this message | | | From | James Clark <> | Subject | [PATCH v2 4/7] perf pmu: Add function to check if a pmu file exists | Date | Thu, 22 Dec 2022 16:03:24 +0000 |
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From: German Gomez <german.gomez@arm.com>
Add a utility function perf_pmu__file_exists() to check if a given pmu file exists in the sysfs filesystem.
Signed-off-by: German Gomez <german.gomez@arm.com> Signed-off-by: James Clark <james.clark@arm.com> --- tools/perf/util/pmu.c | 14 ++++++++++++++ tools/perf/util/pmu.h | 2 ++ 2 files changed, 16 insertions(+)
diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c index 15b852b3c401..b72b2d892949 100644 --- a/tools/perf/util/pmu.c +++ b/tools/perf/util/pmu.c @@ -1739,6 +1739,20 @@ int perf_pmu__scan_file(struct perf_pmu *pmu, const char *name, const char *fmt, return ret; } +bool perf_pmu__file_exists(struct perf_pmu *pmu, const char *name) +{ + char path[PATH_MAX]; + struct stat statbuf; + + if (!perf_pmu__pathname_scnprintf(path, PATH_MAX, pmu->name, name)) + return false; + + if (!file_available(path)) + return false; + + return stat(path, &statbuf) == 0; +} + static int perf_pmu__new_caps(struct list_head *list, char *name, char *value) { struct perf_pmu_caps *caps = zalloc(sizeof(*caps)); diff --git a/tools/perf/util/pmu.h b/tools/perf/util/pmu.h index 8f39e2d17fb1..c1d138fe9602 100644 --- a/tools/perf/util/pmu.h +++ b/tools/perf/util/pmu.h @@ -230,6 +230,8 @@ bool pmu_have_event(const char *pname, const char *name); int perf_pmu__scan_file(struct perf_pmu *pmu, const char *name, const char *fmt, ...) __scanf(3, 4); +bool perf_pmu__file_exists(struct perf_pmu *pmu, const char *name); + int perf_pmu__test(void); struct perf_event_attr *perf_pmu__get_default_config(struct perf_pmu *pmu); -- 2.25.1
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