linux-kernel - [PATCH v2 2/9] tools lib api fs tracing

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Message-Id: <20221114181251.2683871-3-irogers@google.com>
Date:   Mon, 14 Nov 2022 10:12:44 -0800
From:   Ian Rogers <irogers@...gle.com>
To:     Weilin Wang <weilin.wang@...el.com>,
        Perry Taylor <perry.taylor@...el.com>,
        Caleb Biggers <caleb.biggers@...el.com>,
        Leo Yan <leo.yan@...aro.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Sandipan Das <sandipan.das@....com>,
        Kajol Jain <kjain@...ux.ibm.com>,
        Zhengjun Xing <zhengjun.xing@...ux.intel.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Ravi Bangoria <ravi.bangoria@....com>,
        Xin Gao <gaoxin@...rlc.com>, Rob Herring <robh@...nel.org>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org
Cc:     Stephane Eranian <eranian@...gle.com>,
        Ian Rogers <irogers@...gle.com>
Subject: [PATCH v2 2/9] tools lib api fs tracing_path: Add scandir alphasort

tracing_events__opendir allows iteration over files in
<debugfs>/tracing/events but with an arbitrary sort order. Add a
scandir alternative where the results are alphabetically sorted.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/lib/api/fs/tracing_path.c | 16 ++++++++++++++++
 tools/lib/api/fs/tracing_path.h |  1 +
 2 files changed, 17 insertions(+)

diff --git a/tools/lib/api/fs/tracing_path.c b/tools/lib/api/fs/tracing_path.c
index 5afb11b30fca..b8e457c841ab 100644
--- a/tools/lib/api/fs/tracing_path.c
+++ b/tools/lib/api/fs/tracing_path.c
@@ -113,6 +113,22 @@ DIR *tracing_events__opendir(void)
 	return dir;
 }
 
+int tracing_events__scandir_alphasort(struct dirent ***namelist)
+{
+	char *path = get_tracing_file("events");
+	int ret;
+
+	if (!path) {
+		*namelist = NULL;
+		return 0;
+	}
+
+	ret = scandir(path, namelist, NULL, alphasort);
+	put_events_file(path);
+
+	return ret;
+}
+
 int tracing_path__strerror_open_tp(int err, char *buf, size_t size,
 				   const char *sys, const char *name)
 {
diff --git a/tools/lib/api/fs/tracing_path.h b/tools/lib/api/fs/tracing_path.h
index a19136b086dc..fc6347c11deb 100644
--- a/tools/lib/api/fs/tracing_path.h
+++ b/tools/lib/api/fs/tracing_path.h
@@ -6,6 +6,7 @@
 #include <dirent.h>
 
 DIR *tracing_events__opendir(void);
+int tracing_events__scandir_alphasort(struct dirent ***namelist);
 
 void tracing_path_set(const char *mountpoint);
 const char *tracing_path_mount(void);
-- 
2.38.1.431.g37b22c650d-goog