linux-kernel - [PATCH 06/17] perf data: Add perf_data__open_dir

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Message-Id: <20190221094145.9151-7-jolsa@kernel.org>
Date:   Thu, 21 Feb 2019 10:41:34 +0100
From:   Jiri Olsa <jolsa@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Stephane Eranian <eranian@...gle.com>,
        Alexey Budankov <alexey.budankov@...ux.intel.com>
Subject: [PATCH 06/17] perf data: Add perf_data__open_dir_data function

Adding perf_data__open_dir_data to open files inside
struct perf_data path directory:
   static int perf_data__open_dir(struct perf_data *data);

Link: http://lkml.kernel.org/n/tip-sv97z5mh9j273mz2cthzaq4n@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
 tools/perf/util/data.c | 59 ++++++++++++++++++++++++++++++++++++++++++
 tools/perf/util/data.h |  1 +
 2 files changed, 60 insertions(+)

diff --git a/tools/perf/util/data.c b/tools/perf/util/data.c
index 7f13fbd9c043..d9e766a16e70 100644
--- a/tools/perf/util/data.c
+++ b/tools/perf/util/data.c
@@ -8,6 +8,8 @@
 #include <unistd.h>
 #include <string.h>
 #include <asm/bug.h>
+#include <sys/types.h>
+#include <dirent.h>
 
 #include "data.h"
 #include "util.h"
@@ -59,6 +61,63 @@ int perf_data__create_dir(struct perf_data *data, int nr)
 	return ret;
 }
 
+int perf_data__open_dir(struct perf_data *data)
+{
+	struct perf_data_file *files = NULL;
+	struct dirent *dent;
+	int ret = -1;
+	DIR *dir;
+	int nr = 0;
+
+	dir = opendir(data->path);
+	if (!dir)
+		return -EINVAL;
+
+	while ((dent = readdir(dir)) != NULL) {
+		struct perf_data_file *file;
+		char path[PATH_MAX];
+		struct stat st;
+
+		snprintf(path, sizeof(path), "%s/%s", data->path, dent->d_name);
+		if (stat(path, &st))
+			continue;
+
+		if (!S_ISREG(st.st_mode) || strncmp(dent->d_name, "data", 4))
+			continue;
+
+		ret = -ENOMEM;
+
+		file = realloc(files, (nr + 1) * sizeof(*files));
+		if (!file)
+			goto out_err;
+
+		files = file;
+		file = &files[nr++];
+
+		file->path = strdup(path);
+		if (!file->path)
+			goto out_err;
+
+		ret = open(file->path, O_RDONLY);
+		if (ret < 0)
+			goto out_err;
+
+		file->fd = ret;
+		file->size = st.st_size;
+	}
+
+	if (!files)
+		return -EINVAL;
+
+	data->dir.files = files;
+	data->dir.nr    = nr;
+	return 0;
+
+out_err:
+	close_dir(files, nr);
+	return ret;
+}
+
 static bool check_pipe(struct perf_data *data)
 {
 	struct stat st;
diff --git a/tools/perf/util/data.h b/tools/perf/util/data.h
index 2d0d015a7d4d..14b47be2bd69 100644
--- a/tools/perf/util/data.h
+++ b/tools/perf/util/data.h
@@ -71,5 +71,6 @@ int perf_data__switch(struct perf_data *data,
 			   size_t pos, bool at_exit);
 
 int perf_data__create_dir(struct perf_data *data, int nr);
+int perf_data__open_dir(struct perf_data *data);
 void perf_data__close_dir(struct perf_data *data);
 #endif /* __PERF_DATA_H */
-- 
2.17.2