perf data: Add perf_data__(create_dir|close_dir) functions

Add perf_data__create_dir() to create nr files inside 'struct perf_data'
path directory:

  int perf_data__create_dir(struct perf_data *data, int nr);

and function to close that data:

  void perf_data__close_dir(struct perf_data *data);

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexey Budankov <alexey.budankov@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/20190224190656.30163-9-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 47 insertions, 0 deletions

diff --git a/tools/perf/util/data.c b/tools/perf/util/data.c
index d008c3973012..005b3909d1dc 100644
--- a/tools/perf/util/data.c
+++ b/tools/perf/util/data.c
@@ -7,11 +7,58 @@
 #include <fcntl.h>
 #include <unistd.h>
 #include <string.h>
+#include <asm/bug.h>
 
 #include "data.h"
 #include "util.h"
 #include "debug.h"
 
+static void close_dir(struct perf_data_file *files, int nr)
+{
+        while (--nr >= 1) {
+                close(files[nr].fd);
+                free(files[nr].path);
+        }
+        free(files);
+}
+
+void perf_data__close_dir(struct perf_data *data)
+{
+        close_dir(data->dir.files, data->dir.nr);
+}
+
+int perf_data__create_dir(struct perf_data *data, int nr)
+{
+        struct perf_data_file *files = NULL;
+        int i, ret = -1;
+
+        files = zalloc(nr * sizeof(*files));
+        if (!files)
+                return -ENOMEM;
+
+        data->dir.files = files;
+        data->dir.nr    = nr;
+
+        for (i = 0; i < nr; i++) {
+                struct perf_data_file *file = &files[i];
+
+                if (asprintf(&file->path, "%s/data.%d", data->path, i) < 0)
+                        goto out_err;
+
+                ret = open(file->path, O_RDWR|O_CREAT|O_TRUNC, S_IRUSR|S_IWUSR);
+                if (ret < 0)
+                        goto out_err;
+
+                file->fd = ret;
+        }
+
+        return 0;
+
+out_err:
+        close_dir(files, i);
+        return ret;
+}
+
 static bool check_pipe(struct perf_data *data)
 {
         struct stat st;