[PATCH 1/3] perf tools: Add perf_data_file__write interface

[Jiri Olsa]

Adding perf_data_file__write interface to centralize
output to files. The function prototype is:

  ssize_t perf_data_file__write(struct perf_data_file *file,
                                void *buf, size_t size);

Returns number of bytes written or -1 in case of error.

NOTE Indenting 'struct perf_data_file' members,
     no functional change done.

Signed-off-by: Jiri Olsa <jo...@redhat.com>
Cc: Ingo Molnar <mi...@kernel.org>
Cc: Frederic Weisbecker <fweis...@gmail.com>
Cc: Peter Zijlstra <pet...@infradead.org>
Cc: Namhyung Kim <namhy...@kernel.org>
Cc: Mike Galbraith <efa...@gmx.de>
Cc: Stephane Eranian <eran...@google.com>
Cc: David Ahern <dsah...@gmail.com>
Cc: Adrian Hunter <adrian.hun...@intel.com>
---
 tools/perf/util/data.c | 20 ++++++++++++++++++++
 tools/perf/util/data.h | 15 ++++++++-------
 2 files changed, 28 insertions(+), 7 deletions(-)

diff --git a/tools/perf/util/data.c b/tools/perf/util/data.c
index 7d09faf..cce1256 100644
--- a/tools/perf/util/data.c
+++ b/tools/perf/util/data.c
@@ -118,3 +118,23 @@ void perf_data_file__close(struct perf_data_file *file)
 {
        close(file->fd);
 }
+
+ssize_t perf_data_file__write(struct perf_data_file *file,
+                             void *buf, size_t size)
+{
+       ssize_t total = size;
+
+       while (size) {
+               ssize_t ret = write(file->fd, buf, size);
+
+               if (ret < 0) {
+                       pr_err("failed to write perf data, error: %m\n");
+                       return -1;
+               }
+
+               size -= ret;
+               buf  += ret;
+       }
+
+       return total;
+}
diff --git a/tools/perf/util/data.h b/tools/perf/util/data.h
index 8c2df80..02c53dc 100644
--- a/tools/perf/util/data.h
+++ b/tools/perf/util/data.h
@@ -9,12 +9,12 @@ enum perf_data_mode {
 };
 
 struct perf_data_file {
-       const char *path;
-       int fd;
-       bool is_pipe;
-       bool force;
-       unsigned long size;
-       enum perf_data_mode mode;
+       const char              *path;
+       int                      fd;
+       bool                     is_pipe;
+       bool                     force;
+       unsigned long            size;
+       enum perf_data_mode      mode;
 };
 
 static inline bool perf_data_file__is_read(struct perf_data_file *file)
@@ -44,5 +44,6 @@ static inline unsigned long perf_data_file__size(struct 
perf_data_file *file)
 
 int perf_data_file__open(struct perf_data_file *file);
 void perf_data_file__close(struct perf_data_file *file);
-
+ssize_t perf_data_file__write(struct perf_data_file *file,
+                             void *buf, size_t size);
 #endif /* __PERF_DATA_H */
-- 
1.8.3.1

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