[PATCH 68/86] perf header: Revamp do_write()

Arnaldo Carvalho de Melo
2017-07-19T14:36:37Z

From: David Carrillo-Cisneros <davidcc@google.com>

Now that writen takes a const buffer, use it in do_write instead of
duplicating its functionality.

Export do_write to use it consistently in header.c and build_id.c .

Signed-off-by: David Carrillo-Cisneros <davidcc@google.com>
Acked-by: David Ahern <dsahern@gmail.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: He Kuang <hekuang@huawei.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Turner <pjt@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Simon Que <sque@chromium.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/r/20170718042549.145161-6-davidcc@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/util/build-id.c | 2 +-
tools/perf/util/header.c | 14 +++++---------
tools/perf/util/header.h | 2 ++
3 files changed, 8 insertions(+), 10 deletions(-)

diff --git a/tools/perf/util/build-id.c b/tools/perf/util/build-id.c
index e9665150e9b1..4baa5329439f 100644
--- a/tools/perf/util/build-id.c
+++ b/tools/perf/util/build-id.c
@@ -304,7 +304,7 @@ static int write_buildid(const char *name, size_t name_len, u8 *build_id,
b.header.misc = misc;
b.header.size = sizeof(b) + len;

- err = writen(fd, &b, sizeof(b));
+ err = do_write(fd, &b, sizeof(b));
if (err < 0)
return err;

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 8dda19b68ac4..954f0ef8e712 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -75,17 +75,13 @@ bool perf_header__has_feat(const struct perf_header *header, int feat)
}

/* Return: 0 if succeded, -ERR if failed. */
-static int do_write(int fd, const void *buf, size_t size)
+int do_write(int fd, const void *buf, size_t size)
{
- while (size) {
- int ret = write(fd, buf, size);
-
- if (ret < 0)
- return -errno;
+ ssize_t ret;

- size -= ret;
- buf += ret;
- }
+ ret = writen(fd, buf, size);
+ if (ret != (ssize_t)size)
+ return ret < 0 ? (int)ret : -1;

return 0;
}
diff --git a/tools/perf/util/header.h b/tools/perf/util/header.h
index d30109b421ee..e98489c8bba7 100644
--- a/tools/perf/util/header.h
+++ b/tools/perf/util/header.h
@@ -144,6 +144,8 @@ bool is_perf_magic(u64 magic);

#define NAME_ALIGN 64

+int do_write(int fd, const void *buf, size_t size);
+
int write_padded(int fd, const void *bf, size_t count, size_t count_aligned);

/*
--
2.9.4