Commit-ID: 94816add0005595ea33fc8456519be582330401e
Gitweb: https://git.kernel.org/tip/94816add0005595ea33fc8456519be582330401e
Author: Andi Kleen <ak@xxxxxxxxxxxxxxx>
AuthorDate: Sun, 24 Feb 2019 07:37:19 -0800
Committer: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Mon, 25 Feb 2019 10:58:28 -0300
perf tools: Add perf_exe() helper to find perf binary
Also convert one existing user.
Signed-off-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Acked-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Stephane Eranian <eranian@xxxxxxxxxx>
Link: http://lkml.kernel.org/r/20190224153722.27020-9-andi@xxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
tools/perf/util/header.c | 12 +++---------
tools/perf/util/util.c | 10 ++++++++++
tools/perf/util/util.h | 2 ++
3 files changed, 15 insertions(+), 9 deletions(-)
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index a2323d777dae..01b324c275b9 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -527,17 +527,11 @@ static int write_event_desc(struct feat_fd *ff,
static int write_cmdline(struct feat_fd *ff,
struct perf_evlist *evlist __maybe_unused)
{
- char buf[MAXPATHLEN];
- u32 n;
- int i, ret;
+ char pbuf[MAXPATHLEN], *buf;
+ int i, ret, n;
/* actual path to perf binary */
- ret = readlink("/proc/self/exe", buf, sizeof(buf) - 1);
- if (ret <= 0)
- return -1;
-
- /* readlink() does not add null termination */
- buf[ret] = '\0';
+ buf = perf_exe(pbuf, MAXPATHLEN);
/* account for binary path */
n = perf_env.nr_cmdline + 1;
diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c
index 706818693086..d388f80d8703 100644
--- a/tools/perf/util/util.c
+++ b/tools/perf/util/util.c
@@ -568,3 +568,13 @@ out:
return tip;
}
+
+char *perf_exe(char *buf, int len)
+{
+ int n = readlink("/proc/self/exe", buf, len);
+ if (n > 0) {
+ buf[n] = 0;
+ return buf;
+ }
+ return strcpy(buf, "perf");
+}
diff --git a/tools/perf/util/util.h b/tools/perf/util/util.h
index 01c538027c6f..09c1b0f91f65 100644
--- a/tools/perf/util/util.h
+++ b/tools/perf/util/util.h
@@ -77,6 +77,8 @@ extern bool perf_singlethreaded;
void perf_set_singlethreaded(void);
void perf_set_multithreaded(void);
+char *perf_exe(char *buf, int len);
+
#ifndef O_CLOEXEC
#ifdef __sparc__
#define O_CLOEXEC 0x400000
|