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Message-ID: <tip-bbbab191c2c474d183e93799d008b412e97f5936@git.kernel.org>
Date: Mon, 8 Oct 2018 22:33:10 -0700
From: "tip-bot for Steven Rostedt (VMware)" <tipbot@...or.com>
To: linux-tip-commits@...r.kernel.org
Cc: tz.stoyanov@...il.com, tstoyanov@...are.com, jolsa@...hat.com,
rostedt@...dmis.org, tglx@...utronix.de,
linux-kernel@...r.kernel.org, mingo@...nel.org, hpa@...or.com,
acme@...hat.com, linux-trace-devel@...r.kernel.org,
namhyung@...nel.org
Subject: [tip:perf/core] tools lib traceevent: Separate out tep_strerror()
for strerror_r() issues
Commit-ID: bbbab191c2c474d183e93799d008b412e97f5936
Gitweb: https://git.kernel.org/tip/bbbab191c2c474d183e93799d008b412e97f5936
Author: Steven Rostedt (VMware) <rostedt@...dmis.org>
AuthorDate: Fri, 5 Oct 2018 12:18:16 -0400
Committer: Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Mon, 8 Oct 2018 14:30:45 -0300
tools lib traceevent: Separate out tep_strerror() for strerror_r() issues
While working on having PowerTop use libtracevent as a shared object
library, Tzvetomir hit "str_error_r not defined". This was added by commit
c3cec9e68f12d ("tools lib traceevent: Use str_error_r()") because
strerror_r() has two definitions, where one is GNU specific, and the other
is XSI complient. The strerror_r() is in a wrapper str_error_r() to keep the
code from having to worry about which compiler is being used.
The problem is that str_error_r() is external to libtraceevent, and not part
of the library. If it is used as a shared object then the tools using it
will need to define that function. I do not want that function defined in
libtraceevent itself, as it is out of scope for that library.
As there's only a single instance of this call, and its in the traceevent
library's own tep_strerror() function, we can copy what was done in perf,
and create yet another external file that undefs _GNU_SOURCE to use the more
portable version of the function. We don't need to worry about the errors
that strerror_r() returns. If the buffer isn't big enough, we simply
truncate it.
Reported-by: Tzvetomir Stoyanov <tstoyanov@...are.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Tzvetomir Stoyanov (VMware) <tz.stoyanov@...il.com>
Cc: linux trace devel <linux-trace-devel@...r.kernel.org>
Link: http://lkml.kernel.org/r/20181005121816.484e654f@gandalf.local.home
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
tools/lib/traceevent/Build | 1 +
tools/lib/traceevent/event-parse.c | 30 ----------------
.../{str_error_r.c => traceevent/tep_strerror.c} | 40 ++++++++++++++++++----
3 files changed, 34 insertions(+), 37 deletions(-)
diff --git a/tools/lib/traceevent/Build b/tools/lib/traceevent/Build
index c681d0575d16..0050c145d806 100644
--- a/tools/lib/traceevent/Build
+++ b/tools/lib/traceevent/Build
@@ -4,6 +4,7 @@ libtraceevent-y += trace-seq.o
libtraceevent-y += parse-filter.o
libtraceevent-y += parse-utils.o
libtraceevent-y += kbuffer-parse.o
+libtraceevent-y += tep_strerror.o
plugin_jbd2-y += plugin_jbd2.o
plugin_hrtimer-y += plugin_hrtimer.o
diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c
index 7980fc6c3bac..233179a712d6 100644
--- a/tools/lib/traceevent/event-parse.c
+++ b/tools/lib/traceevent/event-parse.c
@@ -18,7 +18,6 @@
#include <errno.h>
#include <stdint.h>
#include <limits.h>
-#include <linux/string.h>
#include <linux/time64.h>
#include <netinet/in.h>
@@ -6201,35 +6200,6 @@ enum tep_errno tep_parse_event(struct tep_handle *pevent, const char *buf,
return __parse_event(pevent, &event, buf, size, sys);
}
-#undef _PE
-#define _PE(code, str) str
-static const char * const tep_error_str[] = {
- TEP_ERRORS
-};
-#undef _PE
-
-int tep_strerror(struct tep_handle *pevent __maybe_unused,
- enum tep_errno errnum, char *buf, size_t buflen)
-{
- int idx;
- const char *msg;
-
- if (errnum >= 0) {
- str_error_r(errnum, buf, buflen);
- return 0;
- }
-
- if (errnum <= __TEP_ERRNO__START ||
- errnum >= __TEP_ERRNO__END)
- return -1;
-
- idx = errnum - __TEP_ERRNO__START - 1;
- msg = tep_error_str[idx];
- snprintf(buf, buflen, "%s", msg);
-
- return 0;
-}
-
int get_field_val(struct trace_seq *s, struct tep_format_field *field,
const char *name, struct tep_record *record,
unsigned long long *val, int err)
diff --git a/tools/lib/str_error_r.c b/tools/lib/traceevent/tep_strerror.c
similarity index 54%
copy from tools/lib/str_error_r.c
copy to tools/lib/traceevent/tep_strerror.c
index 6aad8308a0ac..4ac26445b2f6 100644
--- a/tools/lib/str_error_r.c
+++ b/tools/lib/traceevent/tep_strerror.c
@@ -1,8 +1,16 @@
-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: LGPL-2.1
#undef _GNU_SOURCE
#include <string.h>
#include <stdio.h>
-#include <linux/string.h>
+
+#include "event-parse.h"
+
+#undef _PE
+#define _PE(code, str) str
+static const char * const tep_error_str[] = {
+ TEP_ERRORS
+};
+#undef _PE
/*
* The tools so far have been using the strerror_r() GNU variant, that returns
@@ -18,10 +26,28 @@
* interface, but uses the portable XSI variant of strerror_r(), so that users
* rest asured that the provided buffer is used and it is what is returned.
*/
-char *str_error_r(int errnum, char *buf, size_t buflen)
+int tep_strerror(struct tep_handle *tep __maybe_unused,
+ enum tep_errno errnum, char *buf, size_t buflen)
{
- int err = strerror_r(errnum, buf, buflen);
- if (err)
- snprintf(buf, buflen, "INTERNAL ERROR: strerror_r(%d, [buf], %zd)=%d", errnum, buflen, err);
- return buf;
+ const char *msg;
+ int idx;
+
+ if (!buflen)
+ return 0;
+
+ if (errnum >= 0) {
+ int err = strerror_r(errnum, buf, buflen);
+ buf[buflen - 1] = 0;
+ return err;
+ }
+
+ if (errnum <= __TEP_ERRNO__START ||
+ errnum >= __TEP_ERRNO__END)
+ return -1;
+
+ idx = errnum - __TEP_ERRNO__START - 1;
+ msg = tep_error_str[idx];
+ snprintf(buf, buflen, "%s", msg);
+
+ return 0;
}
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