Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757007Ab2HVHH6 (ORCPT ); Wed, 22 Aug 2012 03:07:58 -0400 Received: from LGEMRELSE7Q.lge.com ([156.147.1.151]:59969 "EHLO LGEMRELSE7Q.lge.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755965Ab2HVHHY (ORCPT ); Wed, 22 Aug 2012 03:07:24 -0400 X-AuditID: 9c930197-b7bb2ae0000011d9-03-50348527e79f From: Namhyung Kim To: Steven Rostedt , Arnaldo Carvalho de Melo Cc: Frederic Weisbecker , Peter Zijlstra , Ingo Molnar , LKML , Namhyung Kim , "Kirill A. Shutemov" Subject: [PATCH 4/4] tools lib traceevent: Fix strerror_r() use in pevent_strerror Date: Wed, 22 Aug 2012 16:00:31 +0900 Message-Id: <1345618831-9148-5-git-send-email-namhyung@kernel.org> X-Mailer: git-send-email 1.7.11.4 In-Reply-To: <1345618831-9148-1-git-send-email-namhyung@kernel.org> References: <1345618831-9148-1-git-send-email-namhyung@kernel.org> X-Brightmail-Tracker: AAAAAA== Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2023 Lines: 61 From: Namhyung Kim glibc-2.16 starts to mark the function with attribute warn_unused_result so that it can cause a build warning. Since GNU version of strerror_r() can return a pointer to a string without setting @buf, check the return value and copy/truncate it to our buffer if needed. Cc: Fredereic Weisbecker Cc: Steven Rostedt Cc: Kirill A. Shutemov Signed-off-by: Namhyung Kim --- tools/lib/traceevent/event-parse.c | 7 ++++++- tools/lib/traceevent/event-utils.h | 6 ++++++ 2 files changed, 12 insertions(+), 1 deletion(-) diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c index 1373e4cf109e..f978c59f67bf 100644 --- a/tools/lib/traceevent/event-parse.c +++ b/tools/lib/traceevent/event-parse.c @@ -4809,7 +4809,12 @@ int pevent_strerror(struct pevent *pevent, enum pevent_errno errnum, const char *msg; if (errnum >= 0) { - strerror_r(errnum, buf, buflen); + msg = strerror_r(errnum, buf, buflen); + if (msg != buf) { + size_t len = strlen(msg); + char *c = mempcpy(buf, msg, min(buflen-1, len)); + *c = '\0'; + } return 0; } diff --git a/tools/lib/traceevent/event-utils.h b/tools/lib/traceevent/event-utils.h index 08296383d1e6..bc075006966e 100644 --- a/tools/lib/traceevent/event-utils.h +++ b/tools/lib/traceevent/event-utils.h @@ -39,6 +39,12 @@ void __vdie(const char *fmt, ...); void __vwarning(const char *fmt, ...); void __vpr_stat(const char *fmt, ...); +#define min(x, y) ({ \ + typeof(x) _min1 = (x); \ + typeof(y) _min2 = (y); \ + (void) (&_min1 == &_min2); \ + _min1 < _min2 ? _min1 : _min2; }) + static inline char *strim(char *string) { char *ret; -- 1.7.11.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/