From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753309AbcEJPTF (ORCPT ); Tue, 10 May 2016 11:19:05 -0400 Received: from bombadil.infradead.org ([198.137.202.9]:39556 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752999AbcEJPQX (ORCPT ); Tue, 10 May 2016 11:16:23 -0400 From: Arnaldo Carvalho de Melo To: Ingo Molnar Cc: linux-kernel@vger.kernel.org, Masami Hiramatsu , Namhyung Kim , Peter Zijlstra , Arnaldo Carvalho de Melo Subject: [PATCH 10/15] perf help: Make check_emacsclient_version to check strbuf APIs Date: Tue, 10 May 2016 12:15:20 -0300 Message-Id: <1462893325-28646-11-git-send-email-acme@kernel.org> X-Mailer: git-send-email 2.5.5 In-Reply-To: <1462893325-28646-1-git-send-email-acme@kernel.org> References: <1462893325-28646-1-git-send-email-acme@kernel.org> X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Masami Hiramatsu Make check_emacsclient_version() to check the return value of strbuf APIs so that it can handle errors in strbuf. Signed-off-by: Masami Hiramatsu Cc: Namhyung Kim Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/20160510054716.6158.11755.stgit@devbox Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/builtin-help.c | 18 ++++++++++-------- 1 file changed, 10 insertions(+), 8 deletions(-) diff --git a/tools/perf/builtin-help.c b/tools/perf/builtin-help.c index bc1de9b8fd67..f9830c902b78 100644 --- a/tools/perf/builtin-help.c +++ b/tools/perf/builtin-help.c @@ -61,6 +61,7 @@ static int check_emacsclient_version(void) struct child_process ec_process; const char *argv_ec[] = { "emacsclient", "--version", NULL }; int version; + int ret = -1; /* emacsclient prints its version number on stderr */ memset(&ec_process, 0, sizeof(ec_process)); @@ -71,7 +72,10 @@ static int check_emacsclient_version(void) fprintf(stderr, "Failed to start emacsclient.\n"); return -1; } - strbuf_read(&buffer, ec_process.err, 20); + if (strbuf_read(&buffer, ec_process.err, 20) < 0) { + fprintf(stderr, "Failed to read emacsclient version\n"); + goto out; + } close(ec_process.err); /* @@ -82,8 +86,7 @@ static int check_emacsclient_version(void) if (prefixcmp(buffer.buf, "emacsclient")) { fprintf(stderr, "Failed to parse emacsclient version.\n"); - strbuf_release(&buffer); - return -1; + goto out; } version = atoi(buffer.buf + strlen("emacsclient")); @@ -92,12 +95,11 @@ static int check_emacsclient_version(void) fprintf(stderr, "emacsclient version '%d' too old (< 22).\n", version); - strbuf_release(&buffer); - return -1; - } - + } else + ret = 0; +out: strbuf_release(&buffer); - return 0; + return ret; } static void exec_woman_emacs(const char *path, const char *page) -- 2.5.5