From: Masami Hiramatsu Date: Tue, 10 May 2016 05:47:17 +0000 (+0900) Subject: perf help: Make check_emacsclient_version to check strbuf APIs X-Git-Tag: v5.15~13668^2~4^2~5 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=b72ca4039099e953f1ea2dbd58c201b14feb6605;p=platform%2Fkernel%2Flinux-starfive.git perf help: Make check_emacsclient_version to check strbuf APIs 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 --- diff --git a/tools/perf/builtin-help.c b/tools/perf/builtin-help.c index bc1de9b..f9830c9 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)