linux-kernel - [PATCH v1 6/7] perf help: Use run_command

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Date:   Tue, 10 Jan 2023 14:20:02 -0800
From:   Ian Rogers <irogers@...gle.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>, Nicolas Schier <nicolas@...sle.eu>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Athira Rajeev <atrajeev@...ux.vnet.ibm.com>,
        Christy Lee <christylee@...com>,
        Andrii Nakryiko <andrii@...nel.org>,
        Ravi Bangoria <ravi.bangoria@....com>,
        Leo Yan <leo.yan@...aro.org>,
        Yang Jihong <yangjihong1@...wei.com>,
        Qi Liu <liuqi115@...wei.com>,
        James Clark <james.clark@....com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        "Masami Hiramatsu (Google)" <mhiramat@...nel.org>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Zhengjun Xing <zhengjun.xing@...ux.intel.com>,
        Rob Herring <robh@...nel.org>, Xin Gao <gaoxin@...rlc.com>,
        Zechuan Chen <chenzechuan1@...wei.com>,
        Jason Wang <wangborong@...rlc.com>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Stephane Eranian <eranian@...gle.com>,
        German Gomez <german.gomez@....com>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        bpf@...r.kernel.org, llvm@...ts.linux.dev
Cc:     Ian Rogers <irogers@...gle.com>
Subject: [PATCH v1 6/7] perf help: Use run_command_strbuf

Remove boiler plate by using library routine.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/builtin-help.c | 47 ++++++++++++---------------------------
 1 file changed, 14 insertions(+), 33 deletions(-)

diff --git a/tools/perf/builtin-help.c b/tools/perf/builtin-help.c
index 8874e1e0335b..1cb87358cd20 100644
--- a/tools/perf/builtin-help.c
+++ b/tools/perf/builtin-help.c
@@ -70,46 +70,27 @@ static const char *get_man_viewer_info(const char *name)
 static int check_emacsclient_version(void)
 {
 	struct strbuf buffer = STRBUF_INIT;
-	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));
-	ec_process.argv = argv_ec;
-	ec_process.err = -1;
-	ec_process.stdout_to_stderr = 1;
-	if (start_command(&ec_process)) {
-		fprintf(stderr, "Failed to start emacsclient.\n");
-		return -1;
-	}
-	if (strbuf_read(&buffer, ec_process.err, 20) < 0) {
-		fprintf(stderr, "Failed to read emacsclient version\n");
-		goto out;
-	}
-	close(ec_process.err);
-
 	/*
-	 * Don't bother checking return value, because "emacsclient --version"
-	 * seems to always exits with code 1.
+	 * emacsclient may print its version number on stderr. Don't bother
+	 * checking return value, because some "emacsclient --version" commands
+	 * seem to always exits with code 1.
 	 */
-	finish_command(&ec_process);
+	run_command_strbuf("emacsclient --version 2>&1", &buffer);
 
-	if (!strstarts(buffer.buf, "emacsclient")) {
+	if (!strstarts(buffer.buf, "emacsclient"))
 		fprintf(stderr, "Failed to parse emacsclient version.\n");
-		goto out;
-	}
-
-	version = atoi(buffer.buf + strlen("emacsclient"));
+	else {
+		int version = atoi(buffer.buf + strlen("emacsclient"));
 
-	if (version < 22) {
-		fprintf(stderr,
-			"emacsclient version '%d' too old (< 22).\n",
-			version);
-	} else
-		ret = 0;
-out:
+		if (version < 22) {
+			fprintf(stderr,
+				"emacsclient version '%d' too old (< 22).\n",
+				version);
+		} else
+			ret = 0;
+	}
 	strbuf_release(&buffer);
 	return ret;
 }
-- 
2.39.0.314.g84b9a713c41-goog