linux-kernel - [tip:perf/core] perf tools: Add cat as fallback pager

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Message-ID: <tip-21cfc5e10395eba795c0610cf3cf7f0a4f6f33ff@git.kernel.org>
Date:	Thu, 22 May 2014 05:24:27 -0700
From:	tip-bot for Michael Lentine <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, eranian@...gle.com, hpa@...or.com,
	mingo@...nel.org, jolsa@...nel.org, mlentine@...gle.com,
	tglx@...utronix.de
Subject: [tip:perf/core] perf tools: Add cat as fallback pager

Commit-ID:  21cfc5e10395eba795c0610cf3cf7f0a4f6f33ff
Gitweb:     http://git.kernel.org/tip/21cfc5e10395eba795c0610cf3cf7f0a4f6f33ff
Author:     Michael Lentine <mlentine@...gle.com>
AuthorDate: Tue, 20 May 2014 11:48:49 +0200
Committer:  Jiri Olsa <jolsa@...nel.org>
CommitDate: Wed, 21 May 2014 11:48:33 +0200

perf tools: Add cat as fallback pager

This patch adds a fallback to cat for the pager. This is useful
on environments, such as Android, where less does not exist.
It is better to default to cat than to abort.

Signed-off-by: Michael Lentine <mlentine@...gle.com>
Reviewed-by: Stephane Eranian <eranian@...gle.com>
Link: http://lkml.kernel.org/r/1400579330-5043-2-git-send-email-eranian@google.com
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
 tools/perf/util/pager.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/tools/perf/util/pager.c b/tools/perf/util/pager.c
index 3322b84..31ee02d 100644
--- a/tools/perf/util/pager.c
+++ b/tools/perf/util/pager.c
@@ -57,13 +57,13 @@ void setup_pager(void)
 	}
 	if (!pager)
 		pager = getenv("PAGER");
-	if (!pager) {
-		if (!access("/usr/bin/pager", X_OK))
-			pager = "/usr/bin/pager";
-	}
+	if (!(pager || access("/usr/bin/pager", X_OK)))
+		pager = "/usr/bin/pager";
+	if (!(pager || access("/usr/bin/less", X_OK)))
+		pager = "/usr/bin/less";
 	if (!pager)
-		pager = "less";
-	else if (!*pager || !strcmp(pager, "cat"))
+		pager = "cat";
+	if (!*pager || !strcmp(pager, "cat"))
 		return;
 
 	spawned_pager = 1; /* means we are emitting to terminal */
--
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