From 50b8e9507e6c499c5003f0075fde76843bc62c64 Mon Sep 17 00:00:00 2001
From: Franck Bui-Huu <fbuihuu@gmail.com>
Date: Sun, 16 Jan 2011 17:14:45 +0100
Subject: [PATCH] --- yaml --- r: 234360 b: refs/heads/master c:
 d7065adb9b4f3384c2615f0a3dbdb6c3aae1eb18 h: refs/heads/master v: v3

---
 [refs]                            |  2 +-
 trunk/tools/perf/builtin-record.c | 32 +++++++++++++++++++------------
 2 files changed, 21 insertions(+), 13 deletions(-)

diff --git a/[refs] b/[refs]
index 52927c949722..4e012e6b0795 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: e80711ca8512c8586da0c3e18e2f1caf73c88731
+refs/heads/master: d7065adb9b4f3384c2615f0a3dbdb6c3aae1eb18
diff --git a/trunk/tools/perf/builtin-record.c b/trunk/tools/perf/builtin-record.c
index 45a3689f9ed6..1346d4230bc0 100644
--- a/trunk/tools/perf/builtin-record.c
+++ b/trunk/tools/perf/builtin-record.c
@@ -48,7 +48,7 @@ static unsigned int		user_freq 			= UINT_MAX;
 static int			freq				=   1000;
 static int			output;
 static int			pipe_output			=      0;
-static const char		*output_name			= "perf.data";
+static const char		*output_name			= NULL;
 static int			group				=      0;
 static int			realtime_prio			=      0;
 static bool			nodelay				=  false;
@@ -497,18 +497,26 @@ static int __cmd_record(int argc, const char **argv)
 		exit(-1);
 	}
 
-	if (!strcmp(output_name, "-"))
-		pipe_output = 1;
-	else if (!stat(output_name, &st) && st.st_size) {
-		if (write_mode == WRITE_FORCE) {
-			char oldname[PATH_MAX];
-			snprintf(oldname, sizeof(oldname), "%s.old",
-				 output_name);
-			unlink(oldname);
-			rename(output_name, oldname);
+	if (!output_name) {
+		if (!fstat(STDOUT_FILENO, &st) && S_ISFIFO(st.st_mode))
+			pipe_output = 1;
+		else
+			output_name = "perf.data";
+	}
+	if (output_name) {
+		if (!strcmp(output_name, "-"))
+			pipe_output = 1;
+		else if (!stat(output_name, &st) && st.st_size) {
+			if (write_mode == WRITE_FORCE) {
+				char oldname[PATH_MAX];
+				snprintf(oldname, sizeof(oldname), "%s.old",
+					 output_name);
+				unlink(oldname);
+				rename(output_name, oldname);
+			}
+		} else if (write_mode == WRITE_APPEND) {
+			write_mode = WRITE_FORCE;
 		}
-	} else if (write_mode == WRITE_APPEND) {
-		write_mode = WRITE_FORCE;
 	}
 
 	flags = O_CREAT|O_RDWR;