perf trace: Introduce special handling for pipe input

Adds special treatment for stdin - if the user specifies '-i -'
to perf trace, the intent is that the event stream be read from
stdin rather than from a disk file.

The actual handling of the '-' filename is done by the session;
this just adds a signal handler to stop reporting, and turns off
interference by the pager.

Signed-off-by: Tom Zanussi <tzanussi@gmail.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Cc: fweisbec@gmail.com
Cc: rostedt@goodmis.org
Cc: k-keiichi@bx.jp.nec.com
Cc: acme@ghostprotocols.net
LKML-Reference: <1270184365-8281-5-git-send-email-tzanussi@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 11 insertions, 1 deletions

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index 8fc50d831540..c681e85a912c 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -106,8 +106,17 @@ static struct perf_event_ops event_ops = {
         .comm   = event__process_comm,
 };
 
+extern volatile int session_done;
+
+static void sig_handler(int sig __unused)
+{
+        session_done = 1;
+}
+
 static int __cmd_trace(struct perf_session *session)
 {
+        signal(SIGINT, sig_handler);
+
         return perf_session__process_events(session, &event_ops);
 }
 
@@ -580,7 +589,8 @@ int cmd_trace(int argc, const char **argv, const char *prefix __used)
         if (session == NULL)
                 return -ENOMEM;
 
-        if (!perf_session__has_traces(session, "record -R"))
+        if (strcmp(input_name, "-") &&
+            !perf_session__has_traces(session, "record -R"))
                 return -EINVAL;
 
         if (generate_script_lang) {