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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>
hifive-unleashed-5.1
Tom Zanussi 2010-04-01 23:59:18 -05:00 committed by Ingo Molnar
parent 46656ac7fb
commit c239da3b4b
1 changed files with 11 additions and 1 deletions
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12
tools/perf/builtin-trace.c
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@ -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) {