[tip:perf/core] perf kvm: Fix stdin handling for 'kvm stat live' command

tip-bot for Jiri Olsa
2014-08-14T08:44:13Z

Commit-ID: d5b4130ae636e1fd0eaaea7152170198c34fbf62
Gitweb: http://git.kernel.org/tip/d5b4130ae636e1fd0eaaea7152170198c34fbf62
Author: Jiri Olsa <jolsa@kernel.org>
AuthorDate: Mon, 11 Aug 2014 10:50:09 +0200
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Wed, 13 Aug 2014 12:42:24 -0300

perf kvm: Fix stdin handling for 'kvm stat live' command

Currently the initial ~(ICANON | ECHO) terminal mode is not set, so we
dont get stdin data until we press ENTER.

Fixing this by early setting of the ~(ICANON | ECHO) mode and leaving
this mode for whole life of the command, because canonical mode is not
needed.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jean Pihet <jean.pihet@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1407747014-18394-16-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/builtin-kvm.c | 18 +++++-------------
1 file changed, 5 insertions(+), 13 deletions(-)

diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c
index 7cccead..ff40475 100644
--- a/tools/perf/builtin-kvm.c
+++ b/tools/perf/builtin-kvm.c
@@ -885,15 +885,11 @@ static int fd_set_nonblock(int fd)
return 0;
}

-static
-int perf_kvm__handle_stdin(struct termios *tc_now, struct termios *tc_save)
+static int perf_kvm__handle_stdin(void)
{
int c;

- tcsetattr(0, TCSANOW, tc_now);
c = getc(stdin);
- tcsetattr(0, TCSAFLUSH, tc_save);
-
if (c == 'q')
return 1;

@@ -904,7 +900,7 @@ static int kvm_events_live_report(struct perf_kvm_stat *kvm)
{
struct pollfd *pollfds = NULL;
int nr_fds, nr_stdin, ret, err = -EINVAL;
- struct termios tc, save;
+ struct termios save;

/* live flag must be set first */
kvm->live = true;
@@ -919,14 +915,9 @@ static int kvm_events_live_report(struct perf_kvm_stat *kvm)
goto out;
}

+ set_term_quiet_input(&save);
init_kvm_event_record(kvm);

- tcgetattr(0, &save);
- tc = save;
- tc.c_lflag &= ~(ICANON | ECHO);
- tc.c_cc[VMIN] = 0;
- tc.c_cc[VTIME] = 0;
-
signal(SIGINT, sig_handler);
signal(SIGTERM, sig_handler);

@@ -972,7 +963,7 @@ static int kvm_events_live_report(struct perf_kvm_stat *kvm)
goto out;

if (pollfds[nr_stdin].revents & POLLIN)
- done = perf_kvm__handle_stdin(&tc, &save);
+ done = perf_kvm__handle_stdin();

if (!rc && !done)
err = poll(pollfds, nr_fds, 100);
@@ -989,6 +980,7 @@ out:
if (kvm->timerfd >= 0)
close(kvm->timerfd);

+ tcsetattr(0, TCSAFLUSH, &save);
free(pollfds);
return err;
}