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tools/power turbostat: fix printing on input 

The recent patch that implements table printing on a keypress introduced a
regression - turbostat prints the table almost continuously if it is run from a
daemon program.

The problem is also easy to reproduce like this:

echo | turbostat

The reason is that we cannot assume that stdin is always a TTY. It can be many
things.

This patch adds fixes the problem by limiting the new keypress functionality to
TTYs only. If stdin is not a TTY, we just sleep for the full interval time.

While on it, clean-up 'do_sleep()' to return no value, as callers do not expect
that anyway.

Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Artem Bityutskiy 2017-10-04 15:01:47 +03:00 committed by Len Brown
parent b9ad8ee0da
commit 47936f944e
1 changed files with 10 additions and 6 deletions
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16
tools/power/x86/turbostat/turbostat.c
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@ -49,6 +49,7 @@ char *proc_stat = "/proc/stat";
FILE *outf;
int *fd_percpu;
struct timeval interval_tv = {5, 0};
struct timespec interval_ts = {5, 0};
struct timespec one_msec = {0, 1000000};
unsigned int debug;
unsigned int quiet;
@ -2635,7 +2636,7 @@ void setup_signal_handler(void)
err(1, "sigaction SIGUSR1");
}
int do_sleep(void)
void do_sleep(void)
{
struct timeval select_timeout;
fd_set readfds;
@ -2644,12 +2645,15 @@ int do_sleep(void)
FD_ZERO(&readfds);
FD_SET(0, &readfds);
select_timeout = interval_tv;
if (!isatty(fileno(stdin))) {
nanosleep(&interval_ts, NULL);
return;
}
select_timeout = interval_tv;
retval = select(1, &readfds, NULL, NULL, &select_timeout);
if (retval == 1) {
switch (getc(stdin)) {
case 'q':
exit_requested = 1;
@ -2658,9 +2662,8 @@ int do_sleep(void)
/* make sure this manually-invoked interval is at least 1ms long */
nanosleep(&one_msec, NULL);
}
return retval;
}
void turbostat_loop()
{
int retval;
@ -5134,8 +5137,9 @@ void cmdline(int argc, char **argv)
exit(2);
}
interval_tv.tv_sec = interval;
interval_tv.tv_sec = interval_ts.tv_sec = interval;
interval_tv.tv_usec = (interval - interval_tv.tv_sec) * 1000000;
interval_ts.tv_nsec = (interval - interval_ts.tv_sec) * 1000000000;
}
break;
case 'J':