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perf_counter tools: Propagate signals properly 

Currently report and stat catch SIGINT (and others) without altering
their exit state. This means that things like:

   while :; do perf stat ./foo ; done

Loops become hard-to-interrupt, because bash never sees perf terminate
due to interruption. Fix this.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2009-06-10 15:55:59 +02:00 committed by Ingo Molnar
parent 4502d77c1d
commit f7b7c26e01
2 changed files with 25 additions and 0 deletions
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12
tools/perf/builtin-record.c
View File

@ -169,10 +169,21 @@ static void mmap_read(struct mmap_data *md)
}
static volatile int done = 0;
static volatile int signr = -1;
static void sig_handler(int sig)
{
done = 1;
signr = sig;
}
static void sig_atexit(void)
{
if (signr == -1)
return;
signal(signr, SIG_DFL);
kill(getpid(), signr);
}
static void pid_synthesize_comm_event(pid_t pid, int full)
@ -459,6 +470,7 @@ static int __cmd_record(int argc, const char **argv)
} else for (i = 0; i < nr_cpus; i++)
open_counters(i, target_pid);
atexit(sig_atexit);
signal(SIGCHLD, sig_handler);
signal(SIGINT, sig_handler);

13
tools/perf/builtin-stat.c
View File

@ -296,8 +296,20 @@ static int do_perf_stat(int argc, const char **argv)
return 0;
}
static volatile int signr = -1;
static void skip_signal(int signo)
{
signr = signo;
}
static void sig_atexit(void)
{
if (signr == -1)
return;
signal(signr, SIG_DFL);
kill(getpid(), signr);
}
static const char * const stat_usage[] = {
@ -345,6 +357,7 @@ int cmd_stat(int argc, const char **argv, const char *prefix)
* What we want is for Ctrl-C to work in the exec()-ed
* task, but being ignored by perf stat itself:
*/
atexit(sig_atexit);
signal(SIGINT, skip_signal);
signal(SIGALRM, skip_signal);
signal(SIGABRT, skip_signal);