perf trace: Filter out POLLHUP'ed file descriptors
authorArnaldo Carvalho de Melo <acme@redhat.com>
Mon, 22 Sep 2014 17:39:48 +0000 (14:39 -0300)
committerArnaldo Carvalho de Melo <acme@redhat.com>
Thu, 25 Sep 2014 19:46:56 +0000 (16:46 -0300)
commit46fb3c21d20415dd2693570c33d0ea6eb8745e04
treec525d62d2f0c0c399d92782add5760dd126a62e4
parent6dcf45ef9877863fb68c065e5ade3cdb6217c504
perf trace: Filter out POLLHUP'ed file descriptors

So that we don't continue polling on vanished file descriptors, i.e.
file descriptors for events monitoring threads that exited.

I.e. the following 'trace' command now exits as expected, instead
of staying in an eternal loop:

      $ sleep 5s &
      $ trace -p `pidof sleep`

Reported-by: Jiri Olsa <jolsa@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-6qegv786zbf6i8us6t4rxug9@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
tools/perf/builtin-trace.c