Simplify timerfd configuration and fix some minor glitches.

* configure.ac (HAVE_TIMERFD): Define only if TFD_CLOEXEC works,
since the code leaked file descriptors to children when !TFD_CLOEXEC.
(HAVE_TIMERFD_CLOEXEC): Remove; no longer used.
* m4/clock_time.m4 (gl_CLOCK_TIME): Don't check for clock_getres.
This reverts the previous change to this file, so it matches
gnulib again.
* src/atimer.c (TIMERFD_CREATE_FLAGS): Remove; we now assume TFD_CLOEXEC.
(alarm_timer, alarm_timer_ok, set_alarm, init_atimer):
Fall back on timer_create if timerfd_create fails at runtime.
(resolution) [HAVE_CLOCK_GETRES]: Remove; we now rely on the
kernel primitives to do resolution.  All uses removed.
(timerfd) [!HAVE_TIMERFD]: Define to be -1, for convenience.
(turn_on_atimers): Clear timer_create-based timers too,
for consistency.

1 files changed, 10 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index c7fd47636a5..2dfef7037fe 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,13 @@
+2014-07-31  Paul Eggert  <eggert@cs.ucla.edu>
+
+        Simplify timerfd configuration and fix some minor glitches.
+        * configure.ac (HAVE_TIMERFD): Define only if TFD_CLOEXEC works,
+        since the code leaked file descriptors to children when !TFD_CLOEXEC.
+        (HAVE_TIMERFD_CLOEXEC): Remove; no longer used.
+        * m4/clock_time.m4 (gl_CLOCK_TIME): Don't check for clock_getres.
+        This reverts the previous change to this file, so it matches
+        gnulib again.
+
 2014-07-28  Dmitry Antipov  <dmantipov@yandex.ru>
 
         * configure.ac (toplevel): Check whether GNU/Linux-specific