diff -up at-3.1.14/atd.c.timers at-3.1.14/atd.c

--- at-3.1.14/atd.c.timers	2013-12-02 11:03:01.250080057 +0100

+++ at-3.1.14/atd.c	2013-12-02 11:06:15.560243498 +0100

@@ -831,6 +831,54 @@ run_loop()

     return next_job;

 }

+#ifdef HAVE_CLOCK_GETTIME

+timer_t timer;

+struct itimerspec timeout;

+

+void timer_setup()

+{

+    struct sigevent sev;

+

+    sev.sigev_notify = SIGEV_SIGNAL;

+    sev.sigev_signo = SIGHUP;

+    sev.sigev_value.sival_ptr = &timer;

+

+    memset(&timeout, 0, sizeof(timeout));

+

+    if (timer_create(CLOCK_REALTIME, &sev, &timer) < 0)

+           pabort("unable to create timer");

+}

+

+time_t atd_gettime()

+{

+    struct timespec curtime;

+

+    clock_gettime(CLOCK_REALTIME, &curtime);

+

+    return curtime.tv_sec;

+}

+

+void atd_setalarm(time_t next)

+{

+    timeout.it_value.tv_sec = next;

+    timer_settime(timer, TIMER_ABSTIME, &timeout, NULL);

+    pause();

+}

+#else

+void timer_setup()

+{

+}

+

+time_t atd_gettime()

+{

+    return time(NULL);

+}

+

+void atd_setalarm(time_t next)

+{

+    sleep(next - atd_gettime());

+}

+#endif

 /* Global functions */

 int

@@ -936,7 +984,7 @@ main(int argc, char *argv[])

     sigaction(SIGCHLD, &act, NULL);

     if (!run_as_daemon) {

-	now = time(NULL);

+	now = atd_gettime();

 	run_loop();

 	exit(EXIT_SUCCESS);

     }

@@ -959,13 +1007,14 @@ main(int argc, char *argv[])

     act.sa_handler = set_term;

     sigaction(SIGINT, &act, NULL);

+    timer_setup();

     daemon_setup();

     do {

-	now = time(NULL);

+	now = atd_gettime();

 	next_invocation = run_loop();

 	if (next_invocation > now) {

-	    sleep(next_invocation - now);

+	    atd_setalarm(next_invocation);

 	}

     } while (!term_signal);

     daemon_cleanup();

diff -up at-3.1.14/config.h.in.timers at-3.1.14/config.h.in

--- at-3.1.14/config.h.in.timers	2013-12-02 11:00:27.000000000 +0100

+++ at-3.1.14/config.h.in	2013-12-02 11:02:06.521033976 +0100

@@ -38,6 +38,9 @@

 /* Define to 1 if you have the `getloadavg' function. */

 #undef HAVE_GETLOADAVG

+/* Define to 1 if you have the `clock_gettime' function. */

+#undef HAVE_TIMER_CREATE

+

 /* Define to 1 if you have the <getopt.h> header file. */

 #undef HAVE_GETOPT_H

diff -up at-3.1.14/configure.ac.timers at-3.1.14/configure.ac

--- at-3.1.14/configure.ac.timers	2013-12-02 11:00:27.000000000 +0100

+++ at-3.1.14/configure.ac	2013-12-02 11:02:45.217066560 +0100

@@ -254,6 +254,10 @@ AC_CHECK_LIB(selinux, is_selinux_enabled

 AC_SUBST(SELINUXLIB)

 AC_SUBST(WITH_SELINUX)

+dnl check for POSIX timer functions

+AC_SEARCH_LIBS([timer_create],[rt])

+AC_CHECK_FUNCS([timer_create])

+

 AC_MSG_CHECKING(groupname to run under)

 AC_ARG_WITH(daemon_groupname,

 [ --with-daemon_groupname=DAEMON_GROUPNAME	Groupname to run under (default daemon) ],