diff -ur -x configure at-3.1.13.orig/atd.c at-3.1.13/atd.c

--- at-3.1.13.orig/atd.c	2011-11-16 11:30:22.424764253 -0500

+++ at-3.1.13/atd.c	2011-11-16 16:41:12.102831656 -0500

@@ -815,6 +815,54 @@

     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

@@ -835,7 +883,6 @@

     struct sigaction act;

     struct passwd *pwe;

     struct group *ge;

-

 #ifdef WITH_SELINUX

     selinux_enabled=is_selinux_enabled();

 #endif

@@ -912,7 +959,7 @@

     sigaction(SIGCHLD, &act, NULL);

     if (!run_as_daemon) {

-	now = time(NULL);

+	now = atd_gettime();

 	run_loop();

 	exit(EXIT_SUCCESS);

     }

@@ -935,13 +982,15 @@

     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 -ur -x configure at-3.1.13.orig/config.h.in at-3.1.13/config.h.in

--- at-3.1.13.orig/config.h.in	2011-11-16 11:30:22.424764253 -0500

+++ at-3.1.13/config.h.in	2011-11-16 16:32:44.485426754 -0500

@@ -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_CLOCK_GETTIME

+

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

 #undef HAVE_GETOPT_H

diff -ur -x configure at-3.1.13.orig/configure.ac at-3.1.13/configure.ac

--- at-3.1.13.orig/configure.ac	2011-11-16 11:30:22.425764254 -0500

+++ at-3.1.13/configure.ac	2011-11-16 16:31:29.791561747 -0500

@@ -274,5 +274,9 @@

 AC_SUBST(SELINUXLIB)

 AC_SUBST(WITH_SELINUX)

+dnl check for POSIX timer functions

+AC_SEARCH_LIBS([clock_gettime],[rt])

+AC_CHECK_FUNCS([clock_gettime])

+

 AC_CONFIG_FILES(Makefile atrun atd.8 atrun.8 at.1 at.allow.5 batch)

 AC_OUTPUT