lib/timer: add fallback if timer_create() not available
* add struct ul_timer as API abstraction to hide differences between timer_create() and setitimer() * add setitimer() detection to ./configure.ac * add fallback code to use setitimer() if timer_create() not available (for example on OSX) Addresses: https://github.com/karelzak/util-linux/issues/584 Signed-off-by: Karel Zak <kzak@redhat.com>
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@ -558,6 +558,10 @@ AC_CHECK_FUNCS([timer_create],
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AC_SUBST([REALTIME_LIBS])
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AS_IF([test x"$have_timer" = xno], [
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AC_CHECK_FUNCS([setitimer], [have_timer="yes"], [have_timer="no"])
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])
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AC_CHECK_LIB([rtas], [rtas_get_sysparm], [
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RTAS_LIBS="-lrtas"
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@ -4,8 +4,19 @@
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#include <signal.h>
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#include <sys/time.h>
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extern int setup_timer(timer_t * t_id, struct itimerval *timeout,
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#ifdef HAVE_TIMER_CREATE
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struct ul_timer {
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timer_t t_id;
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};
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#else
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struct ul_timer {
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struct itimerval old_timer;
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struct sigaction old_sa;
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};
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#endif
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extern int setup_timer(struct ul_timer *timer, struct itimerval *timeout,
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void (*timeout_handler)(int, siginfo_t *, void *));
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extern void cancel_timer(timer_t * t_id);
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extern void cancel_timer(struct ul_timer *timer);
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#endif /* UTIL_LINUX_TIMER_H */
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40
lib/timer.c
40
lib/timer.c
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@ -27,7 +27,9 @@
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* The applications need to ensure that they can tolerate multiple signal
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* deliveries.
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*/
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int setup_timer(timer_t * t_id, struct itimerval *timeout,
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#ifdef HAVE_TIMER_CREATE
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int setup_timer(struct ul_timer *timer,
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struct itimerval *timeout,
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void (*timeout_handler)(int, siginfo_t *, void *))
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{
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time_t sec = timeout->it_value.tv_sec;
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@ -52,14 +54,42 @@ int setup_timer(timer_t * t_id, struct itimerval *timeout,
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if (sigaction(SIGALRM, &sig_a, NULL))
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return 1;
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if (timer_create(CLOCK_MONOTONIC, &sig_e, t_id))
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if (timer_create(CLOCK_MONOTONIC, &sig_e, &timer->t_id))
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return 1;
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if (timer_settime(*t_id, 0, &val, NULL))
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if (timer_settime(timer->t_id, 0, &val, NULL))
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return 1;
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return 0;
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}
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void cancel_timer(struct ul_timer *timer)
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{
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timer_delete(timer->t_id);
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}
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#else /* !HAVE_TIMER_CREATE */
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int setup_timer(struct ul_timer *timer,
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struct itimerval *timeout,
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void (*timeout_handler)(int, siginfo_t *, void *))
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{
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struct sigaction sa;
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memset(&sa, 0, sizeof sa);
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memset(timer, 0, sizeof(*timer));
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sa.sa_flags = SA_SIGINFO | SA_RESETHAND;
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sa.sa_sigaction = timeout_handler;
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if (sigaction(SIGALRM, &sa, &timer->old_sa))
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return 1;
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if (setitimer(ITIMER_REAL, timeout, &timer->old_timer) != 0)
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return 1;
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return 0;
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}
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void cancel_timer(timer_t *t_id)
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void cancel_timer(struct ul_timer *timer)
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{
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timer_delete(*t_id);
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setitimer(ITIMER_REAL, &timer->old_timer, NULL);
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sigaction(SIGALRM, &timer->old_sa, NULL);
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}
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#endif /* !HAVE_TIMER_CREATE */
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@ -298,7 +298,9 @@ static void timeout_handler(int sig __attribute__((__unused__)),
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siginfo_t * info,
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void *context __attribute__((__unused__)))
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{
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#ifdef HAVE_TIMER_CREATE
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if (info->si_code == SI_TIMER)
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#endif
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errx(EXIT_FAILURE, _("timed out"));
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}
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@ -327,18 +329,18 @@ static void server_loop(const char *socket_path, const char *pidfile_path,
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if (!uuidd_cxt->no_sock) /* no_sock implies no_fork and no_pid */
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#endif
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{
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static timer_t t_id;
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struct ul_timer timer;
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struct itimerval timeout;
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memset(&timeout, 0, sizeof timeout);
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timeout.it_value.tv_sec = 30;
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if (setup_timer(&t_id, &timeout, &timeout_handler))
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if (setup_timer(&timer, &timeout, &timeout_handler))
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err(EXIT_FAILURE, _("cannot set up timer"));
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if (pidfile_path)
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fd_pidfile = create_pidfile(uuidd_cxt, pidfile_path);
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ret = call_daemon(socket_path, UUIDD_OP_GETPID, reply_buf,
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sizeof(reply_buf), 0, NULL);
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cancel_timer(&t_id);
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cancel_timer(&timer);
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if (ret > 0) {
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if (!uuidd_cxt->quiet)
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warnx(_("uuidd daemon is already running at pid %s"),
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@ -81,7 +81,9 @@ static void timeout_handler(int sig __attribute__((__unused__)),
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siginfo_t *info,
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void *context __attribute__((__unused__)))
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{
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#ifdef HAVE_TIMER_CREATE
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if (info->si_code == SI_TIMER)
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#endif
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timeout_expired = 1;
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}
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@ -124,7 +126,7 @@ static void __attribute__((__noreturn__)) run_program(char **cmd_argv)
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int main(int argc, char *argv[])
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{
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static timer_t t_id;
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struct ul_timer timer;
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struct itimerval timeout;
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int have_timeout = 0;
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int type = LOCK_EX;
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@ -268,7 +270,7 @@ int main(int argc, char *argv[])
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have_timeout = 0;
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block = LOCK_NB;
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} else
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if (setup_timer(&t_id, &timeout, &timeout_handler))
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if (setup_timer(&timer, &timeout, &timeout_handler))
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err(EX_OSERR, _("cannot set up timer"));
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}
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@ -321,7 +323,7 @@ int main(int argc, char *argv[])
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}
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if (have_timeout)
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cancel_timer(&t_id);
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cancel_timer(&timer);
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if (verbose) {
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struct timeval delta;
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