From 6df5acf970852a94b254800dc69569bd1f4c9ae8 Mon Sep 17 00:00:00 2001
From: Karel Zak
Date: Wed, 24 Oct 2018 12:28:13 +0200
Subject: 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>
---
 include/timer.h | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

(limited to 'include/timer.h')

diff --git a/include/timer.h b/include/timer.h
index aa9f9c018..70da1ba9e 100644
--- a/include/timer.h
+++ b/include/timer.h
@@ -4,8 +4,19 @@
 #include <signal.h>
 #include <sys/time.h>
 
-extern int setup_timer(timer_t * t_id, struct itimerval *timeout,
+#ifdef HAVE_TIMER_CREATE
+struct ul_timer {
+	timer_t t_id;
+};
+#else
+struct ul_timer {
+	struct itimerval old_timer;
+	struct sigaction old_sa;
+};
+#endif
+
+extern int setup_timer(struct ul_timer *timer, struct itimerval *timeout,
 		       void (*timeout_handler)(int, siginfo_t *, void *));
-extern void cancel_timer(timer_t * t_id);
+extern void cancel_timer(struct ul_timer *timer);
 
 #endif /* UTIL_LINUX_TIMER_H */
-- 
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