support: Add support_create_timer

It is a simple wrapper over timer_create, timer_settime, and
sigaction.  It will be used to check for large timeout to trigger an
EINTR and to avoid use a large timeout (as for alarm()).

Reviewed-by: Lukasz Majewski <lukma@denx.de>

1 files changed, 11 insertions, 0 deletions

diff --git a/support/support.h b/support/support.h
index 874204b7fc..9ec8ecb8d7 100644
--- a/support/support.h
+++ b/support/support.h
@@ -24,6 +24,7 @@
 #define SUPPORT_H
 
 #include <stdbool.h>
+#include <stdint.h>
 #include <stddef.h>
 #include <sys/cdefs.h>
 /* For mode_t.  */
@@ -153,6 +154,16 @@ extern bool support_select_modifies_timeout (void);
    tv_usec larger than 1000000.  */
 extern bool support_select_normalizes_timeout (void);
 
+/* Create a timer that trigger after SEC seconds and NSEC nanoseconds.  If
+   REPEAT is true the timer will repeat indefinitely.  If CALLBACK is not
+   NULL, the function will be called when the timer expires; otherwise a
+   dummy empty function is used instead.
+   This is implemented with POSIX per-process timer with SIGEV_SIGNAL.  */
+timer_t support_create_timer (uint64_t sec, long int nsec, bool repeat,
+			      void (*callback)(int));
+/* Disable the timer TIMER.  */
+void support_delete_timer (timer_t timer);
+
 __END_DECLS
 
 #endif /* SUPPORT_H */