Replaces clock_gettime() with ast_tsnow()

clock_gettime() is, unfortunately, not portable. But I did like that
over our usual `ts.tv_nsec = tv.tv_usec * 1000` copy/paste code we
usually do when we want a timespec and all we have is ast_tvnow().

This patch adds ast_tsnow(), which mimics ast_tvnow(), but returns a
timespec. If clock_gettime() is available, it will use that. Otherwise
ast_tsnow() falls back to using ast_tvnow().

Change-Id: Ibb1ee67ccf4826b9b76d5a5eb62e90b29b6c456e

2 files changed, 37 insertions, 0 deletions

diff --git a/include/asterisk/autoconfig.h.in b/include/asterisk/autoconfig.h.in
index 6b41a8c9a..c0c34736b 100644
--- a/include/asterisk/autoconfig.h.in
+++ b/include/asterisk/autoconfig.h.in
@@ -764,6 +764,9 @@
 /* Define to 1 if you have the `roundl' function. */
 #undef HAVE_ROUNDL
 
+/* Define to 1 if rt has the Realtime functions feature. */
+#undef HAVE_RT
+
 /* Define if your system has the RTLD_NOLOAD headers. */
 #undef HAVE_RTLD_NOLOAD
 
diff --git a/include/asterisk/time.h b/include/asterisk/time.h
index f2382df33..529490630 100644
--- a/include/asterisk/time.h
+++ b/include/asterisk/time.h
@@ -23,10 +23,16 @@
 #ifndef _ASTERISK_TIME_H
 #define _ASTERISK_TIME_H
 
+#include "asterisk/autoconfig.h"
+
 #ifdef HAVE_SYS_TIME_H
 #include <sys/time.h>
 #endif
 
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
 #include "asterisk/inline_api.h"
 
 /* We have to let the compiler learn what types to use for the elements of a
@@ -142,6 +148,34 @@ struct timeval ast_tvnow(void),
 )
 
 /*!
+ * \brief Returns current timespec. Meant to avoid calling ast_tvnow() just to
+ * create a timespec from the timeval it returns.
+ */
+#if defined _POSIX_TIMERS && _POSIX_TIMERS > 0
+AST_INLINE_API(
+struct timespec ast_tsnow(void),
+{
+	struct timespec ts;
+	clock_gettime(CLOCK_REALTIME, &ts);
+	return ts;
+}
+)
+#else
+AST_INLINE_API(
+struct timespec ast_tsnow(void),
+{
+	struct timeval tv = ast_tvnow();
+	struct timespec ts;
+	/* Can't use designated initializer, because it does odd things with
+	 * the AST_INLINE_API macro. Go figure. */
+	ts.tv_sec = tv.tv_sec;
+	ts.tv_nsec = tv.tv_usec * 1000;
+	return ts;
+}
+)
+#endif
+
+/*!
  * \brief Returns the sum of two timevals a + b
  */
 struct timeval ast_tvadd(struct timeval a, struct timeval b);