From 6db4e40119dd7c3b5fed3018a81e425e822929e9 Mon Sep 17 00:00:00 2001
From: ejurgensen <espenjurgensen@gmail.com>
Date: Sun, 15 Jan 2017 23:19:57 +0100
Subject: [PATCH] [misc] Add function to add a relative time to current clock

---
 src/misc.c | 16 ++++++++++++++++
 src/misc.h |  3 +++
 2 files changed, 19 insertions(+)

diff --git a/src/misc.c b/src/misc.c
index f624bd4a..769b15e2 100644
--- a/src/misc.c
+++ b/src/misc.c
@@ -27,6 +27,7 @@
 #endif
 
 #include <stdlib.h>
+#include <unistd.h>
 #include <string.h>
 #include <ctype.h>
 #include <errno.h>
@@ -928,6 +929,21 @@ timespec_cmp(struct timespec time1, struct timespec time2)
     return 0;
 }
 
+struct timespec
+timespec_reltoabs(struct timespec relative)
+{
+  struct timespec absolute;
+
+#if _POSIX_TIMERS > 0
+  clock_gettime(CLOCK_REALTIME, &absolute);
+#else
+  struct timeval tv;
+  gettimeofday(&tv, NULL);
+  TIMEVAL_TO_TIMESPEC(&tv, &absolute);
+#endif
+  return timespec_add(absolute, relative);
+}
+
 #if defined(HAVE_MACH_CLOCK) || defined(HAVE_MACH_TIMER)
 
 #include <mach/mach_time.h> /* mach_absolute_time */
diff --git a/src/misc.h b/src/misc.h
index c358dde9..de1a089e 100644
--- a/src/misc.h
+++ b/src/misc.h
@@ -145,6 +145,9 @@ timespec_add(struct timespec time1, struct timespec time2);
 int
 timespec_cmp(struct timespec time1, struct timespec time2);
 
+struct timespec
+timespec_reltoabs(struct timespec relative);
+
 /* initialize mutex with error checking (not default on all platforms) */
 int
 mutex_init(pthread_mutex_t *mutex);