From 0498ff00c580f9e1459517597642750b04174f49 Mon Sep 17 00:00:00 2001
From: Erik Rigtorp <erik@rigtorp.se>
Date: Mon, 25 Sep 2023 18:25:34 -0500
Subject: [PATCH] Fix for maxOS and OpenBSD

Fallback to nanosleep if clock_nanosleep doesn't exist.

Closes #33
---
 src/udpreplay.cpp | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/udpreplay.cpp b/src/udpreplay.cpp
index 3aeeb9f..dc61f2a 100644
--- a/src/udpreplay.cpp
+++ b/src/udpreplay.cpp
@@ -215,11 +215,25 @@ int main(int argc, char *argv[]) {
 
       if (deadline.tv_sec > now.tv_sec ||
           (deadline.tv_sec == now.tv_sec && deadline.tv_nsec > now.tv_nsec)) {
+#if _POSIX_C_SOURCE >= 200112L
         if (clock_nanosleep(CLOCK_MONOTONIC, TIMER_ABSTIME, &deadline,
                             nullptr) == -1) {
           std::cerr << "clock_nanosleep: " << strerror(errno) << std::endl;
           return 1;
         }
+#else
+        timespec duration;
+        duration.tv_sec = deadline.tv_sec - now.tv_sec;
+        duration.tv_nsec = deadline.tv_nsec - now.tv_nsec;
+        if (duration.tv_nsec < 0) {
+          --duration.tv_sec;
+          duration.tv_nsec += NANOSECONDS_PER_SECOND;
+        }
+        if (nanosleep(&duration, nullptr) == -1) {
+          std::cerr << "nanosleep: " << strerror(errno) << std::endl;
+          return 1;
+        }
+#endif
       }
 
 #ifdef __GLIBC__