Support clock_gettime() on OSX El Capitan and earlier

1 files changed, 34 insertions, 0 deletions

diff --git a/Compat.c b/Compat.c
index 43d02ec7..55be1b1d 100644
--- a/Compat.c
+++ b/Compat.c
@@ -11,12 +11,18 @@ in the source distribution for its full text.
 
 #include <errno.h>
 #include <fcntl.h> // IWYU pragma: keep
+#include <time.h>
 #include <unistd.h>
 #include <sys/stat.h>
 #include <sys/types.h> // IWYU pragma: keep
 
 #include "XUtils.h" // IWYU pragma: keep
 
+#ifdef HAVE_HOST_GET_CLOCK_SERVICE
+#include <mach/clock.h>
+#include <mach/mach.h>
+#endif
+
 
 int Compat_faccessat(int dirfd,
                      const char* pathname,
@@ -117,3 +123,31 @@ ssize_t Compat_readlinkat(int dirfd,
 
 #endif
 }
+
+int Compat_clock_monotonic_gettime(struct timespec *tp) {
+
+#if defined(HAVE_CLOCK_GETTIME)
+
+   return clock_gettime(CLOCK_MONOTONIC, tp);
+
+#elif defined(HAVE_HOST_GET_CLOCK_SERVICE)
+
+   clock_serv_t cclock;
+   mach_timespec_t mts;
+
+   host_get_clock_service(mach_host_self(), SYSTEM_CLOCK, &cclock);
+   clock_get_time(cclock, &mts);
+   mach_port_deallocate(mach_task_self(), cclock);
+
+   tp->tv_sec = mts.tv_sec;
+   tp->tv_nsec = mts.tv_nsec;
+
+   return 0;
+
+#else
+
+#error No Compat_clock_monotonic_gettime() implementation!
+
+#endif
+
+}