1 files changed, 47 insertions, 0 deletions
diff --git a/src/libstddjb/tain_clockmon.c b/src/libstddjb/tain_clockmon.c
new file mode 100644
index 0000000..f14cd31
--- /dev/null
+++ b/src/libstddjb/tain_clockmon.c
@@ -0,0 +1,47 @@
+/* ISC license. */
+
+#include <skalibs/sysdeps.h>
+#include <skalibs/tai.h>
+
+#ifdef SKALIBS_HASCLOCKMON
+
+#include <time.h>
+
+int tain_clockmon_init (tain_t *offset)
+{
+  tain_t a, b ;
+  struct timespec ts ;
+  if (!tain_sysclock(&a)) return 0 ;
+  if (clock_gettime(CLOCK_MONOTONIC, &ts) < 0) return 0 ;
+  if (!tain_from_timespec(&b, &ts)) return 0 ;
+  tain_add(&a, &a, &tain_nano500) ;
+  tain_sub(offset, &a, &b) ;
+  return 1 ;
+}
+
+int tain_clockmon (tain_t *a, tain_t const *offset)
+{
+  struct timespec ts ;
+  if (clock_gettime(CLOCK_MONOTONIC, &ts) < 0) return 0 ;
+  if (!tain_from_timespec(a, &ts)) return 0 ;
+  tain_add(a, a, offset) ;
+  return 1 ;
+}
+
+#else
+
+#include <errno.h>
+
+int tain_clockmon_init (tain_t *offset)
+{
+  (void)offset ;
+  return (errno = ENOSYS, 0) ;
+}
+
+int tain_clockmon (tain_t *a, tain_t const *offset)
+{
+  (void)a ; (void)offset ;
+  return (errno = ENOSYS, 0) ;
+}
+
+#endif