1 files changed, 53 insertions, 0 deletions
diff --git a/src/libstddjb/sysclock_set.c b/src/libstddjb/sysclock_set.c
new file mode 100644
index 0000000..0ec51c6
--- /dev/null
+++ b/src/libstddjb/sysclock_set.c
@@ -0,0 +1,53 @@
+/* ISC license. */
+
+/* MT-unsafe */
+
+#include <skalibs/config.h>
+#include <skalibs/sysdeps.h>
+
+#ifdef SKALIBS_FLAG_USERT
+# ifndef SKALIBS_HASCLOCKRT
+#  undef SKALIBS_FLAG_USERT
+#  warning "SKALIBS_FLAG_USERT set but SKALIBS_HASCLOCKRT not found. Clearing SKALIBS_FLAG_USERT."
+# endif
+#endif
+
+#ifndef SKALIBS_FLAG_USERT
+# ifndef SKALIBS_HASSETTIMEOFDAY
+#  error "SKALIBS_FLAG_USERT clear but SKALIBS_HASSETTIMEOFDAY not found. How do your set your system clock?"
+# endif
+#endif
+
+
+#ifdef SKALIBS_FLAG_USERT
+
+#include <time.h>
+#include <skalibs/tai.h>
+
+int sysclock_set (tain_t const *a)
+{
+  struct timespec now ;
+  tain_t aa ;
+  tain_add(&aa, a, &tain_nano500) ;
+  if (!timespec_from_tain(&now, &aa)) return 0 ;
+  if (clock_settime(CLOCK_REALTIME, &now) < 0) return 0 ;
+  return 1 ;
+}
+
+#else
+
+#include <skalibs/nonposix.h>
+#include <sys/time.h>
+#include <skalibs/tai.h>
+
+int sysclock_set (tain_t const *a)
+{
+  struct timeval now ;
+  tain_t aa ;
+  tain_add(&aa, a, &tain_nano500) ;
+  if (!timeval_from_tain(&now, &aa)) return 0 ;
+  if (settimeofday(&now, 0) < 0) return 0 ;
+  return 1 ;
+}
+
+#endif