1 files changed, 51 insertions, 0 deletions
diff --git a/libc/misc/time/adjtime.c b/libc/misc/time/adjtime.c
new file mode 100644
index 000000000..12c1a2a40
--- /dev/null
+++ b/libc/misc/time/adjtime.c
@@ -0,0 +1,51 @@
+#include <limits.h>
+#include <sys/time.h>
+#include <sys/timex.h>
+#include <errno.h>
+
+#define MAX_SEC	(LONG_MAX / 1000000L - 2)
+#define MIN_SEC	(LONG_MIN / 1000000L + 2)
+
+#ifndef MOD_OFFSET
+#define modes mode
+#endif
+
+int
+adjtime(const struct timeval * itv, struct timeval * otv)
+{
+  struct timex tntx;
+
+  if (itv)
+  {
+    struct timeval tmp;
+
+    /* We will do some check here. */
+    tmp.tv_sec = itv->tv_sec + itv->tv_usec / 1000000L;
+    tmp.tv_usec = itv->tv_usec % 1000000L;
+    if (tmp.tv_sec > MAX_SEC || tmp.tv_sec < MIN_SEC)
+    {
+	errno = EINVAL;
+	return -1;
+    }
+    tntx.offset = tmp.tv_usec + tmp.tv_sec * 1000000L;
+    tntx.modes = ADJ_OFFSET_SINGLESHOT;
+  }
+  else
+  {
+    tntx.modes = 0;
+  }
+  if (adjtimex(&tntx) < 0) return -1;
+  if (otv) {
+    if (tntx.offset < 0)
+      {
+	otv->tv_usec = -(-tntx.offset % 1000000);
+	otv->tv_sec  = -(-tntx.offset / 1000000);
+      }
+    else
+      {
+	otv->tv_usec = tntx.offset % 1000000;
+	otv->tv_sec  = tntx.offset / 1000000;
+      }
+  }
+  return 0;
+}