1 files changed, 59 insertions, 0 deletions
diff --git a/lib/settime.c b/lib/settime.c
new file mode 100644
index 0000000..4a5bc81
--- /dev/null
+++ b/lib/settime.c
@@ -0,0 +1,59 @@
+/* settime -- set the system clock
+
+   Copyright (C) 2002, 2004-2007, 2009-2022 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+/* Written by Paul Eggert.  */
+
+#include <config.h>
+
+#include "timespec.h"
+
+#include <sys/time.h>
+#include <unistd.h>
+
+#include <errno.h>
+
+/* Set the system time.  */
+
+int
+settime (struct timespec const *ts)
+{
+#if defined CLOCK_REALTIME && HAVE_CLOCK_SETTIME
+  {
+    int r = clock_settime (CLOCK_REALTIME, ts);
+    if (r == 0 || errno == EPERM)
+      return r;
+  }
+#endif
+
+#if HAVE_SETTIMEOFDAY
+  {
+    struct timeval tv;
+
+    tv.tv_sec = ts->tv_sec;
+    tv.tv_usec = ts->tv_nsec / 1000;
+    return settimeofday (&tv, 0);
+  }
+#elif HAVE_STIME
+  /* This fails to compile on OSF1 V5.1, due to stime requiring
+     a 'long int*' and tv_sec is 'int'.  But that system does provide
+     settimeofday.  */
+  return stime (&ts->tv_sec);
+#else
+  errno = ENOSYS;
+  return -1;
+#endif
+}