AIX gettimeofday implementation.

diff --git a/sysdeps/unix/sysv/aix/gettimeofday.c b/sysdeps/unix/sysv/aix/gettimeofday.c
new file mode 100644 (file)
index 0000000..6b5bd48
--- /dev/null
+++ b/sysdeps/unix/sysv/aix/gettimeofday.c
@@ -0,0 +1,94 @@
+/* Copyright (C) 1991, 92, 94, 95, 96, 97 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <errno.h>
+#include <time.h>
+#include <sys/time.h>
+
+#ifndef HAVE_GNU_LD
+#define __daylight     daylight
+#define __timezone     timezone
+#define __tzname       tzname
+#endif
+
+/* Assembler Routines to access the timer registers */
+asm("
+.rtc_upper: mfspr   3,4         # copy RTCU to return register
+            blr
+
+.rtc_lower: mfspr   3,5         # copy RTCL to return register
+            blr
+");
+
+/* Get the current time of day and timezone information,
+   putting it into *TV and *TZ.  If TZ is NULL, *TZ is not filled.
+   Returns 0 on success, -1 on errors.  */
+int
+__gettimeofday (tv, tz)
+     struct timeval  *tv;
+     struct timezone *tz;
+{
+  int ts, tl, tu;
+
+  if (tv == NULL)
+    {
+      __set_errno (EINVAL);
+      return -1;
+    }
+
+  ts = rtc_upper();      /* seconds                         */
+  tl = rtc_lower();      /* nanoseconds                     */
+  tu = rtc_upper();      /* Check for a carry from          */
+  if (ts != tu)          /* the lower reg to the upper      */
+      tl  = rtc_lower(); /* Recover from the race condition */
+
+  tv->tv_sec  = (long int) (tu + (double)tl/1000000000); 
+  tv->tv_usec = (long int) ((double)tl/1000);
+
+#if 0
+  if (tz != NULL)
+    {
+      const  time_t timer = tv->tv_sec;
+      struct tm tm;
+      const  struct tm *tmp;
+
+      const long int save_timezone = __timezone;
+      const long int save_daylight = __daylight;
+      char *save_tzname[2];
+      save_tzname[0] = __tzname[0];
+      save_tzname[1] = __tzname[1];
+
+      tmp = localtime_r (&timer, &tm);
+
+      tz->tz_minuteswest = __timezone / 60;
+      tz->tz_dsttime     = __daylight;
+
+      __timezone  = save_timezone;
+      __daylight  = save_daylight;
+      __tzname[0] = save_tzname[0];
+      __tzname[1] = save_tzname[1];
+
+      if (tmp == NULL)
+       return -1;
+    }
+#endif
+
+  return 0;
+}
+
+weak_alias (__gettimeofday, gettimeofday)