2006-11-15 Joel Sherrill <joel.sherrill@oarcorp.com>

	* posix/Makefile.am: Add file missed in previous commit.
	* posix/src/posixtimespecabsolutetimeout.c: New file.

1 files changed, 69 insertions, 0 deletions

diff --git a/cpukit/posix/src/posixtimespecabsolutetimeout.c b/cpukit/posix/src/posixtimespecabsolutetimeout.c
new file mode 100644
index 0000000000..df70c90533
--- /dev/null
+++ b/cpukit/posix/src/posixtimespecabsolutetimeout.c
@@ -0,0 +1,69 @@
+/*
+ *  Convert abstime timeout to ticks
+ *
+ *  $Id$
+ */
+
+#if HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <stdarg.h>
+
+#include <errno.h>
+#include <fcntl.h>
+#include <pthread.h>
+#include <semaphore.h>
+#include <limits.h>
+
+#include <rtems/system.h>
+#include <rtems/score/object.h>
+#include <rtems/posix/semaphore.h>
+#include <rtems/posix/time.h>
+#include <rtems/seterr.h>
+
+/*
+ *  The abstime is a walltime.  We turn it into an interval.
+ */
+int _POSIX_Absolute_timeout_to_ticks(
+  const struct timespec *abstime,
+  Watchdog_Interval     *ticks_out
+)
+{
+  struct timespec   current_time;
+  struct timespec   difference;
+
+  if ( !abstime )
+    return EINVAL;
+
+  /*
+   *  Error check the absolute time to timeout
+   */
+#if 0
+   /* they are unsigned so this is impossible */
+  if ( abstime->tv_sec < 0 || abstime->tv_nsec < 0 )
+    return EINVAL;
+#endif
+
+  if ( abstime->tv_nsec >= TOD_NANOSECONDS_PER_SECOND )
+    return EINVAL;
+  
+  (void) clock_gettime( CLOCK_REALTIME, &current_time );
+
+  /*
+   *  Make sure the abstime is in the future
+   */
+  if ( abstime->tv_sec < current_time.tv_sec )
+    return EINVAL;
+
+  if ( (abstime->tv_sec == current_time.tv_sec) &&
+       (abstime->tv_nsec <= current_time.tv_nsec) )
+    return EINVAL;
+
+  _POSIX_Timespec_subtract( &current_time, abstime, &difference );
+
+  *ticks_out = _POSIX_Timespec_to_interval( &difference );
+
+  return 0;
+}
+