1 files changed, 76 insertions, 0 deletions
diff --git a/cpukit/posix/src/alarm.c b/cpukit/posix/src/alarm.c
new file mode 100644
index 0000000000..ec381878a5
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+++ b/cpukit/posix/src/alarm.c
@@ -0,0 +1,76 @@
+/*
+ *  3.4.1 Schedule Alarm, P1003.1b-1993, p. 79
+ */
+
+/*  COPYRIGHT (c) 1989-2007.
+ *  On-Line Applications Research Corporation (OAR).
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.rtems.com/license/LICENSE.
+ *
+ *  $Id$
+ */
+
+#if HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <pthread.h>
+
+#include <rtems/system.h>
+#include <rtems/posix/pthread.h>
+#include <rtems/posix/psignal.h>
+
+/*PAGE
+ *
+ *  _POSIX_signals_Alarm_TSR
+ */
+
+void _POSIX_signals_Alarm_TSR(
+  Objects_Id      id __attribute__((unused)),
+  void           *argument __attribute__((unused))
+)
+{
+  int status;
+
+  status = kill( getpid(), SIGALRM );
+  /* XXX can't print from an ISR, should this be fatal? */
+}
+
+unsigned int alarm(
+  unsigned int seconds
+)
+{
+  unsigned int      remaining = 0;
+  Watchdog_Control *the_timer;
+
+  the_timer = &_POSIX_signals_Alarm_timer;
+
+  /*
+   *  Initialize the timer used to implement alarm().
+   */
+
+  if ( !the_timer->routine ) {
+    _Watchdog_Initialize( the_timer, _POSIX_signals_Alarm_TSR, 0, NULL );
+  } else {
+    Watchdog_States state;
+
+    state = _Watchdog_Remove( the_timer );
+    if ( (state == WATCHDOG_ACTIVE) || (state == WATCHDOG_REMOVE_IT) ) {
+      /*
+       *  The stop_time and start_time fields are snapshots of ticks since
+       *  boot.  Since alarm() is dealing in seconds, we must account for
+       *  this.
+       */
+
+      remaining = the_timer->initial -
+        ((the_timer->stop_time - the_timer->start_time) / TOD_TICKS_PER_SECOND);
+    }
+  }
+
+  if ( seconds )
+    _Watchdog_Insert_seconds( the_timer, seconds );
+
+  return remaining;
+}