1 files changed, 113 insertions, 0 deletions
diff --git a/cpukit/posix/src/psignalchecksignal.c b/cpukit/posix/src/psignalchecksignal.c
new file mode 100644
index 0000000000..8bba7a4226
--- /dev/null
+++ b/cpukit/posix/src/psignalchecksignal.c
@@ -0,0 +1,113 @@
+/*
+ *  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
+
+#if defined(RTEMS_DEBUG)
+  #include <assert.h>
+#endif
+#include <errno.h>
+#include <pthread.h>
+#include <signal.h>
+#include <string.h>
+
+#include <rtems/system.h>
+#include <rtems/score/isr.h>
+#include <rtems/score/thread.h>
+#include <rtems/score/tqdata.h>
+#include <rtems/score/wkspace.h>
+#include <rtems/seterr.h>
+#include <rtems/posix/threadsup.h>
+#include <rtems/posix/psignal.h>
+#include <rtems/posix/pthread.h>
+#include <rtems/posix/time.h>
+#include <stdio.h>
+
+
+/*PAGE
+ *
+ *  _POSIX_signals_Check_signal
+ */
+
+bool    _POSIX_signals_Check_signal(
+  POSIX_API_Control  *api,
+  int                 signo,
+  bool                is_global
+)
+{
+  siginfo_t                   siginfo_struct;
+  sigset_t                    saved_signals_blocked;
+  Thread_Wait_information     stored_thread_wait_information;
+
+  if ( ! _POSIX_signals_Clear_signals( api, signo, &siginfo_struct,
+                                       is_global, true ) )
+    return false;
+
+  /*
+   *  Since we made a union of these, only one test is necessary but this is
+   *  safer.
+   */
+  #if defined(RTEMS_DEBUG)
+    assert( _POSIX_signals_Vectors[ signo ].sa_handler ||
+            _POSIX_signals_Vectors[ signo ].sa_sigaction );
+  #endif
+
+  /*
+   *  Just to prevent sending a signal which is currently being ignored.
+   */
+  if ( _POSIX_signals_Vectors[ signo ].sa_handler == SIG_IGN )
+    return false;
+
+  /*
+   *  Block the signals requested in sa_mask
+   */
+  saved_signals_blocked = api->signals_blocked;
+  api->signals_blocked |= _POSIX_signals_Vectors[ signo ].sa_mask;
+
+  /*
+   *  We have to save the blocking information of the current wait queue
+   *  because the signal handler may subsequently go on and put the thread
+   *  on a wait queue, for its own purposes.
+   */
+  memcpy( &stored_thread_wait_information, &_Thread_Executing->Wait,
+          sizeof( Thread_Wait_information ));
+
+  /*
+   *  Here, the signal handler function executes
+   */
+  switch ( _POSIX_signals_Vectors[ signo ].sa_flags ) {
+    case SA_SIGINFO:
+      (*_POSIX_signals_Vectors[ signo ].sa_sigaction)(
+        signo,
+        &siginfo_struct,
+        NULL        /* context is undefined per 1003.1b-1993, p. 66 */
+      );
+      break;
+    default:
+      (*_POSIX_signals_Vectors[ signo ].sa_handler)( signo );
+      break;
+  }
+
+  /*
+   *  Restore the blocking information
+   */
+  memcpy( &_Thread_Executing->Wait, &stored_thread_wait_information,
+          sizeof( Thread_Wait_information ));
+
+  /*
+   *  Restore the previous set of blocked signals
+   */
+  api->signals_blocked = saved_signals_blocked;
+
+  return true;
+}