Filesystem: Add kernel event filter handler

This handler is necessary to implement the KQUEUE(2) system calls.

Add <sys/event.h> from FreeBSD 8.4.

cpukit/Makefile.am

@@ -50,6 +50,7 @@ include_HEADERS += libmd/md4.h
 include_HEADERS += libmd/md5.h
 
 include_sys_HEADERS += libcsupport/include/sys/ioccom.h
+include_sys_HEADERS += libcsupport/include/sys/event.h
 include_sys_HEADERS += libcsupport/include/sys/filio.h
 include_sys_HEADERS += libcsupport/include/sys/ioctl.h
 include_sys_HEADERS += libcsupport/include/sys/poll.h

cpukit/libcsupport/include/rtems/libio.h

@@ -41,6 +41,8 @@
 extern "C" {
 #endif
 
+struct knote;
+
 /**
  * @defgroup LibIOFSOps File System Operations
  *
@@ -957,6 +959,22 @@ typedef int (*rtems_filesystem_poll_t)(
   int events
 );
 
+/**
+ * @brief Kernel event filter support.
+ *
+ * @param[in, out] iop The IO pointer.
+ * @param[in] kn The kernel event note.
+ *
+ * @retval 0 Successful operation.
+ * @retval error An error occurred.  This is usually EINVAL.
+ *
+ * @see rtems_filesystem_default_kqfilter().
+ */
+typedef int (*rtems_filesystem_kqfilter_t)(
+  rtems_libio_t *iop,
+  struct knote *kn
+);
+
 /**
  * @brief File system node operations table.
  */
@@ -973,6 +991,7 @@ struct _rtems_filesystem_file_handlers_r {
   rtems_filesystem_fdatasync_t fdatasync_h;
   rtems_filesystem_fcntl_t fcntl_h;
   rtems_filesystem_poll_t poll_h;
+  rtems_filesystem_kqfilter_t kqfilter_h;
 };
 
 /**
@@ -1158,6 +1177,18 @@ int rtems_filesystem_default_poll(
   int events
 );
 
+/**
+ * @brief Default kernel event filter handler.
+ *
+ * @retval EINVAL Always.
+ *
+ * @see rtems_filesystem_kqfilter_t.
+ */
+int rtems_filesystem_default_kqfilter(
+  rtems_libio_t *iop,
+  struct knote *kn
+);
+
 /** @} */
 
 /**

cpukit/libfs/Makefile.am

@@ -33,6 +33,7 @@ libdefaultfs_a_SOURCES = \
     src/defaults/default_node_type.c \
     src/defaults/default_ftruncate_directory.c \
     src/defaults/default_handlers.c src/defaults/default_ops.c
+libdefaultfs_a_SOURCES += src/defaults/default_kqfilter.c
 libdefaultfs_a_SOURCES += src/defaults/default_poll.c
 
 noinst_LIBRARIES += libimfs.a

cpukit/libfs/src/defaults/default_kqfilter.c

@@ -0,0 +1,38 @@
+/**
+ * @file
+ *
+ * @brief Default Kernel Event Filter Handler
+ *
+ * @ingroup LibIOFSHandler
+ */
+
+/*
+ * Copyright (c) 2013 embedded brains GmbH.  All rights reserved.
+ *
+ *  embedded brains GmbH
+ *  Dornierstr. 4
+ *  82178 Puchheim
+ *  Germany
+ *  <rtems@embedded-brains.de>
+ *
+ * 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.
+ */
+
+#if HAVE_CONFIG_H
+  #include "config.h"
+#endif
+
+#include <rtems/libio_.h>
+
+#include <sys/types.h>
+#include <sys/event.h>
+
+int rtems_filesystem_default_kqfilter(
+  rtems_libio_t *iop,
+  struct knote *kn
+)
+{
+  return EINVAL;
+}

cpukit/preinstall.am

@@ -68,6 +68,10 @@ $(PROJECT_INCLUDE)/sys/ioccom.h: libcsupport/include/sys/ioccom.h $(PROJECT_INCL
 	$(INSTALL_DATA) $< $(PROJECT_INCLUDE)/sys/ioccom.h
 PREINSTALL_FILES += $(PROJECT_INCLUDE)/sys/ioccom.h
 
+$(PROJECT_INCLUDE)/sys/event.h: libcsupport/include/sys/event.h $(PROJECT_INCLUDE)/sys/$(dirstamp)
+	$(INSTALL_DATA) $< $(PROJECT_INCLUDE)/sys/event.h
+PREINSTALL_FILES += $(PROJECT_INCLUDE)/sys/event.h
+
 $(PROJECT_INCLUDE)/sys/filio.h: libcsupport/include/sys/filio.h $(PROJECT_INCLUDE)/sys/$(dirstamp)
 	$(INSTALL_DATA) $< $(PROJECT_INCLUDE)/sys/filio.h
 PREINSTALL_FILES += $(PROJECT_INCLUDE)/sys/filio.h