Filesystem: Add poll() handler

This handler is necessary to implement the SELECT(2) and POLL(2) system
calls.

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

cpukit/Makefile.am

@@ -52,6 +52,7 @@ include_HEADERS += libmd/md5.h
 include_sys_HEADERS += libcsupport/include/sys/ioccom.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
 include_sys_HEADERS += libcsupport/include/sys/statvfs.h
 include_sys_HEADERS += libcsupport/include/sys/sockio.h
 include_sys_HEADERS += libcsupport/include/sys/ttycom.h

cpukit/libcsupport/include/rtems/libio.h

@@ -942,6 +942,21 @@ typedef int (*rtems_filesystem_fcntl_t)(
   int cmd
 );
 
+/**
+ * @brief Poll and select support.
+ *
+ * @param[in, out] iop The IO pointer.
+ * @param[in] events The poll events.
+ *
+ * @return The poll return events.
+ *
+ * @see rtems_filesystem_default_poll().
+ */
+typedef int (*rtems_filesystem_poll_t)(
+  rtems_libio_t *iop,
+  int events
+);
+
 /**
  * @brief File system node operations table.
  */
@@ -957,6 +972,7 @@ struct _rtems_filesystem_file_handlers_r {
   rtems_filesystem_fsync_t fsync_h;
   rtems_filesystem_fdatasync_t fdatasync_h;
   rtems_filesystem_fcntl_t fcntl_h;
+  rtems_filesystem_poll_t poll_h;
 };
 
 /**
@@ -1130,6 +1146,18 @@ int rtems_filesystem_default_fcntl(
   int cmd
 );
 
+/**
+ * @brief Default poll handler.
+ *
+ * @retval POLLERR Always.
+ *
+ * @see rtems_filesystem_poll_t.
+ */
+int rtems_filesystem_default_poll(
+  rtems_libio_t *iop,
+  int events
+);
+
 /** @} */
 
 /**

cpukit/libcsupport/include/sys/poll.h

@@ -0,0 +1,104 @@
+/*-
+ * Copyright (c) 1997 Peter Wemm <peter@freebsd.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef _SYS_POLL_H_
+#define	_SYS_POLL_H_
+
+#include <sys/cdefs.h>
+
+/*
+ * This file is intended to be compatible with the traditional poll.h.
+ */
+
+typedef	unsigned int	nfds_t;
+
+/*
+ * This structure is passed as an array to poll(2).
+ */
+struct pollfd {
+	int	fd;		/* which file descriptor to poll */
+	short	events;		/* events we are interested in */
+	short	revents;	/* events found on return */
+};
+
+/*
+ * Requestable events.  If poll(2) finds any of these set, they are
+ * copied to revents on return.
+ * XXX Note that FreeBSD doesn't make much distinction between POLLPRI
+ * and POLLRDBAND since none of the file types have distinct priority
+ * bands - and only some have an urgent "mode".
+ * XXX Note POLLIN isn't really supported in true SVSV terms.  Under SYSV
+ * POLLIN includes all of normal, band and urgent data.  Most poll handlers
+ * on FreeBSD only treat it as "normal" data.
+ */
+#define	POLLIN		0x0001		/* any readable data available */
+#define	POLLPRI		0x0002		/* OOB/Urgent readable data */
+#define	POLLOUT		0x0004		/* file descriptor is writeable */
+#define	POLLRDNORM	0x0040		/* non-OOB/URG data available */
+#define	POLLWRNORM	POLLOUT		/* no write type differentiation */
+#define	POLLRDBAND	0x0080		/* OOB/Urgent readable data */
+#define	POLLWRBAND	0x0100		/* OOB/Urgent data can be written */
+
+#if __BSD_VISIBLE
+/* General FreeBSD extension (currently only supported for sockets): */
+#define	POLLINIGNEOF	0x2000		/* like POLLIN, except ignore EOF */
+#endif
+
+/*
+ * These events are set if they occur regardless of whether they were
+ * requested.
+ */
+#define	POLLERR		0x0008		/* some poll error occurred */
+#define	POLLHUP		0x0010		/* file descriptor was "hung up" */
+#define	POLLNVAL	0x0020		/* requested events "invalid" */
+
+#if __BSD_VISIBLE
+
+#define	POLLSTANDARD	(POLLIN|POLLPRI|POLLOUT|POLLRDNORM|POLLRDBAND|\
+			 POLLWRBAND|POLLERR|POLLHUP|POLLNVAL)
+
+/*
+ * Request that poll() wait forever.
+ * XXX in SYSV, this is defined in stropts.h, which is not included
+ * by poll.h.
+ */
+#define	INFTIM		(-1)
+
+#endif
+
+#ifndef _KERNEL
+
+__BEGIN_DECLS
+int	poll(struct pollfd _pfd[], nfds_t _nfds, int _timeout);
+__END_DECLS
+
+#endif /* !_KERNEL */
+
+#endif /* !_SYS_POLL_H_ */

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_poll.c
 
 noinst_LIBRARIES += libimfs.a
 libimfs_a_SOURCES =

cpukit/libfs/src/defaults/default_poll.c

@@ -0,0 +1,37 @@
+/**
+ * @file
+ *
+ * @brief Default Poll 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/poll.h>
+
+int rtems_filesystem_default_poll(
+  rtems_libio_t *iop,
+  int events
+)
+{
+  return POLLERR;
+}

cpukit/preinstall.am

@@ -76,6 +76,10 @@ $(PROJECT_INCLUDE)/sys/ioctl.h: libcsupport/include/sys/ioctl.h $(PROJECT_INCLUD
 	$(INSTALL_DATA) $< $(PROJECT_INCLUDE)/sys/ioctl.h
 PREINSTALL_FILES += $(PROJECT_INCLUDE)/sys/ioctl.h
 
+$(PROJECT_INCLUDE)/sys/poll.h: libcsupport/include/sys/poll.h $(PROJECT_INCLUDE)/sys/$(dirstamp)
+	$(INSTALL_DATA) $< $(PROJECT_INCLUDE)/sys/poll.h
+PREINSTALL_FILES += $(PROJECT_INCLUDE)/sys/poll.h
+
 $(PROJECT_INCLUDE)/sys/statvfs.h: libcsupport/include/sys/statvfs.h $(PROJECT_INCLUDE)/sys/$(dirstamp)
 	$(INSTALL_DATA) $< $(PROJECT_INCLUDE)/sys/statvfs.h
 PREINSTALL_FILES += $(PROJECT_INCLUDE)/sys/statvfs.h