diff options
author | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2013-10-31 15:00:14 +0100 |
---|---|---|
committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2013-11-04 15:22:47 +0100 |
commit | 16829460572c9d8451154b2c296ac1abb7701b78 (patch) | |
tree | c92fd3fed60437b55a04f7d7e451dd636ec44da5 /cpukit/libcsupport/include | |
parent | bsp/realview-pbx-a9: Add NULL pointer protection (diff) | |
download | rtems-16829460572c9d8451154b2c296ac1abb7701b78.tar.bz2 |
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.
Diffstat (limited to 'cpukit/libcsupport/include')
-rw-r--r-- | cpukit/libcsupport/include/rtems/libio.h | 28 | ||||
-rw-r--r-- | cpukit/libcsupport/include/sys/poll.h | 104 |
2 files changed, 132 insertions, 0 deletions
diff --git a/cpukit/libcsupport/include/rtems/libio.h b/cpukit/libcsupport/include/rtems/libio.h index aa64ff35c4..a6420620c3 100644 --- a/cpukit/libcsupport/include/rtems/libio.h +++ b/cpukit/libcsupport/include/rtems/libio.h @@ -943,6 +943,21 @@ typedef int (*rtems_filesystem_fcntl_t)( ); /** + * @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. */ struct _rtems_filesystem_file_handlers_r { @@ -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 +); + /** @} */ /** diff --git a/cpukit/libcsupport/include/sys/poll.h b/cpukit/libcsupport/include/sys/poll.h new file mode 100644 index 0000000000..c955f321c7 --- /dev/null +++ b/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_ */ |