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Basic file structure for poll() API
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@1257 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo
parent
85911f6a9d
commit
57c41ff2fc
3 changed files with 227 additions and 5 deletions
10
fs/Makefile
10
fs/Makefile
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@ -41,13 +41,13 @@ AOBJS = $(ASRCS:.S=$(OBJEXT))
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CSRCS =
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ifeq ($(CONFIG_NFILE_DESCRIPTORS),0)
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ifneq ($(CONFIG_NSOCKET_DESCRIPTORS),0)
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CSRCS += fs_close.c fs_write.c fs_ioctl.c
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CSRCS += fs_close.c fs_write.c fs_ioctl.c fs_poll.c
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endif
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else
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CSRCS += fs_open.c fs_close.c fs_read.c fs_write.c fs_ioctl.c fs_lseek.c \
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fs_dup.c fs_mmap.c fs_opendir.c fs_closedir.c fs_stat.c fs_readdir.c \
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fs_readdirr.c fs_seekdir.c fs_telldir.c fs_rewinddir.c fs_files.c \
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fs_inode.c fs_inodefind.c fs_inodereserve.c fs_statfs.c \
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CSRCS += fs_open.c fs_close.c fs_read.c fs_write.c fs_ioctl.c fs_poll.c \
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fs_lseek.c fs_dup.c fs_mmap.c fs_opendir.c fs_closedir.c fs_stat.c \
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fs_readdir.c fs_readdirr.c fs_seekdir.c fs_telldir.c fs_rewinddir.c \
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fs_files.c fs_inode.c fs_inodefind.c fs_inodereserve.c fs_statfs.c \
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fs_inoderemove.c fs_registerdriver.c fs_unregisterdriver.c \
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fs_inodeaddref.c fs_inoderelease.c
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CSRCS += fs_registerblockdriver.c fs_unregisterblockdriver.c \
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97
fs/fs_poll.c
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97
fs/fs_poll.c
Normal file
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@ -0,0 +1,97 @@
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/****************************************************************************
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* fs/fs_poll.c
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*
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* Copyright (C) 2008 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <poll.h>
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#include <errno.h>
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#include <nuttx/fs.h>
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#include "fs_internal.h"
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: poll
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*
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* Description:
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* poll() waits for one of a set of file descriptors to become ready to
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* perform I/O. If none of the events requested (and no error) has
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* occurred for any of the file descriptors, then poll() blocks until
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* one of the events occurs.
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*
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* Inputs:
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* fds - List of structures describing file descriptors to be monitored
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* nfds - The number of entries in the list
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* timeout - Specifies an upper limit on the time for which poll() will
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* block in milliseconds. A negative value of timeout means an infinite
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* timeout.
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*
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* Return:
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* On success, the number of structures that have nonzero revents fields.
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* A value of 0 indicates that the call timed out and no file descriptors
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* were ready. On error, -1 is returned, and errno is set appropriately:
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*
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* EBADF - An invalid file descriptor was given in one of the sets.
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* EFAULT - The fds address is invalid
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* EINTR - A signal occurred before any requested event.
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* EINVAL - The nfds value exceeds a system limit.
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* ENOMEM - There was no space to allocate internal data structures.
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* ENOSYS - One or more of the drivers supporting the file descriptor
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* does not support the poll method.
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*
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****************************************************************************/
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int poll(FAR struct pollfd *fds, nfds_t nfds, int timeout)
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{
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#ifdef CONFIG_CPP_HAVE_WARNING
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# warning To be provided
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#endif
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errno = ENOSYS;
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return ERROR;
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}
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125
include/poll.h
Normal file
125
include/poll.h
Normal file
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@ -0,0 +1,125 @@
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/****************************************************************************
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* include/poll.h
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*
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* Copyright (C) 2008 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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#ifndef __INCLUDE_POLL_H
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#define __INCLUDE_POLL_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <semaphore.h>
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/****************************************************************************
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* Definitions
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****************************************************************************/
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/* Poll event definitions:
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*
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* POLLIN
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* Data other than high-priority data may be read without blocking.
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* POLLRDNORM
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* Normal data may be read without blocking.
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* POLLRDBAND
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* Priority data may be read without blocking.
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* POLLPRI
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* High priority data may be read without blocking.
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* POLLOUT
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* Normal data may be written without blocking.
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* POLLWRNORM
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* Equivalent to POLLOUT.
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* POLLWRBAND
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* Priority data may be written.
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* POLLERR
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* An error has occurred (revents only).
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* POLLHUP
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* Device has been disconnected (revents only).
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* POLLNVAL
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* Invalid fd member (revents only).
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*/
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#define POLLIN (0x01) /* NuttX does not make priority distinctions */
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#define POLLRDNORM (0x01)
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#define POLLRDBAND (0x01)
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#define POLLPRI (0x01)
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#define POLLOUT (0x02) /* NuttX does not make priority distinctions */
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#define POLLWRNORM (0x02)
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#define POLLWRBAND (0x02)
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#define POLLERR (0x04)
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#define POLLHUP (0x08)
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#define POLLNVAL (0x10)
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/****************************************************************************
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* Public Type Definitions
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****************************************************************************/
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typedef unsigned int nfds_t;
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struct pollfd
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{
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int fd; /* The descriptor being polled */
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sem_t *sem; /* Pointer to semaphore used to post output event */
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ubyte events; /* The input event flags */
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ubyte revents; /* The output event flags */
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};
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/****************************************************************************
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* Public Variables
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****************************************************************************/
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#undef EXTERN
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#if defined(__cplusplus)
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#define EXTERN extern "C"
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extern "C" {
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#else
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#define EXTERN extern
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#endif
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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EXTERN int poll(FAR struct pollfd *fds, nfds_t nfds, int timeout);
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#undef EXTERN
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#if defined(__cplusplus)
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}
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#endif
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#endif /* __INCLUDE_POLL_H */
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