Add skeleton for fcntl()
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@1993 42af7a65-404d-4744-a932-0658087f49c3
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patacongo
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@ -44,9 +44,10 @@ ifneq ($(CONFIG_NSOCKET_DESCRIPTORS),0)
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CSRCS += fs_close.c fs_write.c fs_ioctl.c fs_poll.c fs_select.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_poll.c \
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fs_select.c fs_lseek.c fs_dup.c fs_filedup.c fs_dup2.c fs_filedup2.c \
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fs_mmap.c fs_opendir.c fs_closedir.c fs_stat.c fs_readdir.c fs_readdirr.c \
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CSRCS += fs_open.c fs_close.c fs_read.c fs_write.c fs_ioctl.c \
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fs_poll.c fs_select.c fs_lseek.c fs_dup.c fs_filedup.c \
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fs_dup2.c fs_fcntl.c fs_filedup2.c fs_mmap.c fs_opendir.c \
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fs_closedir.c fs_stat.c fs_readdir.c fs_readdirr.c \
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fs_seekdir.c fs_telldir.c fs_rewinddir.c fs_files.c fs_inode.c \
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fs_inodefind.c fs_inodereserve.c fs_statfs.c fs_inoderemove.c \
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fs_registerdriver.c fs_unregisterdriver.c fs_inodeaddref.c \
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@ -0,0 +1,160 @@
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/****************************************************************************
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* fs/fs_fcntl.c
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*
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* Copyright (C) 2009 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 <fcntl.h>
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#include <errno.h>
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#include "fs_internal.h"
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/****************************************************************************
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* Global Functions
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****************************************************************************/
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int fcntl(int fildes, int cmd, ...)
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{
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int err = 0;
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#warning "fcntl() not yet implemented"
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switch (cmd)
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{
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case F_DUPFD:
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/* Return a new file descriptor which shall be the lowest numbered
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* available (that is, not already open) file descriptor greater than
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* or equal to the third argument, arg, taken as an integer of type
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* int. The new file descriptor shall refer to the same open file
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* description as the original file descriptor, and shall share any
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* locks. The FD_CLOEXEC flag associated with the new file descriptor
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* shall be cleared to keep the file open across calls to one of the
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* exec functions.
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*/
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case F_GETFD:
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/* Get the file descriptor flags defined in <fcntl.h> that are associated
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* with the file descriptor fildes. File descriptor flags are associated
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* with a single file descriptor and do not affect other file descriptors
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* that refer to the same file.
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*/
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case F_SETFD:
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/* Set the file descriptor flags defined in <fcntl.h>, that are associated
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* with fildes, to the third argument, arg, taken as type int. If the
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* FD_CLOEXEC flag in the third argument is 0, the file shall remain open
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* across the exec functions; otherwise, the file shall be closed upon
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* successful execution of one of the exec functions.
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*/
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case F_GETFL:
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/* Get the file status flags and file access modes, defined in <fcntl.h>,
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* for the file description associated with fildes. The file access modes
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* can be extracted from the return value using the mask O_ACCMODE, which is
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* defined in <fcntl.h>. File status flags and file access modes are associated
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* with the file description and do not affect other file descriptors that
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* refer to the same file with different open file descriptions.
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*/
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case F_SETFL:
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/* Set the file status flags, defined in <fcntl.h>, for the file description
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* associated with fildes from the corresponding bits in the third argument,
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* arg, taken as type int. Bits corresponding to the file access mode and
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* the file creation flags, as defined in <fcntl.h>, that are set in arg shall
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* be ignored. If any bits in arg other than those mentioned here are changed
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* by the application, the result is unspecified.
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*/
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case F_GETOWN:
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/* If fildes refers to a socket, get the process or process group ID specified
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* to receive SIGURG signals when out-of-band data is available. Positive values
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* indicate a process ID; negative values, other than -1, indicate a process group
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* ID. If fildes does not refer to a socket, the results are unspecified.
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*/
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case F_SETOWN:
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/* If fildes refers to a socket, set the process or process group ID specified
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* to receive SIGURG signals when out-of-band data is available, using the value
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* of the third argument, arg, taken as type int. Positive values indicate a
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* process ID; negative values, other than -1, indicate a process group ID. If
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* fildes does not refer to a socket, the results are unspecified.
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*/
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case F_GETLK:
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/* Get the first lock which blocks the lock description pointed to by the third
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* argument, arg, taken as a pointer to type struct flock, defined in <fcntl.h>.
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* The information retrieved shall overwrite the information passed to fcntl() in
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* the structure flock. If no lock is found that would prevent this lock from being
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* created, then the structure shall be left unchanged except for the lock type
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* which shall be set to F_UNLCK.
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*/
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case F_SETLK:
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/* Set or clear a file segment lock according to the lock description pointed to
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* by the third argument, arg, taken as a pointer to type struct flock, defined in
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* <fcntl.h>. F_SETLK can establish shared (or read) locks (F_RDLCK) or exclusive
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* (or write) locks (F_WRLCK), as well as to remove either type of lock (F_UNLCK).
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* F_RDLCK, F_WRLCK, and F_UNLCK are defined in <fcntl.h>. If a shared or exclusive
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* lock cannot be set, fcntl() shall return immediately with a return value of -1.
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*/
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case F_SETLKW:
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/* This command shall be equivalent to F_SETLK except that if a shared or exclusive
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* lock is blocked by other locks, the thread shall wait until the request can be
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* satisfied. If a signal that is to be caught is received while fcntl() is waiting
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* for a region, fcntl() shall be interrupted. Upon return from the signal handler,
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* fcntl() shall return -1 with errno set to [EINTR], and the lock operation shall
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* not be done.
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*/
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err = ENOSYS;
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break;
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default:
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err = EINVAL;
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break;
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}
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if (err != 0)
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{
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errno = err;
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return ERROR;
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}
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return OK;
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}
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@ -1,7 +1,7 @@
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/********************************************************************************
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* include/fcntl.h
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*
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* Copyright (C) 2007, 2008 Gregory Nutt. All rights reserved.
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* Copyright (C) 2007-2009 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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@ -86,6 +86,12 @@
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#define F_SETOWN 13 /* Set pid that will receive SIGIO and SIGURG signals for fd */
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#define F_SETSIG 14 /* Set the signal to be sent */
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/* For posix fcntl() and lockf() */
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#define F_RDLCK 0
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#define F_WRLCK 1
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#define F_UNLCK 2
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/* close-on-exec flag for F_GETRL and F_SETFL */
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#define FD_CLOEXEC 1
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