From 8c7634d4a23349e3bb81520410ca8775e0084b5b Mon Sep 17 00:00:00 2001 From: patacongo Date: Sat, 18 Jul 2009 21:39:59 +0000 Subject: [PATCH] Add skeleton for fcntl() git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@1993 42af7a65-404d-4744-a932-0658087f49c3 --- fs/Makefile | 7 ++- fs/fs_fcntl.c | 160 ++++++++++++++++++++++++++++++++++++++++++++++++ include/fcntl.h | 8 ++- 3 files changed, 171 insertions(+), 4 deletions(-) create mode 100644 fs/fs_fcntl.c diff --git a/fs/Makefile b/fs/Makefile index 30073db9e0..5c1f037afd 100644 --- a/fs/Makefile +++ b/fs/Makefile @@ -44,9 +44,10 @@ ifneq ($(CONFIG_NSOCKET_DESCRIPTORS),0) CSRCS += fs_close.c fs_write.c fs_ioctl.c fs_poll.c fs_select.c endif else -CSRCS += fs_open.c fs_close.c fs_read.c fs_write.c fs_ioctl.c fs_poll.c \ - fs_select.c fs_lseek.c fs_dup.c fs_filedup.c fs_dup2.c fs_filedup2.c \ - fs_mmap.c fs_opendir.c fs_closedir.c fs_stat.c fs_readdir.c fs_readdirr.c \ +CSRCS += fs_open.c fs_close.c fs_read.c fs_write.c fs_ioctl.c \ + fs_poll.c fs_select.c fs_lseek.c fs_dup.c fs_filedup.c \ + fs_dup2.c fs_fcntl.c fs_filedup2.c fs_mmap.c fs_opendir.c \ + fs_closedir.c fs_stat.c fs_readdir.c fs_readdirr.c \ fs_seekdir.c fs_telldir.c fs_rewinddir.c fs_files.c fs_inode.c \ fs_inodefind.c fs_inodereserve.c fs_statfs.c fs_inoderemove.c \ fs_registerdriver.c fs_unregisterdriver.c fs_inodeaddref.c \ diff --git a/fs/fs_fcntl.c b/fs/fs_fcntl.c new file mode 100644 index 0000000000..2ca0923d8e --- /dev/null +++ b/fs/fs_fcntl.c @@ -0,0 +1,160 @@ +/**************************************************************************** + * fs/fs_fcntl.c + * + * Copyright (C) 2009 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt + * + * 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. Neither the name NuttX nor the names of its contributors may be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 + * COPYRIGHT OWNER 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. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include +#include + +#include +#include + +#include "fs_internal.h" + +/**************************************************************************** + * Global Functions + ****************************************************************************/ + +int fcntl(int fildes, int cmd, ...) +{ + int err = 0; + +#warning "fcntl() not yet implemented" + switch (cmd) + { + case F_DUPFD: + /* Return a new file descriptor which shall be the lowest numbered + * available (that is, not already open) file descriptor greater than + * or equal to the third argument, arg, taken as an integer of type + * int. The new file descriptor shall refer to the same open file + * description as the original file descriptor, and shall share any + * locks. The FD_CLOEXEC flag associated with the new file descriptor + * shall be cleared to keep the file open across calls to one of the + * exec functions. + */ + + case F_GETFD: + /* Get the file descriptor flags defined in that are associated + * with the file descriptor fildes. File descriptor flags are associated + * with a single file descriptor and do not affect other file descriptors + * that refer to the same file. + */ + + case F_SETFD: + /* Set the file descriptor flags defined in , that are associated + * with fildes, to the third argument, arg, taken as type int. If the + * FD_CLOEXEC flag in the third argument is 0, the file shall remain open + * across the exec functions; otherwise, the file shall be closed upon + * successful execution of one of the exec functions. + */ + + case F_GETFL: + /* Get the file status flags and file access modes, defined in , + * for the file description associated with fildes. The file access modes + * can be extracted from the return value using the mask O_ACCMODE, which is + * defined in . File status flags and file access modes are associated + * with the file description and do not affect other file descriptors that + * refer to the same file with different open file descriptions. + */ + + case F_SETFL: + /* Set the file status flags, defined in , for the file description + * associated with fildes from the corresponding bits in the third argument, + * arg, taken as type int. Bits corresponding to the file access mode and + * the file creation flags, as defined in , that are set in arg shall + * be ignored. If any bits in arg other than those mentioned here are changed + * by the application, the result is unspecified. + */ + + case F_GETOWN: + /* If fildes refers to a socket, get the process or process group ID specified + * to receive SIGURG signals when out-of-band data is available. Positive values + * indicate a process ID; negative values, other than -1, indicate a process group + * ID. If fildes does not refer to a socket, the results are unspecified. + */ + + case F_SETOWN: + /* If fildes refers to a socket, set the process or process group ID specified + * to receive SIGURG signals when out-of-band data is available, using the value + * of the third argument, arg, taken as type int. Positive values indicate a + * process ID; negative values, other than -1, indicate a process group ID. If + * fildes does not refer to a socket, the results are unspecified. + */ + + case F_GETLK: + /* Get the first lock which blocks the lock description pointed to by the third + * argument, arg, taken as a pointer to type struct flock, defined in . + * The information retrieved shall overwrite the information passed to fcntl() in + * the structure flock. If no lock is found that would prevent this lock from being + * created, then the structure shall be left unchanged except for the lock type + * which shall be set to F_UNLCK. + */ + + case F_SETLK: + /* Set or clear a file segment lock according to the lock description pointed to + * by the third argument, arg, taken as a pointer to type struct flock, defined in + * . F_SETLK can establish shared (or read) locks (F_RDLCK) or exclusive + * (or write) locks (F_WRLCK), as well as to remove either type of lock (F_UNLCK). + * F_RDLCK, F_WRLCK, and F_UNLCK are defined in . If a shared or exclusive + * lock cannot be set, fcntl() shall return immediately with a return value of -1. + */ + + case F_SETLKW: + /* This command shall be equivalent to F_SETLK except that if a shared or exclusive + * lock is blocked by other locks, the thread shall wait until the request can be + * satisfied. If a signal that is to be caught is received while fcntl() is waiting + * for a region, fcntl() shall be interrupted. Upon return from the signal handler, + * fcntl() shall return -1 with errno set to [EINTR], and the lock operation shall + * not be done. + */ + + err = ENOSYS; + break; + + default: + err = EINVAL; + break; + } + + if (err != 0) + { + errno = err; + return ERROR; + } + return OK; +} + diff --git a/include/fcntl.h b/include/fcntl.h index 66a66e0f5d..611a10d0a5 100644 --- a/include/fcntl.h +++ b/include/fcntl.h @@ -1,7 +1,7 @@ /******************************************************************************** * include/fcntl.h * - * Copyright (C) 2007, 2008 Gregory Nutt. All rights reserved. + * Copyright (C) 2007-2009 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * Redistribution and use in source and binary forms, with or without @@ -86,6 +86,12 @@ #define F_SETOWN 13 /* Set pid that will receive SIGIO and SIGURG signals for fd */ #define F_SETSIG 14 /* Set the signal to be sent */ +/* For posix fcntl() and lockf() */ + +#define F_RDLCK 0 +#define F_WRLCK 1 +#define F_UNLCK 2 + /* close-on-exec flag for F_GETRL and F_SETFL */ #define FD_CLOEXEC 1