252 lines
9.7 KiB
C
252 lines
9.7 KiB
C
/****************************************************************************
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* net/socket/net_vfcntl.c
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*
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* Copyright (C) 2009, 2012-2014 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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/socket.h>
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#include <stdint.h>
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#include <stdarg.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <arch/irq.h>
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#include <nuttx/net/net.h>
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#include "socket/socket.h"
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#if defined(CONFIG_NET) && CONFIG_NSOCKET_DESCRIPTORS > 0
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/****************************************************************************
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* Pre-Processor Definitions
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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: net_vfcntl
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*
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* Description:
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* Performs fcntl operations on socket
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*
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* Input Parameters:
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* sockfd - Socket descriptor of the socket to operate on
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* cmd - The fcntl command.
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* ap - Command-specific arguments
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*
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* Returned Value:
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* Zero (OK) is returned on success; -1 (ERROR) is returned on failure and
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* the errno value is set appropriately.
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*
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****************************************************************************/
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int net_vfcntl(int sockfd, int cmd, va_list ap)
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{
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FAR struct socket *psock = sockfd_socket(sockfd);
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net_lock_t flags;
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int err = 0;
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int ret = 0;
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/* Verify that the sockfd corresponds to valid, allocated socket */
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if (!psock || psock->s_crefs <= 0)
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{
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err = EBADF;
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goto errout;
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}
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/* Interrupts must be disabled in order to perform operations on socket structures */
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flags = net_lock();
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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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{
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ret = net_dup(sockfd, va_arg(ap, int));
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}
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break;
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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 fd. 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 fd, 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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err = ENOSYS; /* F_GETFD and F_SETFD not implemented */
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break;
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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 fd. 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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{
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/* This summarizes the behavior of the NuttX/uIP sockets */
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ret = O_RDWR | O_SYNC | O_RSYNC;
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#ifdef CONFIG_NET_TCP_READAHEAD
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/* TCP/IP sockets may also be non-blocking if read-ahead is enabled */
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if (psock->s_type == SOCK_STREAM && _SS_ISNONBLOCK(psock->s_flags))
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{
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ret |= O_NONBLOCK;
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}
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#endif
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}
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break;
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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 fd 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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{
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#ifdef CONFIG_NET_TCP_READAHEAD
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/* Non-blocking is the only configurable option. And it applies only to
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* read operations on TCP/IP sockets when read-ahead is enabled.
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*/
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int mode = va_arg(ap, int);
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if (psock->s_type == SOCK_STREAM)
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{
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if ((mode & O_NONBLOCK) != 0)
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{
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psock->s_flags |= _SF_NONBLOCK;
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}
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else
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{
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psock->s_flags &= ~_SF_NONBLOCK;
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}
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}
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#endif
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}
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break;
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case F_GETOWN:
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/* If fd 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 fd 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 fd 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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* fd 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; /* F_GETOWN, F_SETOWN, F_GETLK, F_SETLK, F_SETLKW */
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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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net_unlock(flags);
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errout:
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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 ret;
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}
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#endif /* CONFIG_NET && CONFIG_NSOCKET_DESCRIPTORS > 0 */
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