351 lines
12 KiB
C
351 lines
12 KiB
C
/****************************************************************************
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* net/socket/net_vfcntl.c
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*
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* Copyright (C) 2009, 2012-2015, 2017 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 <debug.h>
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#include <assert.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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#include "usrsock/usrsock.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: psock_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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* psock - An instance of the internal socket structure.
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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; a negated errno value is returned on
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* any failure to indicate the nature of the failure.
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*
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****************************************************************************/
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int psock_vfcntl(FAR struct socket *psock, int cmd, va_list ap)
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{
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int ret = -EINVAL;
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ninfo("sockfd=%p cmd=%d\n", psock, cmd);
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/* Verify that the sockfd corresponds to valid, allocated socket */
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if (psock == NULL || psock->s_crefs <= 0)
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{
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return -EBADF;
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}
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/* Interrupts must be disabled in order to perform operations on socket
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* structures
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*/
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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
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* descriptor shall be cleared to keep the file open across calls
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* to one of the exec functions.
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*/
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{
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/* Does not set the errno value on failure */
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ret = psock_dup(psock, 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
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* associated with the file descriptor fd. File descriptor flags
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* are associated with a single file descriptor and do not affect
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* other file descriptors that refer to the same file.
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*/
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{
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ret = _SS_ISCLOEXEC(psock->s_flags) ? FD_CLOEXEC : 0;
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}
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break;
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case F_SETFD:
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/* Set the file descriptor flags defined in <fcntl.h>, that are
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* associated with fd, to the third argument, arg, taken as type int.
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* If the FD_CLOEXEC flag in the third argument is 0, the file shall
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* remain open across the exec functions; otherwise, the file shall
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* be closed upon successful execution of one of the exec functions.
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*/
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{
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int oflags = va_arg(ap, int);
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if (oflags & ~FD_CLOEXEC)
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{
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ret = -ENOSYS;
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break;
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}
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if (oflags & FD_CLOEXEC)
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{
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psock->s_flags |= _SF_CLOEXEC;
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}
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else
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{
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psock->s_flags &= ~_SF_CLOEXEC;
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}
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ret = OK;
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}
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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
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* <fcntl.h>, for the file description associated with fd. The file
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* access modes can be extracted from the return value using the
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* mask O_ACCMODE, which is defined in <fcntl.h>. File status flags
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* and file access modes are associated with the file description
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* and do not affect other file descriptors that refer to the same
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* file with different open file descriptions.
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*/
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{
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sockcaps_t sockcaps;
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/* This summarizes the behavior of all NuttX sockets */
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ret = O_RDWR | O_SYNC | O_RSYNC;
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/* Unix domain sockets may be non-blocking. TCP/IP and UDP/IP
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* sockets may also be non-blocking if read-ahead is enabled
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*/
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DEBUGASSERT(psock->s_sockif != NULL &&
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psock->s_sockif->si_sockcaps != NULL);
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sockcaps = psock->s_sockif->si_sockcaps(psock);
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if ((sockcaps & SOCKCAP_NONBLOCKING) != 0 &&
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_SS_ISNONBLOCK(psock->s_flags))
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{
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ret |= O_NONBLOCK;
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}
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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
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* description associated with fd from the corresponding bits in
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* the third argument, arg, taken as type int. Bits corresponding
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* to the file access mode and the file creation flags, as defined
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* in <fcntl.h>, that are set in arg will be ignored. If any bits
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* in arg other than those mentioned here are changed by the
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* application, the result is unspecified.
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*/
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{
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/* Non-blocking is the only configurable option. And it applies
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* only Unix domain sockets and to read operations on TCP/IP
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* and UDP/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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sockcaps_t sockcaps;
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DEBUGASSERT(psock->s_sockif != NULL &&
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psock->s_sockif->si_sockcaps != NULL);
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sockcaps = psock->s_sockif->si_sockcaps(psock);
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if ((sockcaps & SOCKCAP_NONBLOCKING) != 0)
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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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ret = OK;
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}
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else
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{
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nerr("ERROR: Non-blocking not supported for this socket\n");
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ret = -ENOSYS;
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}
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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
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* specified to receive SIGURG signals when out-of-band data is
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* available. Positive values indicate a process ID; negative
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* values, other than -1, indicate a process group ID. If fd does
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* 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
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* specified to receive SIGURG signals when out-of-band data is
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* available, using the value of the third argument, arg, taken as
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* type int. Positive values indicate a process ID; negative values,
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* other than -1, indicate a process group ID. If fd does not refer
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* 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
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* by the third argument, arg, taken as a pointer to type struct
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* flock, defined in <fcntl.h>. The information retrieved shall
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* overwrite the information passed to fcntl() in the structure
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* flock. If no lock is found that would prevent this lock from
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* being created, then the structure shall be left unchanged except
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* for the lock type 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
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* description pointed to by the third argument, arg, taken as a
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* pointer to type struct flock, defined in <fcntl.h>. F_SETLK can
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* establish shared (or read) locks (F_RDLCK) or exclusive (or
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* write) locks (F_WRLCK), as well as to remove either type of
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* lock (F_UNLCK). F_RDLCK, F_WRLCK, and F_UNLCK are defined in
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* <fcntl.h>. If a shared or exclusive lock cannot be set, fcntl()
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* 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
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* shared or exclusive lock is blocked by other locks, the thread
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* shall wait until the request can be satisfied. If a signal that
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* is to be caught is received while fcntl() is waiting for a
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* region, fcntl() shall be interrupted. Upon return from the signal
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* handler, fcntl() shall return -1 with errno set to [EINTR], and
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* the lock operation shall not be done.
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*/
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ret = -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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break;
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}
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net_unlock();
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return ret;
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}
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/****************************************************************************
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* Name: psock_fcntl
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*
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* Description:
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* Similar to the standard fcntl function except that is accepts a struct
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* struct socket instance instead of a file descriptor.
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*
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* Input Parameters:
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* psock - An instance of the internal socket structure.
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* cmd - Identifies the operation to be performed. Command specific
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* arguments may follow.
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*
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* Returned Value:
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* The nature of the return value depends on the command. Non-negative
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* values indicate success. Failures are reported as negated errno
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* values.
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*
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****************************************************************************/
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int psock_fcntl(FAR struct socket *psock, int cmd, ...)
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{
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va_list ap;
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int ret;
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/* Setup to access the variable argument list */
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va_start(ap, cmd);
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/* Let psock_vfcntl() do the real work. The errno is not set on
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* failures.
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*/
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ret = psock_vfcntl(psock, cmd, ap);
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va_end(ap);
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return ret;
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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; a negated errno value is returned on
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* any failure to indicate the nature of the failure.
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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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return psock_vfcntl(sockfd_socket(sockfd), cmd, ap);
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}
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