254 lines
8.8 KiB
C
254 lines
8.8 KiB
C
/****************************************************************************
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* net/socket/net_vfcntl.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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_conn == NULL)
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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_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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