138 lines
4.8 KiB
C
138 lines
4.8 KiB
C
/****************************************************************************
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* fs/vfs/fs_sendfile.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/sendfile.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <errno.h>
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#include <assert.h>
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#include <nuttx/sched.h>
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#include <nuttx/net/net.h>
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#ifdef CONFIG_NET_SENDFILE
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: sendfile
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*
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* Description:
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* sendfile() copies data between one file descriptor and another.
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* Used with file descriptors it basically just wraps a sequence of
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* reads() and writes() to perform a copy.
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*
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* If the destination descriptor is a socket, it gives a better
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* performance than simple reds() and writes(). The data is read directly
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* into the net buffer and the whole tcp window is filled if possible.
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*
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* NOTE: This interface is *not* specified in POSIX.1-2001, or other
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* standards. The implementation here is very similar to the Linux
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* sendfile interface. Other UNIX systems implement sendfile() with
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* different semantics and prototypes. sendfile() should not be used
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* in portable programs.
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*
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* Input Parameters:
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* infd - A file (or socket) descriptor opened for reading
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* outfd - A descriptor opened for writing.
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* offset - If 'offset' is not NULL, then it points to a variable
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* holding the file offset from which sendfile() will start
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* reading data from 'infd'. When sendfile() returns, this
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* variable will be set to the offset of the byte following
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* the last byte that was read. If 'offset' is not NULL,
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* then sendfile() does not modify the current file offset of
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* 'infd'; otherwise the current file offset is adjusted to
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* reflect the number of bytes read from 'infd.'
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*
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* If 'offset' is NULL, then data will be read from 'infd'
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* starting at the current file offset, and the file offset
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* will be updated by the call.
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* count - The number of bytes to copy between the file descriptors.
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*
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* Returned Value:
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* If the transfer was successful, the number of bytes written to outfd is
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* returned. On error, -1 is returned, and errno is set appropriately.
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* There error values are those returned by read() or write() plus:
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*
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* EINVAL - Bad input parameters.
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* ENOMEM - Could not allocated an I/O buffer
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*
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****************************************************************************/
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ssize_t sendfile(int outfd, int infd, off_t *offset, size_t count)
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{
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#ifdef CONFIG_NET_SENDFILE
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/* Check the destination file descriptor: Is it a (probable) file
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* descriptor? Check the source file: Is it a normal file?
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*/
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FAR struct socket *psock;
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psock = sockfd_socket(outfd);
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if (psock != NULL)
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{
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FAR struct file *filep;
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int ret;
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/* This appears to be a file-to-socket transfer. Get the file
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* structure.
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*/
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ret = fs_getfilep(infd, &filep);
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if (ret < 0)
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{
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set_errno(-ret);
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return ERROR;
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}
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DEBUGASSERT(filep != NULL);
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/* Then let psock_sendfile do the work. */
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ret = psock_sendfile(psock, filep, offset, count);
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if (ret >= 0 || get_errno() != ENOSYS)
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{
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return ret;
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}
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/* Fall back to the slow path if errno equals ENOSYS,
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* because psock_sendfile fail to optimize this transfer.
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*/
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}
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#endif
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/* No... then this is probably a file-to-file transfer. The generic
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* lib_sendfile() can handle that case.
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*/
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return lib_sendfile(outfd, infd, offset, count);
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}
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#endif /* CONFIG_NET_SENDFILE */
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