115 lines
4.5 KiB
C
115 lines
4.5 KiB
C
/****************************************************************************
|
|
* include/sys/sendfile.h
|
|
*
|
|
* Licensed to the Apache Software Foundation (ASF) under one or more
|
|
* contributor license agreements. See the NOTICE file distributed with
|
|
* this work for additional information regarding copyright ownership. The
|
|
* ASF licenses this file to you under the Apache License, Version 2.0 (the
|
|
* "License"); you may not use this file except in compliance with the
|
|
* License. You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
* License for the specific language governing permissions and limitations
|
|
* under the License.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifndef __INCLUDE_SYS_SENDFILE_H
|
|
#define __INCLUDE_SYS_SENDFILE_H
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <sys/types.h>
|
|
|
|
/****************************************************************************
|
|
* Pre-processor Definitions
|
|
****************************************************************************/
|
|
|
|
/* Configuration ************************************************************/
|
|
|
|
#ifndef CONFIG_SENDFILE_BUFSIZE
|
|
# define CONFIG_SENDFILE_BUFSIZE 512
|
|
#endif
|
|
|
|
#if defined(CONFIG_FS_LARGEFILE) && defined(CONFIG_HAVE_LONG_LONG)
|
|
# define sendfile64 sendfile
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Public Type Definitions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Public Function Prototypes
|
|
****************************************************************************/
|
|
|
|
#undef EXTERN
|
|
#if defined(__cplusplus)
|
|
#define EXTERN extern "C"
|
|
extern "C"
|
|
{
|
|
#else
|
|
#define EXTERN extern
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Name: sendfile
|
|
*
|
|
* Description:
|
|
* sendfile() copies data between one file descriptor and another.
|
|
* sendfile() basically just wraps a sequence of reads() and writes()
|
|
* to perform a copy. It serves a purpose in systems where there is
|
|
* a penalty for copies to between user and kernel space, but really
|
|
* nothing in NuttX but provide some Linux compatible (and adding
|
|
* another 'almost standard' interface).
|
|
*
|
|
* NOTE: This interface is *not* specified in POSIX.1-2001, or other
|
|
* standards. The implementation here is very similar to the Linux
|
|
* sendfile interface. Other UNIX systems implement sendfile() with
|
|
* different semantics and prototypes. sendfile() should not be used
|
|
* in portable programs.
|
|
*
|
|
* Input Parameters:
|
|
* infd - A file (or socket) descriptor opened for reading
|
|
* outfd - A descriptor opened for writing.
|
|
* offset - If 'offset' is not NULL, then it points to a variable
|
|
* holding the file offset from which sendfile() will start
|
|
* reading data from 'infd'. When sendfile() returns, this
|
|
* variable will be set to the offset of the byte following
|
|
* the last byte that was read. If 'offset' is not NULL,
|
|
* then sendfile() does not modify the current file offset of
|
|
* 'infd'; otherwise the current file offset is adjusted to
|
|
* reflect the number of bytes read from 'infd.'
|
|
*
|
|
* If 'offset' is NULL, then data will be read from 'infd'
|
|
* starting at the current file offset, and the file offset
|
|
* will be updated by the call.
|
|
* count - The number of bytes to copy between the file descriptors.
|
|
*
|
|
* Returned Value:
|
|
* If the transfer was successful, the number of bytes written to outfd is
|
|
* returned. On error, -1 is returned, and errno is set appropriately.
|
|
* There error values are those returned by read() or write() plus:
|
|
*
|
|
* EINVAL - Bad input parameters.
|
|
* ENOMEM - Could not allocated an I/O buffer
|
|
*
|
|
****************************************************************************/
|
|
|
|
ssize_t sendfile(int outfd, int infd, FAR off_t *offset, size_t count);
|
|
|
|
#undef EXTERN
|
|
#if defined(__cplusplus)
|
|
}
|
|
#endif
|
|
|
|
#endif /* __INCLUDE_SYS_SENDFILE_H */
|