Browse Source
git-svn-id: https://nuttx.svn.sourceforge.net/svnroot/nuttx/trunk@5090 7fd9a85b-ad96-42d3-883c-3090e2eb8679sbg
patacongo
13 years ago
11 changed files with 429 additions and 6 deletions
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|
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/****************************************************************************
|
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* include/sys/sendfile.h |
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* |
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* Copyright (C) 2012 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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#ifndef __INCLUDE_SYS_SENDFILE_H |
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#define __INCLUDE_SYS_SENDFILE_H |
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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/types.h> |
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/****************************************************************************
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* Pre-Processor Definitions |
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****************************************************************************/ |
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/* Configuration ************************************************************/ |
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#ifndef CONFIG_LIB_SENDFILE_BUFSIZE |
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# define CONFIG_LIB_SENDFILE_BUFSIZE 512 |
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#endif |
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/****************************************************************************
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* Public Type Definitions |
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****************************************************************************/ |
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|
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/****************************************************************************
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* Public Function Prototypes |
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****************************************************************************/ |
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#undef EXTERN |
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#if defined(__cplusplus) |
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#define EXTERN extern "C" |
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extern "C" { |
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#else |
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#define EXTERN extern |
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#endif |
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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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* sendfile() basically just wraps a sequence of reads() and writes() |
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* to perform a copy. It serves a purpose in systems where there is |
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* a penalty for copies to between user and kernal space, but really |
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* nothing in NuttX but provide some Linux compatible (and adding |
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* another 'almost standard' interface).
|
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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 Parmeters: |
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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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EXTERN ssize_t sendfile (int outfd, int infd, FAR off_t *offset, size_t count); |
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#undef EXTERN |
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#if defined(__cplusplus) |
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} |
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#endif |
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#endif /* __INCLUDE_SYS_SENDFILE_H */ |
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Can't render this file because it has a wrong number of fields in line 2.
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/************************************************************************
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* lib/misc/lib_streamsem.c |
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* |
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* Copyright (C) 2007, 2009, 2011 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, |
||||
* 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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/************************************************************************
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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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#if CONFIG_NSOCKET_DESCRIPTORS > 0 || CONFIG_NFILE_DESCRIPTORS > 0 |
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/************************************************************************
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* Private types |
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************************************************************************/ |
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|
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/************************************************************************
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* Private Variables |
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************************************************************************/ |
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|
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/************************************************************************
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* Public Variables |
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************************************************************************/ |
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|
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/************************************************************************
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* Private Functions |
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************************************************************************/ |
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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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/************************************************************************
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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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* sendfile() basically just wraps a sequence of reads() and writes() |
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* to perform a copy. It serves a purpose in systems where there is |
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* a penalty for copies to between user and kernal space, but really |
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* nothing in NuttX but provide some Linux compatible (and adding |
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* another 'almost standard' interface).
|
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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 Parmeters: |
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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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|
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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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FAR uint8_t *iobuffer; |
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off_t startpos = 0; |
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ssize_t nbytesread; |
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ssize_t nbyteswritten; |
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size_t ntransferred; |
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bool endxfr; |
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/* Get the current file position. */ |
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if (offset) |
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{ |
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/* Use lseek to get the current position */ |
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startpos = lseek(infd, 0, SEEK_CUR); |
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if (startpos == (off_t)-1) |
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{ |
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return ERROR; |
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} |
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|
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/* Use lseek again to set the new position */ |
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if (lseek(infd, *offset, SEEK_SET) == (off_t)-1) |
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{ |
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return ERROR; |
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} |
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} |
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|
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/* Allocate an I/O buffer */ |
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iobuffer = (FAR void *)malloc(CONFIG_LIB_SENDFILE_BUFSIZE); |
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if (!iobuffer) |
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{ |
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set_errno(ENOMEM); |
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return ERROR; |
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} |
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|
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/* Now transfer 'count' bytes from the infd to the outfd */ |
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for (ntransferred = 0, endxfr = false; ntransferred < count && !endxfr; ) |
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{ |
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/* Loop until the read side of the transfer comes to some conclusion */ |
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do |
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{ |
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/* Read a buffer of data from the infd */ |
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nbytesread = read(infd, iobuffer, CONFIG_LIB_SENDFILE_BUFSIZE); |
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|
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/* Check for end of file */ |
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if (nbytesread == 0) |
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{ |
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/* End of file. Break out and return current number of bytes
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* transferred. |
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*/ |
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endxfr = true; |
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break; |
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} |
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|
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/* Check for a read ERROR. EINTR is a special case. This function
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* should break out and return an error if EINTR is returned and |
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* no data has been transferred. But what should it do if some |
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* data has been transferred? I suppose just continue? |
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*/ |
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else if (nbytesread < 0) |
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{ |
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/* EINTR is not an error (but will still stop the copy) */ |
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#ifndef CONFIG_DISABLE_SIGNALS |
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if (errno != EINTR || ntransferred == 0) |
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#endif |
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{ |
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/* Read error. Break out and return the error condition. */ |
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ntransferred = ERROR; |
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endxfr = true; |
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break; |
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} |
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} |
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} |
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while (nbytesread < 0); |
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/* Was anything read? */ |
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if (!endxfr) |
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{ |
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/* Yes.. Loop until the read side of the transfer comes to some
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* conclusion. |
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*/ |
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do |
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{ |
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nbyteswritten = write(outfd, iobuffer, nbytesread); |
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/* Check for a complete (or parial write) */ |
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if (nbyteswritten >= 0) |
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{ |
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nbytesread -= nbyteswritten; |
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} |
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/* Otherwise an error occurred (write should not return zero) */ |
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else |
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{ |
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/* Check for a read ERROR. EINTR is a special case. This
|
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* function should break out and return an error if EINTR |
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* is returned and no data has been transferred. But what |
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* should it do if some data has been transferred? I |
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* suppose just continue? |
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*/ |
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|
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#ifndef CONFIG_DISABLE_SIGNALS |
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if (errno != EINTR || ntransferred == 0) |
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#endif |
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{ |
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/* Write error. Break out and return the error condition */ |
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ntransferred = ERROR; |
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endxfr = true; |
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break; |
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} |
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} |
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} |
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while (nbytesread > 0); |
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} |
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} |
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/* Release the I/O buffer */ |
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free(iobuffer); |
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/* Get the current file position */ |
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|
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if (offset) |
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{ |
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/* Use lseek to get the current position */ |
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|
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off_t curpos = lseek(infd, 0, SEEK_CUR); |
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if (curpos == (off_t)-1) |
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{ |
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return ERROR; |
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} |
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/* Return the current file position */ |
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*offset = curpos; |
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/* Use lseek again to restore the original position */ |
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if (lseek(infd, startpos, SEEK_SET) == (off_t)-1) |
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{ |
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return ERROR; |
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} |
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} |
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return ntransferred; |
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} |
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#endif /* CONFIG_NSOCKET_DESCRIPTORS > 0 || CONFIG_NFILE_DESCRIPTORS > 0 */ |
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