diff options
Diffstat (limited to 'nuttx/libc/misc/lib_sendfile.c')
| -rw-r--r-- | nuttx/libc/misc/lib_sendfile.c | 297 |
1 files changed, 0 insertions, 297 deletions
diff --git a/nuttx/libc/misc/lib_sendfile.c b/nuttx/libc/misc/lib_sendfile.c deleted file mode 100644 index 8a38dc317..000000000 --- a/nuttx/libc/misc/lib_sendfile.c +++ /dev/null @@ -1,297 +0,0 @@ -/************************************************************************ - * libc/misc/lib_streamsem.c - * - * Copyright (C) 2007, 2009, 2011 Gregory Nutt. All rights reserved. - * Author: Gregory Nutt <gnutt@nuttx.org> - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in - * the documentation and/or other materials provided with the - * distribution. - * 3. Neither the name NuttX nor the names of its contributors may be - * used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS - * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE - * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, - * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, - * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS - * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED - * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN - * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE - * POSSIBILITY OF SUCH DAMAGE. - * - ************************************************************************/ - -/************************************************************************ - * Included Files - ************************************************************************/ - -#include <nuttx/config.h> - -#include <sys/sendfile.h> -#include <stdbool.h> -#include <stdlib.h> -#include <unistd.h> -#include <errno.h> - -#if CONFIG_NSOCKET_DESCRIPTORS > 0 || CONFIG_NFILE_DESCRIPTORS > 0 - -/************************************************************************ - * Private types - ************************************************************************/ - -/************************************************************************ - * Private Variables - ************************************************************************/ - -/************************************************************************ - * Public Variables - ************************************************************************/ - -/************************************************************************ - * Private Functions - ************************************************************************/ - -/************************************************************************ - * Public Functions - ************************************************************************/ - -/************************************************************************ - * 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 kernal 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 Parmeters: - * 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, off_t *offset, size_t count) -{ - FAR uint8_t *iobuffer; - FAR uint8_t *wrbuffer; - off_t startpos = 0; - ssize_t nbytesread; - ssize_t nbyteswritten; - size_t ntransferred; - bool endxfr; - - /* Get the current file position. */ - - if (offset) - { - /* Use lseek to get the current file position */ - - startpos = lseek(infd, 0, SEEK_CUR); - if (startpos == (off_t)-1) - { - return ERROR; - } - - /* Use lseek again to set the new file position */ - - if (lseek(infd, *offset, SEEK_SET) == (off_t)-1) - { - return ERROR; - } - } - - /* Allocate an I/O buffer */ - - iobuffer = (FAR void *)malloc(CONFIG_LIB_SENDFILE_BUFSIZE); - if (!iobuffer) - { - set_errno(ENOMEM); - return ERROR; - } - - /* Now transfer 'count' bytes from the infd to the outfd */ - - for (ntransferred = 0, endxfr = false; ntransferred < count && !endxfr; ) - { - /* Loop until the read side of the transfer comes to some conclusion */ - - do - { - /* Read a buffer of data from the infd */ - - nbytesread = read(infd, iobuffer, CONFIG_LIB_SENDFILE_BUFSIZE); - - /* Check for end of file */ - - if (nbytesread == 0) - { - /* End of file. Break out and return current number of bytes - * transferred. - */ - - endxfr = true; - break; - } - - /* Check for a read ERROR. EINTR is a special case. This function - * should break out and return an error if EINTR is returned and - * no data has been transferred. But what should it do if some - * data has been transferred? I suppose just continue? - */ - - else if (nbytesread < 0) - { - /* EINTR is not an error (but will still stop the copy) */ - -#ifndef CONFIG_DISABLE_SIGNALS - if (errno != EINTR || ntransferred == 0) -#endif - { - /* Read error. Break out and return the error condition. */ - - ntransferred = ERROR; - endxfr = true; - break; - } - } - } - while (nbytesread < 0); - - /* Was anything read? */ - - if (!endxfr) - { - /* Yes.. Loop until the read side of the transfer comes to some - * conclusion. - */ - - wrbuffer = iobuffer; - do - { - /* Write the buffer of data to the outfd */ - - nbyteswritten = write(outfd, wrbuffer, nbytesread); - - /* Check for a complete (or parial) write. write() should not - * return zero. - */ - - if (nbyteswritten >= 0) - { - /* Advance the buffer pointer and decrement the number of bytes - * remaining in the iobuffer. Typically, nbytesread will now - * be zero. - */ - - wrbuffer += nbyteswritten; - nbytesread -= nbyteswritten; - - /* Increment the total number of bytes successfully transferred. */ - - ntransferred += nbyteswritten; - } - - /* Otherwise an error occurred */ - - else - { - /* Check for a read ERROR. EINTR is a special case. This - * function should break out and return an error if EINTR - * is returned and no data has been transferred. But what - * should it do if some data has been transferred? I - * suppose just continue? - */ - -#ifndef CONFIG_DISABLE_SIGNALS - if (errno != EINTR || ntransferred == 0) -#endif - { - /* Write error. Break out and return the error condition */ - - ntransferred = ERROR; - endxfr = true; - break; - } - } - } - while (nbytesread > 0); - } - } - - /* Release the I/O buffer */ - - free(iobuffer); - - /* Return the current file position */ - - if (offset) - { - /* Use lseek to get the current file position */ - - off_t curpos = lseek(infd, 0, SEEK_CUR); - if (curpos == (off_t)-1) - { - return ERROR; - } - - /* Return the current file position */ - - *offset = curpos; - - /* Use lseek again to restore the original file position */ - - if (lseek(infd, startpos, SEEK_SET) == (off_t)-1) - { - return ERROR; - } - } - - /* Finally return the number of bytes actually transferred (or ERROR - * if any failure occurred). - */ - - return ntransferred; -} - -#endif /* CONFIG_NSOCKET_DESCRIPTORS > 0 || CONFIG_NFILE_DESCRIPTORS > 0 */ |