xrootd/XrdOuc/XrdOucSFVec.hh

0001 #ifndef __OUC_SFVEC_H__
0002 #define __OUC_SFVEC_H__
0003 /******************************************************************************/
0004 /*                                                                            */
0005 /*                        X r d O u c S F V e c . h h                         */
0006 /*                                                                            */
0007 /* (c) 2013 by the Board of Trustees of the Leland Stanford, Jr., University  */
0008 /*   Produced by Andrew Hanushevsky for Stanford University under contract    */
0009 /*              DE-AC02-76-SFO0515 with the Department of Energy              */
0010 /*                                                                            */
0011 /* This file is part of the XRootD software suite.                            */
0012 /*                                                                            */
0013 /* XRootD is free software: you can redistribute it and/or modify it under    */
0014 /* the terms of the GNU Lesser General Public License as published by the     */
0015 /* Free Software Foundation, either version 3 of the License, or (at your     */
0016 /* option) any later version.                                                 */
0017 /*                                                                            */
0018 /* XRootD is distributed in the hope that it will be useful, but WITHOUT      */
0019 /* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or      */
0020 /* FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public       */
0021 /* License for more details.                                                  */
0022 /*                                                                            */
0023 /* You should have received a copy of the GNU Lesser General Public License   */
0024 /* along with XRootD in a file called COPYING.LESSER (LGPL license) and file  */
0025 /* COPYING (GPL license).  If not, see <http://www.gnu.org/licenses/>.        */
0026 /*                                                                            */
0027 /* The copyright holder's institutional names and contributor's names may not */
0028 /* be used to endorse or promote products derived from this software without  */
0029 /* specific prior written permission of the institution or contributor.       */
0030 /******************************************************************************/
0031
0032 #include <unistd.h>
0033
0034 //-----------------------------------------------------------------------------
0035 //! XrdOucSFVec
0036 //!
0037 //! The struct defined here is a generic data structure that is used whenever
0038 //! we need to pass a vector of file offsets, lengths, and the corresponding
0039 //! target buffer pointers to effect a sendfile() call. It is used by the
0040 //! xrd, sfs, ofs., and oss components.
0041 //-----------------------------------------------------------------------------
0042
0043 struct XrdOucSFVec {union {char *buffer;    //!< ->Data if fdnum < 0
0044                            off_t offset;    //!< File offset of data otherwise
0045                           };
0046                     int   sendsz;           //!< Length of data at offset
0047                     int   fdnum;            //!< File descriptor for data
0048
0049                     enum {sfMax = 16};      //!< Maximum number of elements
0050                    };
0051 #endif