io/sys/sendfile.h

   1 /* sendfile -- copy data directly from one file descriptor to another
   2    Copyright (C) 1998,99,01,2002,2004 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #ifndef _SYS_SENDFILE_H
  21 #define _SYS_SENDFILE_H 1
  22
  23 #include <features.h>
  24 #include <sys/types.h>
  25
  26 __BEGIN_DECLS
  27
  28 /* Send up to COUNT bytes from file associated with IN_FD starting at
  29    *OFFSET to descriptor OUT_FD.  Set *OFFSET to the IN_FD's file position
  30    following the read bytes.  If OFFSET is a null pointer, use the normal
  31    file position instead.  Return the number of written bytes, or -1 in
  32    case of error.  */
  33 #ifndef __USE_FILE_OFFSET64
  34 extern ssize_t sendfile (int __out_fd, int __in_fd, off_t *__offset,
  35                          size_t __count) __THROW;
  36 #else
  37 # ifdef __REDIRECT_NTH
  38 extern ssize_t __REDIRECT_NTH (sendfile,
  39                                (int __out_fd, int __in_fd, __off64_t *__offset,
  40                                 size_t __count), sendfile64);
  41 # else
  42 #  define sendfile sendfile64
  43 # endif
  44 #endif
  45 #ifdef __USE_LARGEFILE64
  46 extern ssize_t sendfile64 (int __out_fd, int __in_fd, __off64_t *__offset,
  47                            size_t __count) __THROW;
  48 #endif
  49
  50 __END_DECLS
  51
  52 #endif  /* sys/sendfile.h */