lib/copy-file-range.c

   1 /* Stub for copy_file_range
   2    Copyright 2019-2021 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  16
  17 #include <config.h>
  18
  19 #include <unistd.h>
  20
  21 #include <errno.h>
  22
  23 ssize_t
  24 copy_file_range (int infd, off_t *pinoff,
  25                  int outfd, off_t *poutoff,
  26                  size_t length, unsigned int flags)
  27 {
  28   /* There is little need to emulate copy_file_range with read+write,
  29      since programs that use copy_file_range must fall back on
  30      read+write anyway.  */
  31   errno = ENOSYS;
  32   return -1;
  33 }