ports/sysdeps/unix/sysv/linux/generic/wordsize-32/preadv.c

   1 /* Copyright (C) 2011-2014 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011.
   4    Based on work contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library.  If not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <assert.h>
  21 #include <errno.h>
  22 #include <endian.h>
  23 #include <unistd.h>
  24 #include <sys/uio.h>
  25
  26 #include <sysdep-cancel.h>
  27 #include <sys/syscall.h>
  28
  29 #include <kernel-features.h>
  30
  31 static ssize_t
  32 do_preadv (int fd, const struct iovec *vector, int count, off_t offset)
  33 {
  34   assert (sizeof (offset) == 4);
  35   return INLINE_SYSCALL (preadv, __ALIGNMENT_COUNT (5, 6), fd,
  36                          vector, count, __ALIGNMENT_ARG
  37                          __LONG_LONG_PAIR (offset >> 31, offset));
  38 }
  39
  40 ssize_t
  41 __libc_preadv (int fd, const struct iovec *vector, int count, off_t offset)
  42 {
  43   if (SINGLE_THREAD_P)
  44     return do_preadv (fd, vector, count, offset);
  45
  46   int oldtype = LIBC_CANCEL_ASYNC ();
  47
  48   ssize_t result = do_preadv (fd, vector, count, offset);
  49
  50   LIBC_CANCEL_RESET (oldtype);
  51
  52   return result;
  53 }
  54 strong_alias (__libc_preadv, __preadv)
  55 weak_alias (__libc_preadv, preadv)