sysdeps/unix/sysv/linux/powerpc/powerpc32/pread64.c

   1 /* Copyright (C) 1997-2013 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
   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, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <unistd.h>
  21
  22 #include <sysdep-cancel.h>
  23 #include <sys/syscall.h>
  24 #include <bp-checks.h>
  25
  26 #include <kernel-features.h>
  27
  28
  29 ssize_t
  30 __libc_pread64 (fd, buf, count, offset)
  31      int fd;
  32      void *buf;
  33      size_t count;
  34      off64_t offset;
  35 {
  36   ssize_t result;
  37
  38   if (SINGLE_THREAD_P)
  39     {
  40       /* On PPC32 64bit values are aligned in odd/even register pairs.  */
  41       result = INLINE_SYSCALL (pread, 6, fd, CHECK_N (buf, count), count,
  42                                0, (long) (offset >> 32),
  43                                (long) offset);
  44
  45       return result;
  46     }
  47
  48   int oldtype = LIBC_CANCEL_ASYNC ();
  49
  50   /* On PPC32 64bit values are aligned in odd/even register pairs.  */
  51   result = INLINE_SYSCALL (pread, 6, fd, CHECK_N (buf, count), count,
  52                            0, (long) (offset >> 32),
  53                            (long) offset);
  54
  55   LIBC_CANCEL_RESET (oldtype);
  56
  57   return result;
  58 }
  59
  60 weak_alias (__libc_pread64, __pread64)
  61 weak_alias (__libc_pread64, pread64)