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

   1 /* Copyright (C) 1997-2015 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 <assert.h>
  20 #include <errno.h>
  21 #include <unistd.h>
  22
  23 #include <sysdep-cancel.h>
  24 #include <sys/syscall.h>
  25
  26 ssize_t
  27 __libc_pread (fd, buf, count, offset)
  28      int fd;
  29      void *buf;
  30      size_t count;
  31      off_t offset;
  32 {
  33   ssize_t result;
  34
  35   if (SINGLE_THREAD_P)
  36     {
  37       /* On PPC32 64bit values are aligned in odd/even register pairs.  */
  38       result = INLINE_SYSCALL (pread, 6, fd, buf, count,
  39                                0, offset >> 31, offset);
  40
  41       return result;
  42     }
  43
  44   int oldtype = LIBC_CANCEL_ASYNC ();
  45
  46   /* On PPC32 64bit values are aligned in odd/even register pairs.  */
  47   result = INLINE_SYSCALL (pread, 6, fd, buf, count,
  48                                0, offset >> 31, offset);
  49
  50   LIBC_CANCEL_RESET (oldtype);
  51
  52   return result;
  53 }
  54
  55 strong_alias (__libc_pread, __pread)
  56 weak_alias (__libc_pread, pread)