sysdeps/unix/sysv/linux/arm/pread64.c

   1 /* Copyright (C) 1997, 1998, 1999, 2000, 2002, 2003, 2005
   2    Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    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 <errno.h>
  21 #include <endian.h>
  22 #include <unistd.h>
  23
  24 #include <sysdep-cancel.h>
  25 #include <sys/syscall.h>
  26 #include <bp-checks.h>
  27
  28 ssize_t
  29 __libc_pread64 (fd, buf, count, offset)
  30      int fd;
  31      void *buf;
  32      size_t count;
  33      off64_t offset;
  34 {
  35   ssize_t result;
  36
  37   if (SINGLE_THREAD_P)
  38     {
  39       /* In the ARM EABI, 64-bit values are aligned to even/odd register
  40          pairs for syscalls.  */
  41       result = INLINE_SYSCALL (pread64, 6, fd, CHECK_N (buf, count), count, 0,
  42                                __LONG_LONG_PAIR ((off_t) (offset >> 32),
  43                                                  (off_t) (offset & 0xffffffff)));
  44
  45       return result;
  46     }
  47
  48   int oldtype = LIBC_CANCEL_ASYNC ();
  49
  50   /* In the ARM EABI, 64-bit values are aligned to even/odd register
  51      pairs for syscalls.  */
  52   result = INLINE_SYSCALL (pread64, 6, fd, CHECK_N (buf, count), count, 0,
  53                            __LONG_LONG_PAIR ((off_t) (offset >> 32),
  54                                              (off_t) (offset & 0xffffffff)));
  55
  56   LIBC_CANCEL_RESET (oldtype);
  57
  58   return result;
  59 }
  60
  61 weak_alias (__libc_pread64, __pread64)
  62 weak_alias (__libc_pread64, pread64)