sysdeps/unix/sysv/linux/mips/pread64.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 <errno.h>
  20 #ifndef NO_SGIDEFS_H
  21 #include <sgidefs.h>
  22 #endif
  23 #include <unistd.h>
  24 #include <endian.h>
  25
  26 #include <sysdep-cancel.h>
  27 #include <sys/syscall.h>
  28
  29 #ifdef __NR_pread64             /* Newer kernels renamed but it's the same.  */
  30 # ifdef __NR_pread
  31 #  error "__NR_pread and __NR_pread64 both defined???"
  32 # endif
  33 # define __NR_pread __NR_pread64
  34 #endif
  35
  36
  37 ssize_t
  38 __libc_pread64 (int fd, void *buf, size_t count, off64_t offset)
  39 {
  40   ssize_t result;
  41
  42
  43   if (SINGLE_THREAD_P)
  44     {
  45 #if _MIPS_SIM == _ABIN32 || _MIPS_SIM == _ABI64
  46       result = INLINE_SYSCALL (pread, 4, fd, buf, count, offset);
  47 #else
  48      result = INLINE_SYSCALL (pread, 6, fd, buf, count, 0,
  49                               __LONG_LONG_PAIR ((off_t) (offset >> 32),
  50                               (off_t) (offset & 0xffffffff)));
  51 #endif
  52      return result;
  53     }
  54
  55   int oldtype = LIBC_CANCEL_ASYNC ();
  56
  57 #if _MIPS_SIM == _ABIN32 || _MIPS_SIM == _ABI64
  58   result = INLINE_SYSCALL (pread, 4, fd, buf, count, offset);
  59 #else
  60   result = INLINE_SYSCALL (pread, 6, fd, buf, count, 0,
  61                            __LONG_LONG_PAIR ((off_t) (offset >> 32),
  62                                              (off_t) (offset & 0xffffffff)));
  63 #endif
  64
  65   LIBC_CANCEL_RESET (oldtype);
  66
  67   return result;
  68 }
  69
  70 weak_alias (__libc_pread64, __pread64)
  71 weak_alias (__libc_pread64, pread64)