ports/sysdeps/unix/sysv/linux/mips/pread64.c

   1 /* Copyright (C) 1997-2014 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 #include <kernel-features.h>
  30
  31 #ifdef __NR_pread64             /* Newer kernels renamed but it's the same.  */
  32 # ifdef __NR_pread
  33 #  error "__NR_pread and __NR_pread64 both defined???"
  34 # endif
  35 # define __NR_pread __NR_pread64
  36 #endif
  37
  38
  39 ssize_t
  40 __libc_pread64 (fd, buf, count, offset)
  41      int fd;
  42      void *buf;
  43      size_t count;
  44      off64_t offset;
  45 {
  46   ssize_t result;
  47
  48
  49   if (SINGLE_THREAD_P)
  50     {
  51 #if _MIPS_SIM == _ABIN32 || _MIPS_SIM == _ABI64
  52       result = INLINE_SYSCALL (pread, 4, fd, buf, count, offset);
  53 #else
  54      result = INLINE_SYSCALL (pread, 6, fd, buf, count, 0,
  55                               __LONG_LONG_PAIR ((off_t) (offset >> 32),
  56                               (off_t) (offset & 0xffffffff)));
  57 #endif
  58      return result;
  59     }
  60
  61   int oldtype = LIBC_CANCEL_ASYNC ();
  62
  63 #if _MIPS_SIM == _ABIN32 || _MIPS_SIM == _ABI64
  64   result = INLINE_SYSCALL (pread, 4, fd, buf, count, offset);
  65 #else
  66   result = INLINE_SYSCALL (pread, 6, fd, buf, count, 0,
  67                            __LONG_LONG_PAIR ((off_t) (offset >> 32),
  68                                              (off_t) (offset & 0xffffffff)));
  69 #endif
  70
  71   LIBC_CANCEL_RESET (oldtype);
  72
  73   return result;
  74 }
  75
  76 weak_alias (__libc_pread64, __pread64)
  77 weak_alias (__libc_pread64, pread64)