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

   1 /* Copyright (C) 1997-2012 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 #include <bp-checks.h>
  29
  30 #include <kernel-features.h>
  31
  32 #ifdef __NR_pread64             /* Newer kernels renamed but it's the same.  */
  33 # ifdef __NR_pread
  34 #  error "__NR_pread and __NR_pread64 both defined???"
  35 # endif
  36 # define __NR_pread __NR_pread64
  37 #endif
  38
  39
  40 ssize_t
  41 __libc_pread64 (fd, buf, count, offset)
  42      int fd;
  43      void *buf;
  44      size_t count;
  45      off64_t offset;
  46 {
  47   ssize_t result;
  48
  49
  50   if (SINGLE_THREAD_P)
  51     {
  52 #if _MIPS_SIM == _ABIN32 || _MIPS_SIM == _ABI64
  53       result = INLINE_SYSCALL (pread, 4, fd, CHECK_N (buf, count), count,
  54                                offset);
  55 #else
  56      result = INLINE_SYSCALL (pread, 6, fd, CHECK_N (buf, count), count, 0,
  57                               __LONG_LONG_PAIR ((off_t) (offset >> 32),
  58                               (off_t) (offset & 0xffffffff)));
  59 #endif
  60      return result;
  61     }
  62
  63   int oldtype = LIBC_CANCEL_ASYNC ();
  64
  65 #if _MIPS_SIM == _ABIN32 || _MIPS_SIM == _ABI64
  66   result = INLINE_SYSCALL (pread, 4, fd, CHECK_N (buf, count), count, offset);
  67 #else
  68   result = INLINE_SYSCALL (pread, 6, fd, CHECK_N (buf, count), count, 0,
  69                            __LONG_LONG_PAIR ((off_t) (offset >> 32),
  70                                              (off_t) (offset & 0xffffffff)));
  71 #endif
  72
  73   LIBC_CANCEL_RESET (oldtype);
  74
  75   return result;
  76 }
  77
  78 weak_alias (__libc_pread64, __pread64)
  79 weak_alias (__libc_pread64, pread64)