ports/sysdeps/unix/sysv/linux/mips/pwrite.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 <assert.h>
  20 #include <errno.h>
  21 #ifndef NO_SGIDEFS_H
  22 #include <sgidefs.h>
  23 #endif
  24 #include <unistd.h>
  25 #include <endian.h>
  26
  27 #include <sysdep-cancel.h>
  28 #include <sys/syscall.h>
  29 #include <bp-checks.h>
  30
  31 #include <kernel-features.h>
  32
  33 #ifdef __NR_pwrite64            /* Newer kernels renamed but it's the same.  */
  34 # ifdef __NR_pwrite
  35 #  error "__NR_pwrite and __NR_pwrite64 both defined???"
  36 # endif
  37 # define __NR_pwrite __NR_pwrite64
  38 #endif
  39
  40
  41 ssize_t
  42 __libc_pwrite (fd, buf, count, offset)
  43      int fd;
  44      const void *buf;
  45      size_t count;
  46      off_t offset;
  47 {
  48   ssize_t result;
  49
  50 #if _MIPS_SIM != _ABI64
  51   assert (sizeof (offset) == 4);
  52 #endif
  53
  54   if (SINGLE_THREAD_P)
  55     {
  56 #if _MIPS_SIM == _ABIN32 || _MIPS_SIM == _ABI64
  57       result = INLINE_SYSCALL (pwrite, 4, fd, CHECK_N (buf, count), count,
  58                                offset);
  59 #else
  60       result = INLINE_SYSCALL (pwrite, 6, fd, CHECK_N (buf, count), count, 0,
  61                                __LONG_LONG_PAIR (offset >> 31, offset));
  62 #endif
  63       return result;
  64     }
  65
  66   int oldtype = LIBC_CANCEL_ASYNC ();
  67
  68 #if _MIPS_SIM == _ABIN32 || _MIPS_SIM == _ABI64
  69   result = INLINE_SYSCALL (pwrite, 4, fd, CHECK_N (buf, count), count, offset);
  70 #else
  71   result = INLINE_SYSCALL (pwrite, 6, fd, CHECK_N (buf, count), count, 0,
  72                            __LONG_LONG_PAIR (offset >> 31, offset));
  73 #endif
  74
  75   LIBC_CANCEL_RESET (oldtype);
  76
  77   return result;
  78 }
  79
  80 strong_alias (__libc_pwrite, __pwrite)
  81 weak_alias (__libc_pwrite, pwrite)