sysdeps/unix/sysv/linux/sh/pwrite64.c

   1 /* Copyright (C) 1997-2014 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ralf Baechle <ralf@gnu.org>, 1998.
   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 #include <unistd.h>
  21 #include <endian.h>
  22
  23 #include <sysdep-cancel.h>
  24 #include <sys/syscall.h>
  25
  26 #include <kernel-features.h>
  27
  28 #ifdef __NR_pwrite64            /* Newer kernels renamed but it's the same.  */
  29 # ifdef __NR_pwrite
  30 #  error "__NR_pwrite and __NR_pwrite64 both defined???"
  31 # endif
  32 # define __NR_pwrite __NR_pwrite64
  33 #endif
  34
  35
  36 ssize_t
  37 __libc_pwrite64 (fd, buf, count, offset)
  38      int fd;
  39      const void *buf;
  40      size_t count;
  41      off64_t offset;
  42 {
  43   ssize_t result;
  44
  45   if (SINGLE_THREAD_P)
  46     {
  47      result = INLINE_SYSCALL (pwrite, 6, fd, buf, count, 0,
  48                               __LONG_LONG_PAIR ((off_t) (offset >> 32),
  49                              (off_t) (offset & 0xffffffff)));
  50
  51      return result;
  52     }
  53
  54   int oldtype = LIBC_CANCEL_ASYNC ();
  55
  56   result = INLINE_SYSCALL (pwrite, 6, fd, buf, count, 0,
  57                            __LONG_LONG_PAIR ((off_t) (offset >> 32),
  58                                              (off_t) (offset & 0xffffffff)));
  59
  60   LIBC_CANCEL_RESET (oldtype);
  61
  62   return result;
  63 }
  64
  65 weak_alias (__libc_pwrite64, __pwrite64)
  66 libc_hidden_weak (__pwrite64)
  67 weak_alias (__libc_pwrite64, pwrite64)