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

   1 /* Copyright (C) 1997-2015 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 #ifdef __NR_pwrite64            /* Newer kernels renamed but it's the same.  */
  27 # ifdef __NR_pwrite
  28 #  error "__NR_pwrite and __NR_pwrite64 both defined???"
  29 # endif
  30 # define __NR_pwrite __NR_pwrite64
  31 #endif
  32
  33
  34 ssize_t
  35 __libc_pwrite64 (int fd, const void *buf, size_t count, off64_t offset)
  36 {
  37   ssize_t result;
  38
  39   if (SINGLE_THREAD_P)
  40     {
  41      result = INLINE_SYSCALL (pwrite, 6, fd, buf, count, 0,
  42                               __LONG_LONG_PAIR ((off_t) (offset >> 32),
  43                              (off_t) (offset & 0xffffffff)));
  44
  45      return result;
  46     }
  47
  48   int oldtype = LIBC_CANCEL_ASYNC ();
  49
  50   result = INLINE_SYSCALL (pwrite, 6, fd, buf, count, 0,
  51                            __LONG_LONG_PAIR ((off_t) (offset >> 32),
  52                                              (off_t) (offset & 0xffffffff)));
  53
  54   LIBC_CANCEL_RESET (oldtype);
  55
  56   return result;
  57 }
  58
  59 weak_alias (__libc_pwrite64, __pwrite64)
  60 libc_hidden_weak (__pwrite64)
  61 weak_alias (__libc_pwrite64, pwrite64)