sysdeps/unix/sysv/linux/generic/wordsize-32/pwrite64.c

   1 /* Copyright (C) 2011-2015 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011.
   4    Based on work contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library.  If not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <errno.h>
  21 #include <endian.h>
  22 #include <unistd.h>
  23
  24 #include <sysdep-cancel.h>
  25 #include <sys/syscall.h>
  26
  27 static ssize_t
  28 do_pwrite64 (int fd, const void *buf, size_t count, off64_t offset)
  29 {
  30   return INLINE_SYSCALL (pwrite64, __ALIGNMENT_COUNT (5, 6), fd,
  31                          buf, count, __ALIGNMENT_ARG
  32                          __LONG_LONG_PAIR ((off_t) (offset >> 32),
  33                                            (off_t) (offset & 0xffffffff)));
  34 }
  35
  36
  37 ssize_t
  38 __libc_pwrite64 (fd, buf, count, offset)
  39      int fd;
  40      const void *buf;
  41      size_t count;
  42      off64_t offset;
  43 {
  44   if (SINGLE_THREAD_P)
  45     return do_pwrite64 (fd, buf, count, offset);
  46
  47   int oldtype = LIBC_CANCEL_ASYNC ();
  48
  49   ssize_t result = do_pwrite64 (fd, buf, count, offset);
  50
  51   LIBC_CANCEL_RESET (oldtype);
  52
  53   return result;
  54 }
  55
  56 weak_alias (__libc_pwrite64, __pwrite64)
  57 libc_hidden_weak (__pwrite64) weak_alias (__libc_pwrite64, pwrite64)