sysdeps/unix/sysv/linux/powerpc/powerpc32/pwrite.c

   1 /* Copyright (C) 1997,1998,1999,2000,2002,2003,2006
   2         Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    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, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #include <assert.h>
  22 #include <errno.h>
  23 #include <unistd.h>
  24
  25 #include <sysdep-cancel.h>
  26 #include <sys/syscall.h>
  27 #include <bp-checks.h>
  28
  29 #include <kernel-features.h>
  30
  31 #if defined __NR_pwrite || __ASSUME_PWRITE_SYSCALL > 0
  32
  33 # if __ASSUME_PWRITE_SYSCALL == 0
  34 static ssize_t __emulate_pwrite (int fd, const void *buf, size_t count,
  35                                  off_t offset) internal_function;
  36 # endif
  37
  38
  39 ssize_t
  40 __libc_pwrite (fd, buf, count, offset)
  41      int fd;
  42      const void *buf;
  43      size_t count;
  44      off_t offset;
  45 {
  46   ssize_t result;
  47
  48   if (SINGLE_THREAD_P)
  49     {
  50       /* On PPC32 64bit values are aligned in odd/even register pairs.  */
  51       result = INLINE_SYSCALL (pwrite, 6, fd, CHECK_N (buf, count), count,
  52                                0, offset >> 31, offset);
  53 # if __ASSUME_PWRITE_SYSCALL == 0
  54       if (result == -1 && errno == ENOSYS)
  55         /* No system call available.  Use the emulation.  */
  56         result = __emulate_pwrite (fd, buf, count, offset);
  57 # endif
  58
  59       return result;
  60     }
  61
  62   int oldtype = LIBC_CANCEL_ASYNC ();
  63
  64   /* On PPC32 64bit values are aligned in odd/even register pairs.  */
  65   result = INLINE_SYSCALL (pwrite, 6, fd, CHECK_N (buf, count), count,
  66                            0, offset >> 31, offset);
  67 # if __ASSUME_PWRITE_SYSCALL == 0
  68   if (result == -1 && errno == ENOSYS)
  69     /* No system call available.  Use the emulation.  */
  70     result = __emulate_pwrite (fd, buf, count, offset);
  71 # endif
  72
  73   LIBC_CANCEL_RESET (oldtype);
  74
  75   return result;
  76 }
  77
  78 strong_alias (__libc_pwrite, __pwrite)
  79 weak_alias (__libc_pwrite, pwrite)
  80
  81 # define __libc_pwrite(fd, buf, count, offset) \
  82      static internal_function __emulate_pwrite (fd, buf, count, offset)
  83 #endif
  84
  85 #if __ASSUME_PWRITE_SYSCALL == 0
  86 # include <sysdeps/posix/pwrite.c>
  87 #endif