sysdeps/unix/sysv/linux/powerpc/powerpc32/ftruncate64.c

   1 /* Copyright (C) 1997-2002,2005,2006 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <sys/types.h>
  20 #include <errno.h>
  21 #include <unistd.h>
  22
  23 #include <sysdep.h>
  24 #include <sys/syscall.h>
  25
  26 #include <kernel-features.h>
  27
  28 #ifdef __NR_ftruncate64
  29 #ifndef __ASSUME_TRUNCATE64_SYSCALL
  30 /* The variable is shared between all wrappers around *truncate64 calls.  */
  31 extern int __have_no_truncate64;
  32 #endif
  33
  34
  35 /* Truncate the file FD refers to to LENGTH bytes.  */
  36 int
  37 __ftruncate64 (fd, length)
  38      int fd;
  39      off64_t length;
  40 {
  41 #ifndef __ASSUME_TRUNCATE64_SYSCALL
  42   if (! __have_no_truncate64)
  43 #endif
  44     {
  45 #ifndef __ASSUME_TRUNCATE64_SYSCALL
  46       int saved_errno = errno;
  47 #endif
  48       /* On PPC32 64bit values are aligned in odd/even register pairs.  */
  49       int result = INLINE_SYSCALL (ftruncate64, 4, fd, 0,
  50                                    (long) (length >> 32),
  51                                    (long) length);
  52
  53 #ifndef __ASSUME_TRUNCATE64_SYSCALL
  54       if (result != -1 || errno != ENOSYS)
  55 #endif
  56         return result;
  57
  58 #ifndef __ASSUME_TRUNCATE64_SYSCALL
  59       __set_errno (saved_errno);
  60       __have_no_truncate64 = 1;
  61 #endif
  62     }
  63
  64 #ifndef __ASSUME_TRUNCATE64_SYSCALL
  65   if ((off_t) length != length)
  66     {
  67       __set_errno (EINVAL);
  68       return -1;
  69     }
  70   return __ftruncate (fd, (off_t) length);
  71 #endif
  72 }
  73 weak_alias (__ftruncate64, ftruncate64)
  74
  75 #else
  76 /* Use the generic implementation.  */
  77 # include <misc/ftruncate64.c>
  78 #endif