about summary refs log tree commit diff
path: root/sysdeps/unix/sysv/linux/powerpc/truncate64.c
blob: 3f5c581444db2c75fb4e4a9adf84e6c3ac51ae13 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
/* Copyright (C) 1997, 1998, 1999, 2000, 2002 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#include <sys/types.h>
#include <errno.h>
#include <unistd.h>

#include <sysdep.h>
#include <sys/syscall.h>
#include <bp-checks.h>

#include "kernel-features.h"

#ifdef __NR_truncate64
#ifndef __ASSUME_TRUNCATE64_SYSCALL
/* The variable is shared between all wrappers around *truncate64 calls.  */
int have_no_truncate64;
#endif

extern int __syscall_truncate64 (const char *path, off64_t length);


/* Truncate the file FD refers to to LENGTH bytes.  */
int
truncate64 (path, length)
     const char *path;
     off64_t length;
{
#ifndef __ASSUME_TRUNCATE64_SYSCALL
  if (! have_no_truncate64)
#endif
    {
#ifndef __ASSUME_TRUNCATE64_SYSCALL
      int saved_errno = errno;
#endif
      int result = __syscall_truncate64 (CHECK_STRING (path), length);

#ifndef __ASSUME_TRUNCATE64_SYSCALL
      if (result != -1 || errno != ENOSYS)
#endif
	return result;

#ifndef __ASSUME_TRUNCATE64_SYSCALL
      __set_errno (saved_errno);
      have_no_truncate64 = 1;
#endif
    }

#ifndef __ASSUME_TRUNCATE64_SYSCALL
  if ((off_t) length != length)
    {
      __set_errno (EINVAL);
      return -1;
    }
  return truncate (path, (off_t) length);
#endif
}

#else
/* Use the generic implementation.  */
# include <sysdeps/generic/truncate64.c>
#endif