mmap64失败

[__Silent]

由于需要对大地址空间操作，需要使用mmap64这样函数，
下面这句代码，执行时候错误信息是Invalid argument。
mmap64(NULL, 32768, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 4 * 4096);

如果把mmap64换成mmap函数，就能正常映射。
mmap(NULL, 32768, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 4 * 4096);

求指导，谢谢！！！！！1

[夏天__]

看一下源码：

01	/** Copyright (C) 1997 Free Software Foundation, Inc.
02	   This file is part of the GNU C Library.
03	 
04	   The GNU C Library is free software; you can redistribute it and/or
05	   modify it under the terms of the GNU Lesser General Public
06	   License as published by the Free Software Foundation; either
07	   version 2.1 of the License, or (at your option) any later version.
08	 
09	   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 <errno.h>
20	#include <sys/mman.h>
21	#include <sys/types.h>
22	 
23	/** Map addresses starting near ADDR and extending for LEN bytes.  From
24	   OFFSET into the file FD describes according to PROT and FLAGS.  If ADDR
25	   is nonzero, it is the desired mapping address.  If the MAP_FIXED bit is
26	   set in FLAGS, the mapping will be at ADDR exactly (which must be
27	   page-aligned); otherwise the system chooses a convenient nearby address.
28	   The return value is the actual mapping address chosen or MAP_FAILED
29	   for errors (in which case `errno' is set).  A successful `mmap' call
30	   deallocates any previous mapping for the affected region.  */
31	 
32	__ptr_t
33	__mmap64 (__ptr_t addr, size_t len, int prot, int flags, int fd,
34	      __off64_t offset)
35	{
36	  off_t small_offset = (off_t) offset;
37	 
38	  if (small_offset != offset)
39	    {
40	      /** We cannot do this since the offset is too large.  */
41	      __set_errno (EOVERFLOW);
42	      return MAP_FAILED;
43	    }
44	 
45	  return __mmap (addr, len, prot, flags, fd, small_offset);
46	}
47	 
48	weak_alias (__mmap64, mmap64)

[__Silent]

呵呵 看过了，谢谢