read() wont allow me to read files larger than 2 gig (on a 64bit)

[glide creme]

Hi
Sorry if I'm asking on the wrong mailinglist,
but I've asked on various forums and I havn't found a solution.

I can't read files larger than 2 gig on my ubuntu64bit using 'read()',
the problem is not related to the allocation itself, which works.
Attached is a sample program that illustrates this.

I've tried with various, compiler flags like
-D_FILE_OFFSET_BITS=64

According to man 2 read, the maximum is limited by SSIZE_MAX
which is defined in

/usr/include/bits/posix1_lim.h
# define SSIZE_MAX LONG_MAX

And LONG_MAX is defined in /usr/include/limits.h as
# if __WORDSIZE == 64
# define LONG_MAX 9223372036854775807L
# else
# define LONG_MAX 2147483647L
# endif
# define LONG_MIN (-LONG_MAX - 1L)

Is this the expected behaviour for the read function on a 64bit platform,
or is something broken

Thanks in advance

edit:

by the way

readelf -h ./a.out
ELF Header:
  Magic:   7f 45 4c 46 02 01 01 00 00 00 00 00 00 00 00 00
  Class:                             ELF64
  Data:                              2's complement, little endian
  Version:                           1 (current)
  OS/ABI:                            UNIX - System V
  ABI Version:                       0
  Type:                              EXEC (Executable file)
  Machine:                           Advanced Micro Devices X86-64
  Version:                           0x1
  Entry point address:               0x400750
  Start of program headers:          64 (bytes into file)
  Start of section headers:          5312 (bytes into file)
  Flags:                             0x0
  Size of this header:               64 (bytes)
  Size of program headers:           56 (bytes)
  Number of program headers:         9
  Size of section headers:           64 (bytes)
  Number of section headers:         37
  Section header string table index: 34

ldd ./a.out
        linux-vdso.so.1 =>  (0x00007fff689ff000)
        libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0x00007ffee433e000)
        libm.so.6 => /lib/libm.so.6 (0x00007ffee40ba000)
        libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x00007ffee3ea3000)
        libc.so.6 => /lib/libc.so.6 (0x00007ffee3b34000)
        /lib64/ld-linux-x86-64.so.2 (0x00007ffee464e000)

uname -a
Linux csi 2.6.31-15-generic #50-Ubuntu SMP Tue Nov 10 14:53:52 UTC
2009 x86_64 GNU/Linux
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