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) Either this is a bug in the ubuntu buildsystem, or my build system is broken. Can anyone with a 64 try to run the above program. Thanks 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
read.cpp
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