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Description of problem:
The STL filestreams (std::[io]fstream) supplied with the libstdc++
3.2.3 rpm on RedHat Enterprise Linux 3 seem to lack support for
opening files that are bigger than 2 GB.
The following test program deomonstrates this issue.
It opens a 2500MB file, once using std::ifstream::open() and another
time using the C library open() system call.
std::ifstream test( "2500MB.bin" );
if( !test.is_open() )
std::cout << "Open via ifstream::open() failed!" << std::endl;
if( ::open( "2500MB.bin", O_RDONLY ) == -1 )
std::cout << "Open via C open() failed!" << std::endl;
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Compile test program: g++ -D_FILE_OFFSET_BITS=64
2. Create a file > 2GB: dd if=/dev/zero of=2500MB.bin bs=1M count=2500
on an ext3 partition
3. Call the testprogram in the directory the file was created: ./a.out
Actual Results: std::ifstream::open() fails, C lib open() succeeds.
Expected Results: Both open() calls succeed.
Curiously, when using std::ifstream::open() on the 2500MB file on a
reiserfs partition it succeeds. I don't know if this is a Bug or a
feature of that filesystem.
Note that the C open() also succeeds when adding the O_LARGEFILE flag
and compiling the test program without the defines.
Internal RFE bug #117336 entered.
This will be fixed in RHEL4. It is not suitable for RHEL3, as it
needs to maintain libstdc++ ABI compatibility.