Hello!
I'm writting on random positions on a mapped file, but it seems that if I
seek past 2GB, write something, then seek to a lower position, I got a
segfault. Here is the code:
#include <iostream>
#include <fstream>
#include
#include
using namespace std;
using boost::iostreams::stream;
using boost::iostreams::mapped_file;
int main(int argc, char** argv)
{
const size_t GIGA = 1024l*1024l*1024l;
const size_t FILESIZE = 2l * GIGA + 10000;
ofstream block("file", ios::binary | ios::out);
assert(block.good());
block.seekp(FILESIZE);
block.write("", 1);
block.close();
mapped_file mappedFile("file");
stream file(mappedFile, ios::binary | ios::out);
assert(mappedFile.is_open());
char buffer[10] = {0};
cout << 0 << endl;
file.seekp(0);
file.write(buffer, 1);
cout << FILESIZE - 1 << endl;
file.seekp(FILESIZE - 1);
file.write(buffer, 1);
cout << 1 * GIGA << endl;
file.seekp(1 * GIGA);
file.write(buffer, 1);
return 0;
}
I compile and run on Ubuntu 14.10/amd64:
$ g++ example.cpp -lboost_iostreams
0
2147493647
Segmentation fault (core dumped)
I also get the same error on Windows 8/amd64.
What I'm doing wrong?
[]s, Narcélio.
Narcélio Filho