Hi, I'm trying to use boost::iostreams for a project I'm writing and I have a problem: It seems that the destructor of boost::iostreams::streamboost::iostreams::file_descriptor_source closes the file descriptor. I really need to be able to close this file descriptor manually and I can't find any way to do it. Note that file_descriptor_source has a constructor parameter specifying if the descriptor should be closed in file_descriptor_source destructor or not. It perfectly works - it's boost::iostreams::stream destructor that forces closing the description, not file_descriptor_source destructor. A short code illustrating this problem (for Linux): --- 8< --- #include <iostream> #include #include #include <cstring> #include #include #include #include using namespace std; using namespace boost::iostreams; int main() { int fd = open("/etc/fstab", O_RDONLY); clog << "fd=" << fd << endl; { file_descriptor_source source(fd, false); stream strm(source); string s; strm >> s; clog << "first line: " << s << endl; } int closeRet = close(fd); int closeErrno = errno; clog << "closing result: " << closeRet << ", " << strerror(closeErrno) << endl; } --- 8< --- The behaviour I would expect is the close() at the end succeeding. However, it returns -1 with errno=EBADF. Is this the expected behaviour or a bug? TIA, Noix